CN104019696B - A kind of condenser cleaning equipment based on injection effect and method - Google Patents

Abstract

The invention discloses a condenser cleaning device and method based on the ejection effect. The device is composed of an ejection device with one end connected to a cleaning nozzle of a robot, and the other end positioned on the inlet of a heat exchange tube of the condenser. It consists of a suction section, Constriction section, throat mixing section, outlet diffuser section and outlet sealing section; the method includes: positioning the outlet sealing section to the heat exchange tube of the condenser that needs to be cleaned; turning on the high-pressure water pump, and the high-pressure water enters through the high-speed jet of the cleaning nozzle At the suction section, a large amount of water around the cleaning device is sucked from the inlet of the suction section at the same time. The high-speed water flow and the sucked water are mixed through the ejection device and finally enter the heat exchange tube of the condenser. The condenser is flushed by the water flow. The dirt of the heat exchange tube inner wall is removed. The invention can be cleaned on-line, saves the maintenance cost of the power plant, has a good cleaning effect on soft scales such as algae, is pollution-free, and is safe and simple to operate.

Description

A condenser cleaning device and method based on ejection effect

technical field

The invention relates to the technical field of condenser cleaning, in particular to a condenser cleaning device and method suitable for thermal power plants based on the ejection effect.

Background technique

The condenser is the cold end of the thermal cycle of the power plant. Its main function is to condense the exhaust steam of the steam turbine into water to form and maintain a high vacuum. The scaling on the inner wall of the heat exchange tube of the condenser can be divided into three types according to the formation mechanism: scale, sludge, and biological slime. Scale is formed by the continuous evaporation of circulating water, which concentrates and deposits calcium and magnesium in the water. Its main component is calcium carbonate, which belongs to hard scale and is not suitable for removal. Scale is caused by impurities, dust, sand, microbial groups, etc. contained in circulating water. Formed by deposition, it is relatively loose; biological slime is a layer of biofilm attached to the pipe wall due to the growth and reproduction of algae and fungi in water, which is relatively soft.

After the heat exchange tube of the condenser is fouled, the heat exchange effect will be reduced, the vacuum will be deteriorated, the thermal efficiency of the cycle will be reduced, the coal consumption of power generation will be increased, and the economy of the unit will be reduced; the heat exchange tube will be corroded, and the service life of the condenser will be reduced. Leakage will have a major impact on the quality of soda water and the safe operation of the unit. Therefore, it is very important to clean the condenser heat exchange tube in time to keep it clean.

At present, the cleaning methods of the condenser mainly include: 1) rubber ball cleaning, which is currently a widely used cleaning method. It can realize online cleaning, the cleaning effect is good, and the operation is safe, but the rubber ball is easy to block in the tube, the recovery rate is low, and the cost is high. 2) Chemical cleaning. Its cleaning is relatively thorough and can be cleaned online, but the process is cumbersome, and it is difficult to accurately control the dosage, which may cause equipment corrosion and cost a lot. 3) Artificial steel brush cleaning. This method can achieve the purpose of cleaning, but it can only be cleaned offline, which is time-consuming and laborious. 4) High-pressure water jet condenser online cleaning robot technology. This technology maintains the characteristics of thorough cleaning of off-line high-pressure water jet cleaning, no damage to the condenser, and no pollution. It can also achieve online descaling, avoiding economic losses caused by startup and shutdown, and has a good prospect. At present, this technology uses high-pressure water to drive the nozzle connected to the high-pressure water hose and extend it into the condenser tube for cleaning. However, some problems have been encountered in engineering practice. For example, it requires a lot of cleaning when the nozzle is inserted into the condenser tube. Therefore, in practice, there may be insufficient thrust and the nozzle cannot be fully extended, resulting in incomplete cleaning; the nozzle and high-pressure water hose may be stuck in the heat exchange tube; the coil device of the high-pressure water hose is reliable under water The compatibility is not strong; there may be insufficient space for the coil system to be arranged underwater.

Contents of the invention

Technical problem: The object of the present invention is to overcome the deficiencies in the prior art, and provide a condenser cleaning device and method based on the ejection effect with simple structure, convenient operation, strong reliability, and good cleaning effect.

Technical solution: The condenser cleaning device based on the ejection effect of the present invention is composed of an ejector device with one end set on the cleaning nozzle of the robot through the nozzle fixing seat, and the other end positioned on the inlet of the heat exchange tube of the condenser. The ejection device is sequentially composed of a suction section, a constriction section, a throat mixing section, an outlet diffuser section and an outlet sealing section; Sections are connected, the outlet diffuser section is conical, the small mouth end is connected with the throat mixing section, and the large mouth end is connected with the outlet sealing section.

The horizontal angle of the shrinkage section is 30°, and the length is 10-13mm; the diameter of the throat mixing section is 13mm-17mm, and the length is 52-68mm; the horizontal angle of the outlet diffuser section is 3-5°, The length is 45-80mm.

Use the method for cleaning the condenser based on the ejection effect of the above-mentioned device, comprising the steps:

a. Set the suction section of the injection device on the cleaning nozzle of the robot through the nozzle fixing seat, position the outlet sealing section of the injection device on the inlet of the condenser heat exchange tube to be cleaned, and press it tightly;

b. Turn on the high-pressure water pump, the high-pressure water is accelerated and decompressed by the cleaning nozzle of the robot, and then injected into the contraction section of the ejection device at high speed through the suction section of the ejection device, and creates a low pressure near the outlet of the cleaning nozzle of the robot. The pressure of water in the underwater environment is greater than the pressure of the high-speed water flow near the outlet of the cleaning nozzle, so the water around the cleaning device is sucked in a large amount and enters from the inlet of the suction section; together with the high-speed water flow of the cleaning nozzle of the robot, it is introduced through the contraction section The throat mixing section gradually mixes evenly, then enters the outlet diffuser section, and finally enters the condenser heat exchange tube through the outlet sealing section, and removes the dirt on the inner wall of the condenser heat exchange tube by washing with water.

Beneficial effects: due to the adoption of the above technical scheme, the present invention can effectively remove the soft scale represented by algae on the heat exchange tube of the condenser, and effectively solve the problems encountered by the current high-pressure water jet condenser online cleaning robot in engineering practice. some problems. Compared with the prior art, it has the following advantages:

1) On-line cleaning can be performed, and the generator set does not need to be shut down during cleaning, which saves the maintenance cost of the power plant.

2) After using this device, the flow rate of water in the heat exchange tube can reach 7m/s, which has a good cleaning effect on soft scale represented by algae; If the heat exchange tube of the boiler is used, the axial velocity decays rapidly, and the velocity is almost 0 after 0.1m, while the total length of the heat exchange tube is 10m, which means that the subsequent 9.9m cannot be effectively cleaned. Therefore, the use of this device can greatly increase the flow rate of water in the heat exchange tube of the condenser, thereby improving its cleaning effect, thereby ensuring the normal and efficient operation of the condenser and the economical operation of the unit.

3) No pollution, safe operation and no damage to the pipe wall.

4) The method is simple and easy, and the cost is low.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the present invention.

Fig. 2 is a structural view of the nozzle holder of the present invention.

In the figure: 1-Robot cleaning nozzle, 2-Suction section, 3-Constriction section, 4-Throat mixing section, 5-Exit diffuser section, 6-Exit sealing section, 7-Condenser heat exchange tube, 8- Nozzle holder.

Detailed ways

An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

The condenser cleaning device based on the ejection effect of the present invention is composed of an ejector device with one end set on the robot cleaning nozzle 1 through the nozzle fixing seat 8, and the other end positioned on the inlet of the condenser heat exchange tube 7. The ejection device is sequentially composed of suction section 2, constriction section 3, throat mixing section 4, outlet diffuser section 5 and outlet sealing section 6; is 30°, and the length is 10-13mm; the large mouth end of the contraction section 3 is connected with the suction section 2, and the small mouth end is connected with the throat mixing section 4, and the diameter of the throat mixing section 4 is 13mm-17mm, and the length is 52- 68mm; the outlet diffuser section 5 is in the shape of a cone, the horizontal angle of the outlet diffuser section 5 is 3-5°, and the length is 45-80mm. The small opening end of the outlet diffuser section 5 is connected with the throat mixing section 4 , and the large opening end is connected with the outlet sealing section 6 .

Use the method for cleaning the condenser based on the ejection effect of the above-mentioned device, and include the following steps during specific implementation:

a. Set the suction section of the injection device on the robot cleaning nozzle 1 through the nozzle fixing seat 8, position the outlet sealing section 6 of the injection device on the inlet of the condenser heat exchange tube 7 that needs to be cleaned, and press it tightly;

b. Turn on the high-pressure water pump, and the 10-20MPa high-pressure water is accelerated and decompressed by the robot cleaning nozzle 1, and then injected into the contraction section 3 of the ejection device at a high speed through the suction section 2 of the ejection device, and is caused near the exit of the robot cleaning nozzle 1. Low pressure, because the pressure of the water in the underwater environment where the cleaning device is working is greater than the pressure of the high-speed water flow near the outlet of the cleaning nozzle, so the water around the cleaning device is sucked in a large amount and enters from the inlet of the suction section 2 through the nozzle fixing seat 8 ; and the high-speed water flow of the robot cleaning nozzle 1 is introduced into the throat mixing section 4 through the contraction section 3 and gradually mixed evenly, then enters the outlet diffuser section 5, and finally enters the condenser heat exchange tube 7 through the outlet sealing section 6, and passes through The dirt on the inner wall of the condenser heat exchange tube 7 is removed by the washing of the water flow.

Claims (3)

1. A condenser cleaning device based on the ejection effect, characterized in that: it is set on the robot cleaning nozzle (1) by one end through the nozzle holder (8), and the other end is positioned on the condenser heat exchange tube ( 7) The injection device on the inlet is composed of the suction section (2), the contraction section (3), the throat mixing section (4), the outlet diffuser section (5) and the outlet sealing section ( 6) Composition; the contraction section (3) is conical, the large mouth end is connected to the suction section (2), the small mouth end is connected to the throat mixing section (4), and the outlet diffuser section (5) is conical shape, the small mouth end links to each other with the throat mixing section (4), and the big mouth end links to each other with the outlet sealing section (6). 2. A kind of condenser cleaning device based on ejection effect according to claim 1, is characterized in that: the horizontal angle of described constriction section (3) is 30 °, and length is 10-13mm; The diameter of the mixing section (4) is 13mm-17mm, and the length is 52-68mm; the horizontal angle of the outlet diffuser section (5) is 3-5°, and the length is 45-80mm. 3. a condenser cleaning method based on the ejection effect using the device according to claim 1, is characterized in that, comprises the steps: a. Set the suction section (2) of the injection device on the cleaning nozzle (1) of the robot through the nozzle fixing seat (8), and position the outlet sealing section (6) of the injection device on the heat exchange of the condenser to be cleaned on the inlet of the pipe (7), and press it tightly; b. Turn on the high-pressure water pump, the high-pressure water is accelerated and decompressed by the robot cleaning nozzle (1), and then injected into the contraction section (3) of the ejection device at high speed through the suction section (2) of the ejection device, and then the robot cleans the nozzle (1) Because the pressure of the water in the underwater environment where the cleaning device works is greater than the pressure of the high-speed water flow near the outlet of the cleaning nozzle, the water around the cleaning device is sucked in large quantities from the inlet of the suction section (2) Enter; together with the high-speed water flow of the robot cleaning nozzle (1), it is introduced into the throat mixing section (4) through the contraction section (3) and gradually mixed evenly, then enters the outlet diffuser section (5), and finally passes through the outlet sealing section (6 ) into the condenser heat exchange tube (7), and the dirt on the inner wall of the condenser heat exchange tube (7) is removed by the washing of the water flow.