CN211346505U - Back washing device of plate heat exchanger in sludge cooling system - Google Patents
Back washing device of plate heat exchanger in sludge cooling system Download PDFInfo
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- CN211346505U CN211346505U CN201922063037.XU CN201922063037U CN211346505U CN 211346505 U CN211346505 U CN 211346505U CN 201922063037 U CN201922063037 U CN 201922063037U CN 211346505 U CN211346505 U CN 211346505U
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Abstract
The utility model discloses a back washing unit of plate heat exchanger in sludge cooling system installs on plate heat exchanger system, including matched with back flush pipeline, cooling water control valve, back flush pump and back flush control valve. The back flushing pipeline comprises a sludge outlet pipeline with one end communicated with the plate type heat exchanger, a pipeline with the other end communicated with the sludge biochemical tank, a sludge inlet pipeline with one end communicated with the plate type heat exchanger, and a pipeline with the other end communicated with the sludge biochemical tank. And the cooling water control valve is arranged on a back washing pipeline communicated with the sludge water outlet pipeline. The back washing pump and the back washing control valve are arranged on a back washing pipeline communicated with the sludge water outlet pipeline, and the back washing pump is positioned on a pipeline between the sludge biochemical tank and the back washing control valve. The utility model discloses the back washing unit who sets up can solve the problem that plate heat exchanger blockked up with prefiltering, reduces the number of times of unpicking and washing plate heat exchanger, reduces down time, effectively improves equipment efficiency.
Description
Technical Field
The utility model relates to a plate heat exchanger's transformation technical field, concretely relates to back washing unit of plate heat exchanger in mud cooling system.
Background
The plate heat exchanger is a new type high-efficiency heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes. Thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger is an ideal device for heat exchange of liquid-liquid and liquid-vapor. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, convenience in installation and cleaning, wide application, long service life and the like. Under the condition of the same pressure loss, the heat transfer coefficient of the heat exchanger is 3-5 times higher than that of a tubular heat exchanger, the occupied area of the heat exchanger is one third of that of the tubular heat exchanger, and the heat recovery rate can reach more than 90 percent. The plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure, light weight, small occupied space, convenient combination of area and flow, strong part universality, wide selectable materials, easy realization of large-scale production and the like, is widely applied to the fields of food, machinery, metallurgy, sewage treatment, petrochemical industry, ships and the like, and becomes a leading heat exchange device in urban centralized heat supply engineering. Blocking of the plate heat exchanger: the large-diameter particle impurities are easy to block the plate passage, the gap of the flow passage of the plate heat exchanger is small, the pressure drop of equipment is rapid, the heat exchange capacity of the equipment is greatly reduced and worsened due to blockage, and even the temperature of a cooling material is increased due to poor effect of the device.
MBR membrane biochemical reactor is a novel water treatment technical equipment that combines together by membrane separation unit and biological treatment unit, is widely used for sewage treatment plant's biochemical cooling system at present, and the heat exchanger in this equipment is MBR plate heat exchanger system, mainly carries out the heat exchange to the higher mud of temperature in the biochemical pond and the lower clear water of temperature in the cooling tower, stabilizes biochemical system operating temperature.
The existing MBR plate type heat exchanger system has the following composition and operation principle: the sludge cooling pump lifts the sludge in the biochemical tank to the MBR plate heat exchanger, and the sludge returns to the biochemical tank after passing through the MBR plate heat exchanger; meanwhile, the clear water in the cooling tower is lifted to the MBR plate heat exchanger by the cooling water pump and returns to the cooling tower after passing through the MBR plate heat exchanger, and two media with different temperatures exchange heat in the MBR plate heat exchanger, so that the purpose of cooling the sludge in the biochemical tank is achieved. One medium conveyed by the plate heat exchanger is sludge of an MBR biochemical system, the concentration of suspended solid in the sludge is high, the fluctuation of pH value is high, and the following problems can easily occur if the sludge is used for a long time without being cleaned:
(1) after the MBR plate type heat exchanger system operates for a period of time, a branch channel of the sludge conveying heat exchange plate part is blocked, the flux of the MBR plate type heat exchanger is reduced, the heat exchange efficiency is reduced, the service time of a cooling device is prolonged, and the energy consumption is increased;
(2) after the MBR plate type heat exchanger system operates for a period of time, a sludge blocking part of a flow channel of a sludge heat exchange plate is conveyed, and when the sludge blocking part is seriously corroded, the heat exchange plate is damaged, water channeling of the heat exchanger occurs, and the heat exchanger fails;
(3) according to the change of weather temperature, biochemical system cooling device needs frequent start and stop, under the condition that cooling device stops using, still have mud to pass through in the heat exchanger, because the mud medium in the heat exchanger is under the condition that stops flowing, mud can adsorb at the runner inner wall, cause the runner to block up, so even when need not cool off biochemical pond mud, still need to open the mud cooling pump and make mud flow at plate heat exchanger, ensure that mud heat exchanger fin runner is not blockked up, so both reduced heat exchanger normal life, increased the mud cooling pump again and used the power consumption.
The cleaning mode of the conventional MBR plate type heat exchanger adopts off-line cleaning, and the off-line cleaning has the following technical problems:
(1) equipment or elements need to be disassembled, the operation is complex, the safety is poor, and the cleaning cost is high;
(2) the working period is long, the working efficiency is low, the radiating fins and the sealing are easy to damage, and the service life of the heat exchanger is shortened;
(3) the operation condition that the MBR biochemical system cooling device is frequently started and stopped cannot be met;
(4) most cleaning devices need an external water source, are complex to operate and cannot realize large-water-volume reverse flushing, and ideal flushing effect is difficult to achieve.
Disclosure of Invention
The utility model aims at solving the problems of the prior art that the plate heat exchanger is offline cleaned and the cleaning steps are complex, and providing a backwashing device of a plate heat exchanger in a sludge cooling system.
The utility model discloses a realize through following technical scheme:
a backwashing device of a plate heat exchanger in a sludge cooling system is arranged on a plate heat exchanger system and comprises a backwashing pipeline, a cooling water control valve, a backwashing pump and a backwashing control valve which are matched with each other. The back flushing pipeline comprises a sludge outlet pipeline with one end communicated with the plate type heat exchanger, a pipeline with the other end communicated with the sludge biochemical tank, a sludge inlet pipeline with one end communicated with the plate type heat exchanger, and a pipeline with the other end communicated with the sludge biochemical tank. And the cooling water control valve is arranged on a back washing pipeline communicated with the sludge inlet pipeline. The back washing pump and the back washing control valve are arranged on a back washing pipeline communicated with the sludge outlet pipeline, and the back washing pump is positioned on the pipeline between the sludge biochemical tank and the back washing control valve and can pump water in the sludge biochemical tank into the plate type heat exchanger for back washing.
Further, the sludge cooling system is an MBR integrated sewage treatment system, and the plate heat exchanger is an MBR plate heat exchanger.
Furthermore, the back washing pump is a sludge reflux pump, so that the back washing pump can not suck the sludge in the sludge biochemical tank into the plate heat exchanger, and secondary blockage is avoided.
Furthermore, a security filter is arranged on a sludge inlet pipeline between the sludge biochemical tank and the sludge inlet control valve so as to reduce the occurrence of blockage of the plate heat exchanger.
Furthermore, a differential pressure sensor is arranged on a sludge outlet pipeline between the sludge outlet control valve and the plate heat exchanger. The pressure difference sensor can be used for artificially setting a threshold value, and if the pressure difference exceeds the threshold value, the plate heat exchanger is obviously blocked.
Furthermore, an alarm device is arranged on the pressure difference sensor, when the pressure difference exceeds a threshold value, an alarm is triggered, and the plate heat exchanger is reminded to be cleaned.
And the intelligent control assembly is respectively in telecommunication connection with the cooling water inlet control valve, the cold water shortage outlet control valve, the sludge inlet control valve, the cooling water control valve and the backwashing control valve and the differential pressure sensor, so that remote control can be realized.
Compared with the prior art, the utility model has the advantages of:
1. the utility model makes full use of the original MBR plate type heat exchanger system to realize efficient back washing, so that the structure is simple and compact, the manufacturing cost is low, the operation is convenient and fast, and the working efficiency is greatly improved;
2. the utility model has the advantages of no need of disassembling the equipment or elements, high safety, short operation period, no damage to the radiating fins and the seal, and prolonged service life of the heat exchanger;
3. the back washing of the utility model can be controlled to be carried out in a short time, the operation time of the system is extremely short, and the operation condition of frequent start and stop of the MBR biochemical system cooling device is extremely satisfied;
4. the utility model utilizes the clean water of the original cooling system as the washing water source for back washing, does not need external washing water, not only reduces the washing cost, achieves the minimization of the cost and the maximization of the efficiency, but also realizes the high-efficiency back washing of the sludge outlet pipeline, the MBR plate heat exchanger and the sludge inlet pipeline in sequence, has excellent washing effect, and reduces a series of risks of flow channel blockage, exchanger blockage, heat exchange failure and the like;
5. the utility model discloses the back washing unit who sets up can solve the problem that plate heat exchanger blockked up with prefiltering, reduces the number of times of unpicking and washing plate heat exchanger, reduces down time, effectively improves equipment efficiency.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 shows a plate heat exchanger and a backwashing device according to example 1.
Brief description of the drawings:
1. back flushing the pipeline; 2. a cooling water control valve; 3. a backwash pump; 4. a backwash control valve; 5. a plate heat exchanger;
61. a cooling water inlet pipe; 62. a cooling water inlet control valve; 63. A cooling water outlet pipe; 64. a cooling water outlet control valve;
71. a sludge biochemical tank; 72. a sludge inlet pipeline; 721. a cartridge filter; 722. a sludge inlet control valve; 73. a sludge outlet pipe; 731. a sludge outlet control valve; 732. differential pressure sensor
Detailed Description
Fig. 1 shows a plate heat exchanger and a backwashing device in this embodiment, where the plate heat exchanger is an MBR plate heat exchanger.
In this embodiment, the cooling water inlet and outlet pipeline and the sludge inlet and outlet pipeline are connected to the plate heat exchanger 5 and are respectively located on two sides of the plate heat exchanger 5. A cooling water inlet control valve 62 is provided on the cooling water inlet pipe 61, and a cooling water outlet control valve 64 is provided on the cooling water outlet pipe 63.
The sludge inlet pipeline 72 is provided with a sludge inlet control valve 722, and a security filter 721 is arranged on the pipeline between the sludge biochemical tank 71 and the sludge inlet control valve 722. A sludge outlet control valve 731 is arranged on the sludge outlet pipeline 73, a differential pressure sensor 732 is arranged on the pipeline between the sludge control valve 731 and the plate heat exchanger 5, and an alarm device is arranged on the differential pressure sensor 732. The pressure difference sensor 732 may be manually set to a threshold value, and if the pressure difference exceeds the threshold value, it indicates that the plate heat exchanger is significantly blocked, and an alarm is triggered to remind the plate heat exchanger to be cleaned.
The back washing device in the embodiment is arranged on a plate type heat exchanger system and comprises a back washing pipeline 1, a cooling water control valve 2, a back washing pump 3 and a back washing control valve 4 which are matched with each other.
The back flushing pipeline 1 comprises a sludge outlet pipeline 72 with one end communicated with the plate type heat exchanger 5, a pipeline with the other end communicated with the sludge biochemical tank 71, a sludge inlet pipeline 73 with one end communicated with the plate type heat exchanger 5, and a pipeline with the other end communicated with the sludge biochemical tank 71.
The cooling water control valve 2 is installed on the backwashing pipeline 1 communicated with the sludge water outlet pipeline 72.
The back washing pump 3 and the back washing control valve 4 are arranged on the back washing pipeline 1 communicated with the sludge water inlet pipeline 73, and the back washing pump 3 is positioned on a pipeline between the sludge biochemical tank 71 and the back washing control valve 4 and is used for pumping water in the sludge biochemical tank 71 into the plate type heat exchanger 5 for back washing. The back washing pump 3 in this embodiment is a sludge return pump, which ensures that the back washing pump 3 does not suck the sludge in the sludge biochemical tank 71 into the plate heat exchanger 5, so as to avoid secondary blockage.
Preferably, the apparatus of this embodiment further includes an intelligent control unit (not shown) which is respectively in telecommunication connection with the cooling water inlet control valve 62, the cold and deficient water outlet control valve 64, the sludge outlet control valve 722, the sludge inlet control valve 731, the cooling water control valve 2, the backwashing control valve 4 and the differential pressure sensor 732, so as to realize remote control.
The principle of the embodiment is as follows:
under normal conditions, when the MBR plate heat exchanger system is operated during cooling, cooling water enters the plate heat exchanger 5 through the cooling water inlet pipeline 61 and then flows out through the cooling water outlet pipeline 63. Meanwhile, the sludge flows out of the sludge biochemical tank 71, is pre-filtered by the security filter 721 on the sludge inlet pipeline 72, enters the plate heat exchanger 5, and then flows back into the sludge biochemical tank 71 through the sludge outlet pipeline 73. Since the cooling water inlet control valve 72, the cooling water outlet control valve 74, and the sludge inlet control valve 722, the sludge outlet control valve 731 are all opened, and the cooling water control valve 2 and the backwashing control valve 4 are closed, either cooling water or sludge is circulated in a normal line to perform heat exchange.
When the plate heat exchanger 5 is blocked, the alarm device of the differential pressure sensor 732 on the sludge outlet pipe 73 is triggered to remind the plate heat exchanger 5 of the need for backwashing. At this time, the operation of the plate heat exchanger system is stopped, the cooling water outlet control valve 63, the sludge inlet control valve 722, and the sludge outlet control valve 731 are closed, and the cooling water inlet control valve 62, the cooling water control valve 2, and the backwash control valve 4 are opened while the backwash pump 3 is turned on. At this time, the backwash pump 3 pumps the water in the sludge biochemical tank 71 into the plate heat exchanger 5 for backwashing, and simultaneously the cooling water flows into the sludge biochemical tank 71 through the cooling water inlet pipeline 61 and the backwash pipeline 1 to supplement the amount of water required for backwashing.
When the alarm of the differential pressure sensor 732 is released, it means that the sludge clogged on the heat exchanger 5 is washed clean. At this time, the valve is switched to a normal condition, and the plate heat exchanger 5 can normally operate.
Because the device in this embodiment is equipped with intelligent component, consequently only need control intelligent component can realize the back flush to plate heat exchanger 5, simple and convenient. The utility model discloses the back washing unit who sets up can solve the problem that plate heat exchanger blockked up with prefiltering, reduces the number of times of unpicking and washing plate heat exchanger, reduces down time, effectively improves equipment efficiency.
The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.
Claims (7)
1. A backwashing device of a plate heat exchanger in a sludge cooling system is characterized by comprising a backwashing pipeline, a cooling water control valve, a backwashing pump and a backwashing control valve which are matched with each other;
the backwashing pipeline comprises a sludge outlet pipeline with one end communicated with the plate type heat exchanger, a pipeline with the other end communicated with the sludge biochemical tank, a sludge inlet pipeline with one end communicated with the plate type heat exchanger and a pipeline with the other end communicated with the sludge biochemical tank;
the cooling water control valve is arranged on a back washing pipeline communicated with the sludge inlet pipeline;
the back-washing pump and the back-washing control valve are arranged on a back-washing pipeline communicated with the sludge outlet pipeline, and the back-washing pump is positioned on a pipeline between the sludge biochemical tank and the back-washing control valve.
2. The backwashing device of the plate heat exchanger in the sludge cooling system according to claim 1, wherein the sludge cooling system is an MBR integrated sewage treatment system, and the plate heat exchanger is an MBR plate heat exchanger.
3. The backwashing device of the plate heat exchanger in the sludge cooling system as claimed in claim 1, wherein the backwashing pump is a sludge reflux pump.
4. The backwashing device of the plate heat exchanger in the sludge cooling system as claimed in claim 1, wherein a cartridge filter is provided on a sludge inlet pipe between the sludge biochemical tank and the sludge inlet control valve.
5. The backwashing device of the plate heat exchanger in the sludge cooling system according to claim 1, wherein a differential pressure sensor is provided on a sludge outlet pipe between the sludge outlet control valve and the plate heat exchanger.
6. The backwash device for plate heat exchanger in sludge cooling system as claimed in claim 5, wherein said pressure difference sensor is provided with an alarm device.
7. The backwashing device of the plate heat exchanger in the sludge cooling system according to claim 6, further comprising an intelligent control assembly, wherein the intelligent control assembly is respectively in telecommunication connection with the cooling water inlet control valve, the cooling water outlet control valve, the sludge inlet control valve, the cooling water control valve, the backwashing control valve and the differential pressure sensor, so as to realize remote control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922063037.XU CN211346505U (en) | 2019-11-26 | 2019-11-26 | Back washing device of plate heat exchanger in sludge cooling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922063037.XU CN211346505U (en) | 2019-11-26 | 2019-11-26 | Back washing device of plate heat exchanger in sludge cooling system |
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| CN211346505U true CN211346505U (en) | 2020-08-25 |
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| CN201922063037.XU Active CN211346505U (en) | 2019-11-26 | 2019-11-26 | Back washing device of plate heat exchanger in sludge cooling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113091504A (en) * | 2021-03-24 | 2021-07-09 | 北京新能源汽车技术创新中心有限公司 | Heat exchanger cleaning method, device, control method and fuel cell cooling device |
| CN114712927A (en) * | 2022-06-06 | 2022-07-08 | 天津国投津能发电有限公司 | Backwashing filter device and backwashing method for heat exchanger of seawater desalination system |
-
2019
- 2019-11-26 CN CN201922063037.XU patent/CN211346505U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113091504A (en) * | 2021-03-24 | 2021-07-09 | 北京新能源汽车技术创新中心有限公司 | Heat exchanger cleaning method, device, control method and fuel cell cooling device |
| CN114712927A (en) * | 2022-06-06 | 2022-07-08 | 天津国投津能发电有限公司 | Backwashing filter device and backwashing method for heat exchanger of seawater desalination system |
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