CN117450523A - Method for controlling safe air inlet of RTO front end - Google Patents
Method for controlling safe air inlet of RTO front end Download PDFInfo
- Publication number
- CN117450523A CN117450523A CN202311641243.9A CN202311641243A CN117450523A CN 117450523 A CN117450523 A CN 117450523A CN 202311641243 A CN202311641243 A CN 202311641243A CN 117450523 A CN117450523 A CN 117450523A
- Authority
- CN
- China
- Prior art keywords
- gas
- liquid separation
- separation tank
- rto
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000001301 oxygen Substances 0.000 claims abstract description 44
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000000926 separation method Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000002912 waste gas Substances 0.000 claims abstract description 29
- 238000004880 explosion Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
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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
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
-
- 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
- F23G5/006—General arrangement of incineration plant, e.g. flow sheets
-
- 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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
-
- 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
- F23G5/46—Recuperation of heat
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention belongs to the technical field of automatic control of instruments, and provides a method for controlling safe air intake of an RTO front end. The gas-liquid separation tank collects the waste gas from each unit in the factory, and the gas-liquid separation tank sends the waste gas to the RTO equipment for combustion treatment through a pipeline, so that the waste gas discharged to the atmosphere after treatment is ensured to meet the environmental protection requirement. The oxygen content of the exhaust gas entering the RTO device is uncertain and in order to ensure that the exhaust gas is not at the explosion limit, it is required that the oxygen volume concentration in the exhaust gas does not exceed the interlock value α. The invention sets multiple explosion-proof measures; firstly, 3 oxygen analyzers take values, so that high safety and high availability are ensured; second, during reset, CO 2 Or N 2 The oxygen concentration of the entering waste gas can be ensured not to exceed a dangerous value; third, under more severe conditions, two gas-liquid separation tanks ensure that more exhaust gas can be contained.
Description
Technical Field
The invention belongs to the technical field of automatic control of meters, and relates to a process for controlling the inlet air of an RTO front end and a meter flow, in particular to a safety control method for the inlet air of the RTO front end in an explosive gas environment.
Background
The principle of regenerative incinerator (RTO) is that organic waste gas is heated to 750 deg.C or higher by natural gas thermal oxidation, and after staying in combustion chamber for 0.7-1.0 s, VOCs in the waste gas is oxidatively decomposed into CO 2 And H 2 O。
When the concentration of combustible gas or vapor in the air is below the lower explosion limit or above the upper explosion limit, the gaseous environment cannot be exploded.
The high-concentration waste gas from each unit of the factory is collected in the gas-liquid separation tank, and is sent to the RTO equipment for combustion treatment through a pressure difference by pipelines, so that the concentration of the waste gas entering the RTO is required to be lower than the lower explosion limit or higher than the upper explosion limit, and the concentration of the waste gas is required to be higher than the upper explosion limit because the waste gas is high-concentration waste gas.
Disclosure of Invention
The invention aims to provide a method for controlling safe air intake of an RTO front end.
The technical scheme of the invention is as follows:
the device for controlling the safe air intake of the RTO front end mainly comprises a first gas-liquid separation tank 1, a second gas-liquid separation tank 2, a first oxygen analyzer 3, a second oxygen analyzer 4, a third oxygen analyzer 5, a fan 6, a first switch valve 7, a second switch valve 8, a first pipeline 9, a flowmeter 10, a regulating valve 11, an ignition controller 12, RTO equipment 13, a second pipeline 14, a third pipeline 15 and a fourth pipeline 16, wherein the oxygen analyzer, the fan 6, the switch valve, the flowmeter 10, the regulating valve 11 and the ignition controller 12 are all connected with a Programmable Logic Controller (PLC), and the programmable logic controller realizes the control of the device through collected signals and settings;
the waste gas from each unit of the factory enters the first gas-liquid separation tank 1 and the second gas-liquid separation tank 2 through the first pipeline 9, the first gas-liquid separation tank 1 and the second gas-liquid separation tank 2 are connected with the ignition controller 12 after being converged through the pipelines, and three oxygen analyzers and a first switch valve 7 are sequentially arranged on the first pipeline 9 between the gas-liquid separation tank and the ignition controller 12; CO 2 Or N 2 The gas is connected with the ignition controller 12 through a fourth pipeline 16, and the fourth pipeline 16 is provided with a flowmeter 10 and a regulating valve 11; the ignition controller 12 is connected with the RTO device 13; the fan 6 is connected with the ignition controller 12 through a third pipeline 15, and a second switch valve 8 is arranged on the third pipeline 15 of the fan and the ignition controller.
The waste gas from each unit of the factory is collected in the gas-liquid separation tank, and the gas-liquid separation tank sends the waste gas to the RTO equipment 13 through the second pipeline 14 for combustion treatment, so that the waste gas discharged into the atmosphere after treatment can meet the environmental protection requirement. The oxygen content of the exhaust gas entering the RTO device 13 is uncertain and in order to ensure that the exhaust gas is not at an explosion limit, it is required that the oxygen volume concentration in the exhaust gas does not exceed the interlock value a.
The normal pressure value of the gas-liquid separation tank is between 0.2kPa and 0.5kPa, under the action of pressure difference, waste gas enters RTO equipment 13 through a second pipeline 14, the flow rate of the waste gas is set to be beta m/s, and during normal conveying, a fan 6, a first switch valve 7 and a second switch valve 8 are all in an open state, and a regulating valve 11 is in a closed state; when the two values of the 3 oxygen analyzers are higher than alpha, the fan 6, the first switch valve 7 and the second switch valve 8 are closed, and the exhaust gas is prevented from entering the RTO equipment 13.
When resetting, firstly, the regulating valve 11 is opened, at this time, the opening of the regulating valve 11 is regulated by the flowmeter 10, and the set value of the flowmeter 10 is calculated by the oxygen analyzer value, and the calculation is as follows:
wherein x isOxygen analyzer values; y is CO 2 Or N 2 A flow rate;
after the regulating valve 11 is opened, the first switch valve 7, the second switch valve 8 and the fan 6 are sequentially opened;
when the distance from the oxygen analyzer to the first switch valve 7 is a meters, the response time of the oxygen analyzer on the programmable logic controller is b seconds, and when the response time of the first switch valve 7 on the programmable logic controller is c seconds, the following relationship is ensured:
it is ensured that the measured oxygen content of the exhaust gases does not enter the RTO device 13 when the oxygen content exceeds the standard.
In special cases, when the exhaust gas cannot reach the condition of entering the RTO device 13 and the pressure in the first gas-liquid separation tank 1 is too high or more exhaust gas cannot be contained, the second gas-liquid separation tank 2 is started, and the exhaust gas enters the second gas-liquid separation tank 2.
The invention has the following effects and benefits: the invention sets multiple explosion-proof measures; firstly, 3 oxygen analyzers take values, so that high safety and high availability are ensured; second, during reset, CO 2 Or N 2 The oxygen concentration of the entering waste gas can be ensured not to exceed a dangerous value; third, under more severe conditions, two gas-liquid separation tanks ensure that more exhaust gas can be contained.
Drawings
FIG. 1 is a method of the present invention for controlling the safe intake of an RTO front end.
In the figure: a first gas-liquid separation tank 1, a second gas-liquid separation tank 2, a first oxygen analyzer 3, a second oxygen analyzer 4, a third oxygen analyzer 5, a fan 6, a first switch valve 7, a second switch valve 8, a first pipeline 9, a flowmeter 10, a regulating valve 11, an ignition controller 12, a 13RTO device and a second pipeline 14; 15 a third pipeline; 16 fourth line.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the technical scheme and the accompanying drawings.
Examples:
the oxygen content of the exhaust gas entering the RTO is uncertain and the present invention requires that the oxygen concentration in the exhaust gas does not exceed 5% in order to ensure that the exhaust gas is not at the explosion limit.
The normal pressure value of the gas-liquid separation tank is between 0.2kPa and 0.5kPa, waste gas enters RTO through a pipeline under the action of pressure difference, the flow rate of the waste gas is set to be 8 m/s, and during normal conveying, the fan 6, the first switch valve 7 and the second switch valve 8 are all in an open state, and the regulating valve 11 is in a closed state.
When the two values of the 3 oxygen analyzers are higher than 5%, the fan 6, the first switch valve 7 and the second switch valve 8 are closed, and waste gas is prevented from entering the RTO.
When resetting, the regulating valve is opened first, and at this time, the opening of the regulating valve 11 is regulated by the value of the flowmeter 10, and the set value of the flowmeter 10 is calculated by the value of the oxygen analyzer.
The calculation is as follows:
to ensure that the oxygen concentration in the exhaust entering the RTO is below 5%.
After the regulating valve is opened for 5 seconds, the first switch valve 7, the second switch valve 8 and the fan 6 are sequentially opened.
When the distance from the oxygen analyzer to the first switching valve 7 is 150 m, the response time of the oxygen analyzer is 6 seconds, and when the response time of the switching valve is 5 seconds, it is ensured that the relationship thereof is as follows:
when the oxygen content of the measured waste gas exceeds 5%, the switch valve is timely closed when the waste gas does not reach the switch valve, and dangerous waste gas is prevented from entering RTO.
In addition to ensuring safety in hazardous environments by multiple measures, the invention requires attention to response time when selecting an oxygen analyzer and a switch valve.
Claims (2)
1. The method for controlling the RTO front-end safe air intake is characterized in that a device used by the method mainly comprises a first gas-liquid separation tank (1), a second gas-liquid separation tank (2), a first oxygen analyzer (3), a second oxygen analyzer (4), a third oxygen analyzer (5), a fan (6), a first switching valve (7), a second switching valve (8), a flowmeter (10), a regulating valve (11), an ignition controller (12), RTO equipment (13) and a pipeline, wherein the oxygen analyzer, the fan (6), the switching valve, the flowmeter (10), the regulating valve (11) and the ignition controller (12) are all connected with a programmable logic controller, and the programmable logic controller realizes the control of the device through collected signals and settings;
waste gas from each unit in a factory enters a first gas-liquid separation tank (1) and a second gas-liquid separation tank (2) through pipelines, the first gas-liquid separation tank (1) and the second gas-liquid separation tank (2) are connected with an ignition controller (12) after being converged through the pipelines, and three oxygen analyzers and a first switch valve (7) are sequentially arranged on the pipeline between the gas-liquid separation tank and the ignition controller (12); CO 2 Or N 2 The gas is connected with an ignition controller (12) through a pipeline, and the pipeline is provided with a flowmeter (10) and a regulating valve (11); the ignition controller (12) is connected with the RTO equipment (13); the fan (6) is connected with the ignition controller (12) through a pipeline, and a second switch valve (8) is arranged on the pipeline of the fan and the ignition controller;
the waste gas from each unit of the factory is collected in a gas-liquid separation tank, and the waste gas is sent to RTO equipment (13) for combustion treatment through a pipeline by the gas-liquid separation tank; the oxygen content of the exhaust gas entering the RTO device (13) is uncertain, in order to ensure that the exhaust gas is not at the explosion limit, it is required that the oxygen volume concentration in the exhaust gas does not exceed the interlock value α;
the normal pressure value of the gas-liquid separation tank is between 0.2kPa and 0.5kPa, and under the action of pressure difference, waste gas enters RTO equipment (13) through a pipeline; setting the flow rate of the waste gas to be beta m/s, and during normal conveying, opening the fan (6), the first switch valve (7) and the second switch valve (8) and closing the regulating valve (11); when two values of the 3 oxygen analyzers are higher than alpha, the fan (6), the first switch valve (7) and the second switch valve (8) are closed, and waste gas is prevented from entering the RTO equipment (13);
when resetting, firstly, the regulating valve (11) is opened, at the moment, the opening of the regulating valve (11) is regulated through the flowmeter (10), the set value of the flowmeter (10) is obtained by calculation through an oxygen analyzer value, and the calculation is as follows:
wherein x is an oxygen analyzer value; y is CO 2 Or N 2 A flow rate;
the first switch valve (7), the second switch valve (8) and the fan (6) are sequentially opened after the regulating valve (11) is opened;
when the distance from the oxygen analyzer to the first switch valve (7) is a meters, the response time of the oxygen analyzer on the programmable logic controller is b seconds, and when the response time of the first switch valve (7) on the programmable logic controller is c seconds, the following relation is ensured:
ensuring that the measured oxygen content of the exhaust gas is out of specification, the exhaust gas cannot enter the RTO device (13).
2. The method for controlling the safe intake of an RTO front-end according to claim 1, characterized in that the second gas-liquid separation tank (2) is activated when the exhaust gas does not reach the condition of entering the RTO device (13) and the pressure in the first gas-liquid separation tank (1) is too high or no more exhaust gas can be taken down, the exhaust gas will enter the second gas-liquid separation tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311641243.9A CN117450523A (en) | 2023-12-04 | 2023-12-04 | Method for controlling safe air inlet of RTO front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311641243.9A CN117450523A (en) | 2023-12-04 | 2023-12-04 | Method for controlling safe air inlet of RTO front end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117450523A true CN117450523A (en) | 2024-01-26 |
Family
ID=89583780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311641243.9A Pending CN117450523A (en) | 2023-12-04 | 2023-12-04 | Method for controlling safe air inlet of RTO front end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117450523A (en) |
-
2023
- 2023-12-04 CN CN202311641243.9A patent/CN117450523A/en active Pending
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