CN111023118A - Tail gas combustion treatment method and system - Google Patents
Tail gas combustion treatment method and system Download PDFInfo
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- CN111023118A CN111023118A CN201911039078.3A CN201911039078A CN111023118A CN 111023118 A CN111023118 A CN 111023118A CN 201911039078 A CN201911039078 A CN 201911039078A CN 111023118 A CN111023118 A CN 111023118A
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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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
- F23G2207/104—Arrangement of sensing devices for CO or CO2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/30—Oxidant supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/40—Supplementary heat supply
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- 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
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Abstract
The invention discloses a tail gas combustion treatment method and a tail gas combustion treatment system, wherein the treatment method comprises the following steps: the method comprises the steps of obtaining the content of CO in tail gas and the flow rate of the tail gas, calculating to obtain the flow rate of combustion-supporting air required by combustion of the tail gas, and controlling to input only the tail gas and the combustion-supporting air with corresponding flow rate into combustion equipment for combustion when the content of CO in the tail gas is higher than a set threshold value; and when the content of CO in the tail gas is lower than a set threshold value, calculating to obtain the flow of the combustion-supporting gas required by the combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion-supporting gas, and controlling to input the combustion-supporting gas, the combustion-supporting air of the combustion-supporting gas and the tail gas and the combustion-supporting air of the tail gas into the combustion equipment for CO-combustion. The tail gas combustion treatment method and the tail gas combustion treatment system provided by the invention have the advantages that the tail gas can be stably combusted, the combustion cost is reduced, the environmental pollution and the energy waste caused by the exhaust of the tail gas are avoided, and the environmental benefit and the economic benefit are higher.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production by a chlorination process, and particularly relates to a tail gas combustion treatment method and a tail gas combustion treatment system.
Background
In the current electric stove smelting and the production of chlorination process titanium dioxide, can produce a large amount of tail gases, wherein carbon monoxide content is very high and the content is very unstable, because carbon monoxide content is unstable in this tail gas, the unable safety control burning of ordinary combustor, generally all passes through the torch with tail gas and empties the burning, causes a large amount of energy extravagant. How to adapt to the current severe environment-friendly situation, achieve energy conservation and emission reduction, and reduce the production cost is the key for the survival of chemical enterprises. Therefore, it is necessary to develop a method and a system for combustion treatment of titanium dioxide tail gas by chlorination process.
Disclosure of Invention
The invention aims to provide a tail gas combustion treatment method and a tail gas combustion treatment system for solving the defects of the prior art, so that titanium dioxide tail gas produced by a chlorination process can be safely combusted, and the aims of saving energy and reducing emission are fulfilled.
The purpose of the invention is realized by the following technical scheme:
a tail gas combustion treatment method, which adopts combustion equipment to combust tail gas, comprises the following steps: acquiring the content of CO in the tail gas and the flow of the tail gas, calculating to obtain the flow of combustion-supporting air required by the combustion of the tail gas, and controlling to input only the tail gas and the combustion-supporting air with corresponding flow into the combustion equipment for combustion when the content of CO in the tail gas is higher than a set threshold value; and when the content of CO in the tail gas is lower than a set threshold value, calculating to obtain the flow of the combustion accompanying gas required by the combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion accompanying gas, and controlling the combustion accompanying gas with the required flow, the combustion-supporting air with the flow required by the combustion of the combustion accompanying gas, the tail gas and the combustion-supporting air with the flow required by the combustion of the tail gas to be input into the combustion equipment for CO-combustion.
Preferably, the calculation of the flow rate of the combustion-supporting air required by the combustion of the tail gas is realized by the following steps: and obtaining the flow of the tail gas input into the combustion equipment and the content of CO in the tail gas, calculating to obtain the flow of the CO input into the combustion equipment, further calculating to obtain the flow of combustion-supporting air required by the combustion of the tail gas, and increasing a set margin coefficient according to the flow of the combustion-supporting air to obtain the final flow of the combustion-supporting air required by the combustion of the tail gas.
Preferably, the flow rate of the combustion-supporting air required by the combustion of the combustion-supporting accompanying gas is obtained by increasing a set margin coefficient according to the flow rate of the combustion-supporting air required by the combustion of the combustion-supporting accompanying gas.
Preferably, the method further comprises the steps of obtaining the oxygen content in the flue gas generated after the tail gas is combusted, and adjusting the allowance coefficient of the combustion-supporting air according to the obtained oxygen content in the flue gas; and when the oxygen content in the flue gas is lower than a set threshold value, controlling to stop inputting the tail gas and the co-combustion gas into the combustion equipment.
Preferably, the method further comprises the step of acquiring a flame state value of combustion in the combustion equipment, and controlling to stop inputting the tail gas and the combustion accompanying gas into the combustion equipment when the flame state value is lower than a set threshold value.
The invention also provides a tail gas combustion treatment system, which comprises a burner and an incinerator, wherein the burner comprises a tail gas inlet chamber, a tail gas combustion-supporting air inlet chamber, a co-combustion gas inlet chamber and a co-combustion gas combustion-supporting air inlet chamber which are mutually independent, one end of each of the tail gas inlet chamber, the tail gas combustion-supporting air inlet chamber, the co-combustion gas inlet chamber and the co-combustion gas combustion-supporting air inlet chamber is respectively connected with the tail gas inlet system, the tail gas combustion-supporting air inlet system, the co-combustion gas inlet system and the co-combustion gas combustion-supporting air inlet system, the other end of each of the tail gas inlet chamber, the tail gas combustion-supporting air inlet chamber and the co-combustion gas; the tail gas inlet system, the tail gas combustion-supporting air inlet system, the combustion accompanying gas inlet system and the combustion accompanying gas combustion-supporting air inlet system are all provided with a flow meter and a flow regulating valve, and the tail gas inlet system is also provided with a CO content analyzer;
the control system is used for receiving the CO content in the tail gas detected by the CO content analyzer and the tail gas flow detected by the flowmeter, calculating to obtain the flow of combustion-supporting air required by combustion of the tail gas, and controlling the flow regulating valve to input the tail gas and the combustion-supporting air with corresponding flow to the tail gas inlet chamber and the tail gas combustion-supporting air inlet chamber respectively and burn in the hearth of the incinerator when the CO content is higher than a set threshold value; when the CO content is lower than a set threshold value, calculating to obtain the flow of the combustion-supporting gas required by the combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion-supporting gas, controlling the flow regulating valve, inputting the combustion-supporting gas with the corresponding flow and the combustion-supporting air with the flow required by the combustion of the combustion-supporting gas into the combustion-supporting gas inlet chamber and the combustion-supporting air inlet chamber respectively, and carrying out CO-combustion with the combustion-supporting air with the flow required by the combustion of the tail gas and the tail gas in the hearth of the incinerator.
Preferably, fire arresters are further arranged on the tail gas inlet system and the combustion accompanying gas inlet system.
Preferably, the tail gas air inlet system, the tail gas combustion-supporting air inlet system and the combustion-supporting air inlet system of the combustion-supporting gas are also provided with pressure transmitters connected with the control system, the pressure transmitters are used for detecting the pressure of the tail gas air inlet system, the tail gas combustion-supporting air inlet system and the combustion-supporting air inlet system of the combustion-supporting gas and transmitting the pressure to the control system, and the control system controls the opening size of the corresponding flow regulating valve according to the pressure value.
Preferably, a flame state detector connected with the control system is arranged in the incinerator hearth, the flame state detector is used for detecting a flame state value of combustion in the incinerator hearth and transmitting the flame state value to the control system, and when the flame state value is lower than a set threshold value, the control system controls the flow regulating valves of the tail gas intake system and the combustion accompanying gas intake system to be closed.
Preferably, the incinerator is provided with a flue gas discharge system, the flue gas discharge system is provided with an oxygen content analyzer connected with the control system, the oxygen content analyzer is used for detecting the oxygen content in the discharged flue gas and transmitting the oxygen content to the control system, and when the oxygen content is lower than a set threshold value, the control system controls the flow regulating valves of the tail gas inlet system and the combustion accompanying gas inlet system to be closed.
The tail gas combustion treatment method and the tail gas combustion treatment system provided by the invention can adjust and input combustion-supporting air with corresponding flow when the content of CO in the tail gas is changed, can input a certain amount of combustion-supporting gas and combustion-supporting air with combustion-supporting gas with corresponding flow when the content of CO is lower and spontaneous combustion or sufficient combustion cannot be carried out, so that the tail gas can be sufficiently combusted, and can stop inputting the combustion-supporting gas and the combustion-supporting air with combustion-supporting gas when the content of CO is higher, so that the tail gas can be stably combusted, the combustion cost is reduced, the environmental pollution and energy waste caused by tail gas discharge are avoided, and the tail gas combustion treatment method and the tail gas combustion treatment system.
Drawings
Fig. 1 is a schematic structural diagram of a tail gas combustion processing system provided by the present invention.
Detailed description of the preferred embodiments
The invention provides a tail gas combustion treatment method, which adopts combustion equipment to combust tail gas, and comprises the following steps: the method comprises the steps of obtaining the content of CO in tail gas and the flow rate of the tail gas, calculating the flow rate of combustion-supporting air required by combustion of the tail gas, and when the content of CO in the tail gas is higher than a set threshold value, indicating that the tail gas can be independently combusted, and controlling to input only the tail gas and the combustion-supporting air with corresponding flow rate into combustion equipment for combustion; when the content of CO in the tail gas is lower than a set threshold value, the tail gas cannot maintain spontaneous combustion or is insufficiently combusted, gas is needed to be used for combustion accompanying, and the tail gas is prevented from being extinguished.
According to the content and the flow of the CO in the obtained tail gas, when the content and the flow of the CO in the tail gas are changed, the flow of combustion-supporting air required by combustion of the input tail gas can be adjusted, whether combustion-supporting gas is required to be input or not is judged according to the content of the CO in the tail gas, when the content of the CO is low and spontaneous combustion cannot be maintained and the combustion-supporting gas is required, the flow of the combustion-supporting gas required to be input and the flow of the combustion-supporting air required by the combustion-supporting gas are further adjusted, and when the content of the CO is high and spontaneous combustion can be maintained, the gas is withdrawn, so that the chloride process titanium white tail gas containing high-concentration CO.
The CO content can be detected by arranging a CO content analyzer on a tail gas inlet system of the combustion equipment, the tail gas flow can be detected by arranging a flowmeter on the tail gas inlet system of the combustion equipment, the flow of combustion-supporting air required by tail gas combustion is obtained by calculation, whether the CO content in the tail gas is higher than or lower than a set threshold value is judged, only tail gas and combustion-supporting air with corresponding flow are input into the combustion equipment under control, and the like, so that corresponding automatic control instruments can be configured to realize automatic operation, such as a single chip microcomputer, a PLC, an electronic flow regulating valve, an electronic transmission line and the like with a logic judgment function.
Preferably, the calculation of the flow rate of the combustion-supporting air required by the combustion of the tail gas is realized by the following steps: obtaining the flow and the CO content of tail gas input into the directional combustion equipment, calculating to obtain the flow of CO in the tail gas, further calculating to obtain the flow of combustion-supporting air required by tail gas combustion, and increasing a set margin coefficient according to the flow of the combustion-supporting air to ensure sufficient combustion so as to obtain the flow of the combustion-supporting air required by the final tail gas combustion. And similarly, in order to ensure sufficient combustion, the flow of the combustion-supporting air required by the combustion of the co-combustion gas is obtained by increasing a set margin coefficient according to the flow of the combustion-supporting air required by the combustion of the co-combustion gas.
Preferably, the tail gas treatment method further comprises the steps of obtaining the oxygen content in the flue gas generated after the tail gas is combusted so as to verify the combustion effect, and judging whether the flow of the provided combustion-supporting air is sufficient or not according to the obtained oxygen content in the flue gas, so that the allowance coefficient of the combustion-supporting air is adjusted; when the oxygen content in the flue gas is lower than a set threshold value, the combustion of the tail gas is abnormal, the combustion equipment is controlled to stop, and the tail gas and the co-combustion gas are stopped from being input into the combustion equipment, so that the safety linkage is realized.
Preferably, the tail gas treatment method further comprises the steps of obtaining a flame state value of combustion in the combustion equipment, when the flame state value is lower than a set threshold value, indicating that the tail gas is abnormal in combustion or unburnt, controlling to stop the combustion equipment, and stopping inputting the tail gas and the co-combustion gas into the combustion equipment to realize safety linkage.
Based on the above processing method, the invention also provides a tail gas combustion processing system, as shown in fig. 1, comprising a burner 3 and an incinerator 1, wherein the burner comprises a tail gas inlet chamber 31, a tail gas combustion-supporting air inlet chamber 32, a combustion-supporting gas inlet chamber 33 and a combustion-supporting gas inlet chamber 34 which are independent from each other, one end of each of the tail gas inlet chamber 31, the tail gas combustion-supporting air inlet chamber 32, the combustion-supporting gas inlet chamber 33 and the combustion-supporting gas inlet chamber 34 is respectively connected with the tail gas inlet system, the tail gas combustion-supporting air inlet system, the combustion-supporting gas inlet system and the combustion-supporting gas inlet system, the other end of each of the tail gas inlet chamber 31, the tail gas combustion-supporting air inlet chamber 32, the combustion-supporting gas inlet chamber 33 and the combustion-supporting gas inlet; because the tail gas inlet chamber 31, the tail gas combustion-supporting air inlet chamber 32, the combustion-supporting gas inlet chamber 33 and the combustion-supporting gas inlet chamber 34 are independent from each other, the tail gas combustion-supporting air, the combustion-supporting gas and the combustion-supporting gas can be independently input into the hearth of the incinerator, so that the tail gas combustion-supporting air, the combustion-supporting gas and the combustion-supporting gas are not influenced by each other, and the flow control is. And the tail gas inlet system, the tail gas combustion-supporting air inlet system, the combustion-supporting gas inlet system and the combustion-supporting gas inlet system are respectively provided with a flow meter and a flow regulating valve, and the tail gas inlet system is also provided with a CO content analyzer 18.
The tail gas combustion system also comprises a control system 100 connected with the ignition system, the flowmeter, the flow regulating valve and the CO content analyzer, wherein the control system is used for receiving the CO content in the tail gas detected by the CO content analyzer and the tail gas flow detected by the flowmeter, calculating to obtain the flow of combustion-supporting air required by tail gas combustion, and when the CO content is higher than a set threshold value, indicating that the tail gas can be independently combusted, controlling the corresponding flow regulating valve, respectively inputting the tail gas and the combustion-supporting air with the corresponding flow into the tail gas inlet chamber 31 and the tail gas combustion-supporting air inlet chamber 32, and combusting in the hearth of the incinerator 1; when the CO content is lower than the set threshold value, the tail gas cannot be independently combusted, the flow of the combustion accompanying gas required by the sufficient combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion accompanying gas are calculated, corresponding flow regulating valves are controlled, the combustion accompanying gas with the corresponding flow and the combustion-supporting air with the flow required by the combustion accompanying gas are respectively input into the combustion accompanying gas inlet chamber 33 and the combustion-supporting air inlet chamber 34, and the combustion-supporting air with the flow required by the combustion of the tail gas and the tail gas are combusted together in the hearth of the incinerator 1.
Through setting up control system, realized when CO content and flow change in tail gas, can automatically regulated input tail gas required combustion-supporting wind's flow to according to CO content in the tail gas, whether automatic judgement needs input accompany and burns the gas, when CO content is lower needs accompany and burns the gas, further automatically regulated input required accompany flow of burning the gas and accompany the flow of burning-supporting wind that burns the gas, make contain high concentration CO and unstable chlorination process titanium white tail gas of CO content safe and stable burning.
The control system 100 may employ a single chip microcomputer, a PLC, or the like having a logic determination function.
The flow of the combustion-supporting air required by the combustion of the tail gas is obtained through calculation by the following steps: the method comprises the steps of obtaining the flow and the CO content of tail gas input into a hearth of the incinerator through a flow meter and a CO content analyzer on a tail gas inlet system, calculating to obtain the flow of CO, further calculating to obtain the flow of combustion-supporting air required by tail gas combustion, and increasing a set allowance coefficient according to the flow of the combustion-supporting air to ensure sufficient combustion to obtain the flow of the combustion-supporting air required by the final tail gas combustion. And similarly, in order to ensure sufficient combustion, the flow of the combustion-supporting air required by the combustion of the co-combustion gas is obtained by increasing a set margin coefficient according to the flow of the combustion-supporting air required by the combustion of the co-combustion gas.
Preferably, the ignition system is located in the burning furnace hearth of the incinerator burning torch 4, and the ignition gas intake system 6 connected with the burning torch, there is ignition gas flow control valve 29 on the ignition gas intake system 6. Ignition control is conveniently carried out by arranging an independent ignition gas inlet system 6 and an ignition gas flow regulating valve 29.
The co-combustion gas and the ignition gas can adopt clean and safe natural gas.
Preferably, fire arresters are further arranged on the tail gas inlet system and the combustion accompanying gas inlet system, so that flames generated by combustion of the tail gas and the combustion accompanying gas can be prevented from invading the gas inlet system, and system safety is threatened.
Preferably, the tail gas intake system, the tail gas combustion-supporting air intake system and the combustion-supporting air intake system of the combustion-supporting accompanying gas are further provided with pressure transmitters connected with the control system 100, the pressure transmitters are used for detecting the pressures of the tail gas intake system, the tail gas combustion-supporting air intake system and the combustion-supporting air intake system of the combustion-supporting accompanying gas and transmitting the pressures to the control system, and the control system controls the opening size of the corresponding flow regulating valve according to the pressure value so as to maintain the pressure stability of the tail gas intake system, the tail gas combustion-supporting air intake system and the combustion-supporting air intake system of the combustion-supporting accompanying gas and can set the pressure of the tail gas intake system to be greater than a certain threshold value so.
Preferably, a flame state detector connected with the control system is arranged in the incinerator hearth, the flame state detector is used for detecting a flame state value of combustion in the incinerator hearth and transmitting the flame state value to the control system, and when the flame state value is lower than a set threshold value, the control system controls the flow regulating valves of the tail gas inlet system and the combustion accompanying gas inlet system to be closed, so that safety linkage is realized. The flame state detector can adopt an ultraviolet fire detection probe, and the ultraviolet fire detection probes can be arranged in a plurality in order to prevent the single fire detection probe from being failed or misreported.
Preferably, the incinerator is provided with a flue gas discharge system, the flue gas discharge system is provided with an oxygen content analyzer connected with the control system, the oxygen content analyzer is used for detecting the oxygen content in the discharged flue gas to detect whether the combustion is sufficient or not, the oxygen content is transmitted to the control system, when the oxygen content is lower than a set threshold value, the tail gas combustion is abnormal, and the control system controls the flow regulating valves of the tail gas inlet system and the combustion-accompanying gas inlet system to be closed, so that the safety linkage is realized. In addition, according to the oxygen content, in order to ensure sufficient combustion, the allowance coefficient of combustion-supporting air can be properly adjusted. The flue gas temperature generated after the tail gas is combusted is higher, and the oxygen content analyzer can be arranged on a low-temperature flue gas pipeline after heat exchange of the boiler.
It should be noted that the tail gas treatment method and the tail gas treatment system provided by the invention can treat not only the chlorination process titanium dioxide tail gas, but also other tail gases with high and unstable CO content.
The method and system for combustion treatment of tail gas provided by the present invention will be better described with reference to a preferred embodiment.
The invention provides a tail gas combustion processing system, as shown in figure 1, comprising a burner 3, an incinerator 1 and a boiler 2, wherein the burner 3 comprises a tail gas inlet chamber 31, a tail gas combustion-supporting air inlet chamber 32, a combustion-supporting gas inlet chamber 33 and a combustion-supporting gas inlet chamber 34 which are mutually independent, as shown in figure 1, the tail gas inlet chamber 31, the tail gas combustion-supporting air inlet chamber 32, the combustion-supporting gas inlet chamber 33 and the combustion-supporting gas inlet chamber 34 can be arranged to be mutually sleeved, or arranged in parallel, or in other modes, as long as each space can independently input tail gas, combustion-supporting gas and combustion-supporting air; one end of the tail gas inlet chamber 31, the tail gas combustion-supporting air inlet chamber 32, the combustion-supporting gas inlet chamber 33 and the combustion-supporting gas inlet chamber 34 is respectively connected with the tail gas inlet pipeline 19, the tail gas combustion-supporting air inlet pipeline 13, the combustion-supporting gas inlet pipeline 28 and the combustion-supporting gas inlet pipeline 23, the other end of the tail gas inlet chamber is positioned in the hearth of the incinerator 1, an ignition gun 4 is arranged in the hearth of the incinerator 1, the ignition gun 4 is connected with an ignition gas pipeline 6, and an ignition gas flow regulating valve 29 is arranged on the ignition gas pipeline 6. A tail gas inlet pipeline 19 through which tail gas flows is sequentially provided with a CO content analyzer 18, a tail gas pressure transmitter 17, a tail gas flowmeter 16, a tail gas flow regulating valve 15 and a tail gas flame arrester 14, a tail gas combustion-supporting air pressure transmitter 12, a tail gas combustion-supporting air flowmeter 11 and a tail gas combustion-supporting air flow regulating valve 10 are sequentially arranged on a tail gas combustion-supporting air inlet pipeline 13 through which tail gas combustion-supporting air flows, a combustion-supporting gas flowmeter 7, a combustion-supporting gas flow regulating valve 8 and a combustion-supporting gas flame arrester 9 are sequentially arranged on a combustion-supporting gas inlet pipeline 28 through which combustion-supporting gas flows, and a combustion-supporting gas pressure transmitter 22, a combustion-supporting gas flowmeter 21 and a combustion-supporting gas flow regulating valve 20 are sequentially arranged on a combustion-supporting gas inlet pipeline 23 through which combustion-supporting gas flows.
The tail gas combustion-supporting air inlet pipeline 13 and the co-combustion gas combustion-supporting air inlet pipeline 23 are also connected with a fan 24.
Two ultraviolet fire detection probes 5 are also arranged in the hearth of the incinerator 1. The incinerator is also provided with a high-temperature flue gas discharge pipeline 26 connected with the boiler 2, the boiler 2 is also connected with a low-temperature flue gas discharge pipeline 27, high-temperature fuel gas generated by combustion of the incinerator 1 is discharged through the low-temperature flue gas discharge pipeline 27 after heat exchange of the boiler 2, and the low-temperature flue gas discharge pipeline 27 is provided with an oxygen content analyzer 25.
The tail gas combustion processing system also comprises a control system 100, wherein the control system 100 is electrically connected with the ignition gun 4, the ignition gas flow regulating valve 29, the CO content analyzer 18, the tail gas pressure transmitter 17, the tail gas flowmeter 16, the tail gas flow regulating valve 15, the tail gas combustion-supporting air pressure transmitter 12, the tail gas combustion-supporting air flowmeter 11, the tail gas combustion-supporting air flow regulating valve 10, the combustion-supporting gas flowmeter 7, the combustion-supporting gas flow regulating valve 8, the combustion-supporting gas pressure transmitter 22, the combustion-supporting gas flowmeter 21, the combustion-supporting gas flow regulating valve 20 and the fan 24.
When the system is used, the method specifically comprises the following steps:
1. a preparation stage: the control system controls the starting fan 24, opens the tail gas combustion-supporting air flow regulating valve 10 and the combustion-supporting air flow regulating valve 20 for combustion-supporting with combustion-accompanying gas, sweeps the hearth of the incinerator for 10min, and closes the tail gas combustion-supporting air flow regulating valve 10 and the combustion-supporting air flow regulating valve 20 for combustion-supporting with combustion-accompanying gas after sweeping.
2. And (3) ignition: the control system controls to open the ignition gas flow regulating valve 29, ignition gas is input into the hearth of the incinerator through the ignition pipeline 6 and the ignition gun 4 is started to ignite, after small fire is ignited, the ultraviolet fire detection probe 5 detects flame and controls the ignition gas flow regulating valve to be closed, and the ignition step is finished.
3. Putting the co-combustion gas into a big fire: setting the combustion-accompanying gas flow rate to 100Nm3And h, controlling the combustion-supporting gas flow regulating valve 8 not to be disconnected greatly, controlling the flow detected by the combustion-supporting gas flowmeter 7 to be increased continuously, simultaneously calculating the real-time value (increase allowance coefficient) of the combustion-supporting air volume of the required combustion-supporting gas by the control system, and controlling the combustion-supporting gas flow regulating valve 20 not to be disconnected greatly until the combustion-supporting gas flowmeter 21 detects the combustion-supporting air volume of the combustion-supporting gasThe flow of the combustion supporting air reaches the required value. And when the flow of the co-combustion gas and the flow of the co-combustion gas combustion-supporting air are stable, finishing the step of big fire ignition. Checking whether the oxygen content of the flue gas generated by combustion detected by the oxygen content analyzer 25 meets the requirement (such as>5 percent), if the requirement is met, indicating that the combustion of the co-combustion gas is normal.
4. And (3) tail gas ignition: setting a tail gas pipeline pressure control value (such as 2.5KPa), when the tail gas pipeline pressure detected by a tail gas pressure transmitter 17 reaches a set value, starting to be not disconnected greatly by a tail gas flow regulating valve 15, detecting in real time by a tail gas flowmeter 16 to obtain tail gas flow, detecting in real time by a CO content analyzer 18 to obtain the CO content in tail gas, calculating the required combustion-supporting air volume (increasing a margin coefficient) by the system according to the tail gas flow and the carbon monoxide content in the tail gas, and controlling the tail gas combustion-supporting air flow regulating valve 10 not to be disconnected greatly to reach the air volume required by the system. And when the flow of the tail gas and the flow of the tail gas combustion-supporting air are stable, the tail gas ignition step is completed.
5. Tail gas combustion: setting an upper limit and a lower limit of CO content in tail gas (if the lower limit is 40 percent and the upper limit is 45 percent), judging whether the CO-combustion gas needs to be added in a linkage manner according to the obtained CO content value, if the carbon monoxide content in the obtained tail gas is higher than 45 percent, automatically controlling the CO-combustion gas flow regulating valve 8 and the CO-combustion gas combustion-supporting air flow regulating valve 20 to be closed by the control system, only normally burning the tail gas in the hearth of the incinerator, if the carbon monoxide content in the obtained tail gas is lower than 40 percent, automatically controlling the CO-combustion gas flow regulating valve 8 to be opened by the control system, and re-allocating the CO-combustion gas combustion-supporting air with corresponding flow, and burning the CO-combustion gas and the tail gas in.
6. If the two ultraviolet fire detection probes 5 can not detect flames or the oxygen content in the smoke detected by the oxygen content analyzer 25 is lower than a set value (2%), the combustor 3 is triggered to stop, and in addition, the combustion-supporting air allowance coefficient can be properly adjusted according to the oxygen content value.
7. After the combustor 3 is stopped and triggered, the control system automatically cuts off the tail gas flow regulating valve 15 and the combustion accompanying gas flow regulating valve 8, the tail gas is switched to a torch to be discharged, and the tail gas combustion-supporting air pipeline 13 and the combustion accompanying gas combustion-supporting air pipeline 23 still keep the original state to continuously sweep the hearth.
Therefore, the combustor of the embodiment can enable the tail gas, the tail gas combustion-supporting air, the co-combustion gas and the co-combustion gas combustion-supporting air to independently enter the incinerator through independent layering, and the tail gas combustion-supporting air, the co-combustion gas and the co-combustion gas combustion-supporting air are not affected by each other. And through setting up control system and various detectors, flow control valve etc. when the gas composition (CO content) changes in the tail gas, can automatic adjustment input corresponding flowrate accompany burning gas and combustion-supporting wind, realize the safe and stable burning of tail gas. And a safety interlocking device such as an oxygen content analyzer and an ultraviolet fire detection probe is matched as a last defense line, so that the safe and stable combustion of tail gas is further realized.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A tail gas combustion treatment method is characterized in that combustion equipment is adopted to combust tail gas, and the treatment method comprises the following steps: acquiring the content of CO in the tail gas and the flow of the tail gas, calculating to obtain the flow of combustion-supporting air required by the combustion of the tail gas, and controlling to input only the tail gas and the combustion-supporting air with corresponding flow into the combustion equipment for combustion when the content of CO in the tail gas is higher than a set threshold value; and when the content of CO in the tail gas is lower than a set threshold value, calculating to obtain the flow of the combustion accompanying gas required by the combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion accompanying gas, and controlling the combustion accompanying gas with the required flow, the combustion-supporting air with the flow required by the combustion of the combustion accompanying gas, the tail gas and the combustion-supporting air with the flow required by the combustion of the tail gas to be input into the combustion equipment for CO-combustion.
2. The method of claim 1, wherein the tail gas is burned,
the flow of the combustion-supporting air required by the combustion of the tail gas is obtained through calculation according to the following steps: and obtaining the flow of the tail gas input into the combustion equipment and the content of CO in the tail gas, calculating to obtain the flow of the CO input into the combustion equipment, further calculating to obtain the flow of combustion-supporting air required by the combustion of the tail gas, and increasing a set margin coefficient according to the flow of the combustion-supporting air to obtain the final flow of the combustion-supporting air required by the combustion of the tail gas.
3. The method of claim 2, wherein the tail gas is burned,
the flow of the combustion-supporting air required by the combustion of the combustion-supporting gas is obtained by increasing a set allowance coefficient according to the flow of the combustion-supporting air required by the combustion of the combustion-supporting gas.
4. The exhaust gas combustion treatment method according to claim 2 or 3,
the method further comprises the steps of obtaining the oxygen content in the flue gas generated after the tail gas is combusted, and adjusting the allowance coefficient of the combustion-supporting air according to the obtained oxygen content in the flue gas; and when the oxygen content in the flue gas is lower than a set threshold value, controlling to stop inputting the tail gas and the co-combustion gas into the combustion equipment.
5. The method of claim 1, wherein the tail gas is burned,
the method further comprises the step of obtaining a flame state value of combustion in the combustion equipment, and controlling to stop inputting the tail gas and the combustion accompanying gas into the combustion equipment when the flame state value is lower than a set threshold value.
6. A tail gas combustion processing system is characterized in that,
the tail gas combustion-supporting air inlet chamber, the combustion-supporting gas inlet chamber and the combustion-supporting gas inlet chamber are mutually independent, one end of each of the tail gas inlet chamber, the tail gas combustion-supporting air inlet chamber, the combustion-supporting gas inlet chamber and the combustion-supporting gas inlet chamber is respectively connected with a tail gas inlet system, a tail gas combustion-supporting air inlet system, a combustion-supporting gas inlet system and a combustion-supporting gas inlet system, the other end of each of the tail gas inlet chamber, the tail gas combustion-supporting air inlet chamber, the combustion-supporting gas inlet chamber and the combustion-supporting gas inlet chamber is positioned in a hearth of the incinerator, and; the tail gas inlet system, the tail gas combustion-supporting air inlet system, the combustion accompanying gas inlet system and the combustion accompanying gas combustion-supporting air inlet system are all provided with a flow meter and a flow regulating valve, and the tail gas inlet system is also provided with a CO content analyzer;
the control system is used for receiving the CO content in the tail gas detected by the CO content analyzer and the tail gas flow detected by the flowmeter, calculating to obtain the flow of combustion-supporting air required by combustion of the tail gas, and controlling the flow regulating valve to input the tail gas and the combustion-supporting air with corresponding flow to the tail gas inlet chamber and the tail gas combustion-supporting air inlet chamber respectively and burn in the hearth of the incinerator when the CO content is higher than a set threshold value; when the CO content is lower than a set threshold value, calculating to obtain the flow of the combustion-supporting gas required by the combustion of the tail gas and the flow of the combustion-supporting air required by the combustion of the combustion-supporting gas, controlling the flow regulating valve, inputting the combustion-supporting gas with the corresponding flow and the combustion-supporting air with the flow required by the combustion of the combustion-supporting gas into the combustion-supporting gas inlet chamber and the combustion-supporting air inlet chamber respectively, and carrying out CO-combustion with the combustion-supporting air with the flow required by the combustion of the tail gas and the tail gas in the hearth of the incinerator.
7. The exhaust gas combustion treatment system of claim 6, wherein flame arresters are further provided on the exhaust gas intake system and the combustion accompanying gas intake system.
8. The exhaust gas combustion treatment system of claim 6,
the tail gas air inlet system, the tail gas combustion-supporting air inlet system and the combustion-supporting air inlet system of the combustion-supporting gas of accompanying combustion are also provided with a pressure transmitter connected with the control system, the pressure transmitter is used for detecting the pressure of the tail gas air inlet system, the tail gas combustion-supporting air inlet system and the combustion-supporting air inlet system of accompanying combustion-supporting gas and transmitting the pressure to the control system, and the control system controls the opening size of the corresponding flow regulating valve according to the pressure value.
9. The exhaust gas combustion treatment system of claim 6,
and a flame state detector connected with the control system is arranged in the incinerator hearth and used for detecting a flame state value of combustion in the incinerator hearth and transmitting the flame state value to the control system, and when the flame state value is lower than a set threshold value, the control system controls the flow regulating valves of the tail gas inlet system and the combustion accompanying gas inlet system to be closed.
10. The exhaust gas combustion treatment system of claim 6,
the incinerator is provided with a flue gas discharge system, an oxygen content analyzer connected with the control system is arranged on the flue gas discharge system, the oxygen content analyzer is used for detecting the oxygen content in the discharged flue gas and transmitting the oxygen content to the control system, and when the oxygen content is lower than a set threshold value, the control system controls the flow regulating valves of the tail gas inlet system and the combustion accompanying gas inlet system to be closed.
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Application publication date: 20200417 |