CN108757586A - The online impeller cleaning system and method for centrifugal air compressor in a kind of air separation unit - Google Patents

Abstract

An online impeller cleaning system and method for a centrifugal air compressor in an air separation unit. The system is mainly composed of a stainless steel water tank, a cleaning water pump, a control valve, a check valve, a pressure gauge, a flow meter, a pipeline and a nozzle. The cleaning water pump is connected to the stainless steel water tank through pipelines, and the control valve, pressure gauge and flowmeter are respectively connected through the pipeline behind, and the flow parameters of the cleaning water are adjusted through the connected control valve, pressure gauge and flowmeter, and then controlled through two channels The valve is connected to at least two nozzles placed in front of the second-stage impeller and the third-stage impeller; the method is: the cleaning water pump absorbs water from the stainless steel water tank and compresses it, and adjusts the flow parameters of the cleaning water through control valves, pressure gauges, and flow meters , and is assigned to the front of the second-stage impeller and the front of the third-stage impeller, and the valves are used to control the time and sequence of cleaning; it has reasonable and effective configuration, standardized operation, and can effectively ensure the long-term reliability and energy saving of the equipment. At the same time, the maintenance workload after parking is reduced.

Description

An online impeller cleaning system and method for a centrifugal air compressor in an air separation unit

technical field

The invention relates to an online impeller cleaning system and method of a centrifugal air compressor in an air separation device, belonging to the technical field of air separation.

Background technique

At present, for the impeller cleaning system, many centrifugal compressors are not equipped at all, although some are equipped, but the configuration is unreasonable and the operation is not standardized, resulting in no actual effect. In some factories, there are often accidents where the vibration of the air compressor continues to increase, and even cause accidents where the root cause is unknown; Due to insufficient attention after the shutdown, the impeller was restarted without cleaning at all, which laid hidden dangers for future stable production.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an air separation plant with reasonable and effective configuration and standardized operation, which can effectively ensure the reliability and energy saving of the long-term operation of the equipment, and at the same time reduce the maintenance workload after parking An online impeller cleaning system and method for a central centrifugal air compressor.

The object of the present invention is accomplished through the following technical solutions, an online impeller cleaning system for a centrifugal air compressor in an air separation plant, which mainly consists of a stainless steel water tank, a cleaning water pump, a control valve, a check valve, a pressure gauge, and a flow meter , pipeline and nozzle, the cleaning water pump is connected to the stainless steel water tank through the pipeline, and the control valve, pressure gauge and flowmeter are respectively connected through the pipeline behind, and the flow parameters of the cleaning water are adjusted through the connected control valve, pressure gauge and flowmeter , and then connect at least two nozzles placed in front of the second-stage impeller and the third-stage impeller through two channels respectively through the control valve.

As a preference: there is a bypass connected to the stainless steel water tank in the pipeline behind the cleaning water pump; the nozzles installed in front of the secondary impeller and the three-stage impeller, wherein the flow rate of each nozzle in front of the secondary impeller is 66.3 liters per minute, the pressure is 6.2barg, the flow rate of each nozzle before the three-stage impeller is 55 liters per minute, and the pressure is 5.9barg.

As a preference: two nozzles are respectively arranged in front of the second-stage impeller and the third-stage impeller, and corresponding to the second-stage impeller and the third-stage impeller, a drainage system matching with the corresponding impeller cooler tube bundle is also arranged, and the drainage system includes a series The main valve, automatic steam trap, condensed water discharge from the pipe, and the bypass valve of the condenser connected in parallel; the cleaning water in the stainless steel water tank is about 2% of the air mass flow rate, and desalinated water is used.

An online impeller cleaning method utilizing the online impeller cleaning system of the centrifugal air compressor in the air separation plant as described above, the cleaning method is: the cleaning water pump absorbs water from the stainless steel water tank and compresses it, passes through the control valve, the pressure gauge, the flow meter To adjust the flow parameters of the cleaning water, it is distributed to the front of the second-stage impeller and the front of the third-stage impeller, and the time and sequence of cleaning are controlled through the valve. The cleaning sequence is to clean the second-stage impeller for about 15 minutes, and then open the Corresponding to the bypass valve of the condenser behind the secondary cooler, close the main valve. After the water discharged from the bypass valve becomes clear, the impeller of this stage has been cleaned, and then clean the impeller of the third stage. After the condenser bypass valve of the stage cooler, close the main valve, and the condensed water after cleaning will become clear. After about 15 minutes, it means that the impeller has also been cleaned.

As a preference: the online impeller cleaning system is configured in the air compressor system in the DCS system, the parameters of the control valve, the liquid level of the water tank, the temperature and the chain control of the flow are set, and then the impeller cleaning system and the Connect the impeller cleaning pipes in the air compressor system correctly, temporarily block the connection of the impeller cleaning pipes of the air compressor with a blind plate, then supply desalted water to the water tank, or replace it with filtered boiler steam condensate, start the water pump cycle, and then rinse the impeller cleaning pipes at all levels one by one. After washing, stop the pump, remove the blind plate for flange connection, and at the same time drain the water in the water tank and remove the filter in front of the pump for thorough cleaning. Clean, reinstall after cleaning, cover the inlet on the top of the water tank, fill with water, open the breathing valve on the top of the water tank, and reach the standby state of the equipment;

The online cleaning is performed once or twice a week, and the nozzles for cleaning are respectively arranged in front of the respective impellers, and are sprayed onto the surface of the impellers for cleaning along with the direction of the airflow sucked in by the air.

The invention has the characteristics of reasonable and effective configuration, standardized operation, can effectively ensure the reliability and energy saving of long-term operation of the equipment, and reduce the maintenance workload after parking, etc. at the same time.

Description of drawings

Fig. 1 is a partial schematic view of the water tank of the air compressor impeller cleaning system of the present invention.

Fig. 2 is a schematic diagram of machine parts of the air compressor impeller cleaning system of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is applied as specific embodiment introduction: shown in Fig. 1, 2, centrifugal type air compressor online impeller cleaning system in a kind of air separation unit of the present invention, it mainly is made of stainless steel water tank 1, Cleaning water pump 2, a plurality of control valves, check valves, pressure gauge 3, flow meter 4, pipeline 5 and nozzle 6 are composed. The cleaning water pump 2 is connected to the stainless steel water tank 1 through the pipeline 5, and is respectively connected through the pipeline 5 at the back Control valve 7, pressure gauge 3 and flow meter 4, adjust the flow parameters of the cleaning water through the connected control valve 7, pressure gauge 3 and flow meter 4 in front of the nozzle, and then pass through the control valve 8 in front of the nozzle respectively through two channels and then connect to place There are at least two spray nozzles 6 in front of the secondary impeller 9 and the tertiary impeller 10 respectively.

As a preferred embodiment, there is a bypass 11 connected to the stainless steel water tank 1 in the pipeline behind the cleaning water pump 2 according to the present invention; the spray nozzle 6 installed before the secondary impeller 9 and the tertiary impeller 10, wherein The flow rate of each nozzle before the second-stage impeller is 66.3 liters/min, and the pressure is 6.2 barg, and the flow rate of each nozzle before the third-stage impeller is 55 liters/min, and the pressure is 5.9 barg.

As a further preferred embodiment, two spray nozzles 6 are respectively arranged in front of the second-stage impeller 9 and the third-stage impeller 10 of the present invention, and corresponding to the second-stage impeller 9 and the third-stage impeller 10 are respectively equipped with corresponding impeller coolers. The drainage system of the tube bundle 12, the drainage system includes a main valve 13 connected in series, an automatic steam trap 14, a condensed water discharge 15 connected to the pipe, and a bypass valve 16 for the condenser connected in parallel; the cleaning in the stainless steel water tank 1 The amount of water is about 2% of the air mass flow, and desalinated water is used.

An online impeller cleaning method using the online impeller cleaning system of the centrifugal air compressor in the air separation unit, the cleaning method is: the cleaning water pump absorbs water from the stainless steel water tank and compresses it, and passes through a control valve, a pressure gauge, and a flow meter. Adjust the flow parameters of the cleaning water and distribute it to the front of the second-stage impeller and the front of the third-stage impeller. The time and order of cleaning are controlled through the valve. The order of cleaning is to clean the second-stage impeller for about 15 minutes, and the corresponding For the bypass valve of the condenser behind the secondary cooler, close the main valve. After the water discharged from the bypass valve becomes clear, the impeller of this stage has been cleaned, and then the impeller of the third stage is cleaned, and the corresponding third stage is opened before cleaning. Close the main valve of the bypass valve of the condenser after the cooler, and the condensed water after cleaning will become clear. After about 15 minutes, it means that the impeller has also been cleaned.

As a preferred embodiment, the online impeller cleaning system of the present invention is configured in the air compressor system in the DCS system, and the parameters of the control valve, the liquid level of the water tank, the temperature, and the flow chain control are set. Then connect the impeller cleaning system and the impeller cleaning pipe in the air compressor system correctly, temporarily block the connection of the impeller cleaning pipe of the air compressor with a blind plate, and then supply desalted water to the water tank, or use filtered boiler steam to condense Replace the water, start the water pump to circulate, and then rinse the impeller cleaning pipes at all levels one by one. After washing, stop the pump, remove the blind plate for flange connection, and drain the water in the water tank. Remove the filter for thorough cleaning, reinstall it after cleaning, cover the inlet above the water tank, fill with water, open the breathing valve on the top of the water tank, and reach the standby state of the equipment;

The online cleaning is performed once or twice a week, and the nozzles for cleaning are respectively arranged in front of the respective impellers, and are sprayed onto the surface of the impellers for cleaning along with the direction of the airflow sucked in by the air.

Claims (5)

1. an online impeller cleaning system for a centrifugal air compressor in an air separation plant, it is mainly composed of a stainless steel water tank, a cleaning water pump, a control valve, a check valve, a pressure gauge, a flow meter, a pipeline and a shower head, and is characterized in that: The cleaning water pump is connected to the stainless steel water tank through a pipeline, and the control valve, pressure gauge and flowmeter are respectively connected through the pipeline behind, and the flow parameters of the cleaning water are adjusted through the connected control valve, pressure gauge and flowmeter, and then passed through two channels respectively. The control valve is connected to at least two sprinklers placed in front of the second-stage impeller and the third-stage impeller. 2. The online impeller cleaning system of centrifugal air compressor in air separation plant according to claim 1, characterized in that: there is a bypass connecting to the stainless steel water tank in the pipeline behind the cleaning water pump; For the nozzles in front of the second-stage impeller and the third-stage impeller, the flow rate of each nozzle in front of the second-stage impeller is 66.3 liters/minute, the pressure is 6.2 barg, and the flow rate of each nozzle in front of the third-stage impeller is 55 liters/minute. Pressure 5.9 barg. 3. The online impeller cleaning system of centrifugal air compressor in air separation plant according to claim 1 or 2, characterized in that: two nozzles are respectively arranged in front of the second-stage impeller and the third-stage impeller, corresponding to the second-stage impeller. The impeller and the three-stage impeller are respectively equipped with a drainage system matched with the tube bundle of the corresponding impeller cooler. The drainage system includes a main valve in series, an automatic steam trap, a condensate discharge from the pipe connection, and a parallel connection of the condenser bypass Valve; the amount of cleaning water in the stainless steel water tank is about 2% of the air mass flow rate, and desalinated water is used. 4. A kind of online impeller cleaning method utilizing centrifugal air compressor online impeller cleaning system in air separation plant as claimed in claim 1 or 2 or 3, it is characterized in that described cleaning method is: clean water pump from stainless steel water tank Water absorption and compression, the flow parameters of the cleaning water are adjusted through control valves, pressure gauges, and flow meters, and are distributed to the front of the second-stage impeller and the front of the third-stage impeller. The cleaning time and sequence are controlled through the valve. The cleaning sequence is first Clean the secondary impeller for about 15 minutes. Before cleaning, open the bypass valve of the condenser corresponding to the secondary cooler and close the main valve. After the water discharged from the bypass valve becomes clear, the impeller of this stage has been cleaned. Then clean the third-stage impeller. Before cleaning, open the bypass valve of the condenser corresponding to the third-stage cooler, close the main valve, and wait for the condensed water to be cleaned. After about 15 minutes, it means that the impeller has also been cleaned. 5. according to claim 4, utilize centrifugal air compressor online impeller cleaning system in said air separation plant to carry out online impeller cleaning method, it is characterized in that: The online impeller cleaning system is configured in the air compressor system in the DCS system, and the parameters of the control valve, the liquid level of the water tank, the temperature and the chain control of the flow are set, and then the impeller cleaning system and the air compressor are connected Connect the impeller cleaning pipes in the system correctly, temporarily block the connection of the air compressor impeller cleaning pipes with a blind plate, then supply desalted water to the water tank, or replace it with filtered boiler steam condensate, start the water pump to circulate, and then Then wash the impeller cleaning pipes at all levels one by one. After washing, stop the pump, remove the blind plate for flange connection, and drain the water in the water tank. Remove the filter in front of the pump for thorough cleaning. After reinstalling, cover the inlet on the top of the water tank, fill with water, and open the breathing valve on the top of the water tank to reach the standby state of the equipment; The online cleaning is performed once or twice a week, and the nozzles for cleaning are respectively arranged in front of the respective impellers, and are sprayed onto the surface of the impellers for cleaning along with the direction of the airflow sucked in by the air.