CN113007728B - Anti-freezing control scheme for RTO inlet valve in severe cold area - Google Patents
Anti-freezing control scheme for RTO inlet valve in severe cold area Download PDFInfo
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- CN113007728B CN113007728B CN202110264447.XA CN202110264447A CN113007728B CN 113007728 B CN113007728 B CN 113007728B CN 202110264447 A CN202110264447 A CN 202110264447A CN 113007728 B CN113007728 B CN 113007728B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention provides an anti-freezing control scheme for an RTO inlet valve in a severe cold area, and relates to the fields of environmental protection, energy conservation and emission reduction. The antifreezing control scheme of the RTO inlet valve in the severe cold area comprises an MR1 valve, an MR2 valve, an MR3 valve, a KPR system, a chimney and an RTO, and comprises the following control steps: preheating; and step two, freezing and thawing. Preheating twice through dividing the RTO to and rotate the valve plate of MR2 valve to the closed condition with minimum corner from freezing the side, the valve plate of MR1 valve rotates and reaches the mode control MR1 valve and MR2 valve of open mode from ice platform side, makes KPR system's compressed waste gas let in the RTO and carries out combustion processing, makes KPR system's hot-blast ice that will condense melt, the condition that freezing hinders the valve and open when can effectively prevent the VOC waste gas restart that the automotive painting workshop produced in severe cold district.
Description
Technical Field
The invention relates to the fields of environmental protection, energy conservation and emission reduction, in particular to an anti-freezing control scheme of an RTO inlet valve in a severe cold area.
Background
According to the national environmental protection regulation, the VOC waste gas that produces in the automobile painting workshop need handle just can discharge, and most exhaust-gas treatment schemes all concentrate workshop waste gas earlier at present, use RTO to burn the waste gas after the concentration again, and pyrolysis becomes harmless gases such as carbon dioxide and water and discharges. The RTO is used in winter in severe cold areas, the inlet valve is frozen when the RTO is closed after a workshop is shut down, and the system is started again because the valve is frozen and cannot act.
Generally, two interlocking valves are arranged at an RTO inlet in an exhaust gas treatment system, see fig. 1, the two valves are respectively marked as MR1 and MR2, the MR1 valve is opened when the system is normally used, the MR2 and MR3 valves are closed, the MR1 valve is closed when the RTO stops running after a workshop is stopped, the MR2 and MR3 valves are opened, the RTO is used in winter in a severe cold area, and when the RTO is restarted after the workshop resumes production, the MR1 and MR2 valves can be frozen, and the system cannot be influenced in operation.
RTO is used in winter in severe cold areas, the valve MR1 can be frozen at a position close to a concentrated waste gas source after being stopped for a long time, as shown in figure 2, hot air with relatively high temperature is arranged on the left side of a valve plate of the valve MR1 during the stop of production, cold air rushing from a fresh air valve is arranged on the right side of the valve plate, and condensed water is separated out when the hot air on the left side of the valve plate is cooled and falls to the lower part of the valve, and is contacted with an air pipe to freeze, so that an ice platform is gradually formed to block the action of the valve; the valve MR2 can also freeze at the position where the valve is close to the concentrated waste gas source after being stopped for a long time, see figure 3, because high-temperature air is discharged to a chimney from a desorption outlet, the temperature is reduced under the influence of outdoor cold air in the rising process, condensed water is separated out and drips to the valve plate of the MR2 to freeze and gradually gather to form an ice platform to block the action of the valve.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an anti-freezing control scheme of an RTO inlet valve in a severe cold area, which solves the problem that when the VOC waste gas generated in an automobile coating workshop in the severe cold area is subjected to RTO combustion treatment, the MR1 valve and the MR2 valve are frozen to prevent the valves from being opened due to the fact that the RTO stops running after the workshop is stopped.
(II) technical scheme
In order to realize the purpose, the invention is realized by the following technical scheme: an anti-freezing control scheme for an RTO inlet valve in a severe cold area comprises an MR1 valve, an MR2 valve, an MR3 valve, a KPR system, a chimney and an RTO, and comprises the following control steps:
the method comprises the following steps: preheating
Preheating the RTO, starting the KPR system when the temperature is preheated to 720 ℃, keeping the MR1 valve, the MR2 valve and the MR3 valve from acting, and keeping the original state, wherein in the process, the MR3 valve continuously supplies air to the RTO, and hot air generated by the KPR system is discharged to a chimney from the MR2 valve;
step two: freeze and thaw
Preheating in the RTO to 820 ℃, rotating a valve plate of the MR2 valve from an icing side to a closed state at a minimum rotation angle, closing the MR3 valve, then rotating the valve plate of the MR1 valve away from an ice platform side to reach an open state, and melting the icing at the MR1 valve and the MR2 valve by hot air of a KPR system in the process.
Preferably, the RTO is a regenerative oxidation furnace.
Preferably, the MR1 valve is in a closed state before the RTO is warmed up, and the MR2 valve and the MR3 valve are both in an open state before the RTO is warmed up.
Preferably, the chimney is an exhaust gas discharge structure of the KPR system.
Preferably, the ice table side of the MR1 valve is located at the low side of the KPR system discharging the concentrated exhaust gas to the MR1 valve.
Preferably, the icing side of the MR2 valve is positioned on the side of the valve plate which is obliquely downwards opened.
(III) advantageous effects
The invention provides an anti-freezing control scheme for an RTO inlet valve in a severe cold area. The method has the following beneficial effects:
according to the invention, the RTO is preheated twice, the valve plate of the MR2 valve is rotated to a closed state from an icing side at a minimum rotation angle, the MR1 valve and the MR2 valve are controlled in a mode that the valve plate of the MR1 valve is rotated away from the ice platform side to reach an open state, compressed waste gas of the KPR system is introduced into the RTO for combustion treatment, condensed ice is melted by hot air of the KPR system, and the condition that the icing valve is blocked to open when VOC waste gas generated in an automobile painting workshop in a severe cold area is restarted can be effectively prevented.
Drawings
FIG. 1 is a schematic diagram of a prior art RTO inlet portion of the type referred to in the present application;
FIG. 2 is a schematic illustration of the icing of a prior art MR1 valve according to the present invention;
FIG. 3 is a schematic illustration of the prior art MR2 valve icing referred to in this invention;
fig. 4 is a schematic view of the antifreeze valve scheme of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example (b):
as shown in fig. 4, an embodiment of the present invention provides an anti-freezing control scheme for an RTO inlet valve in a severe cold area, including an MR1 valve, an MR2 valve, an MR3 valve, a KPR system, a chimney, and an RTO, where the RTO is a regenerative thermal oxidation furnace, and includes the following control steps:
the method comprises the following steps: preheating
Preheating the RTO, wherein the MR1 valve is in a closed state before the RTO is preheated, when the MR1 valve is stopped, the temperature of compressed waste gas from a KPR system on the left side of the MR1 valve is higher than that when the RTO on the right side is not started, so that an ice platform is positioned on one side, with lower height, of the KPR system for discharging concentrated waste gas to the MR1 valve, and is condensed, the MR2 valve and the MR3 valve are both in an open state before the RTO is preheated, the icing side of the MR2 valve is positioned on one side with the valve plate opened and inclined downwards, the icing reason is condensation when the compressed waste gas of the KPR system is discharged, the RTO starts the KPR system when being preheated to 720 ℃, and at the moment, the MR1 valve, the MR2 valve and the MR3 valve do not act, the original state is maintained, in the process, the MR3 valve continuously supplies air to the RTO to meet the preheating requirement of the RTO, and hot wind containing the waste gas generated by the KPR system is continuously discharged to a chimney from the MR2 valve;
step two: thawing of ice
After the preheating temperature in the RTO is increased to 820 ℃, a valve plate of the MR2 valve is rotated to a closed state from an icing side at a minimum rotation angle, so that ice formed at the MR2 valve can be prevented from blocking the rotation of the valve plate of the MR2 valve, and the MR3 valve is closed, and thus compressed waste gas from the KPR system can enter the RTO through the MR1 valve which is opened in a way that the valve plate of the MR1 valve is rotated away from an ice platform side for combustion treatment, in the process, hot air of the KPR system is enough to melt the icing at the MR1 valve and the MR2 valve, so that residual compressed waste gas in the KPR system is prevented, and the program of an automobile coating workshop sets that when the automobile coating workshop is shut down each time, the air of a paint spraying chamber is not sent into the KPR system, the shutdown is delayed, and the delay time is long so as to ensure that the residual compressed waste gas in the KPR system is completely blown.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An anti-freezing control scheme for an RTO inlet valve in a severe cold area comprises an MR1 valve, an MR2 valve, an MR3 valve, a KPR system, a chimney and an RTO, and is characterized by comprising the following control steps:
the method comprises the following steps: preheating
Preheating the RTO, starting the KPR system when the temperature is preheated to 720 ℃, keeping the MR1 valve, the MR2 valve and the MR3 valve from acting, and keeping the original state, wherein in the process, the MR3 valve continuously supplies air to the RTO, and hot air generated by the KPR system is discharged to a chimney from the MR2 valve;
step two: freeze and thaw
Preheating in the RTO to 820 ℃, rotating a valve plate of the MR2 valve from an icing side to a closed state at a minimum rotation angle, closing the MR3 valve, then rotating the valve plate of the MR1 valve away from an ice platform side to reach an open state, and melting the icing at the MR1 valve and the MR2 valve by hot air of a KPR system in the process.
2. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, characterized in that: the RTO is a regenerative oxidation furnace.
3. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, characterized in that: the MR1 valve is in a closed state before the RTO is preheated, and the MR2 valve and the MR3 valve are both in an open state before the RTO is preheated.
4. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, characterized in that: the chimney is a waste gas discharge structure of the KPR system.
5. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, wherein: the ice table side of the MR1 valve is positioned at the low side of the KPR system which discharges the concentrated exhaust gas to the MR1 valve.
6. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, wherein: the icing side of the MR2 valve is positioned on the side of the valve plate which is opened and inclined downwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110264447.XA CN113007728B (en) | 2021-03-11 | 2021-03-11 | Anti-freezing control scheme for RTO inlet valve in severe cold area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110264447.XA CN113007728B (en) | 2021-03-11 | 2021-03-11 | Anti-freezing control scheme for RTO inlet valve in severe cold area |
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| CN113007728A CN113007728A (en) | 2021-06-22 |
| CN113007728B true CN113007728B (en) | 2023-03-31 |
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| CN205781336U (en) * | 2016-05-30 | 2016-12-07 | 深圳中广核工程设计有限公司 | The antifreeze air-valve of used in nuclear power station |
| CN108310898A (en) * | 2018-04-18 | 2018-07-24 | 山东豪迈机械制造有限公司 | A kind of exhaust gas processing device |
| CN111983349A (en) * | 2020-08-10 | 2020-11-24 | 国网湖南省电力有限公司 | Natural environment simulated ice melting and dancing elimination test method and system for power transmission line |
| CN112260198A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09287784A (en) * | 1996-04-23 | 1997-11-04 | Daikin Ind Ltd | Ice heat accumulating device |
| JPH1182962A (en) * | 1997-09-01 | 1999-03-26 | Nkk Corp | Thermally decomposing and melting furnace of waste |
| US20170350322A1 (en) * | 2016-06-02 | 2017-12-07 | Hamilton Sundstrand Corporation | Heated starter air valve |
| CN108980839B (en) * | 2018-06-05 | 2019-10-25 | 江苏天楹环保能源成套设备有限公司 | A kind of dump pit heating defrosting system |
| CN212039799U (en) * | 2019-12-16 | 2020-12-01 | 衡水京华化工有限公司 | Processing apparatus of tail gas that produces in sebacic acid production process |
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- 2021-03-11 CN CN202110264447.XA patent/CN113007728B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205781336U (en) * | 2016-05-30 | 2016-12-07 | 深圳中广核工程设计有限公司 | The antifreeze air-valve of used in nuclear power station |
| CN108310898A (en) * | 2018-04-18 | 2018-07-24 | 山东豪迈机械制造有限公司 | A kind of exhaust gas processing device |
| CN111983349A (en) * | 2020-08-10 | 2020-11-24 | 国网湖南省电力有限公司 | Natural environment simulated ice melting and dancing elimination test method and system for power transmission line |
| CN112260198A (en) * | 2020-09-28 | 2021-01-22 | 北京交通大学 | Multifunctional rail transit direct-current online ice melting system and method |
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Address after: No. 1958, Chuangye street, Changchun automobile economic and Technological Development Zone, Changchun City, Jilin Province, 130011 Applicant after: The Ninth Design and Research Institute of Machinery Industry Co.,Ltd. Address before: No. 1958, Chuangye street, Changchun automobile economic and Technological Development Zone, Changchun City, Jilin Province, 130011 Applicant before: Machinery Industry Ninth Design and Research Institute Co.,Ltd. |
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