CN214552360U - Purify device that sulfur dioxide pollutes among lost foam casting waste gas - Google Patents
Purify device that sulfur dioxide pollutes among lost foam casting waste gas Download PDFInfo
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- CN214552360U CN214552360U CN202120609320.2U CN202120609320U CN214552360U CN 214552360 U CN214552360 U CN 214552360U CN 202120609320 U CN202120609320 U CN 202120609320U CN 214552360 U CN214552360 U CN 214552360U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a purify device that sulfur dioxide pollutes among lost foam casting waste gas, including high temperature oxygen boosting superatmospheric pressure intensive combustion purifier, water smoke absorption section, cooling zone, recovery pond and purification discharge port, high temperature oxygen boosting superatmospheric pressure intensive combustion purifiesThe combustion chamber, the water mist absorption section and the cooling section of the device are sequentially communicated, and the outlet end of the cooling section is communicated with a recovery tank and a purification discharge port. And a water mist spray head communicated with a water source is arranged in the water mist absorption section. The utility model discloses break SO3The theory and the current situation that water is not suitable for absorption are overcome, the technical bias is overcome, the phenomena of acid mist retention and subsequent reaction obstruction in the absorption process can be avoided by airflow movement, the absorption rate is high, and the absorption speed is high; not only purify SO2And can recycle the dilute sulfuric acid for comprehensive utilization; the double purification effect of purifying benzene and sulfur dioxide is achieved; the device has low manufacturing cost, is simple and easy to operate, and is safe and reliable.
Description
Technical Field
The utility model relates to a SO in lost foam casting waste gas2The purification field especially relates to a purify device that sulfur dioxide pollutes among lost foam casting waste gas.
Background
The international lost foam casting industry has been applied for more than 60 years, and 5000 lost foam casting plants are in development and increase in China, but the SO in the lost foam casting waste gas is not reported in public at home and abroad up to now2Record of severe contamination. The monitoring results of the national qualified environmental protection monitoring organization since 2019 show that: SO in exhaust gas discharged from lost foam casting2The concentration of the active carbon is over-standard by thousands of times and is remarkably high (mostly 3000-5000 mg/m)3) This is a very serious problem.
The waste gas of lost foam casting is benzene and SO2、CO2The mixed gas of the components is discharged from an exhaust pipe of a vacuum pump, wherein the benzene compounds are insoluble in water, and SO is2The reaction with water being reversible (SO)2+H2O
H2SO3) Therefore, SO is absorbed by water2Is impractical and unfeasible. To remove SO2Oxidation to SO3The sulfuric acid generated by water absorption is an exothermic reaction, because the temperature is very high, the generated sulfuric acid is formed into strong acid mist and stagnated in an absorption tower, SO that the reaction is stagnated and blocked, the absorption rate and the absorption speed are seriously reduced, and the SO is not absorbed by water in domestic and foreign industrial production3But is instead absorbed with 98% strength sulfuric acid. This method is impractical and unsafe for more than five thousand lost foam casting plants in the country.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, the utility model provides a purify device that sulfur dioxide pollutes among lost foam casting waste gas, this kind of method absorptivity is high, and the absorption rate is fast, not only can purify SO2And can be recoveredComprehensively utilizing dilute sulfuric acid; the device has low manufacturing cost, is simple and easy to operate, and is safe and reliable.
Realize the utility model discloses the technical scheme of purpose is:
a method for purifying sulfur dioxide pollution in lost foam casting waste gas comprises the following steps:
1) firstly, the mixture contains SO2The lost foam waste gas is oxidized into high-temperature SO under the environment of high-temperature oxygen-enriched strong flow with the temperature not lower than 800 DEG C3A gas stream;
2) fluidized high temperature SO3The airflow passes through the pipeline of the water mist absorption section to generate mist dilute sulfuric acid;
3) the atomized dilute sulfuric acid enters a pipeline of a cooling section to be cooled under the pushing of airflow;
4) the cooled atomized dilute sulfuric acid is deposited in a liquid state and enters a recovery tank;
containing SO2The lost foam casting waste gas is purified.
Preferably, in the step 1), the waste gas is in a combustion chamber of an oxygen-enriched intensified burner of the high-temperature oxygen-enriched super-normal-pressure combustion purification device, and SO is added into the waste gas2Is oxidized into SO3。
Preferably, in the step 2), the length of the pipeline of the water mist absorption section is 3-5 m, and the inner diameter is phi 200-400 mm.
Preferably, in the step 3), the length of the pipeline of the cooling section is 20-30 m, and the inner diameter is phi 200-400 mm.
The device for purifying the sulfur dioxide pollution in the lost foam casting waste gas comprises a high-temperature oxygen-enriched super-atmospheric pressure intensified combustion purification device, a water mist absorption section, a cooling section, a recovery tank and a purification discharge port, wherein a combustion chamber of the high-temperature oxygen-enriched super-atmospheric pressure intensified combustion purification device, the water mist absorption section and the cooling section are sequentially communicated, and an outlet end of the cooling section is communicated with the recovery tank and the purification discharge port.
Preferably, the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device adopts a high-temperature oxygen-enriched super-atmospheric pressure combustion purification device disclosed by the authorization publication number of CN109780563B and named as a high-temperature oxygen-enriched super-atmospheric pressure intensified combustion purification method for benzene harmful substances in industrial waste gas.
And a waste gas collecting, sucking and sending system of the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device is communicated with a vacuum pump exhaust pipe of a lost foam casting waste gas release source, so that lost foam casting waste gas enters a combustion (oxidation) chamber of an oxygen-enriched intensified burner of the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device.
Preferably, the length of the pipeline of the water mist absorption section is 3-5 m, and the inner diameter is phi 200-400 mm.
Preferably, the length of the pipeline of the cooling section is 20-30 m, and the inner diameter is phi 200-400 mm.
Waste gas generated by pyrolysis of EPS (Expanded polystyrene) pattern in casting mold is exhausted by vacuum pump at a distance of 20-50 m3The flow rate of/min is sprayed out strongly, and the inner diameter of the exhaust pipe of the vacuum pump used in all lost foam casting factories in China is mostly phi 140-160 mm. The waste gas is input into a combustion chamber of the high-temperature oxygen-enriched supernormal pressure gasification combustion purification device with strong force, and combustible substances such as benzene in the waste gas generate H2O and CO2And SO2Is oxidized to generate SO3Then enters the pipeline of the water mist absorption section along with the high-temperature and high-pressure airflow to form a mixed gas of dilute sulfuric acid mist and water mist which can not stay in the pipeline of the water mist absorption section because the mixed gas of dilute sulfuric acid mist and water mist continues to flow forwards, SO that the water mist in the water mist absorption section can be promoted to treat SO3The dilute sulfuric acid mist is cooled and deposited in a recovery pool to be recovered, and the waste gas is purified and discharged from a purification discharge port.
The utility model relates to a handle SO2Formation of SO3The method of generating sulfuric acid by using flowing water mist for absorption and recycling utilizes SO2 Is easy to be oxidized into SO under the condition of high temperature and oxygen enrichment3The SO is efficiently absorbed by the strongly flowing water vapor stream3To generate dilute sulfuric acid, and then to recover or neutralize and purify the SO2-SO3Can be efficiently purified, and the sulfuric acid mist which is concentrated again under the action of strong airflow is also taken away with the airflow, so that H is ensured2O+SO3→H2SO4The reaction is not affected in the water mist absorption sectionThe reaction section of the pipeline at the water mist absorption section completely eliminates the detention of the acid mist, the absorption reaction rate is fast, and the mist acid is deposited into dilute sulfuric acid to be recovered in the flowing process along with the airflow to the discharge pipeline at the recovery tank and the purification discharge port, so that the purification and the recovery can be realized at the same time; SO (SO)3The temperature of the strong flow from the combustion chamber to the water mist absorption section is always above 400 ℃, and the water mist is sprayed in the pipeline of the high temperature section to be gasified at a very fast speed, SO that SO is efficiently absorbed3And the temperature of the air flow in the pipe is quickly reduced to about 100 ℃, so that the temperature is quickly reduced and the water is greatly saved.
The utility model has the advantages that:
1. break through SO3The theory and the current situation that water is not suitable for absorption are overcome, the technical bias is overcome, the phenomena of acid mist retention and subsequent reaction obstruction in the absorption process can be completely avoided by airflow movement, the absorption rate is high, and the absorption speed is high;
2. not only can purify SO2And can recycle the dilute sulfuric acid for comprehensive utilization;
3. the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device in the high-temperature oxygen-enriched super-atmospheric pressure intensified combustion purification method for purifying benzene harmful substances in industrial waste gas, which is disclosed by the name of an authorized bulletin number of 'CN 109780563B' for purifying benzene combustible waste gas, plays a role in double purification effect of purifying benzene and sulfur dioxide; the lost foam casting waste gas is a mixed gas of various benzene aromatic hydrocarbons, sulfur dioxide and other harmful substances, and no precedent of 'integrated' purification treatment of the benzene compounds and the sulfur dioxide in the same flow exists at home and abroad, so that the lost foam casting waste gas is more novel;
4. the device has low manufacturing cost, is simple and easy to operate, is safe and reliable, and can be applied to all lost foam casting factories.
Drawings
Fig. 1 is the structure schematic diagram of the device for purifying sulfur dioxide pollution in the lost foam casting waste gas in the embodiment of the present invention.
In the figure, 1 is a water mist absorption section 2, a cooling section 3, a recovery tank 4, a discharge port 5, a water source 6, a vacuum pump exhaust pipe 7, a combustion chamber 8 and an oxygen source.
The arrows in the figure indicate the direction of flow.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, it being understood that the examples described are only some, but not all, of the examples of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example (b):
a method for purifying sulfur dioxide pollution in lost foam casting waste gas comprises the following steps:
1) firstly, the mixture contains SO2The lost foam waste gas is oxidized into high-temperature SO under the environment of high-temperature oxygen-enriched strong flow with the temperature not lower than 800 DEG C3A gas stream;
2) fluidized high temperature SO3The airflow passes through the pipeline of the water mist absorption section to generate mist dilute sulfuric acid;
3) the atomized dilute sulfuric acid enters a pipeline of a cooling section to be cooled under the pushing of airflow;
4) the cooled atomized dilute sulfuric acid is deposited in a liquid state and enters a recovery tank;
containing SO2The lost foam casting waste gas is purified.
Further, in the step 1), SO is added into the combustion chamber of the oxygen-enriched intensified burner of the high-temperature oxygen-enriched supernormal pressure combustion purification device2Is oxidized into SO3(ii) a The temperature of a combustion chamber in the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device in the step 1) is more than 1300 ℃.
Further, in the step 2), the length of the pipeline of the water mist absorption section is 4m, and the inner diameter of the pipeline is 300 mm; in step 2), flowing high-temperature SO discharged from a combustion chamber of the high-temperature oxygen-enriched supernormal pressure combustion purification device at the temperature of more than 1300 DEG C3The temperature of the air flow is above 400 ℃.
Further, in step 3), the pipe length of the cooling section is 25m, and the inner diameter is Φ 300 mm.
As shown in figure 1, the device for purifying the sulfur dioxide pollution in the lost foam casting waste gas for realizing the method comprises a high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device, a water mist absorption section 1, a cooling section 2 and a recovery tank 3, wherein a combustion chamber 7 of the high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device, the water mist absorption section 1 and the cooling section 2 are sequentially communicated, and an outlet end of the cooling section 2 is communicated with the recovery tank 3 and a purification discharge port 4.
The high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device adopts a high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device which is disclosed by the authorization publication number CN109780563B and named as a high-temperature oxygen-enriched super-normal-pressure intensified combustion purification method for benzene harmful substances in industrial waste gas, and refers to the specification and the attached drawings of the specification which are disclosed by CN 109780563B.
The waste gas collecting, sucking and sending system of the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device is communicated with a vacuum pump exhaust pipe 6 of a lost foam casting waste gas release source, and an oxygen source 8 is arranged to be communicated with the vacuum pump exhaust pipe 6, so that lost foam casting waste gas enters a combustion chamber 7 of an oxygen-enriched intensified burner of the high-temperature oxygen-enriched super-atmospheric pressure combustion purification device.
The lost foam casting waste gas enters a combustion chamber 7 of a high-temperature oxygen-enriched super-atmospheric pressure combustion purification device, and SO is treated in the combustion chamber 7 under the environment of high temperature, oxygen enrichment and super-atmospheric pressure of not less than 800 DEG C2By oxidation to SO3。
Further, the length of the pipeline of the water mist absorption section 1 is 4m, the inner diameter of the pipeline is phi 300mm, a water mist spray head communicated with a water source 5 is arranged in the water mist absorption section 1, SO that the inner cavity of the water mist absorption section 1 is filled with water mist, and the high-temperature SO flowing in the step 1) is high in temperature3Evaporating the water mist into steam and high-temperature SO3Is efficiently absorbed in a strongly flowing water vapor stream to produce atomized dilute sulfuric acid.
Further, the pipe length of the cooling section 2 is 25m, and the inner diameter is Φ 300 mm.
The water vapor flows in the water mist absorption section 1 along the direction of organized discharge, the detention of acid mist is completely eliminated in the water mist absorption section 1, and the absorption reaction rate is fast.
SO3From oxygen-enriched intensified burnersThe temperature of the strong flow of the combustion chamber 7 to the water mist absorption section 1 is usually above 300 ℃, and the water mist is sprayed in the high-temperature pipe section to be gasified at a very high speed, SO that SO is efficiently absorbed3And the temperature of the air flow in the pipe is rapidly reduced to about 100 ℃, and because 1kg of water at normal temperature is changed into water vapor to absorb more than 5 times of the heat required by 1kg of water which is increased from the normal temperature to 100 ℃, the temperature is rapidly reduced and the discharge is realized, and 5 times of cooling water quantity can be saved.
Experimental data and results:
the utility model discloses discharge concentration through detecting sulfur dioxide accords with national environmental protection limit value standard.
The following are measured data:
detection time: 2019.11.21, respectively;
monitoring unit: guangxi Guilin JinGui environmental monitoring Co., Ltd, which is an environmental protection professional detection mechanism with national qualification, provides a monitoring report with CMA metering authentication mark;
the unit to be tested: guilin casting machinery science and technology Inc. (lost foam casting shop).
And (3) monitoring results:
1.SO2the sample concentration in the exhaust pipe 6 of the vacuum pump is 3.33 multiplied by 103mg/m3；
2. After purification treatment, sampling from a discharge pipe in the discharge port 4 to detect the concentration ND;
3. the detection limit value is 3mg/m according to the national environmental protection regulations3The purifying effect is the international advanced level.
The above is the measured data for combustion chamber temperatures above 1300 ℃. Experiments prove that when the temperature of the combustion chamber is not lower than 700 ℃, the emission of sulfur dioxide in the waste gas can be effectively reduced; when the temperature of the combustion chamber is not lower than 800 ℃, the emission concentration of sulfur dioxide can reach the national environmental protection limit standard; when the temperature of the combustion chamber is not lower than 1000 ℃, the emission concentration of the sulfur dioxide is far less than the national environmental protection limit value standard.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The device for purifying sulfur dioxide pollution in lost foam casting waste gas is characterized by comprising a high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device, a water mist absorption section, a cooling section, a recovery tank and a purification discharge port, wherein a combustion chamber of the high-temperature oxygen-enriched super-normal-pressure intensified combustion purification device, the water mist absorption section and the cooling section are sequentially communicated, and an outlet end of the cooling section is communicated with the recovery tank and the purification discharge port.
2. The apparatus for purifying sulfur dioxide pollution in waste gas from lost foam casting as claimed in claim 1, wherein said water mist absorption section is provided with a water mist nozzle connected to a water source.
3. The device for purifying the sulfur dioxide pollution in the waste gas of the lost foam casting as claimed in claim 1, wherein the length of the pipeline of the water mist absorption section is 3-5 m, and the inner diameter is phi 200 and 400 mm.
4. The apparatus for purifying sulfur dioxide pollution in the waste gas of lost foam casting according to claim 1, wherein the water mist absorption section has a pipe length of 4m and an inner diameter of Φ 300 mm.
5. The device for purifying the sulfur dioxide pollution in the waste gas of the lost foam casting as claimed in claim 1, wherein the length of the pipeline of the cooling section is 20-30 m, and the inner diameter is phi 200-400 mm.
6. The apparatus for purifying sulfur dioxide pollution in lost foam casting waste gas according to claim 1, wherein the cooling section has a pipe length of 25m and an inner diameter of Φ 300 mm.
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| CN202120609320.2U CN214552360U (en) | 2021-03-25 | 2021-03-25 | Purify device that sulfur dioxide pollutes among lost foam casting waste gas |
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| CN202120609320.2U CN214552360U (en) | 2021-03-25 | 2021-03-25 | Purify device that sulfur dioxide pollutes among lost foam casting waste gas |
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