CN-121855318-A - Plate heat exchanger cleaning system, plate heat exchanger cleaning method and device

CN121855318ACN 121855318 ACN121855318 ACN 121855318ACN-121855318-A

Abstract

The application discloses a plate heat exchanger cleaning system, a plate heat exchanger cleaning method and a plate heat exchanger cleaning device, wherein the plate heat exchanger cleaning system is provided with a parallel cleaning loop, a dry gas injection branch and a valve group, and the valves and the cleaning medium supply unit are controlled by the control unit, so that the channel to be cleaned in the plate heat exchanger can be isolated from the main process pipeline without disassembling equipment, and is cleaned and dried, thereby realizing online cleaning. This plate heat exchanger cleaning system can wash plate heat exchanger passageway under air separation plant running state, need not to shut down the dismounting device and can accomplish the maintenance operation, has both reduced the economic loss that production interruption brought, has reduced the mechanical damage that frequent dismouting caused the heat exchanger structure again, has improved the security and the stability of cleaning process and follow-up operation simultaneously.

Inventors

XU SHICHANG
WANG XIANGJUN
ZHOU XIAOLONG
YUE FANG

Assignees

新疆准能化工有限公司
新疆准能化工有限公司

Dates

Publication Date: 20260414
Application Date: 20260305
Priority Date: 20260305

Claims (10)

1. A plate heat exchanger cleaning system, characterized in that the plate heat exchanger cleaning system comprises: The plate heat exchanger is arranged on a main process pipeline of the air separation device and is provided with at least one process fluid channel; A cleaning medium supply unit for storing and supplying a cleaning medium; The cleaning loop comprises a cleaning injection branch and a cleaning return liquid branch, the cleaning injection branch is respectively communicated with a first end of a channel to be cleaned and the cleaning medium supply unit, the cleaning return liquid branch is respectively communicated with a second end of the channel to be cleaned and the cleaning medium supply unit, and the channel to be cleaned is one of at least one process fluid channel of the plate heat exchanger; the drying gas injection branch is communicated with the first end of the channel to be cleaned and is used for injecting high-temperature drying gas into the channel to be cleaned; the valve group comprises valves arranged at two ends of the channel to be cleaned and used for isolating gas in the main process pipeline, valves arranged in the dry gas injection branch and valves arranged in the parallel cleaning loops; And the control unit is in signal connection with the valve group and the cleaning medium supply unit and is used for controlling each valve in the valve group and the cleaning medium supply unit.
2. The plate heat exchanger cleaning system of claim 1 wherein the valve train comprises a first valve disposed at a first end of the channel to be cleaned, a second valve disposed at a second end of the channel to be cleaned, a third valve disposed at the cleaning injection branch, a fourth valve disposed at the cleaning injection branch, and a fifth valve disposed at the drying gas injection branch.
3. A plate heat exchanger washing system according to claim 1, wherein the washing medium supply unit comprises a pump for pumping the washing medium in the washing medium container into the washing injection branch, and a washing liquid return branch for injecting the washing medium after washing into the washing medium container.
4. A plate heat exchanger cleaning system according to claim 3, wherein the condensation point of the cleaning medium is lower than the operating temperature of the channels to be cleaned.
5. The plate heat exchanger cleaning system according to claim 1, further comprising a temperature sensor for acquiring the temperature in the channels to be cleaned, a flow meter for acquiring the flow rate of cleaning medium injected into the channels to be cleaned, and a pressure sensor for acquiring the gas pressure in each of the process fluid channels.
6. A method of cleaning a plate heat exchanger, characterized by being applied to a control unit of a plate heat exchanger cleaning system according to claim 1, the method comprising: closing valves arranged at two ends of the channel to be cleaned and used for isolating gas in the main process pipeline, wherein the channel to be cleaned is one of at least one process fluid channel of the plate heat exchanger; Opening a valve arranged on the dry gas injection branch so that the dry gas sweeps the channel to be cleaned; after the valve arranged on the dry gas injection branch is closed, the valve arranged on the parallel cleaning loop is opened, and a cleaning signal for indicating the injection of the cleaning medium into the channel to be cleaned is sent to the cleaning medium supply unit.
7. The method according to claim 6, wherein if the plate heat exchanger cleaning system comprises a temperature sensor for acquiring the temperature in the channel to be cleaned, the closing of the valve provided in the drying gas injection branch comprises: Acquiring the channel temperature in the channel to be cleaned acquired by the temperature sensor; After closing the valve arranged on the dry gas injection branch, if the channel temperature is greater than or equal to a first temperature threshold, closing the valve arranged on the dry gas injection branch, wherein the first temperature threshold is a temperature determined based on a material allowable temperature rise range of the plate heat exchanger and a condensation point of the cleaning medium.
8. The method of claim 6, wherein if the plate heat exchanger cleaning system includes a pressure sensor for sensing the gas pressure within each of the process fluid passages, the method further comprises: Acquiring channel air pressures corresponding to the process fluid channels acquired by the pressure sensors; If the channel air pressure of the target process fluid channel exceeds the target stable air pressure interval, generating a corresponding air quantity adjusting instruction according to the channel air pressure corresponding to each process fluid channel, wherein the air quantity adjusting instruction is used for reducing the air flow injected into the main process pipeline, and the target process fluid channel is any one of the process fluid channels; And sending the air quantity adjusting instruction to a front-end compression system so that the channel air pressure corresponding to each process fluid channel is in a corresponding stable air pressure interval, wherein the front-end compression system is used for injecting compressed air into the main process pipeline.
9. A plate heat exchanger cleaning device, characterized by a control unit applied to a plate heat exchanger cleaning system according to claim 1, said device comprising: the closing unit is used for closing valves arranged at two ends of the channel to be cleaned and used for isolating gas in the main process pipeline, and the channel to be cleaned is one of at least one process fluid channel of the plate heat exchanger; The opening unit is used for opening a valve arranged on the dry gas injection branch so as to enable the dry gas to purge the channel to be cleaned; The opening unit is further used for opening the valve arranged in the parallel cleaning loop after closing the valve arranged in the dry gas injection branch, and sending a cleaning signal for indicating the cleaning medium to be injected into the channel to be cleaned to the cleaning medium supply unit.
10. A computer device, the computer device comprising a processor and a memory; The memory is used for storing a computer program and transmitting the computer program to the processor; The processor is configured to perform the method of any of claims 6-8 according to the computer program.

Description

Plate heat exchanger cleaning system, plate heat exchanger cleaning method and device Technical Field The invention relates to the technical field of plate heat exchangers, in particular to a plate heat exchanger cleaning system, a plate heat exchanger cleaning method and a plate heat exchanger cleaning device. Background In the air separation device, a plate heat exchanger (such as a main heat exchanger, a condensing evaporator and the like) of the rectifying tower system is a core component for realizing heat exchange among media such as air, nitrogen, oxygen and the like. During long-term operation, moisture, carbon dioxide, trace amounts of hydrocarbons such as acetylene, and lubricating oil vapors in the air gradually accumulate, freeze or adhere within the heat exchanger channels, forming fouling. The dirt can greatly reduce heat exchange efficiency, increase system resistance (pressure drop), cause energy consumption to rise, even block a flow passage when serious, cause safety accidents such as local overheating and overpressure, and the like, and influence the stable operation of the whole air separation device. In the related art, an off-line mode is generally adopted for cleaning the plate heat exchanger. The whole air separation device is required to be shut down, decompressed and heated (thawed), then the heat exchanger is lifted out of the cold box, transported to a professional workshop for disassembly, cleaned after disassembly, reassembled, leak detected and dried after cleaning is finished, and then lifted back to the cold box for re-assembly. However, the off-line cleaning process takes up to several weeks, resulting in long production breaks, resulting in significant economic losses, and frequent disassembly and assembly is prone to mechanical damage to the delicate plate heat exchanger units. Disclosure of Invention The application provides a plate heat exchanger cleaning system, a plate heat exchanger cleaning method and a plate heat exchanger cleaning device, which are used for reducing the production interruption time and improving the equipment utilization rate and the production efficiency. Based on the above, the application discloses the following technical scheme: In a first aspect, an embodiment of the present application provides a plate heat exchanger cleaning system, including: The plate heat exchanger is arranged on a main process pipeline of the air separation device and is provided with at least one process fluid channel; A cleaning medium supply unit for storing and supplying a cleaning medium; The cleaning loop comprises a cleaning injection branch and a cleaning return liquid branch, the cleaning injection branch is respectively communicated with a first end of a channel to be cleaned and a cleaning medium supply unit, the cleaning return liquid branch is respectively communicated with a second end of the channel to be cleaned and the cleaning medium supply unit, and the channel to be cleaned is one of at least one process fluid channel of the plate heat exchanger; The drying gas injection branch is communicated with the first end of the channel to be cleaned and is used for injecting high-temperature drying gas into the channel to be cleaned; the valve group comprises valves arranged at two ends of the channel to be cleaned and used for isolating gas in the main process pipeline, valves arranged on the dry gas injection branch and valves arranged on the parallel cleaning loops; and the control unit is in signal connection with the valve group and the cleaning medium supply unit and is used for controlling each valve in the valve group and the cleaning medium supply unit. In a second aspect, an embodiment of the present application provides a method for cleaning a plate heat exchanger, where the method includes: Closing valves arranged at two ends of a channel to be cleaned, which is one of at least one process fluid channel of the plate heat exchanger, for isolating gas in the main process pipeline; opening a valve arranged on the dry gas injection branch so as to enable the dry gas to purge the channel to be cleaned; After the valve arranged on the dry gas injection branch is closed, the valve arranged on the parallel cleaning loop is opened, and a cleaning signal for indicating the injection of the cleaning medium into the channel to be cleaned is sent to the cleaning medium supply unit. In a third aspect, an embodiment of the present application provides a plate heat exchanger cleaning device, including: the closing unit is used for closing valves arranged at two ends of a channel to be cleaned and used for isolating gas in the main process pipeline, and the channel to be cleaned is one of at least one process fluid channel of the plate heat exchanger; the opening unit is used for opening a valve arranged on the dry gas injection branch so as to enable the dry gas to purge the channel to be cleaned; And the opening unit is also used for opening the valve arranged i