CN101694298B - Chlorine-and-silicon-contained waste liquid and gas pollution-free treating method and recycling system thereof - Google Patents
Chlorine-and-silicon-contained waste liquid and gas pollution-free treating method and recycling system thereof Download PDFInfo
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- CN101694298B CN101694298B CN2009102100338A CN200910210033A CN101694298B CN 101694298 B CN101694298 B CN 101694298B CN 2009102100338 A CN2009102100338 A CN 2009102100338A CN 200910210033 A CN200910210033 A CN 200910210033A CN 101694298 B CN101694298 B CN 101694298B
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Abstract
The invention provide a chlorine-and-silicon-contained waste liquid and gas pollution-free treating method and a recycling system thereof. The method includes steps as follows: (1) burning; (2) afterheat absorbing; (3) dry method dust removing; (5) quenching; (6) wet method dust removing; (7) absorbing; (8) washing. After the burning of the step (1) and before the afterheat absorbing of the step (2), gas-solid separation is performed on chlorine-and-silicon-contained fuel gases produced by the step (1), and more than 50% of SiO2 solid particles with diameters larger than 10 microns in the fuel gases are separated. The system includes a high-temperature separator connected at an outlet position of an incinerator, and an outlet of the high-temperature separator is connected with an inlet ofa quenching waste heat boiler. By adopting the treating method and the recycling system, the problem of blockage of an afterheat recycling device can be effectively solved, HC1 removing rate can reach 99% after the fuel gases are purified, the amount of dust is smaller than 183mg per cubic meter when the amount of oxygen contained in the fuel gases reaches 7%, removing rate of main harmful organic compositions can reach 99.99%, and fuel gas emission can reach national standard.
Description
Technical field
The present invention relates to the recovery system of a kind of waste treatment method and incinerated matter thereof, be specifically related to a kind of chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method and recovery system thereof.
Background technology
In China; enhancing and the reinforcement of policies and regulations and the large quantities of rapid construction of chemical production device along with people's environmental protection consciousness; disposal technology to bazardous waste requires more and more higher; incineration technology has become an important technology in the chemical industry, and incinerator has become the important component part in the chemical plant installations.
Usually the discarded object of organic compound changes into CO through high temperature incineration
2And H
2Behind the O, to airborne release.As long as temperature is greater than 800 ℃ in the incinerator, and discarded object has enough time of staying in the furnace high-temperature district, and then discarded object can decompose basically fully, realizes nuisanceless discharging.But having in the waste liquid waste gas of some chemical production device by-products much is chlorine-and-silicon-contained organic substance, and they can give off HCl, SiO when burning
2The chlorine of particle and free state; Chlorine has very strong corrosivity, can cause the cold end corrosion of high temperature corrosion damage, back-end surfaces and the flue of heating surface; More seriously, chlorine is extremely malicious medium, easily environment is caused huge injury, and all there is strict regulation various countries to this.In addition, SiO
2Caking property is strong, can produce serious bonding blockage problem to the residual heat boiler for exchanging heat face.Therefore, how to realize the qualified discharge of chlorine-and-silicon-contained discarded object, and economical and efficient ground recovery waste heat, be the important topic of pendulum in face of the engineering design worker.
At present, domestication factory project begun newly all must have independently waste liquid, burned waste gas unit if there is chlorine-and-silicon-contained waste liquid waste gas to produce.And domestic burning disposal to chlorine-and-silicon-contained waste liquid waste gas rests on the experimental study stage mostly, and the introduction of foreign technology equipment investment is very big, and cost is high.
The applicant has applied for a patent (application number: 200810094373.4) about " chloride waste liquid, waste gas non-pollution processing method and isolated plant thereof " in earlier stage.This patent application discloses a kind of chloride waste liquid, waste gas non-pollution processing method, and it may further comprise the steps: burn (1): waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 800 ℃～1400 ℃; (2) waste heat absorbs: will be fed chilling formula waste heat boiler by the chloride flue gas that step (1) produces and make high-temperature flue-gas reduce to 200 ℃～300 ℃ by 800 ℃～1400 ℃, temperature fall time was less than 0.3 second; (3) dry method dust: will feed cyclone separator by the flue gas that step (2) obtain and carry out dry method dust; (4) chilling: will feed the quench tower chilling by the flue gas that step (3) obtain and be cooled to 60 ℃～70 ℃; (5) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (4) carried out wet dedusting; (6) absorb: the flue gas of step (5) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid, and water vapour is condensed into water; (7) washing: will feed packed tower by the flue gas that step (6) obtain, and in packed tower, add NaOH and Na
2SO
3The aqueous solution is as cleaning solution, the Cl of the HCl of the remnants in the flue gas and free state
2Gas neutralizes, then discharging.This patent application also discloses a kind of chloride waste liquid that can realize said method, the nuisanceless processing isolated plant of waste gas, it comprises burner, the incinerator that is connected with burner, incinerator connects worries the cold type waste heat boiler, chilling formula heat boiler outlet is connecting primary cyclone, primary cyclone is connecting secondary cyclone, the ash hole of the below of primary cyclone and secondary cyclone is being connected the displacement storehouse, the gas outlet in the gas outlet of secondary cyclone and displacement storehouse is communicated with the gas approach on quench tower top simultaneously, the dilute hydrochloric acid solution outlet of quench tower lower end has a branch road being communicated with Venturi tube through behind the pump, and another branch road is communicated with the watery hydrochloric acid outlet that is located at quench tower top simultaneously; The exhanst gas outlet of quench tower is connecting the gas approach of Venturi tube, the outlet of Venturi tube is connected with gas-liquid separator, the refluxing opening of gas-liquid separator bottom is connected with the acid solution refluxing opening of quench tower, the exhanst gas outlet of gas-liquid separator is connecting the gas approach of falling-film absorber, the watery hydrochloric acid outlet of falling-film absorber bottom is communicated with the watery hydrochloric acid import at falling-film absorber top through pump, the exhanst gas outlet of falling-film absorber is connected with the gas approach of packed tower bottom side, the cleaning solution outlet of packed tower bottom is connected with the cleaning solution import of packed tower shoulder through circulating pump, and the top of packed tower is a chimney.
Above-mentioned chloride waste liquid burned waste gas treatment system technology and device only are suitable for handling chloride but not siliceous waste liquid waste gas, in case contain chlorine compound and silicon compound in the waste liquid waste gas simultaneously, can produce a large amount of SiO after burning
2Deng the solid particle that has than strongly adherent, can cause waste-heat recovery device to stop up, whole technological equipment operation is had a strong impact on.The present invention proposes new process at this problem, can solve the blocked problem of waste-heat recovery device effectively, useful material can also be concentrated recycling simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of nuisanceless treatment effect is excellent, environmental protection and energy saving are good chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method and recovery system thereof.
A kind of chlorine-and-silicon-contained waste liquid of the present invention, waste gas non-pollution processing method, it may further comprise the steps:
(1) burns: waste liquid, waste gas are burned;
(2) waste heat absorbs: to the chlorine-and-silicon-contained flue gas cool-down that produces;
(3) dry method dust: the flue gas after the cooling is carried out dry method dust;
(5) chilling: the flue gas behind the dry method dust is lowered the temperature again;
(6) wet dedusting: above-mentioned gained flue gas is carried out wet dedusting;
(7) absorb: adopt the HCl gas in the flue gas after hydrochloric acid absorbs wet dedusting;
(8) washing: adopt NaOH and Na at last
2SO
3The solution washing flue gas makes the HCl of the remnants in the flue gas and the Cl of free state
2Gas neutralizes, then discharging.
It is after step (1) is burned, and before step (2) waste heat absorbed, the chlorine-and-silicon-contained flue gas that step (1) is produced carried out gas solid separation, makes 50% above diameter in the flue gas greater than 10 microns SiO
2Solid particle is separated.
Aforesaid a kind of chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method, its concrete steps are as follows:
(1) burn: waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 800 ℃～1400 ℃;
(2) gas solid separation: will feed high-temperature separator by the chlorine-and-silicon-contained flue gas that step (1) produces, and make 50% above diameter in the high-temperature flue gas greater than 10 microns SiO
2Solid particle is separated;
(3) waste heat absorbs: will be fed chilling formula waste heat boiler by the chlorine-and-silicon-contained flue gas that step (2) produces and make high-temperature flue-gas reduce to 200 ℃～300 ℃ by 800 ℃～1400 ℃, temperature fall time was less than 0.3 second;
(4) dry method dust: will feed cyclone separator by the flue gas that step (3) obtain and carry out dry method dust;
(5) chilling: will feed the quench tower chilling by the flue gas that step (4) obtain and be cooled to 60 ℃～70 ℃;
(6) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (5) carried out wet dedusting;
(7) absorb: the flue gas of step (6) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid, and water vapour is condensed into water; Described watery hydrochloric acid concentration is 05wt%～25wt%;
(8) washing: will feed packed tower by the flue gas that step (7) obtain, and in packed tower, add NaOH and Na
2SO
3The aqueous solution neutralizes the Cl2 gas of the HCl of the remnants in the flue gas and free state as cleaning solution, then discharging; Described NaOH and Na
2SO
3The concentration of the aqueous solution is respectively at 5wt%～10wt%.
A kind of chlorine-and-silicon-contained waste liquid of the present invention, the nuisanceless processing recovery system of waste gas, it comprises burner, incinerator is connected with burner; Chilling formula heat boiler outlet is connecting primary cyclone, primary cyclone is connecting secondary cyclone, the ash hole of the below of primary cyclone and secondary cyclone is being connected the displacement storehouse, the gas outlet in the gas outlet of secondary cyclone and displacement storehouse is communicated with the gas approach on quench tower top simultaneously, the dilute hydrochloric acid solution outlet of quench tower lower end has a branch road being communicated with Venturi tube through behind the pump, and another branch road is communicated with the watery hydrochloric acid outlet that is located at quench tower top simultaneously; The exhanst gas outlet of quench tower is connecting the gas approach of Venturi tube, the outlet of Venturi tube is connected with gas-liquid separator, the refluxing opening of gas-liquid separator bottom is connected with the acid solution refluxing opening of quench tower, the exhanst gas outlet of gas-liquid separator is connecting the gas approach of falling-film absorber, the watery hydrochloric acid outlet of falling-film absorber bottom is communicated with the watery hydrochloric acid import at falling-film absorber top through pump, the exhanst gas outlet of falling-film absorber is connected with the gas approach of packed tower bottom side, the cleaning solution outlet of packed tower bottom is connected with the cleaning solution import of packed tower shoulder through circulating pump, and the top of packed tower is a chimney; Its incinerator exit is connected with high-temperature separator, and the outlet of high-temperature separator links to each other with chilling formula exhaust-heat boiler inlet.
Aforesaid a kind of chlorine-and-silicon-contained waste liquid, the nuisanceless processing recovery system of waste gas, its described high-temperature separator adopts cyclone separator structure, has water-cooled or vapour device for cooling, and operating temperature is below 1400 ℃.
Effect of the present invention is: in the non-pollution processing method of the present invention, 800-1400 ℃ flue gas separates the bigger SiO of diameter in high-temperature separator
2Particle, efficient reach more than 50%, avoid residual heat boiler for exchanging heat face knot ash to stop up effectively, and have improved residual heat boiler for exchanging heat efficient.In apparatus of the present invention, incinerator is connecting high-temperature separator, and high-temperature separator connects worries the cold type waste heat boiler, chilling formula heat boiler outlet is connecting primary cyclone, owing to adopt high-temperature separator, avoided residual heat boiler for exchanging heat area ash blockage problem, and improved heat exchange efficiency.
Adopt method and apparatus of the present invention, can effectively solve the blocked problem of waste-heat recovery device, the HCl clearance reaches 99% after the gas cleaning, oxygenous amount is 7% o'clock in the flue gas, dust content is less than 183mg/m3, the clearance of main harmful organic composition reaches 99.99%, and fume emission is up to state standards.
Description of drawings
Fig. 1 is the schematic flow sheet of chlorine-and-silicon-contained waste liquid of the present invention, waste gas non-pollution processing method;
Fig. 2 is the structural principle schematic diagram of chlorine-and-silicon-contained waste liquid of the present invention, the nuisanceless processing recovery system of waste gas;
Among the figure: 1 burner, 2 incinerators, 3 high-temperature separators, 4 chilling formula waste heat boilers, 5 primary cyclones, 6 secondary cyclones, 7 displacement storehouses, 8 quench towers, 9 Venturi tubes, 10 gas-liquid separators, 11 falling-film absorbers, 12 chimneys, 13 packed towers.
A is waste liquid, waste gas before handling, and A1-A10 is the flue gas of different conditions, and B1-B4 is the watery hydrochloric acid in the different pipelines, C1-C2 is the watery hydrochloric acid of different pressures, and D1-D2 is the cleaning solution of different pressures, and E is saturated/superheated steam, F is the drum feedwater, and G is the solid grit, and H is a watery hydrochloric acid.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing chlorine-and-silicon-contained waste liquid of the present invention, waste gas non-pollution processing method and recovery system thereof are further described.
As described in Figure 1, a kind of chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method, it may further comprise the steps:
(1) burn: waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 800 ℃;
(2) gas solid separation: will feed high-temperature separator by the chlorine-and-silicon-contained flue gas that step (1) produces, high temperature resistant, corrosion-resistant, anti abrasive technical characteristic that high-temperature separator has, plurality of specifications and model are arranged, for example, adopt cyclone separator structure, have water cooling plant, operating temperature is below 1400 ℃, makes 50% above diameter in the high-temperature flue gas greater than 10 microns SiO
2Separate Deng solid particle;
(3) waste heat absorbs: will be fed chilling formula waste heat boiler by the flue gas that step (2) obtain and make high-temperature flue-gas reduce to 200 ℃ by 800 ℃, temperature fall time is 0.3 second;
(4) dry method dust: will feed cyclone separator by the flue gas that step (3) obtain and carry out dry method dust;
(5) chilling: will feed the quench tower chilling by the flue gas that step (4) obtain and be cooled to 60 ℃;
(6) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (5) carried out wet dedusting;
(7) absorb: the flue gas of step (6) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid of 5wt%, and water vapour is condensed into water;
(8) washing: will feed packed tower by the flue gas that step (7) obtain, adding concentration in packed tower is the NaOH of 5wt% and the Na of 5wt%
2SO
3The aqueous solution is as cleaning solution, the Cl of the HCl of the remnants in the flue gas and free state
2Gas neutralizes, then discharging.
As shown in Figure 2, a kind of chlorine-and-silicon-contained waste liquid that can realize said method, the nuisanceless processing recovery system of waste gas, it comprises burner 1, the incinerator 2 that is connected with burner 1, incinerator 2 exits are connected with high-temperature separator 3, the outlet of high-temperature separator 3 links to each other with chilling formula waste heat boiler 4 inlets, 4 outlets of chilling formula waste heat boiler are connecting primary cyclone 5, primary cyclone 5 is connecting secondary cyclone 6, the ash hole of the primary cyclone 5 and the below of secondary cyclone 6 is being connected displacement storehouse 7, the gas outlet in the gas outlet of secondary cyclone 6 and displacement storehouse 7 is communicated with the gas approach on quench tower 8 tops simultaneously, the dilute hydrochloric acid solution outlet of quench tower 8 lower ends has a branch road being communicated with Venturi tube 9 through behind the pump, and another branch road is communicated with the watery hydrochloric acid outlet that is located at quench tower 8 tops simultaneously; The exhanst gas outlet of quench tower 8 is connecting the gas approach of Venturi tube 9, the outlet of Venturi tube 9 is connected with gas-liquid separator 10, the refluxing opening of gas-liquid separator 10 bottoms is connected with the acid solution refluxing opening of quench tower 7, the exhanst gas outlet of gas-liquid separator 10 is connecting the gas approach of falling-film absorber 11, the watery hydrochloric acid outlet of falling-film absorber 11 bottoms is communicated with the watery hydrochloric acid import at falling-film absorber 11 tops through pump, the exhanst gas outlet of falling-film absorber 11 is connected with the gas approach of packed tower 13 bottom sides, the cleaning solution outlet of packed tower 13 bottoms is connected through the cleaning solution import of circulating pump with packed tower 13 shoulders, and the top of packed tower 13 is a chimney 12.
The concrete course of work of the present invention is: waste liquid, waste gas A burn in incinerator 2 through burner 1, whether add auxiliary fuel according to waste liquid, the decision of waste gas concrete condition, if the calorific value of waste liquid, waste gas is very high, can reach the needed calorific value of smooth combustion, then do not need auxiliary fuel, otherwise then need to add auxiliary fuel, auxiliary fuel can be a fuel gas, also can be fuel oil, to guarantee being in reasonable temperature at 800 ℃～1200 ℃ in the incinerator; The incineration residue of CIU bottom carries out landfill or is used for other purposes.800 ℃～1200 ℃ high-temperature flue gas that produce are by high-temperature separator 3, the SiO that diameter is bigger
2Fall etc. particle separation, feed chilling formula waste heat boiler 4 then and be cooled to about 200 ℃～300 ℃ and reclaim heat, the saturated/superheated steam E of generation goes to other departments of factory to be used; The flue gas that exports out from the chilling exhaust-heat boiler flue gas enters one-level, secondary cyclone 5 and 6 carries out dry method dust, the ash hole of solid grit bottom it that process high-temperature separator 3, one-level, secondary cyclone 5 and 6 are removed enters the displacement storehouse 7 of bottom, adopts the nitrogen replacement mode to remove and is mixed in the HCl among the solid grit G in the displacement storehouse 7; Enter in the quench tower 8 from quench tower 8 tops through the flue gas after one-level, secondary cyclone 5 and 6 dedustings, with the parallel heat and mass that carries out of the watery hydrochloric acid that from pump concentration afterwards is 1%～5%, flue-gas temperature is chilled to 60 ℃～70 ℃, the flue gas that comes out from quench tower 8 exhanst gas outlets enters Venturi tube 9 and gas-liquid separator 10 again, with carry out heat and mass from pump pickle B3 afterwards is parallel, carry out wet dedusting.Wet dedusting efficient, and different, the micron order efficiency of dust collection is up to more than 99% according to the difference of solid grit particle size, nanoscale level efficiency of dust collection is up to more than 95%; Flue gas after overdrying, wet dedusting comes out from the top of gas-liquid separator 10, gas approach through falling-film absorber 11 enters falling-film absorber 11, flue gas with from the parallel heat and mass that carries out of pump pickle C2 afterwards, HCl gas in the flue gas is dissolved in circulation and absorbs in the pickle, almost all being absorbed of HCl in the flue gas by watery hydrochloric acid, the water vapour in the flue gas is condensed into water simultaneously; The flue gas that comes out from falling-film absorber 11 exhanst gas outlets enters in the packed tower 13 through the gas approach of packed tower 13, with from pump afterwards contain Na
2SO
3The reverse contact of NaOH aqueous solution D2, the HCl remaining in the flue gas and the Cl of free state
2Gas neutralizes, and the flue gas that comes out from packed tower 13 tops is subsequently from chimney 12 dischargings.
Flue gas flow when the present invention works is as follows:
The flue gas A1 that comes out from incinerator 2 becomes flue gas A2 by high-temperature separator 3 backs;
A2 becomes flue gas A3 by chilling formula waste heat boiler 4 backs;
A3 is through 5 one-tenth flue gas A4 of primary cyclone;
A4 becomes flue gas A5 through the flue gas of secondary cyclone 6;
HCl, N that the displacement storehouse cements out
2Be mixed into flue gas A6;
A5 is mixed into the flue gas A7 that quench tower 8 chillings become 60-70 ℃ with A6;
A7 enters Venturi tube 9 to carry out wet dedusting with gas-liquid separator 10 and becomes flue gas A8;
A8 enters falling-film absorber 11 absorptions and wherein becomes flue gas A9 behind the HCl more than 95%;
13 washings are neutralized into the flue gas A10 that reaches discharging standards to A9 through packed tower;
A10 is through chimney 12 dischargings.
Quench tower 8 is as follows with the circulation process of 10 of Venturi tubes 9, gas-liquid separator:
The circulation process of falling-film absorber 11 is as follows:
The watery hydrochloric acid C1 of falling-film absorber 11 bottoms becomes watery hydrochloric acid C2 via circulating pump, and circulation absorbs the HCl in the flue gas.
The circulation process of packed tower 13 is as follows:
Packed tower 13 bottom wash liquid D1 become cleaning solution D2 through circulating pump, are used for HCl and Cl2 in circulation cleaning and the flue gas.
The separative efficiency of high-temperature separator of the present invention adopts cyclone separator structure more than 50%, has water cooling plant, and operating temperature is below 1400 ℃.Residual neat recovering system adopts chilling formula waste heat boiler to reclaim heat energy; Boiler operatiopn load is in 30%～130% scope, and the exhaust gas temperature of boiler is greater than the HCl dew-point temperature more than 50 ℃.The steam that residual neat recovering system produces and the watery hydrochloric acid of absorption system by-product are all delivered to other departments of factory and are used.The isolated solid grit of separation dust pelletizing system collects and carries out other processing.
As described in Figure 1, a kind of chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method, it may further comprise the steps:
(1) burn: waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 1400 ℃;
(2) gas solid separation: will feed high-temperature separator by the chlorine-and-silicon-contained flue gas that step (1) produces, high temperature resistant, corrosion-resistant, anti abrasive technical characteristic that high-temperature separator has, plurality of specifications and model are arranged, for example, adopt cyclone separator structure, have the vapour device for cooling, operating temperature is below 1400 ℃, makes 50% above diameter in the high-temperature flue gas greater than 10 microns SiO
2Separate Deng solid particle;
(3) waste heat absorbs: will be fed chilling formula waste heat boiler by the flue gas that step (2) obtain and make high-temperature flue-gas reduce to 300 ℃ by 1400 ℃, temperature fall time is 0.2 second;
(4) dry method dust: will feed cyclone separator by the flue gas that step (3) obtain and carry out dry method dust;
(5) chilling: will feed the quench tower chilling by the flue gas that step (4) obtain and be cooled to 70 ℃;
(6) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (5) carried out wet dedusting;
(7) absorb: the flue gas of step (6) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid of 25wt%, and water vapour is condensed into water;
(8) washing: the flue gas that will be obtained by step (7) feeds packed tower, and the Na2SO3 aqueous solution that adds NaOH that concentration is 10wt% and 10wt% in packed tower neutralizes the Cl2 gas of the HCl of the remnants in the flue gas and free state, then discharging as cleaning solution.
As described in Figure 1, a kind of chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method, it may further comprise the steps:
(1) burn: waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 1200 ℃;
(2) gas solid separation: will feed high-temperature separator by the chlorine-and-silicon-contained flue gas that step (1) produces, high temperature resistant, corrosion-resistant, anti abrasive technical characteristic that high-temperature separator has, plurality of specifications and model are arranged, for example, adopt cyclone separator structure, have water-cooled or vapour device for cooling, operating temperature is below 1400 ℃, makes 50% above diameter in the high-temperature flue gas greater than 10 microns SiO
2Separate Deng solid particle;
(3) waste heat absorbs: will be fed chilling formula waste heat boiler by the flue gas that step (2) obtain and make high-temperature flue-gas reduce to 250 ℃ by 1200 ℃, temperature fall time was less than 0.3 second;
(4) dry method dust: will feed cyclone separator by the flue gas that step (3) obtain and carry out dry method dust;
(5) chilling: will feed the quench tower chilling by the flue gas that step (4) obtain and be cooled to 65 ℃;
(6) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (5) carried out wet dedusting;
(7) absorb: the flue gas of step (6) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid of 15wt%, and water vapour is condensed into water;
(8) washing: will feed packed tower by the flue gas that step (7) obtain, adding concentration in packed tower is the NaOH of 7wt% and the Na of 8wt%
2SO
3The aqueous solution neutralizes the Cl2 gas of the HCl of the remnants in the flue gas and free state as cleaning solution, then discharging.
Adopt method and apparatus of the present invention, can effectively solve the blocked problem of waste-heat recovery device, the HCl clearance reaches 99% after the gas cleaning, oxygenous amount is 7% o'clock in the flue gas, dust content is less than 183mg/m3, the clearance of main harmful organic composition reaches 99.99%, and fume emission is up to state standards.The present invention is applicable to the nuisanceless processing of chlorine-and-silicon-contained waste liquid, waste gas of chemical industry.
Claims (2)
1. a chlorine-and-silicon-contained waste liquid, waste gas non-pollution processing method, it may further comprise the steps:
(1) burn: waste liquid, waste gas are fed in burner and the incinerator and burns, and incineration temperature is 800 ℃～1400 ℃;
(2) gas solid separation: will feed high-temperature separator by the chlorine-and-silicon-contained flue gas that step (1) produces, and make 50% above diameter in the high-temperature flue gas greater than 10 microns SiO
2Solid particle is separated;
(3) waste heat absorbs: will be fed chilling formula waste heat boiler by the chlorine-and-silicon-contained flue gas that step (2) produces and make high-temperature flue-gas reduce to 200 ℃～300 ℃ by 800 ℃～1400 ℃, temperature fall time was less than 0.3 second;
(4) dry method dust: will feed cyclone separator by the flue gas that step (3) obtain and carry out dry method dust;
(5) chilling: will feed the quench tower chilling by the flue gas that step (4) obtain and be cooled to 60 ℃～70 ℃;
(6) wet dedusting: flue gas feeding Venturi tube and the gas-liquid separator that is obtained by step (5) carried out wet dedusting;
(7) absorb: the flue gas of step (6) feeds falling-film absorber and watery hydrochloric acid heat and mass, and the HCl gas in the flue gas is dissolved in the watery hydrochloric acid, and water vapour is condensed into water; Described watery hydrochloric acid concentration is 5wt%～25wt%;
(8) washing: will feed packed tower by the flue gas that step (7) obtain, and in packed tower, add NaOH and Na
2SO
3The aqueous solution is as cleaning solution, the Cl of the HCl of the remnants in the flue gas and free state
2Gas neutralizes, then discharging; Described NaOH and Na
2SO
3The concentration of the aqueous solution is respectively at 5wt%～10wt%.
2. a chlorine-and-silicon-contained waste liquid, the nuisanceless processing recovery system of waste gas, it comprises burner (1), incinerator (2) is connected with burner (1); Chilling formula waste heat boiler (4) outlet is connecting primary cyclone (5), primary cyclone (5) is connecting secondary cyclone (6), the ash hole of the primary cyclone (5) and the below of secondary cyclone (6) is being connected displacement storehouse (7), the gas outlet in the gas outlet of secondary cyclone (6) and displacement storehouse (7) is communicated with the gas approach on quench tower (8) top simultaneously, the dilute hydrochloric acid solution outlet of quench tower (8) lower end has a branch road being communicated with Venturi tube (9) through behind the pump, and another branch road is communicated with the watery hydrochloric acid outlet that is located at quench tower (8) top simultaneously; The exhanst gas outlet of quench tower (8) is connecting the gas approach of Venturi tube (9), the outlet of Venturi tube (9) is connected with gas-liquid separator (10), the refluxing opening of gas-liquid separator (10) bottom is connected with the acid solution refluxing opening of quench tower (8), the exhanst gas outlet of gas-liquid separator (10) is connecting the gas approach of falling-film absorber (11), the watery hydrochloric acid outlet of falling-film absorber (11) bottom is communicated with the watery hydrochloric acid import at falling-film absorber (11) top through pump, the exhanst gas outlet of falling-film absorber (11) is connected with the gas approach of packed tower (13) bottom side, the cleaning solution outlet of packed tower (13) bottom is connected through the cleaning solution import of circulating pump with packed tower (13) shoulder, and the top of packed tower (13) is chimney (12); It is characterized in that: described incinerator (2) exit is connected with high-temperature separator (3), and the outlet of high-temperature separator (3) links to each other with chilling formula waste heat boiler (4) inlet; Described high-temperature separator (3) adopts cyclone separator structure, has water-cooled or vapour device for cooling, and operating temperature is below 1400 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN101922717A (en) * | 2010-07-26 | 2010-12-22 | 化学工业第二设计院宁波工程有限公司 | Method for burning organic silicon waste gas and recycling diluted hydrochloric acid |
| CN102410543A (en) * | 2011-03-18 | 2012-04-11 | 江苏宏图洁环保工程设备有限公司 | Incinerator special for organosilicon waste residue slurry |
| CN102757148B (en) * | 2011-04-28 | 2014-07-09 | 陕西天宏硅材料有限责任公司 | System and method for processing waste gas and waste liquor in polysilicon production |
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| CN102679369B (en) * | 2012-05-15 | 2014-06-18 | 北京航天动力研究所 | Suspended-state fluidization hydrolysis chlorine and silicon-containing waste incineration device |
| CN103438466B (en) * | 2013-09-09 | 2015-11-25 | 北京航天动力研究所 | A kind of method and device utilizing glyphosate mother solution calcining at constant temperature production sodium pyrophosphate |
| CN104876224B (en) * | 2015-05-11 | 2017-04-12 | 山东博润工业技术股份有限公司 | Organosilicon waste recovery treatment device and treatment method thereof |
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| CN112628772B (en) * | 2020-10-19 | 2022-08-05 | 湖北兴瑞硅材料有限公司 | Process for burning waste gas generated in production of methyl chlorosilane |
| CN113198278B (en) * | 2021-04-21 | 2022-07-22 | 江苏科技大学 | Steam dust removal system and working method thereof |
| CN113663436A (en) * | 2021-07-30 | 2021-11-19 | 华陆工程科技有限责任公司 | Improved method and device for wet dust removal of organic silicon and polycrystalline silicon production system |
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