CN106395385A - A diaphragm type pulverized coal pressurized conveying system and conveying method - Google Patents

Abstract

The invention discloses a diaphragm type pulverized coal pressurized conveying system and a diaphragm type pulverized coal pressurized conveying method, wherein the diaphragm type pulverized coal pressurized conveying system comprises a normal-pressure coal bunker, a high-pressure coal bunker, a first valve, a second valve and a conveying tank, wherein a diaphragm is arranged in the conveying tank, and the conveying tank is provided with a tank body; the diaphragm is provided with two communicating ports which are respectively communicated with the first valve and the second valve and divide the interior of the tank body into an inner membrane space surrounded by the diaphragm and an outer membrane space formed by the diaphragm and the tank body. The diaphragm type pulverized coal pressurized conveying system provided by the invention effectively solves the problems that in the prior art, a large amount of inert gas needs to be discharged, so that the environment pollution is large, the efficiency of the pressurized conveying process is low, continuous adjustability cannot be realized, the high-pressure-resistant equipment needs to be large in size, the manufacturing cost is high, and the like.

Description

A diaphragm type pulverized coal pressurized conveying system and conveying method

technical field

The invention relates to the field of pulverized coal pressure conveying, in particular to a diaphragm type pulverized coal pressure conveying system and a conveying method.

Background technique

In coal chemical industry, metallurgy, food processing and many other fields, the process of pressurized conveying of powder is involved. Coal gasification, especially pulverized coal pressurized gasification is a clean coal utilization technology, which has been developed rapidly in recent years and has been used more and more widely. Pulverized coal pressurized conveying technology is an indispensable technical link of pulverized coal pressurized gasification technology. Pulverized coal pressurized conveying technology is to increase dry coal powder from normal pressure to a specific high pressure, so as to realize the combustion and gasification of pulverized coal under high pressure.

The pulverized coal pressurized conveying technology currently used in industry is mainly lock bucket pressurized conveying. The coal is transported to the pulverized coal storage tank, the solid pulverized coal in the lock hopper is replaced with high-pressure inert gas, and then the high-pressure inert gas in the pulverized coal lock hopper is discharged, and the cycle is like this.

The technical defect that exists in the prior art has:

1. The pressurization process needs to discharge a large amount of inert gases such as N2, CO2, etc., causing greater environmental pollution;

2. The efficiency of the pressurized conveying process is low, and continuous adjustment cannot be realized;

3. Pressurized transportation requires high-pressure resistant equipment with large volume and high cost.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is how to solve the problems in the prior art that need to discharge a large amount of inert gas to cause greater environmental pollution, the process of pressurized conveying is inefficient and cannot be continuously adjusted, and the need for high-pressure-resistant equipment is large in volume and high in cost. .

(2) Technical solution

In order to achieve the above object, the present invention provides a diaphragm-type pulverized coal pressurized conveying system, which includes a normal-pressure coal bunker, a high-pressure coal bunker, a first valve, a second valve, and a delivery tank, and a diaphragm is arranged in the delivery tank. And has a tank body; the diaphragm has two communication ports, the communication ports communicate with the first valve and the second valve respectively, and separate the tank body into a membrane surrounded by the diaphragm space and the extramembrane space formed by the diaphragm and the tank body.

Preferably, the extramembrane space is airtight and does not communicate with the first valve and the second valve.

Preferably, the membrane is elastic.

Preferably, the volume of the extra-membrane space can change as the pressure changes, and the volume of the inner-membrane space also changes accordingly.

Preferably, the delivery tank has a hydraulic oil inlet located at the upper part of the tank body and a hydraulic oil outlet located at the lower part of the tank body.

Preferably, the hydraulic oil inlet and the hydraulic oil outlet communicate with the outer membrane space respectively.

Preferably, a hydraulic oil cylinder and a hydraulic pump are also included; the hydraulic oil outlet, the hydraulic oil cylinder, the hydraulic pump and the hydraulic oil inlet are connected in sequence.

The present invention also provides a diaphragm type pulverized coal pressurized conveying method, which is used in the above diaphragm type pulverized coal pressurized conveying system, and is implemented according to the following steps:

S00: Open the first valve, and transport the pulverized coal stored in the normal-pressure coal bunker to the inner membrane space of the delivery tank by gravity, and the inner membrane space is under normal pressure at this time;

S10: Close the first valve, open the second valve, the high-pressure gas in the high-pressure coal bunker presses the space inside the membrane, and the pulverized coal in the space inside the membrane enters the high-pressure gas under the action of gravity In the coal bunker, the space inside the membrane is filled with high-pressure gas at this time;

S20: Start the hydraulic pump, and the hydraulic pump pumps the hydraulic oil in the hydraulic cylinder into the extra-membrane space of the delivery tank through the hydraulic oil inlet, and the volume of the extra-membrane space becomes larger, so The diaphragm is deformed, and most of the high-pressure gas is squeezed and discharged into the high-pressure coal bunker as the space in the film becomes smaller;

S30: closing the second valve and the hydraulic pump, the residual high-pressure gas in the space inside the membrane expands, and presses the hydraulic oil in the space outside the membrane back into the hydraulic cylinder through the hydraulic oil outlet, At this time, the volume of the space inside the membrane becomes larger, the diaphragm deforms, and the volume of the space outside the membrane becomes smaller; and selectively

S40: Steps S00-S30 are repeated, and the cycle repeats.

When step S40 exists, the system realizes continuous operation.

(2) Beneficial effects

Compared with the present invention, there are significant advantages and beneficial effects:

1. Use a transport tank with a diaphragm and separate it into two chambers, and control the pulverized coal pressure by controlling the volume of the two chambers, without inert gas participating in the transportation;

2. Control the diaphragm shrinkage, expansion frequency, and valve switching frequency to control the feeding amount and realize continuous adjustment;

3. The transport tank with diaphragm is small in size and light in weight, and the system requires few devices.

Description of drawings

Fig. 1 is a flow chart of a diaphragm type pulverized coal pressurized conveying system provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the state before the hydraulic oil is filled in the delivery tank of a diaphragm type pulverized coal pressurized delivery system provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the state in the process of filling hydraulic oil in the conveying tank of a diaphragm type pulverized coal pressurized conveying system provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of the state of a diaphragm type pulverized coal pressurized conveying system provided by an embodiment of the present invention after the conveying tank is filled with hydraulic oil.

In the picture:

1. Atmospheric coal bunker; 2. Hydraulic cylinder; 3. Delivery tank; 4. High pressure coal bunker; 5. Hydraulic pump; 6. First valve; 7. Second valve; 3-1 Hydraulic oil inlet; 3-2 Hydraulic oil outlet; 3-3 tank; 3-4 diaphragm.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

As shown in Figures 1-4, a diaphragm-type pulverized coal pressurized conveying system provided by the present invention includes an atmospheric coal bunker 1, a high-pressure coal bunker 4, a first valve 6, a second valve 7, and a conveying tank 3. The delivery tank 3 communicates with the normal-pressure coal bunker 1 through the first valve 6 , and the delivery tank 3 communicates with the high-pressure coal bunker 4 through the second valve 7 .

Wherein, the conveying tank 3 is provided with a diaphragm 3-4, and has a tank body 3-3, and the diaphragm is arranged in the tank body 3-3; the diaphragm 3-4 has two communication ports, and the communication ports are respectively connected to the first valve 6, The second valve 7 communicates and separates the inside of the tank body 3-3 into an intramembrane space surrounded by the diaphragm 3-4 and an extramembrane space formed by the diaphragm 3-4 and the tank body 3-3. The outer space is isolated from each other; the outer space of the membrane is airtight and does not communicate with the first valve 6 and the second valve 7; the diaphragm 3-4 is elastic, and when the pressure of the inner space of the membrane and the outer space of the membrane changes, the diaphragm 3-4 Can change shape, the volume of the space outside the membrane can change with the change of pressure, and the volume of the space inside the membrane also changes accordingly.

Specifically, it also includes a hydraulic cylinder 2 and a hydraulic pump 4; the transfer tank 3 has a hydraulic oil inlet 3-1 located at the upper part of the tank body 3-3 and a hydraulic oil outlet 3-2 located at the lower part of the tank body 3-3.

Among them, the hydraulic oil inlet 3-1 and the hydraulic oil outlet 3-2 are respectively connected with the space outside the membrane; the hydraulic oil outlet 3-2, the hydraulic cylinder 2, the hydraulic pump 4 and the hydraulic oil inlet 3-1 are sequentially connected and stored in the hydraulic cylinder The hydraulic oil in 2 can be pumped into the extra-membrane space of the delivery tank 3 by the hydraulic pump 4 through the hydraulic oil inlet 3-1, and the hydraulic oil in the extra-membrane space can also be pressed into the hydraulic cylinder 2 through the hydraulic oil outlet 3-2 middle.

The conveying process of the conveying system will be described in detail below in conjunction with the diaphragm type pulverized coal pressurized conveying system in the embodiment of the present invention.

Open the first valve 6, and the pulverized coal stored in the normal-pressure coal bunker 1 is transported to the membrane inner space of the delivery tank 3 by gravity, and the membrane inner space is at normal pressure ;

Close the first valve 6, open the second valve 7, the high-pressure gas in the high-pressure coal bunker 4 punches the inner space of the membrane, and the pulverized coal in the inner space of the membrane enters the In the high-pressure coal bunker 4, the space in the membrane is filled with high-pressure gas at this time.

Start the hydraulic pump 4, and the hydraulic pump 4 pumps the hydraulic oil in the hydraulic cylinder 2 into the extra-membrane space of the delivery tank 3 through the hydraulic oil inlet 3-1, and the extra-membrane space As the volume becomes larger, the diaphragm 3-4 is deformed, and most of the high-pressure gas is squeezed and discharged into the high-pressure coal bunker 4 in the space inside the membrane as the volume becomes smaller.

Close the second valve 7, and close the hydraulic pump 4, the residual high-pressure gas in the space inside the membrane expands, and the hydraulic oil in the space outside the membrane is pressed back to the hydraulic pressure through the hydraulic oil outlet 3-2. In the oil cylinder 2, at this time, the volume of the space inside the membrane becomes larger, the diaphragm 3-4 is deformed, and the volume of the space outside the membrane becomes smaller.

Repeat the above, and the cycle repeats.

Example 2

As shown in Fig. 1, a kind of membrane type pulverized coal pressure conveying method provided by the present invention, the steps are as follows:

Open the first valve 6, and the pulverized coal stored in the normal-pressure coal bunker 1 is transported to the membrane inner space of the delivery tank 3 by gravity, and the membrane inner space is at normal pressure ;

Close the first valve 6, open the second valve 7, the high-pressure gas in the high-pressure coal bunker 4 punches the inner space of the membrane, and the pulverized coal in the inner space of the membrane enters the In the high-pressure coal bunker 4, at this moment, the space in the membrane is filled with high-pressure gas;

Start the hydraulic pump 4, and the hydraulic pump 4 pumps the hydraulic oil in the hydraulic cylinder 2 into the extra-membrane space of the delivery tank 3 through the hydraulic oil inlet 3-1, and the extra-membrane space When the volume becomes larger, the diaphragm 3-4 is deformed, and most of the high-pressure gas is squeezed and discharged into the high-pressure coal bunker 4 in the space inside the membrane as the volume becomes smaller;

Close the second valve 7, and close the hydraulic pump 4, the residual high-pressure gas in the space inside the membrane expands, and the hydraulic oil in the space outside the membrane is pressed back to the hydraulic pressure through the hydraulic oil outlet 3-2. In the oil cylinder 2, at this time, the volume of the space inside the membrane becomes larger, the diaphragm 3-4 is deformed, and the volume of the space outside the membrane becomes smaller;

Repeat the above, and the cycle repeats.

The whole process does not require inert gas to participate in the transportation, reducing air pollution, and achieves continuous control of the entire transportation system by controlling the opening and closing frequency of the valve.

The above are only some specific implementations of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. A diaphragm type pulverized coal pressurized conveying system comprises a normal pressure coal bunker (1), a high pressure coal bunker (4), a first valve (6), a second valve (7), and a delivery tank (3). Features: The delivery tank (3) is provided with a diaphragm (3-4) and has a tank body (3-3); The diaphragm (3-4) has two communication ports, the communication ports communicate with the first valve (6) and the second valve (7) respectively, and connect the tank body (3-3) The interior is divided into an inner membrane space surrounded by the membrane (3-4) and an outer membrane space formed by the membrane (3-4) and the tank body (3-3). 2. The diaphragm type pulverized coal pressurized conveying system according to claim 1, characterized in that: The extramembrane space is sealed and does not communicate with the first valve (6) and the second valve (7). 3. The diaphragm type pulverized coal pressurized conveying system according to claim 1, characterized in that: The diaphragm (3-4) has elasticity. 4. The diaphragm type pulverized coal pressurized conveying system according to claim 1, characterized in that: The volume of the extramembrane space can change as the pressure changes, and the volume of the intramembrane space also changes accordingly. 5. The diaphragm type pulverized coal pressurized conveying system according to claim 1, characterized in that: The transfer tank (3) has a hydraulic oil inlet (3-1) located at the upper part of the tank body (3-3) and a hydraulic oil outlet (3-2) located at the lower part of the tank body (3-3). 6. The diaphragm type pulverized coal pressurized conveying system according to claim 5, characterized in that: The hydraulic oil inlet (3-1) and the hydraulic oil outlet (3-2) communicate with the outer membrane space respectively. 7. The diaphragm type pulverized coal pressurized conveying system according to claim 6, characterized in that: It also includes a hydraulic cylinder (2) and a hydraulic pump (4); The hydraulic oil outlet (3-2), the hydraulic oil cylinder (2), the hydraulic pump (4) and the hydraulic oil inlet (3-1) are connected in sequence. 8. A diaphragm type pulverized coal pressurized conveying method for the diaphragm type pulverized coal pressurized conveying system according to any one of claims 1-7, characterized in that it comprises the following steps: S00: Open the first valve (6), and the pulverized coal stored in the atmospheric coal bunker (1) is transported to the inner membrane space of the delivery tank (3) by gravity. The space inside the membrane is under normal pressure; S10: Close the first valve (6), open the second valve (7), the high-pressure gas in the high-pressure coal bunker (4) punches the space inside the membrane, and the powder in the space inside the membrane Coal enters the high-pressure coal bunker (4) under the action of gravity, and at this time, the space in the membrane is filled with high-pressure gas; S20: Start the hydraulic pump (4), and the hydraulic pump (4) pumps the hydraulic oil in the hydraulic cylinder (2) into the delivery tank (3) through the hydraulic oil inlet (3-1) ), the volume of the extramembrane space becomes larger, the diaphragm (3-4) deforms, and the inner space of the membrane squeezes most of the high-pressure gas and discharges it into the high-pressure space as the volume becomes smaller. In the coal bunker (4); S30: Close the second valve (7), and close the hydraulic pump (4), the residual high-pressure gas in the space inside the membrane expands, and the hydraulic oil in the space outside the membrane passes through the hydraulic oil outlet (3 -2) press back into the hydraulic cylinder (2), at this time the volume of the space inside the membrane becomes larger, the diaphragm (3-4) deforms, and the volume of the space outside the membrane becomes smaller; and optionally S40: Steps S00-S30 are repeated, and the cycle repeats.