CN113007728A - 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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- CN113007728A CN113007728A CN202110264447.XA CN202110264447A CN113007728A CN 113007728 A CN113007728 A CN 113007728A CN 202110264447 A CN202110264447 A CN 202110264447A CN 113007728 A CN113007728 A CN 113007728A
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- valve
- rto
- kpr
- severe cold
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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 region 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. Through preheating twice to the RTO to and rotate the valve plate of MR2 valve to the closed condition with minimum corner from freezing the side, the mode that the valve plate of MR1 valve rotated the ice platform side and reached the open mode controls MR1 valve and MR2 valve, makes the compressed waste gas of KPR system let in the RTO and carry out combustion process, makes the hot-blast ice that will condense of KPR system melt, the condition that freezing hinders the valve and open when can effectively prevent the VOC waste gas that severe cold area automobile painting workshop produced from restarting.
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, as shown in FIG. 1, the two valves are respectively marked as MR1 and MR2, when the system is in normal use, the MR1 valve is opened, 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 are frozen and cannot act to influence the system 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 production is 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 MR1 valve during production stop, 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, contacts with an air pipe and is frozen to gradually form an ice platform 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 stopping production 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 drops to the MR2 valve plate 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 valves are blocked to open due to the fact that the RTO stops running after the workshop stops production, and the MR1 valve and the MR2 valve are frozen.
(II) technical scheme
In order to achieve 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 region 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 RTO 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: thawing of ice
After the temperature is preheated to 820 ℃ in the RTO, a valve plate of the MR2 valve is rotated to a closed state from an icing side at a minimum rotation angle, the MR3 valve is closed, then the valve plate of the MR1 valve is rotated away from an ice platform side to reach an open state, and the ice at the MR1 valve and the MR2 valve is melted by hot air of a KPR system in the process.
Preferably, the RTO is a regenerative thermal oxidizer.
Preferably, the MR1 valve is in a closed state before the RTO warms up, and the MR2 valve and the MR3 valve are both in an open state before the RTO warms 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 on 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 located on the side of the valve plate which is inclined downwards when the valve plate is 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 for two times, the MR1 valve and the MR2 valve are controlled in a mode that the valve plate of the MR2 valve rotates to a closed state from an icing side at a minimum rotation angle, and the valve plate of the MR1 valve rotates away from an ice platform side to reach an open state, so that 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 situation that the valve is blocked to open due to icing when VOC waste gas generated in an automobile coating workshop in a severe cold region is restarted can be effectively prevented.
Drawings
FIG. 1 is a schematic diagram of an RTO inlet portion of the present invention;
FIG. 2 is a schematic illustration of the MR1 valve icing of the present invention;
FIG. 3 is a schematic illustration of the MR2 valve icing of the present 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 4, an embodiment of the present invention provides an antifreeze 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 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 at the left side of the MR1 valve is higher than that when the RTO at the right side is not started, so that an ice platform condenses at the side, with lower height, of the KPR system discharging concentrated waste gas to the MR1 valve, 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 at the side with the valve plate opening obliquely downwards, the icing reason is caused by the condensation when the compressed waste gas of the KPR system is discharged, the RTO starts the KPR system when the temperature is preheated to 720 ℃, and the MR1 valve, the MR2 valve and the MR3 valve do not act and are kept as original states, 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 from the MR2 to;
step two: thawing of ice
After the temperature is preheated to 820 ℃ in the RTO, a valve plate of an 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 a valve plate of an MR2 valve, the MR3 valve is closed, compressed waste gas from a KPR system can enter the RTO through an MR1 valve which is opened in a mode that the valve plate of the MR1 valve is rotated away from an ice platform side for combustion treatment, hot air of the KPR system is enough to melt the icing at the MR1 valve and the MR2 valve in the process, in order to prevent residual compressed waste gas in the KPR system, the program of an automobile coating workshop sets that the air of a paint spraying chamber is not sent into the KPR system any more and the shutdown is delayed, and the delay time is long to ensure that the residual compressed waste gas in the KPR system is purged completely.
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 region 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 RTO 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: thawing of ice
After the temperature is preheated to 820 ℃ in the RTO, a valve plate of the MR2 valve is rotated to a closed state from an icing side at a minimum rotation angle, the MR3 valve is closed, then the valve plate of the MR1 valve is rotated away from an ice platform side to reach an open state, and the ice at the MR1 valve and the MR2 valve is melted 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, wherein: 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, wherein: the MR1 valve was in a closed state before the RTO warmed up, and the MR2 valve and MR3 valve were both in an open state before the RTO warmed up.
4. The antifreeze control scheme of the RTO inlet valve in the severe cold region as claimed in claim 1, wherein: 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 bank side of the MR1 valve was located on the low side of the KPR system that discharged 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 located on the side of the valve plate which is inclined downwards when the valve plate is opened.
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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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| 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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| CN113007728B CN113007728B (en) | 2023-03-31 |
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Citations (9)
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|---|---|---|---|---|
| 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 |
| 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 |
| US20170350322A1 (en) * | 2016-06-02 | 2017-12-07 | Hamilton Sundstrand Corporation | Heated starter air valve |
| 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 |
| CN108980839A (en) * | 2018-06-05 | 2018-12-11 | 江苏天楹环保能源成套设备有限公司 | A kind of dump pit heating defrosting system |
| 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 |
| 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 |
| 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 |
-
2021
- 2021-03-11 CN CN202110264447.XA patent/CN113007728B/en active Active
Patent Citations (9)
| 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 |
| 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 |
| US20170350322A1 (en) * | 2016-06-02 | 2017-12-07 | Hamilton Sundstrand Corporation | Heated starter air valve |
| 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 |
| CN108980839A (en) * | 2018-06-05 | 2018-12-11 | 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 |
| 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 |
Non-Patent Citations (1)
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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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