CN214120924U

CN214120924U - Cleaning device for plate-fin heat exchanger

Info

Publication number: CN214120924U
Application number: CN202023222625.2U
Authority: CN
Inventors: 王荀; 霍成立; 杨文明; 吴永明; 胡建焕; 刘玉荣; 柯鹏; 吴进军; 张祖涛; 刘金海; 刘超; 庞杰; 黄仙; 张星星
Original assignee: Yangxin Pengfu Mines Co ltd
Current assignee: Hubei High Energy Pengfu Environmental Protection Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-09-03
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses a cleaning device of a plate-fin heat exchanger, which comprises a liquid dividing pipe, a plurality of spray pipes, a sedimentation tank and an alkali liquor tank which are sequentially communicated to form a circulation; the shower is pre-buried at the vertical hot side passageway top that extends, and the sedimentation tank is separated into two regions by the filter screen, and the alkali lye pond sets up the pH meter, installs the circulating pump on the pipeline between alkali lye pond and the branch liquid pipe. The corrosion of the heat exchange plate in the cleaning process can be reduced by adopting alkali liquor instead of acid liquor; the spray pipe is pre-embedded at the top in the hot side channel, so that the cleaning agent can more completely cover the inner wall of the hot side channel, and the cleaning effect is better than that of an external spray mode; the sedimentation tank filters the slag blocks, so that the cleaning agent can be recycled, and the utilization efficiency of the cleaning agent is improved; and the circulating spraying is used for replacing the complete soaking on the basis of ensuring that the scales are continuously contacted with the cleaning agent, so that the using amount of the cleaning agent is obviously reduced, and the scales are easier to fall off from the inner wall of the heat exchange channel due to the impact of water flow on the scales.

Description

Cleaning device for plate-fin heat exchanger

Technical Field

The utility model relates to a gas cleaning technical field, concretely relates to cleaning device of plate-fin heat exchanger.

Background

The hazardous waste treatment process generally produces more sulfur dioxide, nitrogen oxide, volatile organic compounds, heavy metal ions and the like, and the harmful substances are often mixed in the flue gas together with a large amount of water vapor. In order to reduce the emission of harmful substances, the flue gas needs to be cooled, so that the water vapor is condensed and a part of the harmful substances in the flue gas are taken away. Usually, the high temperature flue gas is heat exchanged with low temperature clean air in a heat exchanger. In the process, organic matters which are not oxidized and combusted are condensed in the heat exchanger to form oil stains, escaping ammonia in the SCR system treatment for reducing nitrogen oxides and oxidized sulfur trioxide to form ammonium sulfate or ammonium bisulfate, oxides of sulfur cause high condensation temperature, and stainless steel corrosion can cause the blockage of the heat exchanger. Among them, ammonium sulfate or ammonium bisulfate and oil stain are easy to adsorb smoke dust particles due to strong viscosity, so that the heat exchanger is easy to block.

For this gas-gas heat exchange, plate-fin heat exchangers are generally used for heat exchange. The main structure of the heat exchanger is a cuboid formed by alternately arranging and fixing a plurality of horizontally extending cold side channels and a plurality of vertically extending hot side channels, and the cuboid and a detachable shell on the outer side form two groups of channels which are not communicated with each other. The plate-fin heat exchanger has compact structure, large heat exchange area and high heat transfer efficiency, and is widely applied to various industrial fields needing waste heat utilization. But also due to the composition of the heat exchange medium and its compact construction. Because the interval of its heat transfer board is little, and the passageway is narrow, and the flue gas composition that produces in the useless processing of danger simultaneously is complicated, consequently leads to it to block up often in the short-term, causes pressure differential too big, heat exchange efficiency to reduce.

In the process of cooling flue gas in the hazardous waste industry, the main components of scale formation comprise rust, sulfate, oil stain, ammonium salt and the like. The material fatigue strength of scale deposit is great, adopts conventional physical mode to be difficult to wash, and the major structure of heat transfer board is a whole, disassembles the process complicacy, shuts down to disassemble and washs and can consume a large amount of time, seriously influences production efficiency. Meanwhile, due to the problems of the material of the heat exchange plate and the components of the flue gas, the corrosion of the equipment is easily aggravated by adopting an acid washing mode aiming at common scale.

At present, the cleaning modes commonly adopted by the heat exchanger comprise ultrasonic cleaning, mechanical cleaning of a steel brush, soaking cleaning of a cleaning agent, knocking vibration auxiliary cleaning and the like. Due to the structure of the heat exchange plate of the plate-fin heat exchanger, the disassembly is difficult, and the common mode of spraying water or cleaning agent from the outside hardly enables the cleaning agent to enter the inside of the heat exchange channel to react with dirt. Meanwhile, because the sealing workload of the inlet and the outlet of the heat exchanger is large, a complete soaking mode is rarely adopted. Therefore, the plate-fin heat exchanger is difficult to clean and low in cleaning efficiency.

SUMMERY OF THE UTILITY MODEL

To big, the cleaning efficiency is not high, disassemble and wash the problem that the downtime is long of the washing degree of difficulty of plate-fin heat exchanger, the utility model provides a belt cleaning device of plate-fin heat exchanger.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a cleaning device of a plate-fin heat exchanger is provided with a plurality of vertically extending hot side channels and a plurality of horizontally extending cold side channels which are formed by enclosing a plurality of heat exchange plates arranged in parallel, and comprises a liquid distributing pipe, a plurality of spray pipes, a sedimentation tank and an alkali liquor tank which are sequentially communicated to form a circulation; the spray pipe is pre-buried at hot side passageway top, the sedimentation tank is separated into two regions by the filter screen, the lye pond sets up the pH meter, install the circulating pump on lye pond and the pipeline that divides between the liquid pipe.

Compared with the prior art, the utility model discloses following beneficial effect has:

the corrosion of the heat exchange plate in the cleaning process can be reduced by adopting alkali liquor instead of acid liquor; the spray pipe is pre-embedded at the top in the hot side channel, so that the cleaning agent can more completely cover the inner wall of the hot side channel, and the cleaning effect is better than that of a conventional external spray mode; the sediment block formed in the process of washing and washing is filtered by the sedimentation tank, so that the cleaning agent is recycled, and the utilization efficiency of the cleaning agent is improved; and the circulating spraying is used for replacing the complete soaking on the basis of ensuring that the scales are continuously contacted with the cleaning agent, so that the using amount of the cleaning agent is obviously reduced, and the scales are easier to fall off from the inner wall of the heat exchange channel due to the impact of water flow on the scales.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention.

Fig. 2 is a schematic top view of a connection mode of the shower pipe and the liquid distribution pipe according to an embodiment of the present invention.

Fig. 3 is a partially sectional schematic view of the shower pipe and the sleeve pipe according to the embodiment of the present invention.

In the above drawings: 1. a plate-fin heat exchanger; 2. a sedimentation tank; 3. an alkaline solution pool; 4. a circulation pump; 5. a stirrer; 6. a pH meter; 7. a filter screen; 8. a shower pipe; 9. a quick interface; 10. a hose; 11. spraying holes; 12. a sleeve; 13. a siphon tube; 14. a liquid separating pipe.

Detailed Description

As shown in fig. 1, the embodiment of the utility model discloses a cleaning device for a plate-fin heat exchanger 1, the heat exchanger has a plurality of vertically extending hot side channels and a plurality of horizontally extending cold side channels enclosed by a plurality of heat exchange plates arranged in parallel, the cleaning device comprises a liquid distributing pipe 14, a plurality of spray pipes 8, a sedimentation tank 2 and an alkali liquor tank 3 which are sequentially communicated to form a circulation; the spray pipe is pre-buried at hot side passageway top, sedimentation tank 2 is separated into two regions by filter screen 7, lye pond 3 sets up pH meter 6, install the circulating pump on the pipeline between lye pond 3 and the branch liquid pipe 14. Alkali liquor pool 3 connects branch liquid pipe 14 to each shower 8 through circulating pump 4, and cleaning solution sprays from shower 8 and strikes hot side passageway inner wall under circulating pump 4's pressure boost, and flow down along its inner wall, make cleaning solution and dirt layer reaction, then flow into sedimentation tank 2 through plate heat exchanger's hot side export, 2 middle filter screen 7 of sedimentation tank separates sedimentation tank 2 into two regions, multifilament polypropylene fiber filter cloth is chooseed for use to filter screen 7, wherein the region of filtrating is connected to alkali liquor pool 3 through siphon 13, form a circulation. The siphon 13 simplifies the structure of the whole system, reduces the use of a power device and facilitates the absorption and the reutilization of the filtrate. According to the distance between the heat exchange plates, the size of the selected spray pipe 8 is 10-20 mm in outer diameter and 6-16 mm in inner diameter.

The connection ends of the liquid separating pipe 14 and the spray pipe 8 are respectively provided with a manual ball valve, and part of the ball valves can be selectively opened or closed according to different scaling conditions in each channel during cleaning.

The used cleaning agent is configured in an alkali liquor pool 3, the cleaning solution is alkaline in an initial state, the main component is 3-5% of sodium carbonate, and in addition, 1-2% of anionic surfactant, 1-2% of emulsifier, 1-2% of dispersant, 1-5% of corrosion inhibitor and the balance of water can be added according to the requirement. The components are mixed uniformly by the stirrer 5. The solution allocation amount is 1/4 ~ 1/2 of heat exchanger hot side total volume.

As shown in fig. 2, the outlet at the hot side of the heat exchanger is opened, the liquid distribution pipe 14 is connected with one end of the spray pipe 8 through the hose 10 and the quick connector 9, the other end of the spray pipe 8 is closed, a plurality of uniformly arranged spray holes 11 are formed below the spray pipe 8, and the distance between the spray holes 11 is set to be 20-80 mm according to the size and the shape of the spray holes 11. Preferably, the spray holes 11 are arranged in a conical shape, so that the spray range of each spray hole 11 is expanded as much as possible, the number of the spray holes 11 can be reduced on the basis that spray liquid covers the whole inner wall of the hot side channel, and the impact force of the sprayed liquid on the inner wall of the hot side channel is increased.

Observe pH meter 6 numerical reading of lye pond 3, when pH is 3 ~ 5, change alkaline cleaner solution, when pH >9, change the solution in lye pond 3 for the clear water, wash the heat exchanger, when pH is 6 ~ 8, observe the 2 water inlets of sedimentation tank, when the water that comes out from the 2 water inlets of sedimentation tank is clear, when not muddy, the washing is ended. As the main component of the cleaning agent is sodium carbonate which reacts with ferric sulfate or ferrous sulfate in the scale layer, part of ferric hydroxide flocculent precipitate or colloid in the sedimentation tank 2 is difficult to filter, and a proper amount of polymeric flocculant, such as PAM, can be added into the sedimentation tank 2.

The lower part of the spray pipe 8 is clamped with a semi-cylindrical sleeve 12, so that the spray holes 11 can be prevented from being blocked when the heat exchanger works, and the upper shell is removed after the machine is stopped before cleaning, and then each sleeve 12 is taken down. Aiming at the main components of the flue gas, the sleeve 12 and the spray pipe 8 are made of 316 stainless steel materials and are corrosion resistant to a certain degree.

Preferably, the shower pipe 8 is in sliding sealing connection with the side wall of the hot side channel. The position and the angle of the spraying holes 11 can be adjusted through the sliding spraying pipe 8 according to the distribution of the scale layer, and the washing efficiency of the scale layer is improved.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a belt cleaning device of plate-fin heat exchanger, the heat exchanger has a plurality of vertical extension's that a plurality of parallel arrangement's heat transfer board encloses a plurality of vertical extension's that form hot side passageway and a plurality of level extension's cold side passageway, its characterized in that: the cleaning device comprises a liquid separating pipe, a plurality of spray pipes, a sedimentation tank and an alkali liquor tank which are sequentially communicated to form a circulation; the spray pipe is pre-buried at hot side passageway top, the sedimentation tank is separated into two regions by the filter screen, the lye pond sets up the pH meter, install the circulating pump on lye pond and the pipeline that divides between the liquid pipe.

2. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: one end of the spray pipe is closed, the other end of the spray pipe is provided with a quick connector, and the quick connector is detachably connected with a hose communicated with the liquid distribution pipe.

3. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: the spray pipe is provided with a plurality of uniformly arranged spray holes.

4. A cleaning apparatus for a plate-fin heat exchanger according to claim 3, wherein: the spraying holes are in a conical shape with a small upper part and a big lower part.

5. A cleaning device for a plate-fin heat exchanger according to claim 3 or 4, wherein: the lower part of the spraying pipe is detachably clamped with a semi-cylindrical sleeve for isolating the spraying hole.

6. The cleaning apparatus for a plate-fin heat exchanger according to claim 5, wherein: the shower pipe and the sleeve pipe are made of stainless steel.

7. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: the alkali liquor pool is provided with a stirrer.

8. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: the sedimentation tank is connected with the alkali liquor tank through a siphon.

9. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: the spray pipe is connected with the side wall of the hot side channel in a sliding and sealing mode.

10. A cleaning apparatus for a plate-fin heat exchanger according to claim 1, wherein: the connecting ends of the liquid separating pipe and the spray pipe are respectively and independently provided with a valve.