CN109253558B - Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water - Google Patents
Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water Download PDFInfo
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- CN109253558B CN109253558B CN201810226143.2A CN201810226143A CN109253558B CN 109253558 B CN109253558 B CN 109253558B CN 201810226143 A CN201810226143 A CN 201810226143A CN 109253558 B CN109253558 B CN 109253558B
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- Prior art keywords
- valve
- refrigerating unit
- ammonia water
- pressure difference
- waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
Abstract
The invention discloses an automatic backwashing device and method for a refrigerating unit by utilizing waste heat of circulating ammonia water, and relates to the technical field of automatic backwashing of the refrigerating unit. The invention is realized by a valve V1, a valve V2, a valve V3, a valve V4, a valve V5, a differential pressure gauge, a waste discharge pool and a pipeline, wherein the valve V1 is used for controlling ammonia water to flow into a refrigerating unit; the valve V2 realizes the bypass flow of ammonia water, the valve V3 realizes the normal outflow of ammonia water from the refrigerating unit, the valve V4 realizes the reverse inflow of bypass ammonia water into the refrigerating unit, and the valve V5 realizes the inflow of ammonia water containing a large amount of tar into a waste discharge tank after the reverse flushing; the pressure difference meter 1 realizes the monitoring of the pressure difference of the inlet and the outlet of the refrigerating unit, and the waste discharge tank is used for accommodating waste ammonia water generated after reverse flushing. The advantages are that: the refrigeration unit can automatically realize the cleaning of the inside of the refrigeration unit after the refrigeration efficiency is reduced because too much compounds such as tar and the like separated out after the ammonia water is further cooled are accumulated, and the efficiency of utilizing the waste heat of the circulating ammonia water to the refrigeration unit is ensured.
Description
Technical Field
The invention relates to the technical field of automatic backwashing of refrigerating units, in particular to an automatic backwashing device and method of a refrigerating unit by utilizing waste heat of circulating ammonia water.
Background
The coal coking is a process for heating coking coal to 950-1050 ℃ under the condition of air isolation, and producing coke, coke oven gas and coking chemical products through high-temperature dry distillation. The coke oven gas is escaped from the carbonizing chamber through the ascending pipe at 700 deg.c, and the gas contains tar gas, benzene hydrocarbon, water vapor, ammonia, hydrogen sulfide, hydrogen cyanide, naphthalene and other compounds, and the bridge pipe and the gas collecting pipe are sprayed with great amount of circular ammonia water for recovering and treating these compounds, so that when the fine mist ammonia water is contacted with the raw gas, the gas is cooled to 83 +/-5 deg.c and the ammonia water absorbs great amount of heat to 80 +/-5 deg.c. The cooled tar carried by the circulating ammonia water is separated from the coal gas through a gas collecting pipe and a gas-liquid separator, the separated liquid flows into a mechanical clarifying tank to be separated from the tar, the ammonia water separated from the tar enters a circulating ammonia water tank, and then is pumped into a bridge pipe through a circulating ammonia water pump for recycling. The heat of the raw gas carried by the circulating ammonia water in the system is wasted in the atmosphere, so that the energy is wasted. The research on the refrigerating unit utilizing the waste heat of the circulating ammonia water is emphasized since the last 90 th century in domestic scientific research institutions, and the research on the aspects of colleges and universities such as the institute of thermophysics of the Chinese academy, the university of the China, and the like is relatively deep, and prototypes are respectively tested. The circulating ammonia water passes through the lithium bromide refrigerating unit, the superheat degree of the sprayed circulating ammonia water is reduced, free high-temperature circulating ammonia water is directly introduced into the lithium bromide refrigerating unit to produce cold water as a heat source, the sensible heat of coke oven crude gas can be recovered, the purposes of energy conservation and emission reduction are achieved, and the energy consumption of the corresponding heat source can be reduced according to the heat sources of different refrigerating equipment of customers, so that the method has a wide application prospect.
However, the high-temperature circulating ammonia water is cooled in the cooling process, and at this time, compounds such as tar and the like are still separated out and accumulated on a pipeline of the circulating ammonia water waste heat utilization refrigerating unit, and the flow of the ammonia water is gradually obstructed along with the accumulation of the precipitates, so that the refrigerating efficiency of the refrigerating unit is reduced, the refrigerating capacity cannot meet the actual requirement, and therefore the refrigerating unit needs to be subjected to decontamination treatment according to the condition of pipeline blockage.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an automatic backwashing device and method for a circulating ammonia water waste heat utilization refrigerating unit, which can automatically realize cleaning of the refrigerating unit after excessive pollutants are accumulated in a pipeline, ensure the efficiency of the circulating ammonia water waste heat utilization refrigerating unit and ensure the refrigerating capacity of the refrigerating unit.
The invention is realized by the following technical scheme: an automatic back-flushing device of a refrigerating unit utilizing waste heat of circulating ammonia water comprises a valve V1, a valve V2, a valve V3, a valve V4, a valve V5 and a differential pressure gauge; the water outlet of the main ammonia water path is connected with the inlet of the refrigerating unit through a valve V1 by a pipeline, the outlet of the refrigerating unit is connected with three pipelines, one pipeline is connected with a valve V1 by a valve V3 to realize the circulation of the ammonia water of the refrigerating unit, the other pipeline is connected with the inlet of the refrigerating unit by a pressure difference meter, and the three pipelines are connected with the water outlet of the bypass ammonia water path through a valve V4 and a valve V2 in sequence; the water inlet of the refrigerating unit is connected with the waste discharging pool through a pipeline by a valve V5.
Preferably, the pressure difference meter further comprises a controller, the valve V1, the valve V2, the valve V3, the valve V4 and the valve V5 are all electrically operated valves, the pressure difference meter inputs the acquired information into the controller, and the controller controls the opening or closing of each valve according to the processed acquired information.
An automatic back flushing method for a refrigerating unit utilizing waste heat of circulating ammonia water comprises the following steps of adopting any one device: when the system is normal, the valve V1 and the valve V3 are opened, the valve V2, the valve V4 and the valve V5 are closed, and at the moment, ammonia water flows in from the inlet of the refrigerating unit and flows out from the outlet of the refrigerating unit;
when the pressure difference meter monitors that the pressure difference between the inlet and the outlet of the refrigerating unit is greater than a set value, the valve V1 and the valve V3 are closed, the valve V2, the valve V4 and the valve V5 are opened, ammonia water flows reversely, dirt accumulated in the refrigerating unit is washed, and waste liquid generated by reverse washing is discharged into a waste discharge pool;
when the valve is cleaned, the valve V1 and the valve V3 are opened again, and the valve V2, the valve V4 and the valve V5 are closed.
Preferably, the set value is 0.1 mpa.
The invention has the beneficial effects that: the refrigerating unit pipeline can automatically realize cleaning after storing excessive pollutants, the efficiency of the circulating ammonia water waste heat utilization refrigerating unit is ensured, and the industrialization requirement of utilizing the circulating ammonia water waste heat for refrigeration is ensured.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, an automatic back-flushing device of a circulating ammonia water waste heat utilization refrigerating unit comprises a valve V1, a valve V2, a valve V3, a valve V4, a valve V5 and a pressure difference meter; the water outlet of the main ammonia water path is connected with the inlet of the refrigerating unit through a valve V1 by a pipeline, the outlet of the refrigerating unit is connected with three pipelines, one pipeline is connected with a valve V1 by a valve V3 to realize the circulation of the ammonia water of the refrigerating unit, the other pipeline is connected with the inlet of the refrigerating unit by a pressure difference meter, and the three pipelines are connected with the water outlet of the bypass ammonia water path through a valve V4 and a valve V2 in sequence; the water inlet of the refrigerating unit is connected with the waste discharging pool through a pipeline by a valve V5. The valve V1 is used for controlling the ammonia water to flow into the refrigerating unit and blocking the inflow of the ammonia water during the back flushing; the valve V2 realizes the bypass flow of ammonia water; the valve V3 realizes that the ammonia water normally flows out of the refrigerating unit, and the valve is closed during reverse flushing to ensure that the ammonia water can realize reverse flow; the valve V4 realizes that the bypass ammonia water reversely flows into the refrigerating unit to flush and clean the interior of the unit; the valve V5 is closed when normal, and is opened when back flushing, so that unqualified ammonia water is ensured to flow into a waste discharging pool; the pressure difference meter realizes the monitoring of the pressure difference of the inlet and the outlet of the refrigerating unit; the waste discharge tank is used for accommodating waste ammonia water generated after reverse flushing.
An automatic back flushing method for a refrigerating unit by utilizing waste heat of circulating ammonia water comprises the steps of opening a valve V1 and a valve V3, closing a valve V2, a valve V4 and a valve V5 when normal, enabling the ammonia water to flow in from an inlet of the refrigerating unit and flow out from an outlet of the refrigerating unit at the moment, ensuring normal operation of the refrigerating unit, closing the valve V1 and the valve V3 when a pressure difference meter monitors that the pressure difference between the inlet and the outlet of the refrigerating unit is greater than 0.1 MPa, opening the valve V2, the valve V4 and the valve V5 to realize reverse flowing of the ammonia water, flushing dirty matters stored in the refrigerating unit, discharging waste liquid generated by reverse flushing into a waste discharge pool, and reopening the valve V1 and the valve V3, closing the valve V2, the valve V4 and the valve V5 after the refrigerating unit is cleaned.
In order to realize automatic control of each valve, the valve V1, the valve V2, the valve V3, the valve V4 and the valve V5 all adopt electric T valves, the pressure difference meter inputs acquired information into a controller, and the controller controls the opening or closing of each valve after processing the acquired information.
Claims (3)
1. The utility model provides an automatic back flush device of circulation aqueous ammonia waste heat utilization refrigerating unit which characterized in that: comprises a valve V1, a valve V2, a valve V3, a valve V4, a valve V5 and a pressure difference meter; the water outlet of the main ammonia water path is connected with the inlet of the refrigerating unit through a valve V1 by a pipeline, the outlet of the refrigerating unit is connected with three pipelines, one pipeline is connected with a valve V1 by a valve V3 to realize the circulation of the ammonia water of the refrigerating unit, the other pipeline is connected with the inlet of the refrigerating unit by a pressure difference meter, and the three pipelines are connected with the water outlet of the bypass ammonia water path through a valve V4 and a valve V2 in sequence; the water inlet of the refrigerating unit is connected with a waste discharge tank through a valve V5 by a pipeline;
the pressure difference meter is characterized by further comprising a controller, the valve V1, the valve V2, the valve V3, the valve V4 and the valve V5 are all electric valves, collected information is input into the controller through the pressure difference meter, and the controller controls the opening or closing of the valves according to the collected information after the collected information is processed.
2. An automatic back flushing method of a refrigerating unit utilizing waste heat of circulating ammonia water is characterized in that: the device of claim 1 is adopted, and comprises the following specific steps: when the system is normal, the valve V1 and the valve V3 are opened, the valve V2, the valve V4 and the valve V5 are closed, and at the moment, ammonia water flows in from the inlet of the refrigerating unit and flows out from the outlet of the refrigerating unit;
when the pressure difference meter monitors that the pressure difference between the inlet and the outlet of the refrigerating unit is greater than a set value, the valve V1 and the valve V3 are closed, the valve V2, the valve V4 and the valve V5 are opened, ammonia water flows reversely, dirt accumulated in the refrigerating unit is washed, and waste liquid generated by reverse washing is discharged into a waste discharge pool;
when the valve is cleaned, the valve V1 and the valve V3 are opened again, and the valve V2, the valve V4 and the valve V5 are closed.
3. The automatic back flushing method of the circulating ammonia water waste heat utilization refrigerating unit as claimed in claim 2, wherein the method comprises the following steps: the set value was 0.1 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810226143.2A CN109253558B (en) | 2018-03-19 | 2018-03-19 | Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water |
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| CN201810226143.2A CN109253558B (en) | 2018-03-19 | 2018-03-19 | Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water |
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| CN109253558B true CN109253558B (en) | 2021-02-26 |
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| CN111992548B (en) * | 2020-08-21 | 2022-07-26 | 常州大学 | Device and method for automatically cleaning water circulation pipeline polymer |
| WO2022249424A1 (en) * | 2021-05-28 | 2022-12-01 | 三菱電機株式会社 | Refrigeration cycle system |
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| US5162084A (en) * | 1991-10-08 | 1992-11-10 | Conoco Inc. | Process for monitoring and controlling an alkanolamine reaction process |
| US20120211418A1 (en) * | 2011-02-18 | 2012-08-23 | Taiwan Semiconductor Manufacturing Company, Ltd. | Slurry Concentration System and Method |
| CN102772940A (en) * | 2012-07-31 | 2012-11-14 | 黑龙江建龙钢铁有限公司 | Device and method for back washing of ceramic filter of coking surplus ammonia water filter tar |
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- 2018-03-19 CN CN201810226143.2A patent/CN109253558B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363677A (en) * | 2008-09-28 | 2009-02-11 | 湖南大学 | Oil return control method of direct expansion type earth source heat pump |
| CN102827623A (en) * | 2012-09-07 | 2012-12-19 | 云南大为制焦有限公司 | Method and system for recycling waste heat of ammonia water |
| CN103305239A (en) * | 2013-06-20 | 2013-09-18 | 内蒙古包钢钢联股份有限公司 | Method for online cleaning coke oven gas pipeline |
| CN204298354U (en) * | 2014-11-28 | 2015-04-29 | 中国平煤神马集团平顶山朝川焦化有限公司 | A kind of tar purging system of gas piping |
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