CN216447199U - MVR vapor centrifugal compressor impeller automatic cleaning system - Google Patents
MVR vapor centrifugal compressor impeller automatic cleaning system Download PDFInfo
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- CN216447199U CN216447199U CN202123167730.5U CN202123167730U CN216447199U CN 216447199 U CN216447199 U CN 216447199U CN 202123167730 U CN202123167730 U CN 202123167730U CN 216447199 U CN216447199 U CN 216447199U
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Abstract
The utility model discloses an automatic cleaning system for an MVR steam centrifugal compressor impeller, which does not need to be manually cleaned when the system is stopped. The system comprises a plate preheater, wherein the plate preheater is provided with a stock solution channel and a condensate channel, the stock solution channel is connected with a circulating pipeline, the circulating pipeline comprises a forced circulating pump, an MVR heater heated section and a separator which are sequentially connected, and the liquid end of the separator is connected with the forced circulating pump; the steam end of the separator is connected with the inlet of the compressor, the outlet of the compressor is connected with the heating section of the MVR heater, the condensed water discharge end of the heater is connected with the condensed fluid buffer tank and the condensed fluid pump, and the condensed fluid pump is connected with the condensed fluid channel of the plate preheater and the high-temperature water softening equipment; the high-temperature softened water equipment is connected with an inlet desuperheating water buffer tank and an outlet desuperheating water buffer tank, the inlet desuperheating water buffer tank is sequentially connected with an inlet desuperheating water pump, an inlet desuperheating water regulating valve and a compressor, and the outlet desuperheating water buffer tank is sequentially connected with an outlet desuperheating water pump, an outlet desuperheating water regulating valve and a compressor.
Description
Technical Field
The utility model relates to the technical field of compressors, in particular to an automatic cleaning system for an impeller of an MVR steam centrifugal compressor.
Background
The MVR system is widely applied to the industrial production fields of chemical industry, light industry, food, pharmacy, seawater desalination, sewage treatment and the like, but the problem of impeller scaling is increasingly prominent after the compressor operates for a long time. The compressor is used as the core of the MVR system, the efficiency of the compressor is directly reduced due to the scaling of an impeller of the compressor, and the dynamic balance of the impeller is influenced under a severe condition, so that the compressor is abnormally damaged due to the vibration of the compressor. In order to eliminate impeller scaling, most of the current methods are to stop the machine and disassemble an inlet pipeline for manual cleaning, and the method is time-consuming, labor-consuming and high in economic loss.
The root cause of impeller scaling is that the quality of secondary steam is unqualified or the temperature-reducing water is unqualified, the method is programmed by a programmable logic controller, and the specific temperature-reducing water is used for automatic online cleaning in the starting and stopping processes of the compressor, so that the problem of the compressor impeller scaling is solved from the source.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides an automatic cleaning system for an MVR steam centrifugal compressor impeller, which has the advantages of simple structure and convenience in use, and does not need manual cleaning during system shutdown.
The purpose of the utility model is realized as follows:
an automatic cleaning system for an MVR vapor centrifugal compressor impeller,
the system comprises a plate preheater, wherein the plate preheater is provided with a stock solution channel and a condensate channel which exchange heat with each other, the inlet end of the stock solution channel is used for introducing stock solution for heating, the outlet end of the stock solution channel is connected with a circulating pipeline through a pipeline, the circulating pipeline comprises a forced circulation pump, an MVR heater heating section and a separator which are sequentially connected through the pipeline, the liquid end of the separator is connected with the inlet end of the forced circulation pump through the pipeline, and the outlet end of the stock solution channel is connected between the liquid end of the separator and the inlet end of the circulating pump through the pipeline;
the steam end of the separator is connected with the inlet end of the compressor through a pipeline, the outlet end of the compressor is connected with the heating section of the MVR heater through a pipeline, the condensed water discharge end of the heater is sequentially connected with the condensed fluid buffer tank and the condensed fluid pump, the outlet end of the condensed fluid pump is respectively connected with the condensed fluid channel of the plate preheater and the high-temperature water softening equipment through pipelines, the outlet end of the condensed fluid channel is used for discharging condensed fluid, and the high-temperature water softening equipment is used for softening the condensed fluid;
the outlet end of the high-temperature softened water equipment is respectively connected with the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank through pipelines, the outlet end of the inlet desuperheating water buffer tank is sequentially connected with the inlet ends of the inlet desuperheating water pump, the inlet desuperheating water regulating valve and the compressor through pipelines, and the outlet end of the outlet desuperheating water buffer tank is sequentially connected with the outlet ends of the outlet desuperheating water pump, the outlet desuperheating water regulating valve and the compressor through pipelines.
Preferably, a bypass anti-surge valve is connected between the inlet end and the outlet end of the compressor through a pipeline.
Preferably, the inlet end and the outlet end of the compressor are respectively provided with a temperature measuring device and a pressure measuring device.
Preferably, the condensate buffer tank is provided with a buffer tank liquid level meter.
Preferably, a reagent feeding window is arranged on the inlet temperature-reducing water buffer tank and used for feeding chemical reagents which are beneficial to dissolving the impeller fouling substances.
Preferably, the inlet and the outlet of the high-temperature water softening equipment are both provided with valves for enabling the liquid levels of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank to be between the high liquid level and the low liquid level of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank.
An automatic cleaning method for an MVR vapor centrifugal compressor impeller,
after the stock solution is subjected to waste heat by the plate preheater, the stock solution enters a circulating pipeline and is subjected to forced circulation by a forced circulating pump;
before starting the machine, raw liquid is fed in advance through a liquid end of a separator until the liquid level is set, after the pre-feeding is finished, raw steam is introduced into a heating section of an MVR heater to heat the raw liquid to a preheating temperature, condensate generated by the MVR heater enters a condensate buffer tank, when a buffer tank liquid level meter is high, a condensate pump runs, the condensate enters a plate preheater and a high-temperature water softening device respectively, the softened condensate enters an inlet desuperheating water buffer tank and an outlet desuperheating water buffer tank respectively, after the liquid level of the inlet desuperheating water buffer tank is high, a compressor runs, when the running frequency of the compressor reaches a cleaning set frequency, the inlet desuperheating water pump runs and starts cleaning, the opening degree of an inlet desuperheating water regulating valve is regulated, the inlet temperature of the compressor is controlled to be the saturated steam temperature corresponding to the inlet pressure of the compressor, and an impeller of the compressor cleans scaling substances through the saturated steam, discharging water carried in the steam through a volute drainage device of the compressor, stopping an inlet temperature-reducing water pump after cleaning is finished, and fully closing an inlet temperature-reducing water regulating valve;
when the compressor normally operates, the compressor operates at a set operating frequency, the bypass anti-surge valve enters automatic adjustment, the outlet desuperheating water pump operates, the opening of the outlet desuperheating water adjusting valve is adjusted, the outlet temperature of the compressor is controlled to be the superheated steam temperature corresponding to the outlet pressure of the compressor, the superheated steam enters a heating section of the MVR heater through an outlet pipeline of the compressor to heat stock solution, the heated stock solution enters a separator for steam-liquid separation under the action of the forced circulation pump, and generated secondary steam enters the compressor through an inlet pipeline of the compressor to raise the temperature and boost the pressure;
when the compressor is normally shut down, the operation frequency of the compressor is reduced to the set cleaning frequency while the bypass anti-surge valve is slowly and fully opened, the outlet desuperheating water regulating valve is fully closed, the outlet desuperheating water pump is closed, the inlet desuperheating water pump operates and starts to clean, the inlet temperature of the compressor is controlled to be the saturated steam temperature corresponding to the inlet pressure of the compressor by adjusting the opening degree of the inlet desuperheating water regulating valve, after the cleaning is finished, the inlet desuperheating water pump stops, the inlet desuperheating water regulating valve is fully closed, and the compressor is shut down.
Preferably, the set value of the liquid level of the separator is the liquid level maintained by the separator after the forced circulation pump has been operated.
Preferably, for recalcitrant impeller foulants and chemical reagent components added to the inlet desuperheating water are not allowed to enter the MVR heater, a gate valve and bypass are added to the outlet port piping of the compressor for venting the spent steam after cleaning.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
1. the impeller of the compressor is cleaned when the device is started and stopped every time, and the problem of impeller scaling is not needed to be worried about. Effectively avoid causing the impeller scale deposit because of the secondary steam or the temperature reduction water quality difference, make compressor efficiency decline or damage compressor.
2. The cleaning procedure of the compressor impeller is full-automatic and simple to operate.
3. The MVR system condensed water is directly used in the desuperheating water, and the cost is saved while the quality of the desuperheating water is ensured through softening treatment.
4. Different chemical reagents can be added into an inlet temperature-reducing water buffer tank to solve the problem that secondary steam at the inlet of a compressor carries various industrial raw material components to cause impeller scaling.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of the impeller cleaning during the compressor start-up process of the present invention;
fig. 3 is a flow chart of impeller cleaning during normal compressor shutdown of the present invention.
Reference numerals
In the figure, 1 is a compressor outlet pressure measuring point, 2 is a compressor outlet temperature measuring point, 3 is a compressor outlet temperature-reducing water pipeline, 4 is a compressor outlet pipeline, 5 is a compressor inlet temperature-reducing water pipeline, 6 is a compressor volute, 7 is a compressor inlet temperature measuring point, 9 is a bypass anti-surge valve, 10 is a compressor inlet pipeline, 11 is an MVR heater, 12 is an MVR separator, 13 is a forced circulation pump, 14 is a buffer tank liquid level meter, 15 is a condensate buffer tank, 16 is a condensate pump, 17 is a plate preheater, 18 is an inlet temperature-reducing water pump, 19 is an inlet temperature-reducing water buffer tank, 20 is a reagent putting window, 21 is an outlet temperature-reducing water pump, 22 is an outlet temperature-reducing water buffer tank, 23 is a high-temperature water softening device, 24 is an outlet temperature-reducing water regulating valve, and 25 is an inlet temperature-reducing water regulating valve.
Detailed Description
Referring to fig. 1, an embodiment of an automatic cleaning system for an MVR vapor centrifugal compressor impeller is shown.
An automatic cleaning system for an MVR vapor centrifugal compressor impeller,
including plate preheater, plate preheater has the stoste passageway of interconversion, condensate passageway, and the entrance point of stoste passageway is used for letting in the stoste of heating usefulness, and the exit end of stoste passageway passes through pipe connection circulating line, circulating line is heated section, separator including force circulation pump, MVR heater that loop through the pipe connection, the liquid end of separator passes through the pipe connection force circulation pump's entry end, and the exit end of stoste passageway passes through the pipe connection between the liquid end of separator, the entry end of circulating pump.
The steam end of the separator is connected with the inlet end of the compressor through a pipeline, the outlet end of the compressor is connected with the heating section of the MVR heater and the condensed water discharging end of the heater (steam is completely changed into condensed water to be discharged after entering the heating section of the MVR heater) through pipelines to be sequentially connected with the condensate buffer tank and the condensate pump, the outlet end of the condensate pump is respectively connected with the condensate channel of the plate preheater and the high-temperature water softening equipment through pipelines, the outlet end of the condensate channel is used for discharging the condensate, and the high-temperature water softening equipment is used for softening the condensate; the condensate buffer tank is provided with a buffer tank liquid level meter.
The outlet end of the high-temperature softened water equipment is respectively connected with the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank through pipelines, the outlet end of the inlet desuperheating water buffer tank is sequentially connected with the inlet ends of the inlet desuperheating water pump, the inlet desuperheating water regulating valve and the compressor through pipelines, and the outlet end of the outlet desuperheating water buffer tank is sequentially connected with the outlet ends of the outlet desuperheating water pump, the outlet desuperheating water regulating valve and the compressor through pipelines. Be equipped with on the import desuperheating water buffer tank and put in the reagent window for put in and help the chemical reagent that impeller scale deposit dissolved, add corresponding chemical reagent to different chemical scale deposit impurities, ordinary salt scale can not add chemical reagent, makes impeller scale deposit can eliminate under the blast of saturated steam rapidly. And valves are arranged at the inlet and the outlet of the high-temperature water softening equipment and are used for enabling the liquid levels of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank to be between the high liquid level and the low liquid level of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank.
A bypass anti-surge valve is connected between the inlet end and the outlet end of the compressor through a pipeline. The inlet end and the outlet end of the compressor are respectively provided with a temperature measuring device and a pressure measuring device.
Referring to fig. 1-3, a method for automatically cleaning an impeller of an MVR vapor centrifugal compressor.
As shown in fig. 1, the stock solution is subjected to residual heat by the plate preheater 17, and then enters a circulation pipeline between the MVR heater 11 and the separator 12, and is subjected to forced circulation by the forced circulation pump 13. Before starting the machine, stoste is fed to separator 12 liquid level set value in advance, this liquid level set value is the liquid level that keeps after force circulation pump 13 operation, after the material is accomplished in advance, MVR heater 11 leads to the live steam, heat stoste to preheating temperature, the condensate that MVR heater 11 produced gets into condensate buffer tank 15, 14 high reports of buffer tank level gauge time, condensate pump 16 operation, the condensate gets into plate preheater 17 and high temperature softened water equipment 23 respectively, the condensate after the softening process gets into import desuperheating water buffer tank 19 and export desuperheating water buffer tank 22 respectively, the import of high temperature softened water equipment 23, the export all is equipped with the valve, make the liquid level of import desuperheating water buffer tank 19, export desuperheating water buffer tank 22 all be in between high liquid level, the low liquid level. And a reagent feeding window 20 is arranged at the top of the inlet temperature reduction water buffer tank 19 and is used for feeding chemical reagents which are helpful for dissolving the impeller fouling substances.
The inlet desuperheating water buffer tank 19 triggers the ready condition after the liquid level is high, and after all the chain conditions are checked to be correct, the compressor 6 operates according to the impeller cleaning flow chart in the compressor starting process shown in the figure 2. When the operation frequency of the compressor 6 reaches the cleaning frequency, the inlet temperature reduction water pump 18 operates and starts the cleaning countdown, the cleaning time can be flexibly set according to the actual working condition on site, and the inlet temperature of the compressor is controlled to be the saturated steam temperature calculated by the inlet pressure of the compressor by adjusting the opening degree of the inlet temperature reduction water adjusting valve 25. Because the inlet of the compressor is close to the impeller of the compressor 6, the humidity of the obtained saturated steam is increased, the dirt can be effectively cleaned, and water carried in the steam can be discharged through the volute drainage device of the compressor 6 without influencing the operation of equipment. After the cleaning countdown is finished, the inlet temperature-reducing water pump 18 is stopped and the inlet temperature-reducing water regulating valve 25 is fully closed, the compressor 6 runs at a set running frequency, the bypass anti-surge valve 9 enters automatic regulation, the outlet temperature-reducing water pump 21 runs, the outlet temperature of the compressor is controlled to be the slightly superheated steam temperature calculated by the outlet pressure of the compressor by regulating the opening degree of the outlet temperature-reducing water regulating valve 24, the slightly superheated steam enters the MVR heater 11 from the outlet pipeline 4 of the compressor to heat the stock solution, the heated stock solution enters the separator 12 for steam-liquid separation under the action of the forced circulation pump 13, and the generated secondary steam enters the compressor 6 from the inlet pipeline 10 of the compressor to raise the temperature and raise the pressure.
When the compressor is scheduled to be normally stopped, the compressor 6 operates according to an impeller cleaning flow chart in the normal stop process of the compressor shown in fig. 3, the compressor operation frequency is reduced to the cleaning set frequency while the bypass anti-surge valve 9 is slowly and fully opened, the outlet temperature-reducing water regulating valve 24 is fully closed, the outlet temperature-reducing water pump 21 is closed, the inlet temperature-reducing water pump 18 operates and the cleaning countdown is started, the cleaning time can be flexibly set according to the actual working condition on site, and the inlet temperature of the compressor is controlled to be the saturated steam temperature calculated by the inlet pressure of the compressor by regulating the opening degree of the inlet temperature-reducing water regulating valve 25. And when the cleaning countdown is finished, the inlet temperature-reducing water pump 18 is stopped, the inlet temperature-reducing water regulating valve 25 is completely closed, and the main motor of the compressor 6 is stopped.
When the cleaning program runs, the bypass anti-surge valve is fully opened, the compressor outlet desuperheating water regulating valve is fully closed, and the opening degree of the inlet desuperheating water regulating valve is interlocked with the saturated steam temperature corresponding to the inlet pressure of the compressor, so that the inlet steam of the compressor is in a saturated steam state. The compressor is in a low load condition and the purge frequency setting may be determined by field conditions. The impeller cleaning liquid is soft water treated by water softening equipment, and the using amount of the impeller cleaning liquid is automatically adjusted by the working condition of the compressor, so that the steam at the inlet of the compressor is in a saturated steam state in a cleaning mode.
Wherein, when chemical reagent components added to stubborn impeller scaling substances and the inlet desuperheating water are not allowed to enter the MVR heater 11, the steam at the outlet of the compressor needs to be directly emptied without participating in circulation, and a gate valve and a bypass can be added to a pipeline at the outlet of the compressor for discharging the waste steam after cleaning.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the utility model, and that, although the utility model has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the utility model as defined by the appended claims.
Claims (6)
1. The utility model provides a MVR centrifugal compressor impeller self-cleaning system which characterized in that:
the system comprises a plate preheater, wherein the plate preheater is provided with a stock solution channel and a condensate channel which exchange heat with each other, the inlet end of the stock solution channel is used for introducing stock solution for heating, the outlet end of the stock solution channel is connected with a circulating pipeline through a pipeline, the circulating pipeline comprises a forced circulation pump, an MVR heater heating section and a separator which are sequentially connected through the pipeline, the liquid end of the separator is connected with the inlet end of the forced circulation pump through the pipeline, and the outlet end of the stock solution channel is connected between the liquid end of the separator and the inlet end of the circulating pump through the pipeline;
the steam end of the separator is connected with the inlet end of the compressor through a pipeline, the outlet end of the compressor is connected with the heating section of the MVR heater through a pipeline, the condensed water discharge end of the heater is sequentially connected with the condensed fluid buffer tank and the condensed fluid pump, the outlet end of the condensed fluid pump is respectively connected with the condensed fluid channel of the plate preheater and the high-temperature water softening equipment through pipelines, the outlet end of the condensed fluid channel is used for discharging condensed fluid, and the high-temperature water softening equipment is used for softening the condensed fluid;
the outlet end of the high-temperature softened water equipment is respectively connected with the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank through pipelines, the outlet end of the inlet desuperheating water buffer tank is sequentially connected with the inlet ends of the inlet desuperheating water pump, the inlet desuperheating water regulating valve and the compressor through pipelines, and the outlet end of the outlet desuperheating water buffer tank is sequentially connected with the outlet ends of the outlet desuperheating water pump, the outlet desuperheating water regulating valve and the compressor through pipelines.
2. The system of claim 1, wherein the system further comprises: a bypass anti-surge valve is connected between the inlet end and the outlet end of the compressor through a pipeline.
3. The system of claim 1, wherein the system further comprises: the inlet end and the outlet end of the compressor are respectively provided with a temperature measuring device and a pressure measuring device.
4. The system of claim 1, wherein the system further comprises: the condensate buffer tank is provided with a buffer tank liquid level meter.
5. The system of claim 1, wherein the system further comprises: and a reagent throwing window is arranged on the inlet desuperheating water buffer tank and is used for throwing chemical reagents which are beneficial to dissolving the impeller fouling substances.
6. The system of claim 1, wherein the system further comprises: and valves are arranged at the inlet and the outlet of the high-temperature water softening equipment and are used for enabling the liquid levels of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank to be between the high liquid level and the low liquid level of the inlet desuperheating water buffer tank and the outlet desuperheating water buffer tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123167730.5U CN216447199U (en) | 2021-12-16 | 2021-12-16 | MVR vapor centrifugal compressor impeller automatic cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123167730.5U CN216447199U (en) | 2021-12-16 | 2021-12-16 | MVR vapor centrifugal compressor impeller automatic cleaning system |
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| Publication Number | Publication Date |
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| CN216447199U true CN216447199U (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123167730.5U Active CN216447199U (en) | 2021-12-16 | 2021-12-16 | MVR vapor centrifugal compressor impeller automatic cleaning system |
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| CN (1) | CN216447199U (en) |
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2021
- 2021-12-16 CN CN202123167730.5U patent/CN216447199U/en active Active
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