JPH02242009A - Gas supply facilities - Google Patents

Abstract

PURPOSE:To sufficiently suppress the pressure variation on the downstream side of a self-operated pressure regulator by operating a self-operated pressure regulator automatically to the direction of valve opening or valve closing forcibly only for a specified time by the operation of an electric drive means which receives an instruction from a timing setting device when a flow rate regulating valve is operated rapidly and with a large change in opening. CONSTITUTION:When the load that is detected increases much, the degree of opening of a pressure regulator 2 is increased forcibly and in an appropriate width by an electromagnet 10 a little faster than the increase in the degree of opening of a flow rate control valve 5, and then the degree of opening of the flow rate control valve 5 is increased rapidly and in a great deal to obtain a large calorific value which matches a large load in a large size combustion device 3. And, when a value of load that is detected decreases much rapidly, the degree of opening of the pressure regulating device 2 is reduced forcibly and in an appropriate width by the electromagnet 10 a little faster than the reduction of the degree of opening of the flow rate regulating valve 5, and then the degree of opening of the flow rate regulating valve 5 is reduced rapidly and in a large width in order to obtain a small calorific value which matches the small load of the large size combustion device 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to large combustion equipment such as hospitals and small-scale factories where the amount of gas fuel supplied rapidly and drastically increases or decreases, and table stoves, etc. In cases where small combustion equipment such as The present invention relates to gas supply equipment that is equipped with a self-powered pressure regulator on the upstream side to maintain the secondary pressure at a set value.

[Conventional technology]

Conventionally, in order to take advantage of the advantages of self-powered pressure regulators, which are difficult to break down and have high safety, secondary pressure has been adjusted only by the opening and closing action of the self-powered pressure regulator.

[Problem to be solved by the invention]

However, self-powered pressure regulators that operate based on internal pressure balance have limited responsiveness due to their mechanism, and if the flow rate control valve is opened or closed with a rapid large change in opening,
The follow-up operation of the self-powered pressure regulator becomes impossible, and the gas pressure on the downstream side of the self-powered pressure regulator decreases or increases significantly.For example, the flow rate adjustment function may deteriorate, or other combustion equipment may close due to safety valves when the gas pressure drops. Various problems such as unexpected fire extinguishment were likely to occur, and there was room for improvement in the negative layer.

The purpose of the present invention is to control pressure changes downstream of the self-powered pressure regulator, regardless of rapid and wide changes in the opening of the flow control valve, while regulating pressure using a self-powered pressure regulator that is excellent in safety. The point is to be able to suppress it sufficiently.

[Means to solve the problem]

The characteristic configuration of the present invention is that an electric drive means for forcibly changing the opening is attached to a self-powered pressure regulator provided upstream of the flow rate control valve, and an operation means for operating the flow rate control valve and the drive unit in conjunction. In addition to providing
The operation means controls the opening degree of the pressure regulator to be equal to the flow rate when the flow rate regulating valve is adjusted at a speed higher than a set value and with a change in opening degree higher than the set value. In order to change the timing in the same direction as the PI mode valve, a timing setting means for operating the driving means for a set time is provided, and its effects are as follows.

[For production]

In other words, when the flow rate control valve is operated rapidly and with a large opening change, the self-powered pressure regulator is automatically forced to open for the set time by the operation of the electric drive means based on instructions from the timing setting means. Since the valve is operated in the valve closing direction, a secondary pressure change due to a wide change in the amount of gas supplied from the flow control valve to the supply target may occur due to a malfunction in the pressure regulation operation of the self-powered pressure regulator. It can be suppressed sufficiently and reliably.

To explain further, when the flow control valve is rapidly opened from a small opening θ1 to a large opening θ2 as shown in FIG. 3(A),
If there is no electric drive means, as shown in Figure 3 (El), after the secondary pressure drops significantly, it returns to almost the set value due to the pressure regulating action of the self-powered pressure regulator, and the secondary pressure remains at its maximum drop. ΔP and the time required for recovery Δt1 are determined by the operating characteristics of the self-powered pressure regulator and the supply target while the opening degree of the flow control valve is increasing (θ8 - θ
, ), it becomes almost constant. Therefore, Fig. 3 (
As shown in c), if the energizing voltage V and the energizing time Δt8 for the electric drive means to open the pressure regulator valve are appropriately set in accordance with the maximum decreasing period ΔPl of the secondary pressure and the recovery time Δt1. As shown in FIG. 3(d), changes in the secondary pressure can be sufficiently suppressed, and highly accurate secondary pressure adjustment can be reliably realized.

In addition, as shown in Figure 3 (a), the flow rate control valve is opened at a large opening θ2.
When the valve is rapidly closed from the opening to the small opening θ, if there is no electric drive means, the secondary pressure will rise significantly as shown in Figure 3 (tl), and then the self-powered pressure regulator will adjust. Due to the pressure action, it almost returns to the set value, and during the maximum increase in secondary pressure ΔP2 and recovery time Δt
3 becomes approximately constant in accordance with the operating characteristics of the self-powered pressure regulator and the opening degree of the flow rate regulating valve (θ2-θI), which is determined by the supply target. Therefore, as shown in FIG. 3(c), the voltage applied to the electric drive means for closing the regulator valve is V! and energization time Δt4 during the maximum increase in secondary pressure ΔP! If it is set appropriately according to the recovery time Δt3, the result shown in Fig. 3 (
As shown in (d), changes in the secondary pressure can be sufficiently suppressed, and highly accurate secondary pressure adjustment can be reliably achieved.

Since the electric drive means operates only for a limited period of time, the gas supply pressure can normally be maintained safely using a self-powered pressure regulator without any trouble caused by failure.

〔Effect of the invention〕

As a result, not only can the gas supply pressure be maintained safely with a self-powered pressure regulator, but also the gas supply pressure can be maintained with high accuracy even if the flow rate control valve is rapidly and widely increased or decreased in opening. We are now able to provide high-performance gas supply equipment.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 and 2.

A self-powered pressure regulator (2) that maintains the secondary pressure at a set value is installed on the fuel gas line (1) such as city gas, and is used for large combustion equipment (3) whose load changes suddenly such as boilers, instantaneous water heaters, etc. A small combustion device (4) such as a table stove is connected in parallel to the pressure regulator (2).

The self-powered pressure regulator (2) is a known one that automatically adjusts the opening degree of the valve (2c) based on the balance between the biasing force of a spring (2b) and weight acting on the diaphragm (2a) and the secondary pressure.
Any of the direct acting type, lever type, Fischer type, axial flow type, etc. may be used.

For example, from 1.5 kg/cd to 0 by pressure regulator (2)
．． 02) Flow control valve (5) that adjusts the supply amount of gas fuel reduced to cg/cd to the large combustion equipment (3), and combustion air from the blower (B) to the large combustion equipment (3) An actuator (7) is provided that operates in conjunction with a damper (6) that adjusts the supply amount, and the actuator (7) is automatically operated according to a set program based on information from a sensor (S) that detects the load of the large combustion equipment (3). A controller (8) is provided for operation.

In the self-powered voltage regulator (2), a permanent magnet (9) is attached to the diaphragm (2a), and an electromagnet (10) is attached to the case (2d), and the applied voltage value to the electromagnet (10) is adjusted and the applied voltage is adjusted. A power regulator (11) that performs reverse switching is provided, and the operating force for the valve (2c) can be adjusted by adjusting the applied voltage value by the power regulator (11), and the operating force can be adjusted by switching the applied voltage forward and backward. It is configured to be switched between a valve opening direction and a valve closing direction.

The following (
The controller (8) is provided with the means described in (a) to (f) above.

(b) Load detection value from sensor (S) and setting device (
Opening degree setting means (13) for instructing the actuator (7) for the flow control valve (5) and damper (6) to operate based on the set load from 12) and according to a preset program.

(ff) Delay means (14) for delaying the operation instruction from the opening degree setting means (13) to the actuator (7) by a set short time.

(c) Load change direction determining means (18) for determining whether the load has increased or decreased based on the load detection value from the sensor (S).

(d) Load detection value from sensor (S) and setting device (1
Load fluctuation determining means (16) for determining whether the actual load fluctuation (per hour) is equal to or greater than the set value based on the load fluctuation heavy set value from 5).

(n) Based on the information from the load fluctuation direction determining means (18) and the load fluctuation determining means (16), each time the actual load fluctuation exceeds the set value, the power regulator (11) In addition to instructing the applied voltage value according to the program during load fluctuations, when the load increases, the voltage regulator (2
) instructs the direction of the applied voltage so that the t magnet (lO) acts in the direction of opening the valve and in the direction of closing the valve when the voltage decreases, and further instructs the delay means (14) to operate. ).

(A)! From the pressure indicating means (19) to the power regulator (11)
) for a set time period.
).

In short, the self-powered pressure regulator (2) automatically adjusts the supply amount of gas fuel whose pressure has been made constant according to the load value detected by the sensor (S), and adjusts the calorific value of the large combustion equipment (3). It is configured to do so. When the load detection amount suddenly increases to a large extent, the pressure regulator (2) is activated by the electromagnet (10) slightly earlier than the increase in the opening of the flow rate tyam valve (5).
The opening of the flow control valve (5) is then increased rapidly and widely to generate a large amount of heat commensurate with the large load of the large combustion equipment (3). This is how you get it. In addition, when the load detection value decreases rapidly and widely, the pressure regulator (2) is forcibly activated by the electromagnet (10) slightly earlier than the opening degree of the flow control valve (5) decreases. The opening is decreased, and then the opening of the flow rate control valve (5) is rapidly and widely decreased to obtain a small amount of heat commensurate with the small load of the large combustion equipment (3).

As a result, even though the pressure regulating operation of the pressure regulator (2) is unable to follow the rapid and large increase or decrease in the amount of gas fuel supplied to the large combustion equipment (3), the pressure regulator (2) eliminates the trouble of a significant drop or increase in secondary pressure, and eliminates the problem of large combustion equipment (3) and small combustion equipment (4).
), it is possible to prevent an unexpected large decrease or increase in the amount of gas fuel supplied to the combustion equipment (4), or an unexpected fire extinguishment due to automatic shutoff due to a drop in the secondary pressure of the small combustion equipment (4).

[Another example]

Next, another embodiment will be described.

The number of combustion devices installed is not limited, and one or more large combustion devices (3) may be provided.

The type of gas to be supplied may be of any kind, and the object of gas supply may be of any kind. For example, the present invention can be used even when supplying a processing gas to a reactor or the like in a chemical plant.

The types of the flow control valve (5) and self-powered pressure regulator (2) can be appropriately selected from known types.

The specific configuration of the electric means for forcibly changing the opening degree of the pressure regulator (2) is, for example, using two solenoids to open and close each separately, or using forward and reverse rotation of a servo motor to apply the opening and closing operation force. These means can be changed as appropriate, such as adding, and these means are collectively referred to as electric drive means (9°10).

The means for operating the operation parts of the flow control valve (5) and the electric drive means (9, 10) in conjunction with each other can be appropriately changed to electric, mechanical, fluid, etc., and these are collectively referred to as the operation means (8). . The operation means (8) may be operated manually.

When the opening of the flow rate control valve (5) is adjusted at a speed higher than the set value and with a change in the degree of opening higher than the set value, the opening of the pressure regulator (2) is changed in the same direction as the flow rate control valve (5) for the set time. To let you
The software to be based on can be freely selected, and various hardware based on these software are collectively referred to as timing setting means (16 to 19).

The setting time by the timing setting means (16 to 19) and the setting time by the delay means (14) are determined by the self-powered pressure regulator (
2) should be selected appropriately depending on the actual situation such as the operating characteristics and the tendency for the opening degree of the flow rate control valve (5) to increase or decrease.

The delay means (14) may be omitted.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a conceptual diagram of the equipment, and FIG. 2 is an explanatory diagram of the control system. Figure 3 (
A) or 2) are explanatory diagrams showing changes in load fluctuation, electric power, and secondary pressure. (2)...Self-powered pressure regulator, (3), (4)
... Combustion equipment, (5) ... Flow control valve, (8) ... Operation means, (9, 10) ...
...driving means, (14)...delay means, (16
or 19)... Timing setting means.

Claims (1)

[Claims] 1. Flow control valve (5) for adjusting the amount of gas supplied to the supply target.
) is a gas supply facility equipped with a self-powered pressure regulator (2) for maintaining the secondary pressure at a set value on the upstream side of Driving means (9, 10) are attached, and the flow rate regulating valve (5)
and an operating means (
8), and the operating means (8) is configured to control the opening of the pressure regulator (2) when the flow rate regulating valve (5) is adjusted in opening at a speed higher than a set value and with a change in opening higher than a set value. The gas supply equipment is provided with timing setting means (16 to 19) for operating the driving means (9, 10) for a set time in order to change the flow rate in the same direction as the flow control valve (5). 2. Combustion equipment to which supply targets are connected in parallel (3), (4)
The gas supply equipment according to claim 1, wherein the gas supply is fuel. 3. The timing setting means (16 to 19) includes a delay means (14) for operating the drive means (9, 10) by a set time in advance of the flow control valve (5). The gas supply equipment according to item 1 or 2.