CN111076861A - Anti-blocking five-group valve and control method thereof - Google Patents
Anti-blocking five-group valve and control method thereof Download PDFInfo
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- CN111076861A CN111076861A CN202010012330.8A CN202010012330A CN111076861A CN 111076861 A CN111076861 A CN 111076861A CN 202010012330 A CN202010012330 A CN 202010012330A CN 111076861 A CN111076861 A CN 111076861A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0627—Protection against aggressive medium in general
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Abstract
The invention discloses an anti-blocking five-group valve and a control method thereof, which can effectively remove liquid drops and dust in a pressure guiding pipe and a valve group and can ensure the stable operation of a differential pressure transmitter. The invention can realize full-automatic blockage removal and maintenance of the pressure transmitter, can ensure the normal operation of the instrument, and has important safety and economic significance for the normal operation of the whole unit when being used as a control parameter.
Description
Technical Field
The invention relates to a five-group valve, in particular to an anti-blocking five-group valve and a control method thereof.
Background
The resistance of present flue equipment adopts differential pressure changer to measure basically, because the characteristic that the flue gas contains water and dirt, especially after wet flue gas desulfurization, the water content more can increase, therefore the differential pressure changer all is equipped with five groups of valves on the pressure pipe generally, after condensation drop or entering dust in the pressure pipe, the measured value of its differential pressure can cause the fault such as the registration is big partially because the pressure pipe blocks up, need open five groups of valve blowoff valves this moment and carry out the blowdown.
As shown in fig. 1, the conventional five-group valve structure includes: a first cut valve V1, a second cut valve V2, a third cut valve V3, a fourth cut valve V4, and a fifth cut valve V5; one end of a first stop valve V1, one end of a third stop valve V3 and one end of a fourth stop valve V4 are connected with a high-pressure side interface of the pressure transmitter, one end of a second stop valve V2 and one end of a fifth stop valve V5 are connected with a low-pressure side interface of the pressure transmitter, the other end of the first stop valve V1 is connected with a high-pressure side pressure introduction pipe interface, the other end of a second stop valve V2 is connected with a low-pressure side pressure introduction pipe interface, the other end of the third stop valve V3 is connected with a low-pressure side interface of the pressure transmitter, the other end of the fourth stop valve V4 is connected with a high-pressure side sewage draining port, and the other end of the fifth stop valve V36.
The working principle of the existing five-group valve structure is as follows: the stop valves V1 and V2 are connected to a pressure leading pipe interface, the stop valve V3 is a balance valve, the stop valves V4 and V5 are blowoff valves, the high-pressure side stop valve V1 is opened when the pressure difference transmitter works normally, the balance valve V3 is closed, the low-pressure side stop valve V2 is opened again, when the pressure leading pipe is blocked and needs to be maintained, the blowoff valves V4 and V5 are opened, the pressure difference transmitter is discharged by means of smoke pressure and water drop gravity action (the pressure transmitter is arranged at a low position), and therefore faults can be cleared without assembling and disassembling the pressure difference transmitter.
The existing five-group valve structure has at least the following defects and shortcomings:
1) the existing five groups of valves are used for sewage disposal under the action of smoke pressure and gravity, but a flue in front of an induced draft fan is in negative pressure, and liquid drops in a pressure guiding pipe cannot be discharged smoothly when the pressure guiding pipe has more elbows and longer length;
2) the pressure pipe has water drops and also has fine dust accumulation, the opening of the blow-down valve can not ensure that the dust can be completely discharged along with the water drops, the dust can be attached to the inner wall of the pressure pipe, and the pressure pipe can be blocked if the pressure pipe is long;
3) because flue gas malleation, and steam are great, take place occasionally in the induced-draft tube jam condition at the desulfurizing tower exit, need the manual work to send out the on-the-spot switch valve frequently and blow down this moment, caused the waste of manpower resources and time.
Disclosure of Invention
The invention aims to provide an anti-blocking five-group valve which can effectively remove liquid drops and dust in a pressure leading pipe and a valve group and can ensure the stable operation of a differential pressure transmitter.
In order to achieve the above object, the present invention provides an anti-blocking type five-group valve, comprising: the first stop valve, the second stop valve, the third stop valve, the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve and the eighth stop valve;
one end of the first stop valve, the third stop valve, the fourth stop valve, the fifth stop valve and the seventh stop valve is connected with a high-pressure side interface of the pressure transmitter,
one end of the second stop valve, one end of the sixth stop valve and one end of the eighth stop valve are connected with a low-pressure side interface of the pressure transmitter,
the other end of the first stop valve is connected with a high-pressure side pressure guiding pipe interface,
the other end of the second stop valve is connected with a low-pressure side pressure guide pipe interface,
the other ends of the third stop valve and the fourth stop valve are connected with a low-pressure side interface of the pressure transmitter,
the other end of the fifth stop valve is connected with a sewage outlet at the high pressure side,
the other end of the sixth stop valve is connected with a sewage outlet at the low pressure side,
the other end of the seventh stop valve is connected with a high-pressure side compressed air interface,
the other end of the eighth stop valve is connected with a low-pressure side compressed air interface.
Preferably, the third stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve and the eighth stop valve are electrically operated valves.
The invention also provides a control method of the anti-blocking five-group valve, which comprises the following steps: when the pressure difference transmitter normally works, the first stop valve and the second stop valve are opened, the fourth stop valve and the third stop valve are closed, when the pressure guiding pipe is blocked, the pressure change number begins to rise, the fifth stop valve and the sixth stop valve are opened at the moment (the fifth stop valve and the sixth stop valve are electric blow-down valves), the seventh stop valve and the third stop valve are opened respectively after 10S delay, high-pressure side blowing is carried out, the seventh stop valve is closed after 10S delay, the eighth stop valve is opened, low-pressure side blowing is carried out, the fifth stop valve and the sixth stop valve are closed after 10S delay, pressure guiding pipe back blowing is carried out, the third stop valve and the eighth stop valve are closed after 30S delay, and the blowing process is finished at the moment.
The invention has the advantages and beneficial effects that: the anti-blocking five-group valve can effectively remove liquid drops and dust in a pressure guiding pipe and a valve group and can ensure stable operation of a differential pressure transmitter.
The invention changes necessary valves into electric valves on the basis of the original five groups of valves, and adds a pneumatic back-blowing device to ensure that water drops and dust in the pressure guiding pipe are removed as clean as possible.
The invention can adopt a full-automatic purging program and has high automation degree.
The invention can realize full-automatic blockage removal and maintenance of the pressure transmitter, can ensure the normal operation of the instrument, and has important safety and economic significance for the normal operation of the whole unit when being used as a control parameter.
Drawings
FIG. 1 is a schematic diagram of a prior art five-bank valve configuration;
fig. 2 is a schematic diagram of the structure of the anti-blocking five-group valve of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2, the present invention provides an anti-blocking type five-group valve, including: a first cut valve V1, a second cut valve V2, a third cut valve V3, a fourth cut valve V4, a fifth cut valve V5, a sixth cut valve V6, a seventh cut valve V7, and an eighth cut valve V8;
one ends of a first stop valve V1, a third stop valve V3, a fourth stop valve V4, a fifth stop valve V5 and a seventh stop valve V7 are connected with a high-pressure side interface of the pressure transmitter,
one ends of a second stop valve V2, a sixth stop valve V6 and an eighth stop valve V8 are connected with a low-pressure side interface of the pressure transmitter,
the other end of the first stop valve V1 is connected with a high-pressure side pressure guide pipe interface,
the other end of the second stop valve V2 is connected with the low-pressure side pressure-leading pipe interface,
the other ends of the third stop valve V3 and the fourth stop valve V4 are connected with a low-pressure side interface of the pressure transmitter,
the other end of the fifth stop valve V5 is connected with a high pressure side sewage draining outlet,
the other end of the sixth stop valve V6 is connected with a low-pressure side sewage draining outlet,
the other end of the seventh stop valve V7 is connected to the high-pressure side compressed air port,
the other end of the eighth cut-off valve V8 is connected with the low-pressure side compressed air interface,
the third stop valve V3, the fifth stop valve V5, the sixth stop valve V6, the seventh stop valve V7, and the eighth stop valve V8 are electric valves.
The invention also provides a control method of the anti-blocking five-group valve, which comprises the following steps: when the differential pressure transmitter normally works, the first stop valve V1 and the second stop valve V2 are opened, the fourth stop valve V4 and the third stop valve V3 are closed, when the pressure guiding pipe is blocked, the pressure variation number begins to rise, at the moment, the fifth stop valve V5 and the sixth stop valve V6 are opened (the fifth stop valve V5 and the sixth stop valve V6 are electric blow-down valves), after 10S delay, the seventh stop valve V7 and the third stop valve V3 are respectively opened, high-pressure side blowing is carried out, after 10S delay, the seventh stop valve V7 is closed, the eighth stop valve V8 is opened, low-pressure side blowing is carried out, after 10S delay, the fifth stop valve V5 and the sixth stop valve V6 are closed, back blowing is carried out on the pressure guiding pipe, after 30S delay, the third stop valve V3 and the eighth stop valve V8 are closed, and the blowing process is ended at the moment.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. Prevent five group's valves of stifled type, its characterized in that includes: the first stop valve, the second stop valve, the third stop valve, the fourth stop valve, the fifth stop valve, the sixth stop valve, the seventh stop valve and the eighth stop valve;
one end of the first stop valve, the third stop valve, the fourth stop valve, the fifth stop valve and the seventh stop valve is connected with a high-pressure side interface of the pressure transmitter,
one end of the second stop valve, one end of the sixth stop valve and one end of the eighth stop valve are connected with a low-pressure side interface of the pressure transmitter,
the other end of the first stop valve is connected with a high-pressure side pressure guiding pipe interface,
the other end of the second stop valve is connected with a low-pressure side pressure guide pipe interface,
the other ends of the third stop valve and the fourth stop valve are connected with a low-pressure side interface of the pressure transmitter,
the other end of the fifth stop valve is connected with a sewage outlet at the high pressure side,
the other end of the sixth stop valve is connected with a sewage outlet at the low pressure side,
the other end of the seventh stop valve is connected with a high-pressure side compressed air interface,
the other end of the eighth stop valve is connected with a low-pressure side compressed air interface.
2. The anti-clogging five-group valve according to claim 1, wherein the third, fifth, sixth, seventh and eighth stop valves are electrically operated valves.
3. The control method of the anti-blocking type five-group valve according to claim 1 or 2, characterized by comprising the steps of: when the pressure difference transmitter normally works, the first stop valve and the second stop valve are opened, the fourth stop valve and the third stop valve are closed, when the pressure tube is blocked, the pressure indication number begins to rise, the fifth stop valve and the sixth stop valve are opened at the moment, the seventh stop valve and the third stop valve are opened respectively after 10S of time delay, the high-pressure side purging is carried out, the seventh stop valve is closed after 10S of time delay, the eighth stop valve is opened, the low-pressure side purging is carried out, the fifth stop valve and the sixth stop valve are closed after 10S of time delay, the back purging of the pressure tube is carried out, the third stop valve and the eighth stop valve are closed after 30S of time delay, and the purging process is finished at the moment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010012330.8A CN111076861B (en) | 2020-01-07 | 2020-01-07 | Anti-blocking five-group valve and control method thereof |
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| CN202010012330.8A CN111076861B (en) | 2020-01-07 | 2020-01-07 | Anti-blocking five-group valve and control method thereof |
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| CN111076861A true CN111076861A (en) | 2020-04-28 |
| CN111076861B CN111076861B (en) | 2021-10-08 |
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| CN207096272U (en) * | 2017-06-27 | 2018-03-13 | 无锡商业职业技术学院 | A kind of anti-blocking resistant wear wind speed and wind system for measuring quantity |
| CN109108001A (en) * | 2017-06-26 | 2019-01-01 | 大唐环境产业集团股份有限公司 | A kind of desulfurizer mist eliminator differential pressure measurement pipeline automatic blowout device and blowing method |
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2020
- 2020-01-07 CN CN202010012330.8A patent/CN111076861B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252715A (en) * | 2011-04-15 | 2011-11-23 | 王荣虎 | Europa sensor and flow measurement control system |
| CN202885874U (en) * | 2012-10-08 | 2013-04-17 | 河北钢铁股份有限公司承德分公司 | Coal gas flow measuring device with functions of blowing and discharging pollution |
| CN102998151A (en) * | 2012-12-18 | 2013-03-27 | 中冶焦耐工程技术有限公司 | Automatic maintenance-free coke oven gas sampling system |
| CN203155676U (en) * | 2013-04-03 | 2013-08-28 | 山西太钢不锈钢股份有限公司 | Anti-clogging device for pressure measuring pipe |
| KR101457846B1 (en) * | 2014-04-19 | 2014-11-05 | 사단법인 한국화재보험협회 | Experimental apparatus of flame propagation prevention damper |
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| CN105784020A (en) * | 2016-04-21 | 2016-07-20 | 承德菲时博特自动化设备有限公司 | Rectangular needle tube flowmeter |
| CN206695848U (en) * | 2017-04-06 | 2017-12-01 | 上海苏能科技开发有限公司 | Continuous purging block-resistant type apparatus for measuring air quantity |
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| CN111076861B (en) | 2021-10-08 |
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