Shell pass cleaning device of parallel heat exchanger

Abstract

The utility model discloses a shell pass cleaning device of a parallel heat exchanger, which relates to the technical field of heat exchanger cleaning equipment and comprises a production system, an acid washing system and a steel wire framework pipe for connecting the production system and the acid washing system. During heat exchange, a cooling water storage tank stop valve and a circulating water pump front stop valve are opened, a water inlet pipeline ball valve and a water return pipeline ball valve are closed, and a heat exchanger A up-down butterfly valve or a heat exchanger B up-down butterfly valve or a heat exchanger AB up-down butterfly valve is opened; during cleaning, a cooling water storage tank stop valve and a circulating water pump front stop valve are closed, a water inlet pipeline ball valve and a water return pipeline ball valve are opened, flange and blind plates at a main water inlet and a main water return port are automatically controlled, and upper and lower butterfly valves of a heat exchanger A or upper and lower butterfly valves of a heat exchanger B or upper and lower butterfly valves of a heat exchanger AB are opened; the purposes of heat exchange and cleaning of the heat exchanger are achieved by switching the butterfly valve, the ball valve, the flange and the stop valve of the heat exchanger, resource waste during cleaning is effectively avoided, and the working intensity of workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger cleaning equipment, in particular to a shell side cleaning device for a parallel heat exchanger. Background Art

[0002] Most of the heat exchangers are tap water heat exchangers. When the heat exchanger is used for a long time, the circulating cooling water contains a large amount of calcium and magnesium ions, which will form Mg(OH)2, CaCO3, CaSO4 and MgCO3 scale, and the carbon steel shell will also rust to form Fe2O3. These dirt impurities will be deposited on the heat transfer surface, greatly reducing the heat transfer coefficient and affecting the heat transfer efficiency. Therefore, the shell of the heat exchanger must be cleaned regularly. The difficulty of cleaning increases rapidly with the increase of the thickness of the scale layer, so the cleaning time interval should not be too long, and try to clean it once a year. Heat transfer coefficient K = 1 / (1 / αi+Rsi+δ / β+Rso+1 / αo) where αi is the heat transfer resistance of the tube layer fluid, αo is the heat transfer resistance of the cooling water of the shell layer, δ / β is the heat transfer resistance of the pipe material, Rsi is the heat transfer resistance of the inner wall of the tube, and Rso is the heat transfer resistance of the outer wall of the tube (shell heat transfer resistance). It can be clearly seen from the above formula that for the heat exchanger, the tube diameter and material are fixed, so δ / β is constant, αi and αo are also constant, and these three data have little effect on the heat transfer coefficient. Rsi and Rso have a greater impact on the heat transfer coefficient, so the heat exchanger shell Rso should also be cleaned regularly.

[0003] The existing published patent document publication number is CN217250966U and is named "A Cooler Cleaning Device". The device can clean the installed cooler anytime and anywhere, but cannot clean multiple heat exchangers connected in parallel one by one.

[0004] The existing published patent document publication number is CN102818478B and is titled "Cleaning Method for Air Conditioner Surface Cooler in Cigarette Factory". The device achieves efficient cleaning and simple operation, but requires heating of the cleaning liquid, which wastes energy. Utility Model Content

[0005] The utility model aims to provide a shell cleaning device for a parallel heat exchanger, so as to solve the problems that the existing cleaning equipment proposed in the above background technology cannot clean multiple heat exchangers connected in parallel one by one, or wastes energy by heating the cleaning liquid.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a shell cleaning device for a parallel heat exchanger, comprising a production system and a pickling system, wherein the production system is a shell cooling circulating water for a normal heat exchanger, and the pickling system is an external pickling liquid for the shell of the heat exchanger to be cleaned; the production system and the pickling system are connected by a steel wire skeleton pipe; the production system comprises a cooling water storage tank, the cooling water storage tank is connected to a cooling water storage tank front stop valve through a pipeline near the bottom, and is connected to a circulating water pump through the cooling water storage tank front stop valve, the outlet end of the circulating water pump is connected to the circulating water pump front stop valve and the total water inlet flange in sequence through a pipeline, the outlet end pipeline of the total water inlet flange is divided into two, one of which is connected to heat exchanger A through a butterfly valve on the lower side of heat exchanger A and connected to the lower side, and the other is connected to the lower side of the shell of heat exchanger A; the lower side of the shell of heat exchanger A is connected to heat exchanger B through a pipeline and a butterfly valve on the lower side of heat exchanger B and is connected to the lower side of heat exchanger B The upper side of the heat exchanger B is connected to the upper side of the shell side of the heat exchanger A through a pipeline and a butterfly valve on the upper side of the heat exchanger B; the inner upper side of the heat exchanger A is connected to the butterfly valve on the upper side of the heat exchanger A through a pipeline, the upper side of the shell side of the heat exchanger A is connected to a water outlet pipeline and merged with the pipeline on the rear side of the butterfly valve on the upper side of the heat exchanger A, and is connected to a total return water flange, and the pipeline on the rear side of the total return water flange is connected to a cooling water storage tank; the pickling system includes an acid circulation tank, and the lower side of the acid circulation tank is connected to the cooling water storage tank through a pipeline. The pipeline is connected with a pickling pump, and the outlet end of the pickling pump is connected with a ball valve at the outlet of the pickling pump and a soft-connecting ball valve at the water inlet and outlet of the pickling system in sequence through a pipeline, and then connected to the main pipeline on the rear side of the flange at the total water inlet; the main pipeline at the inlet end of the flange at the total return water is connected with an acid circulation pipeline through a tee, and a ball valve at the soft connection of the return water of the pickling system and a ball valve at the return water of the pickling system are connected to the acid circulation pipeline in sequence, and the pipeline at the outlet end of the ball valve at the return water of the pickling system is connected to the acid circulation tank.

[0007] Preferably, during heat exchange, open the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, close the ball valve at the soft connection of the return water inlet of the pickling system and the soft connection ball valve of the pickling system water inlet and outlet, open the upper butterfly valve of heat exchanger A and the lower butterfly valve of heat exchanger A, or the upper butterfly valve of heat exchanger B and the lower butterfly valve of heat exchanger B, or the upper butterfly valve of heat exchanger A, the lower butterfly valve of heat exchanger A, the upper butterfly valve of heat exchanger B and the lower butterfly valve of heat exchanger B.

[0008] Preferably, during cleaning, close the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, open the ball valve at the soft connection of the pickling system return water and the soft connection ball valve of the pickling system inlet and outlet, add blind plates to the flange at the total return water and the flange at the total water inlet, open the upper butterfly valve of heat exchanger A and the lower butterfly valve of heat exchanger A, or the upper butterfly valve of heat exchanger B and the lower butterfly valve of heat exchanger B, or the upper butterfly valve of heat exchanger A, the lower butterfly valve of heat exchanger A, the upper butterfly valve of heat exchanger B and the lower butterfly valve of heat exchanger B.

[0009] Preferably, blind plates are added at the flange at the total water return point and the flange at the total water inlet point, and the size of the blind plate matches the size of the flange.

[0010] Preferably, the pickling pump is a fluorine-lined centrifugal pump.

[0011] Preferably, the acid liquid circulation tank is made of PPH.

[0012] Preferably, the steel wire skeleton tube is made of corrosion-resistant rubber.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By adopting the above technical solution, the heat exchanger can be used alone, multiple heat exchangers can be mixed, a single heat exchanger can be used to clean the shell side, and multiple heat exchangers can be cleaned at the same time. The operation is simple and heating is not required. The workload of the staff is reduced and the production efficiency is improved. The utility model has the advantages of simple structure, convenient maintenance, low processing cost and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the process of the utility model;

[0016] In the figure: 1. Butterfly valve on the upper side of heat exchanger A, 2. Butterfly valve on the upper side of heat exchanger B, 3. Butterfly valve on the lower side of heat exchanger A, 4. Butterfly valve on the lower side of heat exchanger B, 5. Ball valve at the soft connection of the pickling system return water, 6. Ball valve at the soft connection of the pickling system inlet and outlet, 7. Flange at the total return water, 8. Flange at the total inlet, 9. Stop valve of the cooling water tank, 10. Stop valve before the circulating water pump, 11. Ball valve at the return water of the pickling system, 12. Ball valve at the outlet of the pickling pump. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution in the embodiments of the present utility model is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0018] The utility model provides a shell cleaning device for a parallel heat exchanger, including a production system and a pickling system. The production system is a normal heat exchanger with cooling circulating water passing through the shell, and the pickling system is an external pickling liquid for cleaning the shell of the heat exchanger. The production system and the pickling system are connected by a steel wire skeleton pipe. By switching the heat exchanger butterfly valve, ball valve, flange and stop valve, the use of a single heat exchanger, mixed use of multiple heat exchangers, cleaning of the shell of a single heat exchanger and simultaneous cleaning of multiple shells can be achieved. When adding a blind plate to the flange of the production system, a blind plate of the appropriate size must be used. The pickling pump of the pickling system should be a fluorine-lined centrifugal pump. The material of the acid circulation tank of the pickling system should be PPH. The steel wire skeleton pipe is made of corrosion-resistant rubber.

[0019] The production system includes a cooling water tank, which is connected to a circulating water pump near the bottom through a pipeline and a cooling water tank stop valve 9. The outlet end of the circulating water pump is connected to a circulating water pump front stop valve 10 and a total water inlet flange 8 in sequence through a pipeline. The outlet end pipeline of the total water inlet flange 8 is divided into two, one of which is connected to the heat exchanger A through a butterfly valve 3 at the lower side of the heat exchanger A and connected to the lower side, and the other pipeline is connected to the lower side of the shell side of the heat exchanger A; the lower side of the shell side of the heat exchanger A is connected to the heat exchanger A through a butterfly valve 3 at the lower side of the heat exchanger A. The pipeline and the butterfly valve 4 on the lower side of the heat exchanger B are connected to the heat exchanger B and are connected to the lower side of the heat exchanger B. The upper side of the heat exchanger B is connected to the upper side of the shell of the heat exchanger A through the pipeline and the butterfly valve 2 on the upper side of the heat exchanger B. The inner upper side of the heat exchanger A is connected to the butterfly valve 1 on the upper side of the heat exchanger A through the pipeline, the upper side of the shell of the heat exchanger A is connected to the outlet pipeline and merged with the pipeline on the rear side of the butterfly valve 1 on the upper side of the heat exchanger A, and is connected to the total return water flange 7. The pipeline on the rear side of the total return water flange 7 is connected to the cooling water storage tank.

[0020] The pickling system includes an acid circulation tank, the lower side of which is connected to a pickling pump through a pipeline, the outlet end of the pickling pump is sequentially connected to a ball valve 12 at the outlet of the pickling pump and a soft-connecting ball valve 6 for the pickling system inlet and outlet through a pipeline, and then connected to the main pipeline on the rear side of the flange 8 at the total water inlet; the main pipeline at the inlet end of the flange 7 at the total return water is connected to an acid circulation pipeline through a tee, and a ball valve 5 at the soft-connecting point of the pickling system return water and a ball valve 11 at the pickling system return water are sequentially connected to the acid circulation pipeline, and the pipeline at the outlet end of the ball valve 11 at the return water of the pickling system is connected to the acid circulation tank.

[0021] When using heat exchanger A alone, open the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, close the ball valves of the water inlet and return pipelines, and open the upper and lower butterfly valves of heat exchanger A at the same time to exchange heat in the system.

[0022] When using heat exchanger B alone, open the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, close the ball valves of the water inlet and return pipelines, and open the upper and lower butterfly valves of heat exchanger B at the same time to exchange heat in the system.

[0023] When using heat exchangers A and B at the same time, open the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, close the ball valves of the water inlet and return pipelines, and open the upper and lower butterfly valves of heat exchanger A and the upper and lower butterfly valves of heat exchanger B to exchange heat for the system.

[0024] When cleaning heat exchanger A, close the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, open the ball valves of the water inlet and return lines, and automatically control the flanges and blind plates at the total water inlet and total return. At the same time, open the upper and lower butterfly valves of heat exchanger A, and the pickling liquid circulates back and forth in the heat exchanger. The cycle lasts about 30 minutes, and the cleaning is considered complete.

[0025] When cleaning heat exchanger B, close the stop valve of the cooling water tank and the stop valve in front of the circulating water pump, open the ball valves of the water inlet and return lines, and automatically control the flanges and blind plates at the total water inlet and total return. At the same time, open the upper and lower butterfly valves of heat exchanger B, and the pickling liquid circulates back and forth in the heat exchanger. The cycle lasts about 30 minutes, and the cleaning is considered complete.

[0026] When cleaning heat exchanger A and heat exchanger B at the same time, close the stop valve of the cooling water storage tank and the stop valve in front of the circulating water pump, open the ball valves of the water inlet and return lines, and automatically control the flanges and blind plates at the total water inlet and total return. At the same time, open the upper and lower butterfly valves of heat exchanger A and heat exchanger B, and the pickling liquid circulates back and forth in the heat exchanger. The cycle lasts about 30 minutes, and the cleaning is considered complete.

[0027] Although the embodiments of the utility model have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, it can be understood by ordinary technicians in this field that all other embodiments obtained by making various changes, modifications, substitutions and variations to these embodiments without departing from the principle and spirit of the utility model and without making creative work, all belong to the scope of protection of the utility model.

Claims

1. A shell side cleaning device for a parallel heat exchanger, characterized in that: The invention comprises a production system and a pickling system, wherein the production system is a normal heat exchanger shell side through which cooling circulating water is passed, and the pickling system is an external pickling liquid for cleaning the heat exchanger shell side; the production system and the pickling system are connected through a steel wire skeleton pipe; the production system comprises a cooling water storage tank, and the cooling water storage tank is connected to a circulating water pump through a pipeline near the bottom and a cooling water storage tank stop valve (9), and the outlet end of the circulating water pump is connected to a circulating water pump front stop valve (10), a total water inlet valve (11) and a cooling water pump stop valve (12) in sequence through a pipeline. The flange (8) at the main water inlet flange (8) is divided into two pipes at the outlet end of which one pipe is connected to the heat exchanger A through the butterfly valve (3) at the lower side of the heat exchanger A and connected to the lower side of the interior, and the other pipe is connected to the lower side of the shell side of the heat exchanger A; the lower side of the shell side of the heat exchanger A is connected to the heat exchanger B through the pipe and the butterfly valve (4) at the lower side of the heat exchanger B and connected to the lower side of the heat exchanger B, and the upper side of the heat exchanger B is connected to the upper side of the shell side of the heat exchanger A through the pipe and the butterfly valve (2) at the upper side of the heat exchanger B. side; the inner upper side of the heat exchanger A is connected to the butterfly valve (1) on the upper side of the heat exchanger A through a pipeline; the shell side upper side of the heat exchanger A is connected to a water outlet pipeline and merged with the pipeline on the rear side of the butterfly valve (1) on the upper side of the heat exchanger A, and is connected to a total return water flange (7); the pipeline on the rear side of the total return water flange (7) is connected to a cooling water storage tank; the pickling system includes an acid circulation tank, the lower side of the acid circulation tank is connected to a pickling pump through a pipeline, and the outlet end of the pickling pump is connected to the cooling water storage tank through a pipeline in sequence The ball valve (12) at the outlet of the pickling pump and the soft-connecting ball valve (6) at the water inlet and outlet of the pickling system are connected and then connected to the main pipeline at the rear side of the flange (8) at the total water inlet; the main pipeline at the inlet end of the flange (7) at the total water return is connected to an acid circulation pipeline through a tee, and the ball valve (5) at the soft-connecting point of the pickling system water return and the ball valve (11) at the water return of the pickling system are connected to the acid circulation pipeline in sequence, and the pipeline at the outlet end of the ball valve (11) at the water return of the pickling system is connected to the acid circulation tank.

2. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: During heat exchange, open the stop valve (9) of the cooling water tank and the stop valve (10) in front of the circulating water pump, close the ball valve (5) at the soft connection of the pickling system return water and the ball valve (6) at the soft connection of the pickling system water inlet and outlet, open the upper butterfly valve (1) of heat exchanger A and the lower butterfly valve of heat exchanger A, or the upper butterfly valve (2) of heat exchanger B and the lower butterfly valve (4) of heat exchanger B, or the upper butterfly valve (1) of heat exchanger A, the lower butterfly valve of heat exchanger A, the upper butterfly valve (2) of heat exchanger B and the lower butterfly valve (4) of heat exchanger B.

3. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: During cleaning, close the stop valve (9) of the cooling water tank and the stop valve (10) in front of the circulating water pump, open the ball valve (5) at the soft connection of the pickling system return water and the ball valve (6) at the soft connection of the pickling system water inlet and outlet, add blind plates to the flange (7) at the total return water and the flange (8) at the total water inlet, open the upper butterfly valve (1) of heat exchanger A and the lower butterfly valve of heat exchanger A, or the upper butterfly valve (2) of heat exchanger B and the lower butterfly valve (4) of heat exchanger B, or the upper butterfly valve (1) of heat exchanger A, the lower butterfly valve of heat exchanger A, the upper butterfly valve (2) of heat exchanger B and the lower butterfly valve (4) of heat exchanger B.

4. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: Blind plates are added at the flange (7) at the total water return point and the flange (8) at the total water inlet point, and the size of the blind plates matches the size of the flanges.

5. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: The pickling pump is a fluorine-lined centrifugal pump.

6. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: The acid liquid circulation tank is made of PPH.

7. The shell side cleaning device of the parallel heat exchanger according to claim 1, characterized in that: The steel wire skeleton tube is made of corrosion-resistant rubber.

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