CN110496830A - A kind of condenser piping dredger and its dredging method - Google Patents

Abstract

A kind of condenser piping dredger and its dredging method, the dredger includes long tube (1), it is welded in the solid hopkinson bar (8) on long tube top, it is welded in the hollow boring bit (2) of long tube front end, it is set in the casing (3) of the outer rear end of long tube, it is installed on the gland (4) at casing both ends, the sealing ring (5) and sealing ring (6) being set between gland and casing, the water inlet pipe (7) being plugged on casing, one group of inlet opening (1-1) for leading to long tube centre bore is offered around tube wall on one section of long pipe being located in casing, the inner hole of long tube is communicated with the inner hole of hollow boring bit.The present invention can effectively remove the scale in the long and narrow pipeline of condenser, and easy to operate, scale removal is high-efficient.

Description

Condenser pipe dredging device and dredging method thereof

technical field

The invention relates to the technical field of pipeline dredging, in particular to a condenser pipeline dredging device and a dredging method thereof.

technical background

The condenser is the auxiliary equipment of the steam turbine unit. Through the heat exchange between the condenser and the steam discharged from the steam turbine, the steam discharged from the steam turbine is quickly cooled into condensed water, which ensures a low exhaust back pressure of the unit and ensures that the unit operates at a high temperature. operating within the efficiency range. During the long-term operation of the unit, the circulating water in the condenser pipe is continuously evaporated and concentrated, resulting in the continuous decomposition and precipitation of bicarbonate and silicate dissolved in the water, resulting in scaling and blockage in the condenser pipe.

The inner diameter of the condenser tube is usually less than 20mm, and the entire length is usually more than 4000mm. The pipe is long and narrow and arranged horizontally. Once scaling is formed, it will seriously affect the heat transfer of the condenser, resulting in insufficient output of the steam turbine unit and reducing the efficiency of the unit. The surface roughness of the scale is much larger than that of the metal pipe wall. In the area where scale is formed, the core of subsequent scaling will be formed, which will accelerate the formation of scale, and eventually cause the condenser pipe to be completely blocked and the condenser to be scrapped.

Existing pipeline descaling methods mainly include mechanical cleaning and chemical cleaning. Limited by the size of cleaning equipment, mechanical cleaning cannot effectively remove scale in long and narrow pipes. Chemical cleaning has no requirements on the pipe diameter, but the flow channel must be connected, and the cleaning agent can form a cycle to effectively remove scale. Once the condenser pipe is seriously blocked, chemical cleaning is difficult to achieve the desired effect.

Contents of the invention

The purpose of the present invention is to solve the problems of the prior art, aiming at the characteristics of the condenser pipes, to provide a condenser pipe dredging device which is easy to use and has a good cleaning effect, and the invention also provides a method for dredging the pipes with this device.

The technical scheme that the present invention takes is as follows:

A condenser pipeline dredging device, comprising a long tube, a solid rod welded to the top of the long tube, a hollow drill bit welded to the front end of the long tube, a casing sleeved on the outer rear end of the long tube, glands installed at both ends of the casing, The sealing ring and the sealing ring arranged between the gland and the casing, and the water inlet pipe inserted into the casing, a group of inlet pipes leading to the center hole of the long pipe are opened around the pipe wall on a section of the long pipe located in the casing. The water hole, the inner hole of the long pipe communicates with the inner hole of the hollow drill bit.

The solid rod of the present invention is a square rod. The total length of the dredging device is 2500mm, and the water inlet holes provided on the long pipe are 20 holes evenly distributed, and the diameter of the water inlet holes is Φ2.5mm.

Adopt the dredging device described in the present invention to dredge the method for condenser pipeline as follows:

a. Aim the hollow drill bit at the inlet of the blocked condenser pipe, and first screw in the drill bit to destroy the scale surface in the pipe;

b. Feed acetic acid into the condenser pipe through the water inlet pipe and apply a certain pressure. The acid liquid enters the center hole of the long pipe through the water inlet hole, and then shoots out from the front end of the hollow drill bit, so that the acid liquid can fully penetrate into the scale gap middle;

c. The acid reacts with the scale in the pipeline. At this time, observe whether there are bubbles in the pipeline. When no bubbles emerge, it means that the reaction is over and the scale has been softened and dissolved;

d. Rotate the hollow drill bit into the condenser pipe again to further break up the softened scale;

e. Then pass clean water into the condenser pipe through the water inlet pipe to wash out the scale broken by the drill bit;

f. Repeat steps b~e until the condenser pipe scale is cleaned up.

The dredging device of the present invention can be screwed into the pipeline of the condenser through the hollow drill bit, breaks the scale attached to the inner wall of the pipeline, softens the scale in the pipeline by feeding acid solution from the water inlet pipe, and washes out the softened scale by passing in clean water. The acid liquid and clear water fed in also play the role of cooling the hollow drill bit, lubricating and promoting slag discharge, which can prevent the drill bit from being broken due to heat during the precession process. The device of the invention can effectively remove the scale in the long and narrow pipeline of the condenser, and has simple operation and high scale removal efficiency.

Description of drawings

Fig. 1 is an outline drawing of the present invention;

Fig. 2 is a structural diagram of the present invention cut along the axial direction.

Detailed ways

The condenser pipeline dredging device shown in Figure 1 and Figure 2 includes a long tube 1, a solid rod 8 welded to the top of the long tube, a hollow drill bit 2 welded to the front end of the long tube, and a sleeve sleeve set on the outer rear end of the long tube 3. The gland installed at both ends of the casing 4, the sealing ring 5 and the sealing ring 6 arranged between the gland and the casing, the water inlet pipe 7 inserted on the casing, on a long pipe located in the casing A group of water inlet holes 1-1 leading to the center hole of the long pipe are provided, and the center hole of the long pipe communicates with the center hole of the hollow drill bit. The long pipe is made of 06Cr19Ni10 stainless steel pipe with a specification of Φ12×2, and the overall length of the dredging device is 2500 mm after the overall production and molding. 20 water inlet holes are evenly distributed around the pipe wall on a long pipe wrapped by the casing, and the diameter of the water inlet holes is Φ2.5mm. The hollow drill bit 2 can be purchased directly from the market. The solid rod 8 is made as a square rod, which is convenient for suiting the handle or clamping with a hand-held electric drill. The device of the invention is particularly suitable for cleaning carbonate and silicate scales in long and narrow pipelines with an inner diameter of less than 20 mm and a length of more than 4000 mm.

The method of dredging the condenser pipe with the dredging device is as follows:

a. Aim the hollow drill bit 2 at the inlet of the blocked condenser pipe, and first screw the drill bit in to destroy the scale surface in the pipe;

b. Feed acetic acid into the condenser pipe through the water inlet pipe 7 and apply a certain pressure. The acid liquid enters the center hole of the long pipe through the water inlet hole 1-1, and then shoots out from the front end of the hollow drill bit to allow the acid liquid to fully penetrate into crevices of limescale;

c. The acid reacts with the scale in the pipeline. At this time, observe whether there are bubbles in the pipeline. When no bubbles emerge, it means that the reaction is over and the scale has been softened and dissolved;

d. Rotate the hollow drill bit into the condenser pipe again to further break up the softened scale;

e. Then pass clean water into the condenser pipe through the water inlet pipe 7, and wash out the scale broken by the drill bit;

f. Repeat steps b~e until the condenser pipe scale is cleaned up.

Claims (4)

1. A condenser pipe dredging device is characterized in that it comprises a long pipe (1), a solid rod (8) welded to the top of the long pipe, a hollow drill bit (2) welded to the front end of the long pipe, The casing (3) at the outer rear end, the gland (4) installed at both ends of the casing, the sealing ring (5) and sealing ring (6) arranged between the gland and the casing, and the sealing ring (6) inserted on the casing Water inlet pipe (7), a group of water inlet holes (1-1) leading to the center hole of the long pipe is opened around the pipe wall on a section of long pipe located in the casing, and the inner hole of the long pipe communicates with the inner hole of the hollow drill bit . 2. A condenser pipe dredging device according to claim 1, characterized in that the solid rod (8) is a square rod. 3. a kind of condenser pipe dredging device as claimed in claim 1, is characterized in that, the total length of described dredging device is 2500mm, and the water inlet hole (1-1) that offers on long pipe is uniformly distributed 20 holes, the diameter of the water inlet hole is Φ2.5mm. 4. adopt the method for dredging condenser pipeline as described in claim 1～3, it is characterized in that, method is as follows: a. Aim the hollow drill bit (2) at the inlet of the blocked condenser pipe, and first screw in the drill bit to destroy the scale surface in the pipe; b. Feed acetic acid into the condenser pipe through the water inlet pipe (7) and apply a certain pressure. The acid liquid enters the center hole of the long pipe through the water inlet hole (1-1), and then shoots out from the front end of the hollow drill bit, allowing the The acid solution fully penetrates into the crevices of the scale; c. The acid reacts with the scale in the pipeline. At this time, observe whether there are bubbles in the pipeline. When no bubbles emerge, it means that the reaction is over and the scale has been softened and dissolved; d. Rotate the hollow drill bit into the condenser pipe again to further break up the softened scale; e. Then pass clean water into the condenser pipe through the water inlet pipe to wash out the scale broken by the drill bit; f. Repeat steps b~e until the condenser pipe scale is cleaned up.