CN109538455B - Chemical energy-saving method for flexibly utilizing pump - Google Patents
Chemical energy-saving method for flexibly utilizing pump Download PDFInfo
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- CN109538455B CN109538455B CN201710858608.1A CN201710858608A CN109538455B CN 109538455 B CN109538455 B CN 109538455B CN 201710858608 A CN201710858608 A CN 201710858608A CN 109538455 B CN109538455 B CN 109538455B
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- valve
- oil
- light diesel
- sealed
- sealed oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to a chemical energy-saving method for flexibly utilizing a pump.A light diesel oil passes through FI-01 and FV-02 to a downstream device; light diesel oil is sent to the absorption tower through cross-line control switch valves KC-01, FV-01 and PI-01; light diesel oil is transferred to the sealed oil tank through the cross-line control switch valves KC-01 and FV-05; light diesel oil is led to a sealing oil pipe network through a cross-line control switch valve KC-01 and a sealing oil cross-line flow valve FV-03; the light diesel oil is connected with the tank area through a tank area valve FV-04. The invention conveys the light diesel oil to each user by crossing lines, thereby saving the electricity cost and the maintenance cost of the pump.
Description
Technical Field
The invention belongs to the technical field of measurement and control, and particularly relates to a chemical energy-saving method for flexibly utilizing a pump.
Background
In the production of a catalytic cracking unit, a pump is used as equipment which can not be lacked for conveying materials, and the pump has the defect of high energy consumption. And the probability of fault maintenance of the pump is increased in frequent use. If the pump can be stopped through the overline of the pump body or the additional overline, the production requirement can be met, and a lot of electricity charges and maintenance expenses can be saved for a factory. The problem of material deviation and reverse channeling exists when the materials are conveyed in an overline mode, so that the energy-saving method cannot play a role. In view of the above problems, it is necessary to develop a chemical energy-saving method using a pump flexibly.
Disclosure of Invention
The invention aims to provide a chemical energy-saving method for flexibly utilizing a pump.
A chemical energy-saving method for flexibly utilizing a pump comprises the following steps: s1: closing front and rear hand valves of the lean absorption oil pump, and putting a cross-line control switch valve KC-01 into an automatic control system; s2: the following control valves were put into the automatic control system: the device comprises a light diesel oil flow detection FI-01, a sealed oil tank liquid level valve FV-05, a sealed oil tank liquid level detection LI-01, a tank area valve FV-04, a sealed oil cross-line flow valve FV-03, an absorption tower flow valve FV-01, a pressure detection PI-01 and a downstream device valve FV-02; s3: starting a light diesel oil pump, conveying light diesel oil, and simultaneously putting an automatic control system into service; s4: light diesel oil passes through FI-01 and FV-02 to a downstream device; light diesel oil is sent to the absorption tower through cross-line control switch valves KC-01, FV-01 and PI-01; light diesel oil is transferred to the sealed oil tank through the cross-line control switch valves KC-01 and FV-05; light diesel oil is led to a sealing oil pipe network through a cross-line control switch valve KC-01 and a sealing oil cross-line flow valve FV-03; the light diesel oil is connected with the tank area through a tank area valve FV-04.
Further, the automatic control system of S1 specifically includes: s10: when the FI-01 detects that the flow of the light diesel reaches a preset value, the over-line control switch valve KC-01 is automatically opened; s11: the liquid level valve FV-05 of the sealed oil tank and the liquid level detection LI-01 of the sealed oil tank are controlled in cascade, and the liquid level of the sealed oil tank is controlled to be 70 percent; s12: opening conditions of a tank area valve FV-04: FI-01 detects no flow; any valve of FV-01, FV-02, FV-03 and FV-05 is closed; s13: the method comprises the steps that (1) the liquid level of a sealed oil tank is detected to be 70% by LI-01, FV-05 is closed, a sealed oil cross-line flow valve FV-03 is opened, and the sealed oil cross-line flow valve is connected to a sealed oil pipe network; s14: cascade control is formed between the flow valve FV-01 of the absorption tower and the pressure detection PI-01; s15: FV-02 is fixed at 50% valve opening.
Further, in step S14, the flow valve FV-01 and the pressure detection PI-01 of the absorption tower are specifically: the light diesel oil feeding pipeline is connected with the lower feeding hole of the absorption tower, a flow valve FV-01 of the absorption tower is arranged on the light diesel oil feeding pipeline, and a pressure detection PI-01 is arranged at the upper part of the absorption tower.
Further, step S11: the liquid level of the sealing oil tank is controlled to be closed after 70% through a sealing oil tank liquid level valve FV-05, sealing oil is conveyed to a sealing oil pipe network through a sealing oil cross-line flow valve FV-03, when the pressure of the sealing oil pipe network is lower than 2MPA, a sealing oil pump is started to convey sealing oil, meanwhile, the sealing oil tank liquid level valve FV-05 is opened, the liquid level of the sealing oil tank is controlled to be stable at 70%, and meanwhile, the sealing oil cross-line flow valve FV-03 is opened to adjust the pressure of the sealing oil pipe network to be not more than 3 MPA.
Has the advantages that:
1. according to the invention, the lean absorption oil pump and the sealing oil pump can be flexibly stopped according to the normal production requirement by the light diesel oil pump through the overline of the lean absorption oil pump and the sealing oil pump, and the requirements of each user are met by the light diesel oil pump.
2. The invention ensures that the flow of each user does not generate reverse fleeing through the automatic control system, and realizes flow balance.
Drawings
FIG. 1 is a process flow diagram of a chemical energy-saving method for flexibly utilizing a pump according to the invention,
FIG. 2 is a control circuit diagram of a sealed oil tank of the chemical energy-saving method for flexibly utilizing a pump,
FIG. 3 is a control loop diagram of the pressure series flow to the absorption tower of the chemical energy-saving method of the invention flexibly using the pump.
Detailed Description
The following describes a chemical energy-saving method for flexibly utilizing a pump according to an embodiment of the invention with reference to the attached drawings.
FIG. 1 is a process flow diagram of a chemical energy-saving method for flexibly utilizing a pump, and as shown in FIG. 1, the method for judging the false liquid level of a coal-water slurry storage tank according to the embodiment of the present invention comprises the following steps:
s1: the lean absorption oil pump is isolated for standby, front and rear hand valves of the lean absorption oil pump are closed, the cross-line control switch valve KC-01 is put into an automatic control system, light diesel oil is conveyed through the cross-line connected with the lean absorption oil inlet and the lean absorption oil outlet, and the lean absorption oil pump can be provided to each user without starting.
S2: the following control valves were put into the automatic control system: the device comprises a light diesel oil flow detection FI-01, a sealed oil tank liquid level valve FV-05, a sealed oil tank liquid level detection LI-01, a tank area valve FV-04, a sealed oil cross-line flow valve FV-03, an absorption tower flow valve FV-01, a pressure detection PI-01 and a downstream device valve FV-02.
S3: starting a light diesel oil pump, conveying light diesel oil, and simultaneously putting an automatic control system into service; s4: light diesel oil passes through FI-01 and FV-02 to a downstream device; light diesel oil is sent to the absorption tower through cross-line control switch valves KC-01, FV-01 and PI-01; light diesel oil is transferred to the sealed oil tank through the cross-line control switch valves KC-01 and FV-05; light diesel oil is led to a sealing oil pipe network through a cross-line control switch valve KC-01 and a sealing oil cross-line flow valve FV-03; the light diesel oil is connected with the tank area through a tank area valve FV-04.
The automatic liquid level control system for the coal water slurry storage tank mentioned in the step S1 specifically comprises the following steps: s10: when the FI-01 detects that the flow of the light diesel reaches a preset value, the over-line control switch valve KC-01 is automatically opened; s11: the liquid level valve FV-05 of the sealed oil tank and the liquid level detection LI-01 of the sealed oil tank are controlled in cascade, and the liquid level of the sealed oil tank is controlled to be 70 percent; s12: opening conditions of a tank area valve FV-04: FI-01 detects no flow; any valve of FV-01, FV-02, FV-03 and FV-05 is closed; s13: the method comprises the steps that (1) the liquid level of a sealed oil tank is detected to be 70% by LI-01, FV-05 is closed, a sealed oil cross-line flow valve FV-03 is opened, and the sealed oil cross-line flow valve is connected to a sealed oil pipe network; s14: cascade control is formed between the flow valve FV-01 of the absorption tower and the pressure detection PI-01; s15: FV-02 is fixed at 50% valve opening.
Wherein the flow valve FV-01 to the absorption tower and the pressure detection PI-01 mentioned in the step S14 are specifically: the light diesel oil feeding pipeline is connected with the lower feeding hole of the absorption tower, a flow valve FV-01 of the absorption tower is arranged on the light diesel oil feeding pipeline, and a pressure detection PI-01 is arranged at the upper part of the absorption tower.
The liquid level of the sealed oil tank mentioned in the step S11 is controlled to be closed after 70% through a sealed oil tank liquid level valve FV-05, sealed oil is conveyed to a sealed oil pipe network through a sealed oil cross-line flow valve FV-03, when the pressure of the sealed oil pipe network is lower than 2MPA, a sealed oil pump is started to convey the sealed oil, meanwhile, the sealed oil tank liquid level valve FV-05 is opened, the liquid level of the sealed oil tank is controlled to be stable at 70%, and meanwhile, the sealed oil cross-line flow valve FV-03 is opened to adjust the pressure of the sealed oil pipe network to be not more than 3 MP.
According to the embodiment of the control loop diagram of the sealed oil tank of the chemical energy-saving method for flexibly utilizing the pump in the figure 2: the liquid level of the sealed oil tank is controlled by controlling the flow of the supplemented sealed oil through cascade control of a liquid level controller, the output of the liquid level controller LIC-01 adjusts FIC-05, the output value of LIC-01 and the SV value of FIC-05 are calculated according to the following formula: FIC-05.SV = LIC-01.MV × K
K: FIC05 Range
When FIC-05 is switched from tandem control to non-tandem control, the MV of LIC-01 tracks the SV of FIC-05.
According to the embodiment of the control loop diagram of the pressure series flow to the absorption tower of the chemical energy-saving method flexibly utilizing the pump, the inlet flow to the absorption tower is controlled by controlling the upper pressure of the absorption tower through the flow controller cascade stage, the output of the flow controller FIC-01 adjusts PIC-01, the output value of FIC-01 and the SV value of PIC-01 are calculated according to the following formula:
FIC-01.SV=PIC-01.MV×K
k: FIC01 Range
When FIC-01 is switched from the cascade control to the non-cascade control, the MV of the PIC-01 tracks the SV of the FIC-01.
Claims (3)
1. A chemical energy-saving method for flexibly utilizing a pump is characterized by comprising the following steps: s1: closing front and rear hand valves of a lean absorption oil pump, wherein the lean absorption oil pump is positioned on a light diesel oil pipeline, light diesel oil is divided into two parallel flow paths after passing through the light diesel oil pump and a flow detector FI-01, one of the parallel flow paths flows to a downstream device valve FV-02 and flows to a downstream device, the upstream of the other flow path is connected with a span line control switch valve KC-01 and the lean absorption oil pump in parallel, the downstream of the lean absorption oil pump is provided with a parallel flow path flowing to an absorption tower, a sealed oil tank, a sealed oil pipe network and a tank area, the lean absorption oil pump is connected with two ends of the span line control switch valve KC-01 in parallel through the front and rear hand valves, and the span line control switch valve KC-01 is put; s2: putting the components into an automatic control system: the device comprises a light diesel oil flow detector FI-01, a sealed oil tank liquid level valve FV-05, a sealed oil tank liquid level detector LI-01, a tank area valve FV-04, a sealed oil cross-line flow valve FV-03, an absorption tower flow valve FV-01, a pressure detector PI-01 and a downstream device valve FV-02; s3: starting a light diesel oil pump, conveying light diesel oil, and simultaneously putting an automatic control system into service; s4: light diesel oil passes through FI-01 and FV-02 to a downstream device; light diesel oil is sent to the absorption tower through cross-line control switch valves KC-01, FV-01 and PI-01; light diesel oil is pumped to a sealed oil pipe network through a cross-line control switch valve KC-01, an FV-05, a sealed oil tank and a sealed oil pump; light diesel oil is led to a sealing oil pipe network through a cross-line control switch valve KC-01 and a sealing oil cross-line flow valve FV-03; the light diesel oil is connected with the tank area through a tank area valve FV-04;
the S1 automatic control system comprises the following specific steps: s10: when the FI-01 detects that the flow of the light diesel reaches a preset value, the over-line control switch valve KC-01 is automatically opened; s11: the liquid level valve FV-05 of the sealed oil tank and the liquid level detector LI-01 of the sealed oil tank are controlled in a cascade mode, and the liquid level of the sealed oil tank is controlled to be 70%; s12: opening conditions of a tank area valve FV-04: FI-01 detects no flow; any valve of FV-01, FV-02, FV-03 and FV-05 is closed; s13: the sealed oil tank liquid level detector LI-01 detects that the liquid level of the sealed oil tank reaches 70%, closes FV-05, opens a sealed oil cross-line flow valve FV-03, and crosses the line to the sealed oil pipe network through the sealed oil; s14: the flow valve FV-01 of the absorption tower and the pressure detector PI-01 form cascade control; s15: FV-02 is fixed at 50% valve opening.
2. The chemical energy-saving method for flexibly utilizing the mechanical pump as claimed in claim 1, wherein the step S14 is that the flow valve FV-01 and the pressure detector PI-01 of the absorption tower are specifically as follows: the light diesel oil feeding pipeline is connected with the lower feeding hole of the absorption tower, a flow valve FV-01 of the absorption tower is arranged on the light diesel oil feeding pipeline, and a pressure detector PI-01 is arranged at the upper part of the absorption tower.
3. The energy-saving chemical process for flexibly utilizing mechanical pumps as claimed in claim 1, wherein the step S11: the liquid level of the sealed oil tank is controlled to be closed after 70% through a sealed oil tank liquid level valve FV-05, sealed oil is conveyed to a sealed oil pipe network through a sealed oil cross-line flow valve FV-03, when the pressure of the sealed oil pipe network is lower than 2MPa, a sealed oil pump is started to convey the sealed oil, meanwhile, the sealed oil tank liquid level valve FV-05 is opened, the liquid level of the sealed oil tank is controlled to be stabilized at 70%, and meanwhile, the sealed oil cross-line flow valve FV-03 is opened to adjust so that the pressure of the sealed oil pipe network is not more than 3 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710858608.1A CN109538455B (en) | 2017-09-21 | 2017-09-21 | Chemical energy-saving method for flexibly utilizing pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710858608.1A CN109538455B (en) | 2017-09-21 | 2017-09-21 | Chemical energy-saving method for flexibly utilizing pump |
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| Publication Number | Publication Date |
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| CN109538455A CN109538455A (en) | 2019-03-29 |
| CN109538455B true CN109538455B (en) | 2020-11-03 |
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| CN201710858608.1A Active CN109538455B (en) | 2017-09-21 | 2017-09-21 | Chemical energy-saving method for flexibly utilizing pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109958606B (en) * | 2017-12-26 | 2021-12-21 | 中蓝连海设计研究院有限公司 | Phase angle control method suitable for condition of parallel transportation of multiple diaphragm pumps |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204022452U (en) * | 2014-06-04 | 2014-12-17 | 大庆中蓝石化有限公司 | Gas separation unit mass transport energy conserving system |
| CN203948949U (en) * | 2014-07-23 | 2014-11-19 | 山东华星石油化工集团有限公司 | Be adapted to the liquid propylene feedway of discontinuous operation |
| CN204619688U (en) * | 2015-05-13 | 2015-09-09 | 山东京博石油化工有限公司 | One is absorbent optimization device again |
| CN106675616B (en) * | 2015-11-11 | 2019-01-22 | 中国石化工程建设有限公司 | The method for reducing catalytic cracking unit Vapor recovery unit part supplement absorbent dosage |
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Effective date of registration: 20201015 Address after: Room 203, unit 2, building 10, longhui District, Congjiang street, Yiwu City, Jinhua City, Zhejiang Province Applicant after: Yiwu yanchuang Industrial Design Co., Ltd Address before: 537100 Third Floor, No. 4, Fuji New Town, Jingang Avenue, Gangbei District, Guigang City, Guangxi Zhuang Autonomous Region Applicant before: GUIGANG HOUSHUN INFORMATION TECHNOLOGY Co.,Ltd. |
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