CN220982051U - Backwashing device of shell-and-tube heat exchanger - Google Patents

Abstract

The utility model belongs to the technical field of heat exchanger cleaning, specifically a backwashing device for a shell and tube heat exchanger, comprising a shell and tube heat exchanger, a heat exchanger inlet pipeline and a heat exchanger outlet pipeline, wherein the heat exchanger inlet pipeline is connected with the inlet of the first sub-line of the heat exchanger and the inlet of the second sub-line of the heat exchanger, and the heat exchanger outlet pipeline is connected with the outlet of the first sub-line and the outlet of the second sub-line of the heat exchanger; during backwashing, the heat exchange medium in the heat exchanger inlet pipeline passes through the inlet and outlet of the first sub-line of the heat exchanger, the heat exchanger outlet pipeline, the shell and tube heat exchanger, the heat exchanger inlet pipeline, the inlet and outlet of the second sub-line of the heat exchanger, and the heat exchanger outlet pipeline in sequence to form a reverse flow for flushing. The utility model achieves backwashing by switching the medium flow direction when the shell and tube heat exchanger is online for a long time.

Description

Backwashing device for shell and tube heat exchanger

Technical Field

The utility model belongs to the technical field of heat exchanger cleaning, and in particular relates to a backwashing device for a tube shell heat exchanger.

Background technique

Shell and tube heat exchangers are heat exchange equipment frequently used in the fields of heating, air conditioning, refrigeration and chemical industry. Generally, the medium flowing in the heat exchange tubes of the heat exchanger is water. Generally, the medium flowing in the heat exchange tube shell of the heat exchanger is prone to scaling and clogging due to the presence of debris when the temperature is high. Therefore, after the heat exchanger has been running for a long time, dirt and scaling will accumulate in the heat exchanger, which not only increases the resistance of the system and equipment, increases the energy consumption of the water pump, but also increases the scale thermal resistance of the heat exchanger, affecting the heat transfer effect.

The most commonly used treatment method at present is to disassemble and clean the heat exchanger offline, which seriously interferes with the normal use of the heat exchange system, increases cleaning costs, and brings safety risks and medium leakage risks during manual operations. It also affects the service life of the plate heat exchanger due to repeated disassembly. Therefore, the utility model provides a backwashing device that can achieve the purpose of backwashing by switching the medium flow direction under long-term operation.

Utility Model Content

In view of the above-mentioned deficiencies of the prior art, the utility model provides a backwashing device for a shell and tube heat exchanger, which solves the problem that the heat exchanger needs to be shut down for offline disassembly and cleaning. Backwashing is achieved by switching the medium flow direction when the shell and tube heat exchanger is online for a long time.

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

The utility model aims to provide a backwashing device for a shell and tube heat exchanger, comprising a shell and tube heat exchanger, a heat exchanger inlet pipeline and a heat exchanger outlet pipeline, wherein the heat exchanger inlet pipeline is connected with an inlet of a first sub-line of the heat exchanger and an inlet of a second sub-line of the heat exchanger, and the heat exchanger outlet pipeline is connected with an outlet of the first sub-line and an outlet of the second sub-line of the heat exchanger;

Under normal heat exchange conditions, the heat exchange medium in the heat exchanger inlet pipeline passes through the shell and tube heat exchanger and the heat exchanger outlet pipeline in sequence; during backwashing, the heat exchange medium in the heat exchanger inlet pipeline passes through the inlet and outlet of the first sub-line of the heat exchanger, the heat exchanger outlet pipeline, the shell and tube heat exchanger, the heat exchanger inlet pipeline, the inlet and outlet of the second sub-line of the heat exchanger, and the heat exchanger outlet pipeline in sequence to form flushing.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, according to the flow direction of the heat medium in the heat exchanger inlet pipeline, the first sub-line inlet is located in front of the second sub-line inlet of the heat exchanger, and a heat exchanger inlet valve is provided on the heat exchanger inlet pipeline, between the inlet of the first sub-line of the heat exchanger and the inlet of the second sub-line of the heat exchanger.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, according to the flow direction of the heat medium in the heat exchanger inlet pipeline, the first sub-line outlet is located in front of the second sub-line outlet of the heat exchanger, and a heat exchanger second outlet valve is provided on the heat exchanger outlet pipeline, which is located between the outlet of the first sub-line of the heat exchanger and the outlet of the second sub-line of the heat exchanger.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, a first sub-line valve of the heat exchanger is provided on the first sub-line of the heat exchanger, a booster pump is also provided on the first sub-line of the heat exchanger, and the booster pump is arranged between the first sub-line valve and the second outlet valve of the heat exchanger.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, a heat exchanger second sub-line valve is provided on the heat exchanger second sub-line.

Preferably, the shell and tube heat exchanger backwashing device is located between the outlet of the shell and tube heat exchanger and the outlet of the first sub-line of the heat exchanger, and a first outlet valve of the heat exchanger is also provided on the heat exchanger outlet pipeline.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, the heat exchanger inlet pipeline and the first sub-line and the second sub-line of the heat exchanger are detachably connected via a first three-way pipe, and the heat exchanger outlet pipeline and the first sub-line and the second sub-line of the heat exchanger are detachably connected via a second three-way pipe.

Preferably, the shell and tube heat exchanger backwashing device is located behind the first bypass valve, and the first bypass line of the heat exchanger is connected to a water tank, the water tank is used to hold flushing liquid, and a water inlet and a drug addition port are provided on the water tank, and a liquid inlet valve is also provided on the water tank.

Preferably, in the above-mentioned shell and tube heat exchanger backwashing device, a heater is also provided on the water tank.

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

The utility model uses the first sub-line and the second sub-line of the heat exchanger to achieve backwashing by switching the medium flow direction when the shell heat exchanger is online for a long time. Through the reverse flow of the medium, the heat exchanger can achieve self-flushing operation, saving resources and financial consumption caused by special cleaning. The self-flushing operation is performed by switching the medium flow direction online, avoiding the operating conditions of a single heat exchanger and reducing the risk of single heat exchanger operation after a heat exchanger is offline. After long-term operation, the shell heat exchanger is backwashed by the flushing liquid in the water tank to improve the flushing and cleaning quality of the shell heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a shell heat exchanger backwashing device of the present invention;

Description of reference numerals:

1. Heat exchanger inlet pipeline, 2. Heat exchanger outlet pipeline, 3. Heat exchanger first bypass line, 4. Heat exchanger second bypass line, 5. Heat exchanger inlet valve, 6. Heat exchanger first outlet valve, 7. Heat exchanger second outlet valve, 8. Heat exchanger first bypass line valve, 9. Heat exchanger second bypass line valve, 10. Shell and tube heat exchanger, 11. Shut-off valve.

Detailed ways

In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

The utility model provides a backwashing device for a shell and tube heat exchanger, as shown in FIG1, comprising a shell and tube heat exchanger 10, a heat exchanger inlet pipeline 1 and a heat exchanger outlet pipeline 2, wherein the heat exchanger inlet pipeline 1 is connected with an inlet of a first sub-line 3 of the heat exchanger and an inlet of a second sub-line 4 of the heat exchanger, and according to the flow direction of the heat medium in the heat exchanger inlet pipeline 1, the inlet of the first sub-line 3 is located in front of the inlet of the second sub-line 4 of the heat exchanger; the heat exchanger outlet pipeline 2 is connected with an outlet of the first sub-line 3 and an outlet of the second sub-line 4 of the heat exchanger, and according to the flow direction of the heat medium in the heat exchanger inlet pipeline 1, the outlet of the first sub-line 3 is located in front of the outlet of the second sub-line 4 of the heat exchanger; ... 4, a heat exchanger inlet valve 5 is provided on the heat exchanger inlet pipeline 1, and a heat exchanger second outlet valve 7 is provided on the heat exchanger outlet pipeline 2 between the outlet of the first sub-line 3 of the heat exchanger and the outlet of the second sub-line 4 of the heat exchanger. Under normal heat exchange state, the heat exchanger inlet valve 5 and the second outlet valve 7 are opened, and the heat exchange medium in the heat exchanger inlet pipeline 1 passes through the shell and tube heat exchanger 10 and the heat exchanger outlet pipeline 2 in sequence; during backwashing, the heat exchanger inlet valve 5 and the second outlet valve 7 are closed, and the heat exchange medium in the heat exchanger inlet pipeline 1 passes through the inlet and outlet of the first sub-line 3 of the heat exchanger, the heat exchanger outlet pipeline 2, the shell and tube heat exchanger 10, the heat exchanger inlet pipeline 1, the inlet and outlet of the second sub-line 4 of the heat exchanger, and the heat exchanger outlet pipeline 2 in sequence to form flushing.

The first sub-line 3 of the heat exchanger is provided with a first sub-line valve 8 of the heat exchanger, and the first sub-line 3 of the heat exchanger is also provided with a booster pump, and the booster pump is arranged between the first sub-line valve 8 and the second outlet valve 7 of the heat exchanger; the second sub-line 4 of the heat exchanger is provided with a second sub-line valve 9 of the heat exchanger. In the normal heat exchange state, the first sub-line valve 8 and the second sub-line valve 9 of the heat exchanger are both in the closed state, and when backwashing is performed, the first sub-line valve 8 and the second sub-line valve 9 of the heat exchanger are both in the open state.

A heat exchanger first outlet valve 6 is also provided on the heat exchanger outlet pipeline 2 between the outlet of the shell and tube heat exchanger 10 and the outlet of the first sub-line 3 of the heat exchanger. In the normal heat exchange state and when backwashing, the heat exchanger first outlet valve 6 is in an open state. The heat exchanger inlet valve 5, the heat exchanger first outlet valve 6, the heat exchanger second outlet valve 7, the heat exchanger first sub-line valve 8, and the heat exchanger second sub-line valve 9 are all butterfly valves.

The heat exchanger inlet pipeline 1 and the first and second sub-lines 3 and 4 of the heat exchanger are all detachably connected via a first three-way pipe, and the heat exchanger outlet pipeline 2 and the first and second sub-lines 3 and 4 of the heat exchanger are all detachably connected via a second three-way pipe.

A water tank is connected to the first sub-line 3 of the heat exchanger behind the first sub-line valve 8. The water tank is used to hold flushing liquid. The water tank is provided with a water inlet and a dosing port, and is also provided with a liquid inlet valve. The flushing liquid in the water tank is used to flush the scale after the shell heat exchanger has been running for a long time. A discharge pipe is also provided between the second sub-line valve 9 of the heat exchanger and the inlet of the heat exchanger outlet pipeline 2. The discharge pipe is also provided with a waste liquid outlet valve to discharge the flushing waste liquid. A shut-off valve 11 is also provided on the second sub-line 4 of the heat exchanger, between the inlet of the discharge pipe and the outlet of the second sub-line 4 of the heat exchanger. A heater is also provided on the water tank, and the heater is used to heat the flushing liquid in the water tank. The heater heats the flushing liquid, which can improve the cleaning effect and cleaning efficiency of the shell heat exchanger 1.

Working principle: Under normal heat exchange state, open the heat exchanger inlet valve 5 and the second outlet valve 7 as well as the heat exchanger first outlet valve 6, and the heat exchange medium in the heat exchanger inlet pipeline 1 passes through the shell and tube heat exchanger 10 and the heat exchanger outlet pipeline 2 in turn. The heat exchanger inlet valve 5, the second outlet valve 7 and the heat exchanger first outlet valve 6 can control the flow rate of the heat exchange medium in the heat exchanger inlet pipeline 1 entering the shell and tube heat exchanger 10 and the heat exchanger outlet pipeline 2; when backwashing is required, close the heat exchanger inlet valve 5, the heat exchanger second outlet valve 7 and the liquid inlet valve on the water tank, open the heat exchanger first sub-line valve 8, the heat exchanger first outlet valve 6 and the heat exchanger second sub-line valve 9. Shut-off valve 11. The heat exchange medium in the heat exchanger inlet pipeline 1 enters the inlet and outlet of the first sub-line 3 of the heat exchanger, the shell and tube heat exchanger 10, the heat exchanger inlet pipeline 1, and then enters the inlet of the second sub-line 4 of the heat exchanger. It enters the outlet of the second sub-line 4 of the heat exchanger and finally flows out of the heat exchanger outlet pipeline 2. The shell and tube heat exchanger 10 is online for a long time to switch the medium flow direction to achieve backwashing. The flow rate of the heat exchange medium can be adjusted by the first sub-line valve 8, the first outlet valve 6 of the heat exchanger and the second sub-line valve 9 of the heat exchanger. At the same time, the booster pump can be turned on to increase the flow pressure of the heat exchange medium to achieve self-flushing operation.

After the shell heat exchanger 10 is backwashed for a long time by switching the medium flow direction, it is necessary to further clean the scale in the heat exchanger. At this time, close the heat exchanger inlet valve 5, the heat exchanger first bypass line valve 8, the heat exchanger second outlet valve 7 and the shut-off valve 11, open the heat exchanger first outlet valve 6 and the heat exchanger second bypass line valve 9, the waste liquid outlet valve, open the liquid inlet valve and the booster pump, and use the booster pump to make the flushing liquid in the water tank flow into the heat exchanger first bypass line 3, the shell and tube heat exchanger 10 and the heat exchanger second bypass line 4 in turn, and then flow out through the waste liquid outlet valve. After a long period of operation, the shell heat exchanger is backwashed with the flushing liquid in the water tank to improve the flushing and cleaning quality of the shell heat exchanger.

It should be noted that the component connection relationships not specifically mentioned in the present invention are all assumed to adopt the existing technology. Since they do not involve the invention point and are widely used in the existing technology, the structural connection relationships are not described in detail.

It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes the preferred embodiments. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (9)

1. The shell-and-tube heat exchanger back flushing device comprises a shell-and-tube heat exchanger (10), a heat exchanger inlet pipeline (1) and a heat exchanger outlet pipeline (2), and is characterized in that an inlet of a first auxiliary line (3) of the heat exchanger and an inlet of a second auxiliary line (4) of the heat exchanger are communicated on the heat exchanger inlet pipeline (1), and an outlet of the first auxiliary line (3) and an outlet of the second auxiliary line (4) of the heat exchanger are communicated on the heat exchanger outlet pipeline (2);

In a normal heat exchange state, heat exchange media in an inlet pipeline (1) of the heat exchanger sequentially pass through a shell-and-tube heat exchanger (10) and an outlet pipeline (2) of the heat exchanger; during back flushing, heat exchange medium in the inlet pipeline (1) of the heat exchanger sequentially flows in reverse direction through the inlet and the outlet of the first auxiliary line (3) of the heat exchanger, the outlet pipeline (2) of the heat exchanger, the shell-and-tube heat exchanger (10), the inlet pipeline (1) of the heat exchanger, the inlet and the outlet of the second auxiliary line (4) of the heat exchanger and the outlet pipeline (2) of the heat exchanger.

2. A shell and tube heat exchanger backwash assembly according to claim 1, characterised in that the inlet of the first sub-line (3) is located in front of the inlet of the second sub-line (4) of the heat exchanger, between the inlet of the first sub-line (3) of the heat exchanger and the inlet of the second sub-line (4) of the heat exchanger, depending on the direction of flow of the heat medium in the inlet line (1) of the heat exchanger, a heat exchanger inlet valve (5) being provided in the inlet line (1) of the heat exchanger.

3. A shell and tube heat exchanger backwash assembly according to claim 1, characterised in that the outlet of the first sub-line (3) is located in front of the outlet of the second sub-line (4) of the heat exchanger, between the outlet of the first sub-line (3) of the heat exchanger and the outlet of the second sub-line (4) of the heat exchanger, depending on the direction of flow of the heat medium in the inlet line (1) of the heat exchanger, a second outlet valve (7) of the heat exchanger being provided in the outlet line (2) of the heat exchanger.

4. The shell-and-tube heat exchanger backwash device according to claim 1, wherein the heat exchanger first sub-line (3) is provided with a heat exchanger first sub-line valve (8), the heat exchanger first sub-line (3) is further provided with a booster pump, and the booster pump is arranged between the first sub-line valve (8) and the heat exchanger second outlet valve (7).

5. The shell-and-tube heat exchanger backwash device according to claim 1, wherein the heat exchanger second sub-line (4) is provided with a heat exchanger second sub-line valve (9).

6. A shell-and-tube heat exchanger backwash device according to claim 1, characterised in that a heat exchanger first outlet valve (6) is also provided on the heat exchanger outlet line (2) between the outlet of the shell-and-tube heat exchanger (10) and the outlet of the heat exchanger first sub-line (3).

7. The shell-and-tube heat exchanger backwashing device according to claim 1, wherein the heat exchanger inlet pipeline (1) is detachably communicated with the heat exchanger first auxiliary line (3) and the heat exchanger second auxiliary line (4) through a first three-way pipe, and the heat exchanger outlet pipeline (2) is detachably communicated with the heat exchanger first auxiliary line (3) and the heat exchanger second auxiliary line (4) through a second three-way pipe.

8. The back flushing device of a shell-and-tube heat exchanger according to claim 4, wherein a water tank is communicated with the first auxiliary line (3) of the heat exchanger and is positioned behind the first auxiliary line valve (8), the water tank is used for containing flushing liquid, a water inlet and a dosing port are arranged on the water tank, and a liquid inlet valve is also arranged on the water tank.

9. The shell and tube heat exchanger backwash assembly as set forth in claim 8, wherein a heater is further provided on the tank.