CN111023123B - Method for improving organic waste gas treatment efficiency by adopting four-bed RTO and four-bed RTO - Google Patents
Method for improving organic waste gas treatment efficiency by adopting four-bed RTO and four-bed RTO Download PDFInfo
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- CN111023123B CN111023123B CN201911345214.1A CN201911345214A CN111023123B CN 111023123 B CN111023123 B CN 111023123B CN 201911345214 A CN201911345214 A CN 201911345214A CN 111023123 B CN111023123 B CN 111023123B
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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
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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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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Abstract
The invention discloses a method for improving organic waste gas treatment efficiency by adopting a four-bed RTO (regenerative thermal oxidizer) and the four-bed RTO, belonging to the technical field of organic waste gas purification treatment. According to the invention, only one regenerator is needed to be added on the basis of the original three-bed RTO, the overall treatment and purification efficiency is higher after the four-bed type regenerator is adopted, secondary pollution caused by ammonium salt solid waste, ammonia nitrogen-containing wastewater and the like is avoided, and the blockage of various ammonium chloride, ammonium sulfite, ammonium sulfate, triethylamine hydrochloride and other substances on the heat storage ceramic body can be effectively prevented, so that the stability and the safety of the ammonia, amine, chlorine and sulfur-containing waste gas treatment system are further improved. The four-bed RTO regenerator adopts a method of firstly back blowing cleaning and then waste gas combustion, the bottom temperature of the regenerator is effectively reduced, the heat loss is less, the thermal efficiency is higher, and an RTO system is more energy-saving.
Description
Technical Field
The invention belongs to the technical field of organic waste gas purification treatment, and particularly relates to a method for improving organic waste gas treatment efficiency by adopting a four-bed RTO (regenerative thermal oxidizer) and the four-bed RTO.
Background
A Regenerative Thermal Oxidizer (RTO) is high-efficiency organic waste gas treatment equipment, and the working principle of the RTO is that organic waste gas is heated to 760-850 ℃, and Volatile Organic Compounds (VOCs) in the waste gas are oxidized and decomposed into carbon dioxide and water.
The heat generated in the oxidation process is stored in a special ceramic heat accumulator, so that the heat accumulator is heated to store heat. The heat stored in the ceramic heat accumulator is used for preheating the subsequent entering organic waste gas, and the process is a heat release process of the ceramic heat accumulator, so that the fuel consumption in the waste gas heating process is saved. Two-bed and three-bed RTO are widely adopted in the sixty-seven years of the 20 th century in China, RTO is used for treating organic waste gas in succession in the beginning of the 21 st century in China, and three-bed, five-bed and seven-bed RTO furnaces are taken as mainstream technologies in the fine chemical industry at present, so that the application technology of RTO is mature. However, the composition of waste gas pollutants in the fine chemical industry is very complex, the components are numerous, and in addition, the research on the generation mechanism of the RTO salification problem is insufficient in the early stage, various measures such as shutdown manual cleaning, high-temperature back flushing, bottom water spraying and the like are concentrated in the end treatment link, and the subsequent treatment cost is greatly increased by the treated ammonia and nitrogen-containing waste water and hazardous waste, so that the salt-containing crystallization problem of the RTO furnace seriously hinders the application of the RTO furnace in the fine chemical industry such as medicines, pesticides and dyes.
The most widely used at present is the three-bed RTO, which has the following working principle:
stage one: waste gas is preheated through the regenerator A and then enters the combustion chamber for combustion, gas left in the regenerator C after being purified and untreated is blown back to the combustion chamber for incineration treatment (blowing function) is discharged through the regenerator B, and meanwhile, the regenerator B is heated.
And a second stage: waste gas is preheated through the heat accumulation bed B and then enters the combustion chamber for combustion, gas left in the heat accumulation chamber A after being purified is blown back to the combustion chamber for incineration treatment and then is discharged through the heat accumulation chamber C, and meanwhile, the heat accumulation chamber C is heated.
And a third stage: waste gas is preheated through regenerator C, then gets into the combustion chamber burning, remains waste gas in regenerator B and is returned the combustion chamber by the air blowback and carry out incineration disposal back waste gas and discharge through regenerator A, and regenerator A is heated simultaneously.
If the discharged waste gas contains inorganic ammonia or organic amine, sulfur or chlorine, bromine and other elements, the first stage A is back-blown by the back-blowing from the inlet B to the outlet C, the second stage B is back-blown by the back-blowing from the inlet C to the outlet A, and because the burning temperature of the RTO furnace is about 800 ℃, the sulfur, bromine and chlorine substances are mainly generated after burning SO2HBr, HCl, etc., SO SO is discharged through the B regenerator in the first stage2Acidic pollutants such as HBr, HCl and the like are generated by the reaction of the acidic pollutants and the ammonia-containing waste gas newly entering in the second stage in the lower temperature area at the bottom of the regenerator to generate ammonium chloride, ammonium sulfite, ammonium sulfate, triethylamine hydrochloride and the likeSolid particles, thereby clogging the heat-accumulating ceramic body, cause the following hazards:
(1) the heat storage ceramic body is blocked, so that the heat exchange efficiency of the equipment is reduced, the temperature of a flue gas outlet is increased, and the operation energy consumption is greatly increased.
(2) The heat storage ceramic body is blocked, so that the resistance of equipment is greatly increased, the actual treatment gas amount of waste gas is reduced, and even the treatment capacity is completely lost.
(3) Part of secondary pollutants such as triethylamine hydrochloride have flammable characteristics, and are easy to spontaneously combust when the temperature of outlet flue gas is higher, so that safety accidents such as fire, explosion and the like are caused.
Disclosure of Invention
The invention aims to provide a method for improving the treatment efficiency of organic waste gas by adopting a four-bed RTO (regenerative thermal oxidizer), and solves the problems of secondary pollutants and furnace body blockage generated in the process of treating organic waste gas containing inorganic ammonia or organic amine, sulfur, chlorine, bromine and other elements by adopting the conventional RTO incineration method. The invention aims to solve another technical problem of providing a four-bed RTO for improving the organic waste gas treatment efficiency, which can effectively prevent a furnace body from being blocked and can greatly reduce secondary pollutants such as hydrogen chloride, dioxin and the like generated in the incineration process.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method for improving organic waste gas treatment efficiency by adopting four-bed RTO comprises the following steps:
(1) a first circulation stage: an air inlet valve of the regenerator A, an air outlet valve of the regenerator B, a back-flushing valve of the regenerator C and a back-flushing valve of the regenerator D are opened, other valves are kept closed, organic waste gas enters the oxidation chamber for combustion after being preheated by the regenerator A and then is discharged by the air outlet valve of the regenerator B, meanwhile, air is back-flushed by a purging fan through the back-flushing valve of the regenerator C and the back-flushing valve of the regenerator D and enters the regenerator C and the regenerator D, and the combusted waste gas is discharged to an air outlet header pipe through the air outlet valve of the regenerator B; and (3) entering a second circulation stage of the step (2) after the set time:
(2) and a second circulation stage: the reverse blowing valve of the heat storage chamber C and the reverse blowing valve of the heat storage chamber D are sequentially closed, the air outlet valve of the heat storage chamber D and the air inlet valve of the heat storage chamber C are sequentially opened, the air inlet valve of the heat storage chamber A and the air outlet valve of the heat storage chamber B are sequentially closed, the reverse blowing valve of the heat storage chamber A and the reverse blowing valve of the heat storage chamber B are sequentially opened, other valves are kept closed, organic waste gas enters the oxidation chamber for combustion after being preheated by the heat storage chamber C and then is discharged by the air outlet valve of the heat storage chamber D, meanwhile, the air is reversely blown into the heat storage chamber A and the heat storage chamber B by the blow fan through the reverse blowing valve of the heat storage chamber A and the reverse blowing valve of the; entering a third circulation stage of the step (3) after the set time;
(3) a third circulation stage: the reverse blowing valve of the regenerator A and the reverse blowing valve of the regenerator B are sequentially closed, the air outlet valve of the regenerator A and the air inlet valve of the regenerator B are sequentially opened, the air inlet valve of the regenerator C and the air outlet valve of the regenerator D are sequentially closed, the reverse blowing valve of the regenerator C and the reverse blowing valve of the regenerator D are sequentially opened, other valves are kept closed, organic waste gas enters the oxidation chamber through the regenerator B for combustion and then is discharged through the air outlet valve of the regenerator A, meanwhile, the air is reversely blown into the regenerator C and the regenerator D through the reverse blowing valve of the regenerator C and the reverse blowing valve of the regenerator D by the blowing fan, and the combusted waste gas is discharged to the air outlet header pipe through the air outlet valve of the regenerator A; entering a cycle stage four of the step (4) after the set time;
(4) and a fourth circulation stage: the reverse blowing valve of the heat storage chamber C and the reverse blowing valve of the heat storage chamber D are sequentially closed, the air outlet valve of the heat storage chamber C and the air inlet valve of the heat storage chamber D are sequentially opened, the air inlet valve of the heat storage chamber B and the air outlet valve of the heat storage chamber A are sequentially closed, the reverse blowing valve of the heat storage chamber A and the reverse blowing valve of the heat storage chamber B are sequentially opened, other valves are kept closed, organic waste gas is preheated by the heat storage chamber D, enters the oxidation chamber for combustion and is discharged by the air outlet valve of the heat storage chamber C, meanwhile, the air is reversely blown by the blowing fan through the reverse blowing valve of the heat storage chamber A and the reverse blowing valve of the heat storage chamber B, enters the heat storage chamber A and; and (5) returning to the step (1) again after the set time, and starting the next cycle.
According to the method for improving the organic waste gas treatment efficiency by adopting the four-bed RTO, the set time is the time required by complete combustion of waste gas and is calculated according to the real-time temperature of the oxidation chamber.
A four-bed RTO for improving the treatment efficiency of organic waste gas comprises a regenerator A, a regenerator B, a regenerator C, a regenerator D, an oxidation chamber, an air inlet header pipe, a cleaning header pipe and an air outlet header pipe; the heat storage chambers A, B, C and D are arranged in series, and the tops of the four heat storage chambers are communicated with the oxidation chamber; the structures of the heat storage chamber A, the heat storage chamber B, the heat storage chamber C and the heat storage chamber D are the same, and heat storage bodies are filled in the four heat storage chambers;
a regenerator A air inlet pipeline and a regenerator A purging pipeline are arranged on one side of the regenerator A, a regenerator A air outlet pipeline is arranged on the other side of the regenerator A, a regenerator A air inlet valve 1 is arranged on the regenerator A air inlet pipeline, a regenerator A blowback valve is arranged on the regenerator A purging pipeline, and a regenerator A air outlet valve is arranged on the regenerator A air outlet pipeline; the air inlet pipeline of the regenerator A is connected with an air inlet header pipe; the purging pipeline of the regenerator A is connected with the purging header pipe; the air outlet pipeline of the regenerator A is connected with an air outlet header pipe;
and the connection structures between the regenerator B, the regenerator C and the regenerator D and the air inlet header pipe, the cleaning header pipe and the air outlet header pipe are the same as the connection structures between the regenerator A and the air inlet header pipe, the cleaning header pipe and the air outlet header pipe.
The sections of the regenerator A, the regenerator B, the regenerator C and the regenerator D are square or circular.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that the heat accumulator is made of a ceramic material, the bottommost layer is random packing, the middle layer is regular packing, and the topmost layer is random packing.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that the random packing is a ceramic saddle ring.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that an auxiliary burner is arranged in the oxidation chamber and can be used for burning by using oil or natural gas as fuel. The auxiliary burner is used to initially heat the regenerator to a certain temperature or when the concentration of combustible in the exhaust gas is low, supplementary fuel is required to maintain the reaction temperature required in the combustion chamber.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that refractory bricks and ceramic fibers are arranged in the regenerator A, the regenerator B, the regenerator C, the regenerator D and the oxidation chamber and used for heat preservation.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that the regenerator A, the regenerator B, the regenerator C, the regenerator D and the oxidation chamber are provided with inspection doors, so that the maintenance is convenient.
The four-bed RTO for improving the organic waste gas treatment efficiency is characterized in that a main fan is arranged at the air inlet of the air inlet main pipe, and a cleaning fan is arranged at the air inlet of the cleaning pipeline.
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) the invention only needs to add a regenerator on the basis of the original three-bed RTO, the total treatment and purification efficiency of the four-bed type regenerator is more than 99 percent, secondary pollution of ammonium salt solid waste, ammonia nitrogen-containing wastewater and the like is not generated, and the blockage of various ammonium chloride, (ammonium sulfite), triethylamine hydrochloride and other substances on the heat storage ceramic body can be effectively prevented, thereby further improving the stability and the safety of the ammonia (amine) -containing, chlorine-containing and sulfur-containing waste gas treatment system.
(2) The RTO regenerator adopts a method of firstly back blowing cleaning and then waste gas burning, the bottom temperature of the regenerator is effectively reduced, the heat loss is less, the thermal efficiency of the system is higher, and the RTO system is more energy-saving.
Drawings
FIG. 1 is a process flow diagram of a four-bed RTO apparatus for improving the efficiency of organic waste gas treatment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
Example 1
A four-bed RTO for improving the treatment efficiency of organic waste gas is shown in figure 1 and comprises a regenerator A13, a regenerator B14, a regenerator C15, a regenerator D16, an oxidation chamber 22, an air inlet manifold 17, a scavenging manifold 18 and an air outlet manifold 19; the regenerator A13, the regenerator B14, the regenerator C15 and the regenerator D16 are arranged in series, and the tops of the four regenerators are communicated with the oxidation chamber 22; the sections of the regenerator A13, the regenerator B14, the regenerator C15 and the regenerator D16 are circular, and regenerators are filled in the four regenerators; the heat accumulator is made of ceramic material, the bottommost layer is a random packing ceramic rectangular saddle ring, the middle layer is regular packing, and the topmost layer is random packing. The oxidation chamber 22 is provided with an auxiliary burner which can be fired with oil or natural gas as fuel. The auxiliary burner is used to initially heat the regenerator to a certain temperature or when the concentration of combustible in the exhaust gas is low, supplementary fuel is required to maintain the reaction temperature required in the combustion chamber. Refractory bricks and ceramic fibers are arranged in the heat storage chamber A, the heat storage chamber B, the heat storage chamber C, the heat storage chamber D and the oxidation chamber and are used for heat preservation; one side is provided with an inspection door for convenient maintenance.
A regenerator A air inlet pipeline and a regenerator A purging pipeline are arranged on one side of the regenerator A13, a regenerator A air outlet pipeline is arranged on the other side of the regenerator A, a regenerator A air inlet valve 1 is arranged on the regenerator A air inlet pipeline, a regenerator A blowback valve 9 is arranged on the regenerator A purging pipeline, and a regenerator A air outlet valve 2 is arranged on the regenerator A air outlet pipeline; a regenerator B air inlet pipeline and a regenerator B purging pipeline are arranged on one side of the regenerator B14, a regenerator B air outlet pipeline is arranged on the other side of the regenerator B, a regenerator B air inlet valve 3 is arranged on the regenerator B air inlet pipeline, a regenerator B blowback valve 10 is arranged on the regenerator B purging pipeline, and a regenerator B air outlet valve 4 is arranged on the regenerator B air outlet pipeline; a regenerator C air inlet pipeline and a regenerator C purging pipeline are arranged on one side of the regenerator C15, a regenerator C air outlet pipeline is arranged on the other side of the regenerator C, a regenerator C air inlet valve 5 is arranged on the regenerator C air inlet pipeline, a regenerator C blowback valve 11 is arranged on the regenerator C purging pipeline, and a regenerator C air outlet valve 6 is arranged on the regenerator C air outlet pipeline; a regenerator D air inlet pipeline and a regenerator D purging pipeline are arranged on one side of the regenerator D16, a regenerator D air outlet pipeline is arranged on the other side of the regenerator D, a regenerator D air inlet valve 7 is arranged on the regenerator D air inlet pipeline, a regenerator D blowback valve 12 is arranged on the regenerator D purging pipeline, and a regenerator D air outlet valve 8 is arranged on the regenerator D air outlet pipeline; the heat storage ceramic body supporting piece and the switching valve of the four-bed RTO adopt 2205 duplex stainless steel, Hastelloy and other metal materials so as to reduce equipment corrosion. The air inlet of the air inlet main pipe is provided with a main fan, and the air inlet of the cleaning pipeline is provided with a cleaning fan.
An air inlet pipeline of the regenerator A, an air inlet pipeline of the regenerator B, an air inlet pipeline of the regenerator C and an air inlet pipeline of the regenerator D are connected with an air inlet header pipe 17; the regenerator A purging pipeline, the regenerator B purging pipeline, the regenerator C purging pipeline and the regenerator D purging pipeline are connected with the purging header pipe 18; the air outlet pipeline of the heat storage chamber A, the air outlet pipeline of the heat storage chamber B, the air outlet pipeline of the heat storage chamber C and the air outlet pipeline of the heat storage chamber D are connected with an air outlet header pipe 19.
The device has no metal exposed in the high-temperature area, and the switching valve, the flashboard and the like which are contacted with high-temperature gas have heat insulation measures. The refractory-based material has a high heat storage capacity, and thus enables the combustion chamber to maintain a uniform temperature distribution even when there is fluctuation in the composition of exhaust gas or the calorific value of combustible.
A method for improving organic waste gas treatment efficiency by adopting four-bed RTO comprises the following steps:
(1) a first circulation stage: an air inlet valve 1 of a regenerator A, an air outlet valve 4 of a regenerator B, a back-flushing valve 11 of the regenerator C and a back-flushing valve 12 of the regenerator D are opened, other valves are kept closed, organic waste gas enters an oxidation chamber 22 for combustion after being preheated by the air inlet valve 1 of the regenerator A from a main fan 20 and then is discharged by the air outlet valve 4 of the regenerator B, meanwhile, air is back-flushed by a purging fan through the back-flushing valve 11 of the regenerator C and the back-flushing valve 12 of the regenerator D and then enters the regenerator C15 and the regenerator D16, and the combusted waste gas is discharged to an air outlet header pipe 19 through the air outlet valve 4 of the regenerator B; entering a second circulation stage of the step (2) after the set time;
(2) and a second circulation stage: the reverse blowing valve 11 of the regenerator C and the reverse blowing valve 12 of the regenerator D are sequentially closed, the air outlet valve 8 of the regenerator D and the air inlet valve 5 of the regenerator C are sequentially opened, the air inlet valve 1 of the regenerator A and the air outlet valve 4 of the regenerator B are sequentially closed, the reverse blowing valve 9 of the regenerator A and the reverse blowing valve 10 of the regenerator B are sequentially opened, other valves are kept closed, organic waste gas enters the regenerator C15 from the main fan 20 through the air inlet valve 5 of the regenerator C for preheating and then enters the oxidation chamber 22 for combustion, then is discharged through the air outlet valve 8 of the regenerator D, meanwhile, the cleaning fan 21 reversely blows air into the regenerator A13 and the regenerator B14 through the reverse blowing valve 9 of the regenerator A and the reverse blowing valve 10 of the regenerator B, and the combusted waste gas is discharged to the air outlet header pipe 19 through the air outlet valve 8 of the; and (3) entering a third cycle stage of the step (3) after the set time is reached:
(3) a third circulation stage: the reverse blowing valve 9 of the heat storage chamber A and the reverse blowing valve 10 of the heat storage chamber B are sequentially closed, the air outlet valve 2 of the heat storage chamber A and the air inlet valve 3 of the heat storage chamber B are sequentially opened, the air inlet valve 5 of the heat storage chamber C and the air outlet valve 8 of the heat storage chamber D are sequentially closed, the reverse blowing valve 11 of the heat storage chamber C and the reverse blowing valve 12 of the heat storage chamber D are sequentially opened, other valves are kept closed, organic waste gas enters the heat storage chamber B14 from the main fan 20 through the air inlet valve 3 of the heat storage chamber B to enter the oxidation chamber 22 for combustion, then is discharged through the air outlet valve 2 of the heat storage chamber A, meanwhile, the air is reversely blown into the heat storage chamber C15 and the heat storage chamber D16 through the reverse blowing valve 11 of the heat storage chamber C and the reverse blowing valve 12 of the; and (4) entering a cycle stage four of the step (4) after the set time:
(4) and a fourth circulation stage: the reverse blowing valve 11 of the regenerator C and the reverse blowing valve 12 of the regenerator D are sequentially closed, the outlet valve 6 of the regenerator C and the inlet valve 7 of the regenerator D are sequentially opened, the inlet valve 3 of the regenerator B and the outlet valve 2 of the regenerator A are sequentially closed, the reverse blowing valve 9 of the regenerator A and the reverse blowing valve 10 of the regenerator B are sequentially opened, other valves are kept closed, organic waste gas enters the regenerator D16 from the main fan 20 through the inlet valve 7 of the regenerator D and enters the oxidation chamber 22 for combustion, then is discharged through the outlet valve 6 of the regenerator C, meanwhile, the cleaning fan 21 reversely blows air into the regenerator A and the regenerator B through the reverse blowing valve 9 of the regenerator A and the reverse blowing valve 10 of the regenerator B, and the combusted waste gas is discharged to the gas outlet header pipe 19 through the outlet valve 6 of the regenerator C; and (5) returning to the step (1) after the set time, and starting a new cycle.
In the above process, the P L C program will set the time of each cycle in advance, and will automatically move to the next stage after reaching the time, which is the time required for the complete combustion of the exhaust gas calculated by the system according to the real-time temperature monitored by the temperature of the oxidation chamber.
The process is repeated in such a way, and residual SO is generated at the air outlet at the bottom of the incinerator2Acidic pollutants such as HCl and the like enter the oxidation chamber through the back blowing of the back blowing fan to avoid the contact with the waste gas to be treated containing ammonia (amine), thereby effectively solving the problem ofThe problem of blockage caused by crystallization of various organic amine salts and inorganic ammonium salts at the bottom of the RTO furnace. And because the back-blowing fan blows the heat carried by the burnt waste gas back to the hearth, the temperature at the bottom of the heat storage chamber is reduced, the heat loss is less, the heat efficiency of the system is improved, and the RTO is more energy-saving.
The invention only needs to add a regenerator on the basis of the original three-bed RTO, the total treatment and purification efficiency of the four-bed type regenerator is more than 99 percent, secondary pollution of ammonium salt solid waste, ammonia nitrogen-containing wastewater and the like is not generated, and the blockage of various ammonium chloride, (ammonium sulfite), triethylamine hydrochloride and other substances on the heat storage ceramic body can be effectively prevented, thereby further improving the stability and the safety of the ammonia (amine) -containing, chlorine-containing and sulfur-containing waste gas treatment system. The RTO regenerator adopts a method of firstly back blowing cleaning and then waste gas burning, the bottom temperature of the regenerator is effectively reduced, the heat loss is less, the thermal efficiency of the system is higher, and the RTO system is more energy-saving.
Claims (9)
1. A method for improving the organic waste gas treatment efficiency by adopting a four-bed RTO is characterized by comprising the following steps:
(1) a first circulation stage: an air inlet valve (1) of a regenerator A, an air outlet valve (4) of a regenerator B, a back flushing valve (11) of a regenerator C and a back flushing valve (12) of a regenerator D are opened, other valves are closed, organic waste gas enters an oxidation chamber (22) for combustion after being preheated by the regenerator A (13), then is discharged by the air outlet valve (4) of the regenerator B, meanwhile, a cleaning fan (21) back flushes air into the regenerator C (15) and the regenerator D (16) through the back flushing valve (11) of the regenerator C and the back flushing valve (12) of the regenerator D, and the combusted waste gas is discharged to an air outlet header pipe (19) through the air outlet valve (4) of the regenerator B; entering a second circulation stage of the step (2) after the set time;
(2) and a second circulation stage: a regenerative chamber C blowback valve (11) and a regenerative chamber D blowback valve (12) are closed in sequence, a regenerative chamber D gas outlet valve (8) and a regenerative chamber C gas inlet valve (5) are opened in sequence, a regenerative chamber A gas inlet valve (1) and a regenerative chamber B gas outlet valve (4) are closed in sequence, a regenerative chamber A blowback valve (9) and a regenerative chamber B blowback valve (10) are opened in sequence, other valves are kept closed, organic waste gas enters an oxidation chamber (22) for combustion after being preheated by a regenerative chamber C (15), then is discharged by the regenerative chamber D gas outlet valve (8), meanwhile, a cleaning fan (21) blows air back into the regenerative chamber A (13) and the regenerative chamber B (14) through the regenerative chamber A blowback valve (9) and the regenerative chamber B blowback valve (10), and the combusted waste gas is discharged to a gas outlet header pipe (19) through the regenerative chamber D gas outlet valve (8); entering a third circulation stage of the step (3) after the set time;
(3) a third circulation stage: a reverse blowing valve (9) of a regenerator A and a reverse blowing valve (10) of a regenerator B are closed in sequence, an air outlet valve (2) of the regenerator A and an air inlet valve (3) of the regenerator B are opened in sequence, an air inlet valve (5) of the regenerator C and an air outlet valve (8) of the regenerator D are closed in sequence, a reverse blowing valve (11) of the regenerator C and a reverse blowing valve (12) of the regenerator D are opened in sequence, other valves are kept closed, organic waste gas is preheated by the regenerator B (14) and enters an oxidation chamber (22) for combustion, then is discharged by the air outlet valve (2) of the regenerator A, and meanwhile, a cleaning fan (21) reversely blows air into the regenerator C (13) and the regenerator D (14) by the reverse blowing valve (11) of the regenerator B, and the combusted waste gas is discharged to an air outlet header pipe (19) by the air outlet valve (2) of the regenerator A; entering a cycle stage four of the step (4) after the set time;
(4) and a fourth circulation stage: the regenerative chamber C blowback valve (11) and the regenerative chamber D blowback valve (12) are closed in sequence, the regenerative chamber C gas outlet valve (6) and the regenerative chamber D gas inlet valve (7) are opened in sequence, the regenerative chamber B gas inlet valve (3) and the regenerative chamber A gas outlet valve (2) are closed in sequence, the regenerative chamber A blowback valve (9) and the regenerative chamber B blowback valve (10) are opened in sequence, other valves are kept closed, organic waste gas is preheated by the regenerative chamber D (14) to enter the oxidation chamber (22) for combustion, then is discharged by the regenerative chamber C gas outlet valve (6), meanwhile, a cleaning fan (21) blows air back by the regenerative chamber A blowback valve (9) and the regenerative chamber B blowback valve (10) to enter the regenerative chamber A (13) and the regenerative chamber B (14), and the combusted waste gas is discharged to the gas outlet header pipe (19) by the regenerative chamber C gas outlet valve (6); returning to the step (1) again after the set time, and starting the next cycle;
the four-bed RTO comprises a regenerator A (13), a regenerator B (14), a regenerator C (15), a regenerator D (16), an oxidation chamber (22), an air inlet header pipe (17), a cleaning header pipe (18) and an air outlet header pipe (19); the heat storage chambers A (13), B (14), C (15) and D (16) are arranged in series, and the tops of the four heat storage chambers are communicated with the oxidation chamber (22); the structures of the heat storage chambers A (13), B (14), C (15) and D (16) are the same, and heat storage bodies are filled in the four heat storage chambers;
a regenerator A air inlet pipeline and a regenerator A purging pipeline are arranged on one side of the regenerator A (13), a regenerator A air outlet pipeline is arranged on the other side of the regenerator A, a regenerator A air inlet valve (1) is arranged on the regenerator A air inlet pipeline, a regenerator A blowback valve (9) is arranged on the regenerator A purging pipeline, and a regenerator A air outlet valve (2) is arranged on the regenerator A air outlet pipeline; the air inlet pipeline of the regenerator A is connected with an air inlet header pipe (17); the purging pipeline of the regenerator A is connected with a purging header pipe (18); the outlet pipeline of the regenerator A is connected with an outlet header pipe (19);
the connection structures between the regenerators B (14), C (15) and D (16) and the air inlet header pipe (17), the cleaning header pipe (18) and the air outlet header pipe (19) are the same as the connection structures between the regenerators A (13) and the air inlet header pipe (17), the cleaning header pipe (18) and the air outlet header pipe (19).
2. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein the set time is a time required for complete combustion of the waste gas and is calculated from a real-time temperature of the oxidation chamber.
3. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein the sections of the regenerator a (13), the regenerator B (14), the regenerator C (15), and the regenerator D (16) are square or circular.
4. The method of improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein the heat accumulator is a ceramic material, the bottommost layer is random packing, the middle layer is structured packing, and the uppermost layer is random packing.
5. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 4, wherein said random packing is a ceramic intalox ring.
6. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein an auxiliary burner is provided in the oxidation chamber (22).
7. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein the regenerators a (13), B (14), C (15), D (16) and the oxidizer (22) are provided with refractory bricks and ceramic fibers.
8. The method for improving organic waste gas treatment efficiency using a four-bed RTO according to claim 1, wherein the checker chamber a (13), the checker chamber B (14), the checker chamber C (15), the checker chamber D (16), and the oxidizer chamber (22) are provided with inspection doors.
9. The method for improving the organic waste gas treatment efficiency by adopting the four-bed RTO according to the claim 1, characterized in that the air inlet of the air inlet main pipe (17) is provided with a main fan (20), and the air inlet of the scavenging main pipe (18) is provided with a scavenging fan (21).
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| KR20040096884A (en) * | 2004-10-05 | 2004-11-17 | (주)키이엔지니어링 | Regenerative thermal oxidizer with different number of in/out bed |
| CN109899812A (en) * | 2019-03-19 | 2019-06-18 | 南京晨光集团有限责任公司 | A kind of anti-coking blocking heat accumulating type organic exhaust gas oxidation furnace |
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| KR20040096884A (en) * | 2004-10-05 | 2004-11-17 | (주)키이엔지니어링 | Regenerative thermal oxidizer with different number of in/out bed |
| CN109899812A (en) * | 2019-03-19 | 2019-06-18 | 南京晨光集团有限责任公司 | A kind of anti-coking blocking heat accumulating type organic exhaust gas oxidation furnace |
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