Heat accumulating type incinerator system for refrigerator crushing waste gas treatment

Abstract

The utility model relates to the field of refrigerator waste gas treatment, in particular to a heat storage type incinerator system for refrigerator broken waste gas treatment, which comprises a bag-type dust collector, a heat storage combustion furnace and an absorption tower, the bag-type dust collector is connected to the bottom of the heat storage combustion furnace through a waste gas guide pipe, and a liquid guide pipe is arranged at the bottom of the heat storage combustion furnace; the liquid conduit is connected to the absorption tower, the bag-type dust remover comprises a dust removal chamber and a dust removal barrel, the dust removal chamber is provided with dust removal cloth, the dust removal barrel is mounted at the bottom of the dust removal chamber, the waste gas conduit is connected to the top of the dust removal barrel, waste gas is fed into the heat storage combustion furnace through the blower, and the heat storage combustion furnace is connected to the bottom of the absorption tower through the gas conduit; the absorption tower is provided with a filling layer which is provided with a plurality of filling holes; a liquid sprayer is arranged at the top of the filling layer and is used for spraying a sodium hydroxide solution; the top of the absorption tower is connected with an exhaust chimney through an exhaust conduit. The device has the effect of reducing equipment corrosion caused by waste gas.

Description

Technical Field

[0001] This application relates to the field of refrigerator exhaust gas treatment, and in particular to a regenerative thermal ignition system for treating refrigerator crushed exhaust gas. Background Technology

[0002] In industrial settings such as refrigerator breakage, the exhaust gas contains special components such as Freon and cyclopentane. The highly corrosive gases such as hydrogen fluoride (HF) and hydrogen chloride (HCl) generated by their combustion are corrosive to the equipment.

[0003] In existing related technologies, after the exhaust gas is burned with a catalyst and air, the gas produced by the combustion exhaust gas is absorbed by the corresponding adsorbent material, and finally the treated gas is discharged after being cleaned.

[0004] Regarding the aforementioned technologies, the exhaust gas after combustion is not completely absorbed, making it prone to corroding the equipment. Summary of the Invention

[0005] To address the issue of waste gas corroding equipment, this application provides a regenerative incinerator system for treating waste gas from refrigerator crushing.

[0006] The regenerative thermal ignition system for treating refrigerator crushing waste gas provided in this application adopts the following technical solution:

[0007] A regenerative thermal ignition system for treating refrigerator crushed waste gas includes a bag filter, a regenerative combustion furnace, and an absorption tower.

[0008] The bag filter is connected to an exhaust gas inlet. The bag filter is connected to the bottom of the regenerative thermal ignition furnace via an exhaust gas duct. A liquid duct is installed at the bottom of the regenerative thermal ignition furnace and is connected to the absorption tower.

[0009] The bag filter includes a dust collection chamber and a dust collection bucket. The dust collection chamber is equipped with a dust collection cloth, which is either woven filter cloth or non-woven felt. The dust collection bucket is installed at the bottom of the dust collection chamber. The exhaust gas duct is connected to the top of the dust collection bucket. The exhaust gas duct is equipped with a blower, which sends the exhaust gas into the regenerative combustion furnace.

[0010] The regenerative combustion furnace is connected to the bottom of the absorption tower via a gas duct;

[0011] The absorption tower is provided with a filling layer, and the filling layer has a plurality of filling holes; a liquid sprayer is provided on the top of the filling layer, and the liquid sprayer is used to spray sodium hydroxide solution.

[0012] The top of the absorption tower is connected to an exhaust chimney via an exhaust duct.

[0013] By adopting the above technical solution, the exhaust gas first passes through a bag filter dust collector, using woven filter cloth or non-woven felt dust collection cloth to remove dust particles from the exhaust gas. A dust collector bucket is installed at the bottom of the dust collection chamber to collect and clean deposited dust, preventing secondary dust generation. A regenerative thermal oxidizer decomposes harmful components in the exhaust gas, such as Freon and cyclopentane, through high-temperature oxidation. Simultaneously, a liquid conduit at the bottom can promptly discharge the accumulated liquid (such as hydrofluoric acid and hydrochloric acid) produced during combustion to the absorption tower, reducing equipment corrosion. In the absorption tower, the gas and liquid in the packing layer come into countercurrent contact with a sodium hydroxide solution, neutralizing highly corrosive gases such as hydrogen fluoride and hydrogen chloride produced during combustion, generating sodium fluoride and sodium chloride solutions to remove residual acidic components from the combustion gases. The packing layer also has several filling holes to increase the gas-liquid reaction contact area. Finally, the clean gas is discharged through an exhaust conduit connected to the top of the absorption tower.

[0014] Optionally, the regenerative combustion furnace includes a common combustion furnace, a first ceramic combustion furnace, a second ceramic combustion furnace, and a third ceramic combustion furnace, which are connected to the first, second, and third ceramic combustion furnaces via the common combustion furnace. Ceramic regenerators are installed at the bottom of the first, second, and third ceramic combustion furnaces.

[0015] By adopting the above technical solution, the coordinated operation of the common combustion furnace and the three ceramic combustion furnaces can be facilitated. Simultaneously, the first, second, and third ceramic combustion furnaces are used alternately in a cyclical manner to facilitate the recovery and utilization of heat energy from waste gas treatment. The ceramic regenerators at the bottom of the three ceramic combustion furnaces employ an alternating heat storage-heat release working mode, recovering the heat from the high-temperature flue gas generated by combustion and using it to preheat newly entering waste gas, thereby maintaining a good heat exchange state and stabilizing the temperature within the regenerable combustion furnace within a specific temperature range.

[0016] Optionally, the exhaust gas duct is connected to a purge fan.

[0017] By adopting the above technical solution, it is possible to blow the waste gas in the waste duct to the regenerative combustion furnace.

[0018] Optionally, the liquid conduit is connected to a medicine tank for containing sodium hydroxide solution, and the liquid sprayer is connected to the medicine tank.

[0019] By adopting the above technical solution, the chemical tank facilitates the storage and supply of sodium hydroxide solution. A liquid conduit continuously supplies sodium hydroxide solution to the absorption tower, ensuring a thorough neutralization reaction between the sodium hydroxide solution and the acidic gases. The connection between the liquid sprayer and the chemical tank forms a circulation system, allowing the sodium hydroxide solution to be evenly sprayed onto the packing layer of the absorption tower, ensuring sufficient contact and reaction with the rising hydrogen fluoride and hydrogen chloride-containing waste gases. Simultaneously, any unreacted sodium hydroxide solution can be returned to the chemical tank for reuse.

[0020] Optionally, a plurality of absorption towers are provided, and the tops and bottoms of the plurality of absorption towers are connected sequentially by gas conduits.

[0021] By adopting the above technical solution, gas ducts are connected sequentially to the top and bottom of multiple absorption towers to form a series connection, which greatly increases the contact time and reaction area between the waste gas and the sodium hydroxide solution.

[0022] Optionally, a demister may be installed at the top of several of the absorption towers.

[0023] By adopting the above technical solutions, it is possible to reduce the problems of aerosol and droplet entrainment during the waste gas treatment process, reduce the crystallization of salts produced by the neutralization reaction, and reduce the emission of unreacted sodium hydroxide solution with the exhaust gas.

[0024] Optionally, exhaust gas fans are provided between several of the absorption towers.

[0025] By adopting the above technical solution, the exhaust gas can pass through each absorption tower sequentially. At the same time, the exhaust gas fan can effectively promote the continuous flow of exhaust gas and reduce gas stagnation.

[0026] Optionally, the gas conduit is fitted with a heating sleeve, and a liquid chamber is formed between the heating sleeve and the gas conduit, the liquid chamber containing a heating liquid.

[0027] By adopting the above technical solution, the liquid chamber formed by the heating sleeve and the gas conduit maintains the temperature of the gas conduit within a certain range through the circulating heating liquid, thereby reducing the condensation of acidic gas caused by sudden temperature changes during the transportation of fluorine-containing waste gas and thus reducing the occurrence of "ice blockage".

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By using woven filter cloth or non-woven felt as dust removal cloth to filter dust particles in the exhaust gas, and by using a blower to send the exhaust gas into the regenerative combustion furnace;

[0030] 2. A regenerative combustion furnace combined with a ceramic heat storage body is adopted to recover heat from the waste gas through an alternating heat storage-heat release mode, so as to maintain the temperature inside the furnace within the optimal range;

[0031] 3. The acidic gas comes into countercurrent contact with the sodium hydroxide solution to facilitate the neutralization reaction of the acidic gas. At the same time, the filling holes of the filling layer increase the gas-liquid reaction area to facilitate the full neutralization reaction between the sodium hydroxide solution and the acidic gas.

[0032] 4. By connecting multiple absorption towers in series, the reaction time between acidic gas and sodium hydroxide solution is increased, so as to further optimize the treatment effect of acidic gas;

[0033] 5. Demisters are installed at the top of each absorption tower to reduce the entrainment of aerosols and droplets during the treatment of acidic gases, and to prevent salt crystallization and unreacted liquids from being emitted with the exhaust gas;

[0034] 6. The gas conduit is equipped with a heating sleeve to reduce the condensation of acidic gases caused by temperature drop during the transportation of fluorine-containing waste gas, thereby reducing the occurrence of "ice blockage". Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0036] Figure 2 This is a cross-sectional schematic diagram of a bag filter according to an embodiment of this application.

[0037] Figure 3 This is a cross-sectional schematic diagram of a regenerative combustion furnace according to an embodiment of this application.

[0038] Figure 4 This is a schematic diagram of the absorption tower according to an embodiment of this application.

[0039] Figure 5 This is a side view schematic diagram of the absorption tower according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Baghouse dust collector; 101. Dust collection chamber; 102. Dust collection cloth; 11. Dust collection bucket; 103. Exhaust gas duct; 104. Blower; 105. Combustion aid; 106. Compressed air tank; 107. Purge blower; 2. Regenerative combustion furnace; 21. Common combustion furnace; 22. First ceramic combustion furnace; 23. Second ceramic combustion furnace; 24. Third ceramic combustion furnace; 25. Ceramic regenerator; 201. Liquid duct; 202. Chemical tank; 3. Absorption tower; 301. Filling hole; 31. Filling layer; 32. Liquid sprayer; 33. Demister; 34. Heating sleeve; 302. Gas duct; 303. Exhaust gas fan; 304. Liquid chamber; 4. Exhaust chimney. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0042] This application discloses a regenerative thermal ignition system for treating refrigerator crushing waste gas. (Refer to...) Figure 1 The regenerative thermal oxidizer system for treating refrigerator crushed waste gas includes a bag filter 1, a regenerative thermal oxidizer 2, and an absorption tower 3.

[0043] In this embodiment, the gas being processed is the exhaust gas generated by the crushed refrigerator, which mainly contains gases such as Freon and cyclopentane. (Refer to...) Figure 2 The baghouse dust collector 1 is connected to an exhaust gas inlet. The exhaust gas first passes through the baghouse dust collector 1 to remove dust particles from the exhaust gas. The baghouse dust collector 1 includes a dust collection chamber 101 and a dust collection bucket 11. The dust collection chamber 101 is equipped with a dust collection cloth 102, which is either woven filter cloth or non-woven felt. The filter bags of the baghouse dust collector 1 are round bags. The dust in the exhaust gas is blocked by the dust collection cloth 102 in the dust collection chamber 101, so that dust with large particle size and specific gravity can be filtered through the dust collection cloth 102. The dust collection bucket 11 is installed at the bottom of the dust collection chamber 101, so that the filtered dust will naturally settle into the dust collection bucket 11 for collection by gravity, reducing secondary dust re-entrainment. At the same time, the dust attached to the dust collection cloth 102 cannot settle into the dust collection bucket 11 by gravity and can be removed by electromagnetic pulse jet airflow, which is not shown in the figure.

[0044] Specifically, in this example, the bag filter 1 is first turned on to ensure that the dust concentration in the exhaust gas is ≤10mg / m³.

[0045] Reference Figure 3 The top of the bag filter 1 is connected to the exhaust gas duct 103, and the other end of the exhaust gas duct 103 is connected to the bottom of the regenerative thermal oxidizer 2. The exhaust gas duct 103 is equipped with a blower 104 so that the exhaust gas filtered by the dust collection cloth 102 can be blown to the regenerative thermal oxidizer 2 through the blower 104.

[0046] The regenerative thermal oxidizer 2 includes a common combustion furnace 21, a first ceramic combustion furnace 22, a second ceramic combustion furnace 23, and a third ceramic combustion furnace 24. The common combustion furnace 21 is located at the top of the inner wall of the regenerative thermal oxidizer 2. The first, second, and third ceramic combustion furnaces 22, 23, and 24 are all located at the bottom of the regenerative thermal oxidizer 2, and are all connected to the common combustion furnace 21 to facilitate the combustion of gases such as Freon and cyclopentane in the exhaust gas. Ceramic heat storage bodies 25 are installed at the bottom of each of the first, second, and third ceramic combustion furnaces 22 and 23 to absorb heat from the exhaust gas after combustion. The bottoms of the first ceramic combustion furnace 22, the second ceramic combustion furnace 23, and the third ceramic combustion furnace 24 are all connected to exhaust gas ducts 103, and the conduction path is switched by a gas valve to control the heat storage and heat release state of the ceramic heat storage body 25, recover the heat of the high-temperature gas generated by combustion, and use it to preheat the newly entered exhaust gas, so as to stabilize the temperature in the heat storage combustion furnace 2 within a specific temperature range.

[0047] Specifically, in this embodiment, the initial temperature of the regenerative combustion furnace 2 is set to be higher than 956°C, and the waste gas combustion residence time is ≥2 seconds, so as to generate water, carbon dioxide and halogenated hydrogen from the waste gas and remove the generated dioxins.

[0048] Specifically, the regenerative thermal ignition furnace 2 is connected to a burner 105 and a compressed air tank 106. The burner 105 is used to ignite the combustion gas, and the burner 105 is connected to the combustion gas via a conduit. In this embodiment, the combustion gas used is natural gas. The intake volume of the combustion gas is adjusted by controlling the burner 105 to ensure that the exhaust gas achieves the optimal combustion ratio. The compressed air tank 106 is connected to an exhaust gas conduit 103, which is connected to a purge fan 107 to blow compressed air and exhaust gas to the regenerative thermal ignition furnace 2 for combustion.

[0049] The bottom of the regenerative combustion furnace 2 is equipped with a liquid conduit 201, which is connected to the absorption tower 3 to facilitate the mixing of the accumulated liquid, hydrofluoric acid and hydrochloric acid generated by the cooling combustion exhaust gas of the ceramic regenerator 25, and discharge them to the absorption tower 3 for neutralization reaction.

[0050] Reference Figure 4A liquid conduit 201 is connected to a chemical tank 202, which holds sodium hydroxide solution for storage and supply. Simultaneously, the liquid conduit 201 at the bottom of the regenerative combustion furnace 2 directly connects to the chemical tank 202, facilitating the neutralization reaction between the combustion liquid and the sodium hydroxide solution. The regenerative combustion furnace 2 is connected to the bottom of the absorption tower 3 via a gas conduit 302, guiding the exhaust gas after combustion to the bottom of the absorption tower 3. The absorption tower 3 has a packing layer 31, and a liquid sprayer 32 is installed at the top of the packing layer 31. The liquid sprayer 32 is connected to the chemical tank 202 via a pump, forming a circulation system that allows the sodium hydroxide solution to be evenly sprayed onto the packing layer 31 of the absorption tower 3, ensuring sufficient contact between the sodium hydroxide solution and the rising acidic gases such as hydrogen fluoride and hydrogen chloride. Unreacted sodium hydroxide solution can be returned to the chemical tank 202 for reuse.

[0051] Reference Figure 4 The liquid sprayer 32 is used to spray sodium hydroxide solution onto the filling layer 31, so that the acidic gas can come into countercurrent contact with the sodium hydroxide solution and be fully neutralized. At the same time, the filling layer 31 has a number of filling holes 301, thereby increasing the reaction contact area between the acidic gas and the sodium hydroxide solution, so that the sodium hydroxide solution and the acidic gas can fully neutralize each other.

[0052] Several absorption towers 3 are provided, and the tops and bottoms of the absorption towers 3 are connected sequentially by gas conduits 302 to increase the contact time between the acidic gas and the sodium hydroxide solution. At the same time, exhaust gas fans 303 are provided between the absorption towers 3 to promote the continuous flow of acidic gas and reduce gas stagnation.

[0053] Each of the absorption towers 3 is equipped with a demister 33 at its top to reduce the entrainment of aerosols and droplets during the treatment of acidic gases, reduce the crystallization of salts produced by the neutralization reaction, and reduce the emission of unreacted sodium hydroxide solution with the exhaust gas.

[0054] Reference Figure 5 The gas conduit 302 is fitted with a heating sleeve 34, and a liquid chamber 304 is formed between the heating sleeve 34 and the gas conduit 302, so as to add heating liquid, such as heated water, into the liquid chamber 304, thereby reducing the occurrence of condensation of water in the surrounding gas due to heat absorption during the transportation of fluorine-containing waste gas, thus reducing the occurrence of "ice blockage".

[0055] In addition, the top of the absorption tower 3 is connected to an exhaust chimney 4 via an exhaust duct to facilitate the discharge of the clean gas after treatment.

[0056] The implementation principle of a regenerative thermal ignition system for treating refrigerator crushed waste gas in this application embodiment is as follows:

[0057] First, the exhaust gas passes through the bag filter 1 through the exhaust gas inlet. The woven filter cloth or non-woven felt dust collector 102 filters out particulate matter and dust with a specific gravity in the exhaust gas, and the dust is collected by the dust collector 11 at the bottom of the dust collection chamber 101.

[0058] Subsequently, the filtered exhaust gas is blown to the regenerative combustion furnace 2 with an initial temperature higher than 956°C by the blower 104, and the connection status of the exhaust gas duct 103 with the first ceramic combustion furnace 22, the second ceramic combustion furnace 23 and the third ceramic combustion furnace 24 is switched by the gas valve.

[0059] The exhaust gas enters the regenerative combustion furnace 2 from the bottom through the ceramic heat storage body 25. The heat storage and release state of the ceramic heat storage body 25 is controlled to recover the heat of the high-temperature gas generated by combustion and use it to preheat the newly entered exhaust gas.

[0060] Subsequently, the liquid, carbon dioxide, and halohydrogen produced by the combustion of exhaust gas are neutralized, with the liquid being discharged through liquid conduit 201 to chemical tank 202.

[0061] The acidic gas produced by combustion is conducted to the bottom of the absorption tower 3 through the gas conduit 302. The gas conduit 302 is fitted with a heating sleeve 34. The liquid chamber 304 formed by the heating sleeve 34 and the gas conduit 302 maintains the temperature of the gas conduit 302 within a certain range through the circulation of heating liquid, thereby reducing the condensation of acidic gas caused by sudden temperature changes during the transportation of fluorine-containing waste gas and reducing the occurrence of "ice blockage".

[0062] The sodium hydroxide solution in the chemical tank 202 is sprayed onto the packing layer 31 through the liquid sprayer 32 set at the top of the absorption tower 3. The acidic gas comes into contact with several packing holes 301 of the packing layer 31 from bottom to top, and the sodium hydroxide solution neutralizes the acidic gas from top to bottom.

[0063] The demister 33 installed at the top of the absorption tower 3 reduces the amount of unreacted sodium hydroxide solution emitted with the exhaust gas.

[0064] Finally, the exhaust is discharged through the exhaust duct and exhaust chimney 4.

[0065] Therefore, this application uses a bag filter 1 with a woven filter cloth or non-woven felt dust collection cloth 102 to remove dust particles from the exhaust gas. The exhaust gas is treated by combustion in a regenerative thermal oxidizer 2. The first ceramic oxidizer 22, the second ceramic oxidizer 23, and the third ceramic oxidizer 24 are switched via a gas valve to control the heat storage and release state of the ceramic heat storage body 25 at the bottom of the regenerative thermal oxidizer 2, recovering the heat from the high-temperature gas generated by combustion and using it to preheat newly entering exhaust gas. Simultaneously, the temperature inside the regenerative thermal oxidizer 2 is maintained stably within a specific temperature range to reduce dioxin formation. The liquid generated during combustion is directly neutralized by being transported to a chemical tank 202 via a liquid conduit 201.

[0066] Acidic gas is transported to absorption tower 3 via gas conduit 302. The acidic gas moves upward and passes through absorption tower 3 where sodium hydroxide solution is sprayed downward. Absorption tower 3 then contacts the sodium hydroxide solution through the gas-liquid countercurrent flow in the packing layer 31, facilitating the removal of residual acidic components from the combustion gas. Simultaneously, the packing layer 31 has several filling holes 301 to increase the gas-liquid reaction contact area.

[0067] The gas conduit 302 is fitted with a heating sleeve 34. The liquid chamber 304 formed by the heating sleeve 34 and the gas conduit 302 maintains the temperature of the gas conduit 302 within a certain range through circulating heating liquid, thereby reducing the condensation of acidic gas caused by sudden temperature changes during the transportation of fluorine-containing waste gas and thus reducing the occurrence of "ice blockage".

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A regenerative thermal ignition system for treating refrigerator crushing waste gas, characterized in that: It includes a bag filter (1), a regenerative thermal ignition furnace (2), and an absorption tower (3); The bag filter (1) is connected to a waste gas inlet. The bag filter (1) is connected to the bottom of the regenerative combustion furnace (2) through a waste gas duct (103). A liquid duct (201) is provided at the bottom of the regenerative combustion furnace (2). The liquid duct (201) is connected to the absorption tower (3). The bag filter (1) includes a dust removal chamber (101) and a dust removal bucket (11). The dust removal chamber (101) is provided with a dust removal cloth (102), which is a woven filter cloth or a non-woven felt. The dust removal bucket (11) is installed at the bottom of the dust removal chamber (101). The exhaust gas duct (103) is connected to the top of the dust removal bucket (11). The exhaust gas duct (103) is provided with a blower (104), which sends the exhaust gas into the regenerative combustion furnace (2). The regenerative combustion furnace (2) is connected to the bottom of the absorption tower (3) via a gas conduit (302); The absorption tower (3) is provided with a filling layer (31), and the filling layer (31) has a plurality of filling holes (301); a liquid sprayer (32) is provided on the top of the filling layer (31), and the liquid sprayer (32) is used to spray sodium hydroxide solution. The top of the absorption tower (3) is connected to an exhaust chimney (4) via an exhaust duct.

2. The regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 1, characterized in that: The regenerative combustion furnace (2) includes a common combustion furnace (21), a first ceramic combustion furnace (22), a second ceramic combustion furnace (23), and a third ceramic combustion furnace (24). The common combustion furnace (21) is connected to the first ceramic combustion furnace (22), the second ceramic combustion furnace (23), and the third ceramic combustion furnace (24). Ceramic heat storage bodies (25) are installed at the bottom of the first ceramic combustion furnace (22), the second ceramic combustion furnace (23), and the third ceramic combustion furnace (24).

3. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 1, characterized in that: The exhaust gas duct (103) is connected to a purge fan (107).

4. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 1, characterized in that: The liquid conduit (201) is connected to a medicine tank (202), which is used to contain sodium hydroxide solution, and the liquid sprayer (32) is connected to the medicine tank (202).

5. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 1, characterized in that: The absorption tower (3) is provided in several parts, and the top and bottom of the absorption tower (3) are connected in sequence by gas conduits (302).

6. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 5, characterized in that: Each of the absorption towers (3) is equipped with a demister (33) at its top.

7. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 5, characterized in that: Each of the absorption towers (3) is equipped with an exhaust gas fan (303).

8. A regenerative thermal ignition system for treating refrigerator crushing waste gas according to claim 1, characterized in that: The gas conduit (302) is fitted with a heating sleeve (34), and a liquid chamber (304) is formed between the heating sleeve (34) and the gas conduit (302), the liquid chamber (304) containing heating liquid.

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