Efficient and energy-saving deacidification device for hazardous waste incineration flue gas and process method of efficient and energy-saving deacidification device

Abstract

The invention discloses a high-efficiency energy-saving deacidification device for hazardous waste incineration flue gas and a process method thereof, and relates to the technical field of hazardous waste disposal, the high-efficiency energy-saving deacidification device comprises a washing tower, the washing tower comprises a slurry area, a flue gas inlet, an absorption area, a demisting area and a flue gas outlet; the slurry area is arranged at the bottom of the washing tower, and slurry is arranged in the slurry area; the flue gas inlet is positioned at the upper part of the slurry area; the absorption area is positioned at the upper part of the flue gas inlet and is provided with a spraying device for spraying slurry; the demisting area is positioned at the upper part of the absorption area and is provided with a multi-stage and multi-form combined efficient demister, and a deacidification agent adopts magnesium oxide. Therefore, the problem that the treatment cost is too high when hazardous waste incineration flue gas is treated based on an existing deacidification process is solved, and on the premise that it is ensured that the incineration flue gas of comprehensive hazardous waste reaches the emission standard, the system operation cost is reduced, and the investment cost of secondary dust removal equipment is saved.

Description

Technical Field

[0001] The present application relates to the technical field of hazardous waste disposal, and in particular to a highly efficient and energy-saving deacidification device for hazardous waste incineration flue gas and a process method thereof. Background Art

[0002] With the progress of our society, the economy is also developing rapidly, and industry has become the pillar industry of economic development. However, the rapid development of industry also leads to the generation of a large amount of solid waste and hazardous waste. The current treatment methods for hazardous waste mainly include chemical method, physical method, solidification treatment, biological method, marine disposal, geological disposal, incineration treatment, landfill, etc.

[0003] Incineration technology is a common method for hazardous waste treatment. After incineration, hazardous waste is decomposed by high temperature, the bacteria in it are completely eliminated, and the reduction effect is good. However, incineration will produce a large amount of high-calorie flue gas with high acid gas content, which will have adverse effects on the ecological environment, human health and production safety. There are certain differences in the current flue gas deacidification processes, but all of them have the problem of too high treatment costs, and it is impossible to reduce the system operation cost while ensuring the treatment efficiency. Summary of the invention

[0004] In order to solve the problem of excessively high treatment costs in treating hazardous waste incineration flue gas based on the existing deacidification process, and to reduce the system operating costs while ensuring that the comprehensive hazardous waste incineration flue gas meets the emission standards, the present application provides a high-efficiency and energy-saving deacidification device and process method for hazardous waste incineration flue gas.

[0005] The present application provides a highly efficient and energy-saving deacidification device for hazardous waste incineration flue gas and a process method thereof, which adopts the following technical solution.

[0006] A high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas, comprising: a washing tower, the washing tower comprising a slurry area, a flue gas inlet, an absorption area, a demisting area and a flue gas outlet;

[0007] The slurry zone is arranged at the bottom of the washing tower, slurry is arranged in the slurry zone, and a discharge hole is opened in the slurry zone of the washing tower;

[0008] The smoke inlet is located at the upper part of the slurry area;

[0009] The absorption zone is located above the flue gas inlet, and the absorption zone is provided with a spraying device for spraying slurry;

[0010] The demisting zone is located at the upper part of the absorption zone, and the demisting zone is provided with a multi-stage and multi-form combined high-efficiency demisting device.

[0011] By adopting the above technical solution, the present application only uses one washing tower to complete the flue gas deacidification treatment, the overall system structure is simple, and the operating cost is reduced.

[0012] Optionally, the slurry area is provided with an oxidizing air aeration system, and the oxidizing air aeration system includes an oxidizing blower; the slurry area is provided with a stirring device A for stirring the slurry.

[0013] By adopting the above technical solution, the setting of the oxidation fan is conducive to improving the oxidation reaction of magnesium sulfite in the slurry, accelerating the reaction speed, and generating magnesium sulfate precipitation. By setting the agitator A, the slurry can be continuously stirred to keep the solid impurities (such as magnesium sulfate) and unreacted magnesium oxide and magnesium hydroxide in the slurry area in a suspended state to avoid sinking to the bottom.

[0014] Optionally, a pulping device is provided outside the washing tower, and the pulping device is used to make slurry and transport the slurry to the slurry area;

[0015] The pulping device includes a pulping tank, in which a stirring device B is arranged. The slurry in the pulping tank is transported to the slurry area by a slurry pump. A powder silo for storing powder is arranged above the pulping tank, and a discharger, a weighing feeder, an electric valve, a flow meter and a silo fluidizer are arranged at the bottom of the powder silo.

[0016] By adopting the above technical solution and setting up a pulping device, slurry can be provided to the washing tower, thereby realizing the supply of slurry in the slurry zone.

[0017] Optionally, the spray device includes a spray pipe arranged in the washing tower, the spray pipe is provided with spray holes, and a spray pump pumps slurry from the slurry area to the spray pipe.

[0018] By adopting the above technical solution and setting up a spray device, the slurry is atomized and sprayed into the absorption area in the washing tower, fully mixed with the flue gas, reacted with the acidic substances in the flue gas, and the acidic substances are removed.

[0019] Optionally, the multi-stage multi-form combined high-efficiency demister is provided with four stages, including a first-stage tubular demister, a second-stage wide-spacing C-shaped ridge demister, a third-stage narrow-spacing C-shaped ridge demister, and a fourth-stage narrow-spacing S-shaped ridge demister;

[0020] The multi-stage, multi-form combined high-efficiency demister also includes a demister bracket, which includes three bracket beams that are spaced apart in the washing tower from top to bottom, a four-stage narrow-pitch S-shaped ridge demister is arranged on the top bracket beam, a three-stage narrow-pitch C-shaped ridge demister is arranged on the middle bracket beam, a two-stage wide-pitch C-shaped ridge demister is arranged on the bottom bracket beam, an inverted hanging frame is arranged at the bottom of the two-stage wide-pitch C-shaped ridge demister, and a first-stage tubular demister is hung on the inverted hanging frame.

[0021] By adopting the above technical scheme, the multi-stage multi-form combined high-efficiency demister adopts a four-stage structure, which is respectively a first-stage tubular type, which uses the characteristics of the tubular demister that is not easy to be blocked to remove about 80% of the deacidification slurry carried by the flue gas; the second stage adopts a wide-spacing C-shaped ridge demister to further remove about 15% of the droplets carried by the flue gas; the third stage adopts a narrow-spacing C-shaped ridge demister to enhance the demisting effect; the fourth stage adopts a narrow-spacing S-shaped ridge demister with a filter groove, which removes the clean droplets newly generated by collision in the flue gas on the basis of basically removing the deacidification slurry carried by the flue gas, so that the soluble salts in the flue gas are also removed. The four-stage demisters work together as a collaborative dust removal equipment for the deacidification system, so that the dust in the flue gas emission index also meets the emission requirements.

[0022] Optionally, the demisting area is further provided with a flushing water device for flushing the multi-stage multi-form combined high-efficiency defogger, the flushing water device comprising a flushing water pipe arranged in the demisting area of ​​the washing tower, and a flushing hole is opened on the flushing water pipe;

[0023] The head end of the flushing water pipe is connected to the external water pipe through a water pipe interface, the water pipe interface includes a tower wall pipe outside the washing tower, the flushing water pipe is located in the tower wall pipe, and the head end of the flushing water pipe extends out of the tower wall pipe, the external water pipe, the flushing water pipe, and the tower wall pipe are fixedly connected by flanges, rubber pads and bolts, and the external water pipe is pumped with flushing water by a flushing pump;

[0024] The flushing water device also includes a water tank, and the flushing pump supplies water from the water tank to the flushing water pipe. The flushing water device also includes a radiator and a cooling pump, and the cooling pump is used to pump the flushing water in the water tank to the radiator for cooling.

[0025] By adopting the above technical solution and setting up a flushing water device, the flushing hole can spray cleaning water to flush the dust collector, thereby facilitating the maintenance and cleaning of the dust collector, avoiding the accumulation of a large amount of impurities or even blockage, and maintaining the normal operation of the dust collector.

[0026] A highly efficient and energy-saving deacidification process for hazardous waste incineration flue gas, which uses the highly efficient and energy-saving deacidification device for hazardous waste incineration flue gas described above, and the deacidification process specifically includes:

[0027] Step 1, prepare slurry by pulping device, powder material is stored in powder bin, the powder material includes magnesium oxide powder, the powder bin is measured by discharger and weighing feeder, and then sent to pulping tank by silo fluidizer, the water amount in water inlet pulping tank is controlled by electric valve and flowmeter, and with the action of stirring device B, magnesium oxide powder and water are made into 10-15% magnesium oxide slurry for standby use, and the prepared slurry is transported to slurry area of ​​washing tower;

[0028] Step 2: Connect the flue gas from the flue gas inlet to the scrubbing tower;

[0029] Step 3: The flue gas enters the absorption zone, the spray layer sprays the slurry, the spray pump starts, the slurry is sent to the spray pipe, and the atomized slurry is sprayed from the spray hole into the scrubbing tower to contact the flue gas;

[0030] Step 4: The flue gas enters the demisting area and is demisted by a multi-stage, multi-form combined high-efficiency demister;

[0031] Step 5: The smoke after defog is discharged from the smoke outlet.

[0032] By adopting the above technical solution, the flue gas enters the washing tower from the flue gas inlet, and the flue gas can be deacidified after spraying, dust removal and demisting. The deacidification process is efficient and energy-saving, shortens the deacidification process, and reduces the cost of the treatment process.

[0033] Optionally, the slurry zone is aerated by an oxidizing air aeration system to oxidize the generated magnesium sulfite into magnesium sulfate.

[0034] By adopting the above technical solution, the setting of the oxidizing air aeration system can accelerate the oxidation rate of magnesium sulfite, which is beneficial to increase the reaction rate and accelerate the precipitation of magnesium sulfate solid precipitate.

[0035] Optionally, the stirring device A stirs the slurry to keep the solid impurities and the incompletely reacted magnesium oxide and magnesium hydroxide in the slurry region in a suspended state.

[0036] By adopting the above technical solution and setting the stirring device A, the slurry in the slurry area and the slurry that falls into the slurry area after reacting with the flue gas can be stirred, so that the substances in the slurry are kept separated, which is convenient for the separation of different substances and the reuse of magnesium oxide and magnesium hydroxide.

[0037] Optionally, the atomized slurry contacts and reacts with the flue gas, and the slurry is atomized into small particles, which contact the flue gas to remove acidic substances in the flue gas.

[0038] By adopting the above technical solution, the atomized slurry is dispersed more evenly, increasing the contact with the flue gas, and can fully contact and react with the flue gas to remove the acidic substances in the flue gas. The contact time between the slurry and the flue gas is not less than four seconds.

[0039] In summary, this application at least includes the following beneficial effects:

[0040] The present application has a simple structure, is easy to operate, is economical and efficient, and is energy-saving and environmentally friendly. It can not only dynamically adjust the addition rate of the deacidification agent to make the deacidification efficiency of hydrogen chloride, sulfur dioxide, and hydrogen fluoride above 95%, ensuring that the flue gas meets the emission standards, but also achieve ultra-low emissions of dust at the outlet of the scrubber. Different from the traditional wet deacidification, the present invention uses a lower-priced absorbent, which greatly saves the operating cost of the absorbent. It not only ensures that the flue gas meets the emission standards, but also reduces the operating cost of the deacidification agent. The design of the entire system fully considers the concept of energy conservation and environmental protection, greatly reducing the investment and production and operation costs of the flue gas purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of a high-efficiency and energy-saving deacidification device for flue gas from hazardous waste incineration.

[0043] Figure 2 It is a schematic diagram of a highly efficient and energy-saving deacidification process method for hazardous waste incineration flue gas.

[0044] Figure 3 It is a schematic diagram of a pulping device.

[0045] Figure 4 It is a schematic diagram of the emergency cooling system.

[0046] Figure 5 This is a schematic diagram of a scrubber.

[0047] Figure 6 It is a schematic diagram of the defogging area.

[0048] Figure 7 It is a schematic diagram of the plan layout of a first-stage tubular demister.

[0049] Figure 8 It is a schematic diagram of the plan layout of a two-stage wide-spaced rectangular C-shaped ridge-type demister.

[0050] Fig. 9 It is a schematic diagram of the plan layout of a three-stage narrow-space rectangular C-shaped roof ridge demister.

[0051] Fig.10 It is a schematic diagram of the plan layout of a four-stage narrow-spaced rectangular S-shaped roof ridge demister.

[0052] Fig.11 This is a schematic diagram of the plan layout of flushing water pipes.

[0053] Fig.12 This is a schematic diagram of the flushing water pipe interface.

[0054] Explanation of the reference numerals: 1. slurry area; 2. flue gas inlet; 3. absorption area; 4. demisting area; 5. flue gas outlet; 6. pulping tank; 7. stirring device B; 8. powder silo; 9. oxidizing air aeration system; 10. stirring device A; 11. discharge pump; 12. spraying device; 13. multi-stage multi-form combined high-efficiency demister; 14. first-stage tubular demister; 15. second-stage wide-spacing C-shaped ridge demister; 16. third-stage narrow-spacing C-shaped ridge demister; 17. fourth-stage narrow-spacing S-shaped ridge demister; 18. support beam; 19. inverted hanger; 20. flushing water device; 21. flushing water pipe; 22. external water pipe; 23. tower wall pipe; 24. rubber pad. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The following is combined with Figures 1 to 12 This application is described in further detail.

[0057] The embodiment of the present application discloses a highly efficient and energy-saving deacidification device and a process method for hazardous waste incineration flue gas.

[0058] Reference Figures 1 to 12 , a high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas, comprising:

[0059] The washing tower comprises a slurry zone 1, a flue gas inlet 2, an absorption zone 3, a demisting zone 4 and a flue gas outlet 5.

[0060] The slurry zone 1 is arranged at the bottom of the washing tower.

[0061] The washing tower is connected to a pulping device, which is used to make slurry and transport the slurry to the slurry area 1. The pulping device includes a pulping tank 6, in which a stirring device B7 is provided. The stirring device B7 includes a stirrer B, which is a paddle stirrer. The slurry in the pulping tank 6 is transported to the slurry area 1 through a slurry pump. A powder bin 8 for storing powder is provided above the pulping tank 6, and a discharger, a weighing feeder, an electric valve, a flow meter and a silo fluidizer are provided at the bottom of the powder bin 8. Through the setting of the pulping device, slurry can be provided to the washing tower, and the supply of slurry in the slurry area 1 can be realized.

[0062] The silo fluidizer includes a fan, an electric heater, an air pipe and a gasification plate. The airflow blown by the fan is connected to the gasification plate through the air pipe, and the heater is installed on the air pipe to heat the airflow in the air pipe. When in use, the airflow can be heated to more than 60 degrees. The heated airflow is blown out through the gasification plate. The gasification plate is installed above the opening of the silo. The gasification plate is connected to the heated airflow to fluidize the powder and granular materials, increase the flowability of the powder, make the unloading smooth, and ensure the uniform discharge of the powder.

[0063] The slurry area 1 is provided with an oxidation air aeration system 9, and the oxidation air aeration system 9 includes an oxidation blower.

[0064] A stirring device A10 for stirring the slurry is provided in the slurry area 1. The stirring device A10 includes a stirrer A, which is a paddle stirrer or a pulse suspension pump, both of which are used for stirring. Through the setting of the stirrer A, the slurry can be continuously stirred.

[0065] The slurry area 1 of the washing tower is provided with a discharge hole, to which a discharge pump 11 is connected. The discharge pump 11 is provided to facilitate the discharge of the slurry (magnesium sulfate solution after deacidification, containing fixed impurities) in the slurry area 1.

[0066] The flue gas inlet 2 is located at the upper part of the slurry area 1. The flue gas flows from bottom to top. An emergency cooling system is installed at the flue gas inlet 2. When the circulating pump loses power, in order to prevent the internal parts of the tower from being damaged by overheating, the cooling water solenoid valve is opened by UPS power supply, and the flue gas entering the tower is cooled by spraying industrial water to protect the internal parts of the tower from being damaged by high temperature.

[0067] The absorption zone 3 is located above the flue gas inlet 2. The absorption zone 3 is provided with a spray device 12 for spraying slurry. The slurry is sprayed from top to bottom. The spray device 12 includes a spray pipe arranged in the washing tower. The spray pipe is provided with multiple layers above and below. Spray holes are opened on the spray pipe. The spray pump pumps the slurry from the slurry zone 1 to the spray pipe. Through the setting of the spray device 12, the slurry is atomized and sprayed into the absorption zone 3 in the washing tower, fully mixed with the flue gas, reacted with the acidic substances in the flue gas, and removed the acidic substances.

[0068] The demisting area 4 is located above the absorption area 3. The demisting area 4 is provided with a multi-stage and multi-form combined high-efficiency demister 13. The flue gas after deacidification still contains moisture, and the moisture also contains sulfate, unreacted impurities in magnesium oxide powder, etc., so the flue gas after deacidification needs to be demisted to ensure the treatment effect of the flue gas.

[0069] The multi-stage multi-form combined high-efficiency demister 13 is provided with four stages, including, from bottom to top, a first-stage tubular demister 14, a second-stage wide-spacing C-shaped ridge demister 15, a third-stage narrow-spacing C-shaped ridge demister 16 and a fourth-stage narrow-spacing S-shaped ridge demister 17, with each stage spaced 1-1.5 m apart from top to bottom.

[0070] The multi-stage and multi-form combined high-efficiency demister 13 includes a demister bracket, which is fixed in the washing tower. The demister bracket includes three bracket beams 18 spaced apart from each other. The four-stage narrow-pitch S-shaped ridge demister is placed on the top bracket beam 18 and fixed to the bracket beam 18 by bolts. The three-stage narrow-pitch C-shaped ridge demister is placed on the middle bracket beam 18 and fixed to the bracket beam 18 by bolts. The two-stage wide-pitch C-shaped ridge demister is placed on the bottom bracket beam 18 and fixed to the bracket beam 18 by bolts. An inverted bracket 19 is provided at the bottom of the two-stage wide-pitch C-shaped ridge demister, and the first-stage tubular demister 14 is hung on the inverted bracket 19.

[0071] The multi-stage and multi-form combined high-efficiency demister 13 adopts a four-stage structure, which includes a first-stage tubular demister 14, which utilizes the characteristic of the tubular demister that it is not easy to clog to remove about 80% of the deacidified slurry carried away by the flue gas; the second-stage adopts a wide-spacing C-shaped ridge demister to further remove about 15% of the droplets carried by the flue gas; the third-stage adopts a narrow-spacing C-shaped ridge demister to enhance the demisting effect; the fourth-stage adopts a narrow-spacing S-shaped ridge demister with a filter groove, which, on the basis of basically removing the deacidified slurry carried by the flue gas, simultaneously removes the clean droplets newly generated by collision in the flue gas, so that the soluble salts in the flue gas are also removed. The four-stage mist eliminators work together to remove dirt from the flue gas in turn. As a collaborative dust removal device for the deacidification system, and as a collaborative dust removal component for the deacidification system, the dust in the flue gas can directly reach the ultra-low emission effect required by the environmental protection department, replacing the traditional process of setting a wet electrostatic precipitator as a secondary dust removal after deacidification to achieve the ultra-low emission requirements of dust.

[0072] The demisting area 4 is also provided with a flushing water device 20, which includes a flushing water pipe 21 arranged in the demisting area 4 in the washing tower. A flushing hole is opened on the flushing water pipe 21, and an atomizing nozzle is installed on the flushing hole. The head end of the flushing water pipe 21 is connected to the external water pipe 22 through a water pipe interface. The water pipe interface includes a tower wall pipe 23 outside the washing tower. A flange is set at the end of the tower wall pipe 23. The flushing water pipe 21 is located in the tower wall pipe 23. The head end of the flushing water pipe 21 extends out of the flange of the tower wall pipe 23. The end of the external water pipe 22 connected to the flushing pump is a flange. The external water pipe 22, the flushing water pipe 21, and the tower wall pipe 23 are fixedly connected by flanges, rubber pads 24 and bolts. The flushing water pipe 21 is connected to the external water pipe 22, and flushing water is pumped by the flushing pump.

[0073] There are three groups of flushing water pipes 21, which are used for flushing the two-stage wide-spacing C-shaped ridge demister 15, the three-stage narrow-spacing C-shaped ridge demister 16 and the four-stage narrow-spacing S-shaped ridge demister 17. The flushing water device 20 also includes a water tank, and a flushing pump supplies water from the water tank to the flushing water pipes 21. The flushing water device also includes a radiator and a cooling pump. The cooling pump is used to pump the flushing water in the water tank to the radiator for cooling. Through the setting of the flushing water device 20, the atomizing nozzle can spray cleaning water to flush the multi-stage multi-form combined high-efficiency demister, which is convenient for the maintenance and cleaning of the multi-stage multi-form combined high-efficiency demister 13, avoids the accumulation of a large amount of impurities or even blockage, and maintains the normal operation of the demister.

[0074] Reference Figures 1 to 12 , a highly efficient and energy-saving deacidification process for hazardous waste incineration flue gas, specifically comprising:

[0075] Step 1: Prepare slurry through a slurry making device, and transport the prepared slurry to the slurry zone 1 of the washing tower.

[0076] The magnesium oxide powder is transported to the site by a tank truck, and the pneumatic conveying equipment of the tank truck delivers the magnesium oxide powder to the powder bin on site. After being measured by the star-shaped discharger and the weighing feeder at the bottom of the powder bin 8, the powder is delivered to the pulping tank 6 by the silo fluidizer. The powder bin 8 is connected to compressed air, and the silo fluidizer is used to fluidize the powder to ensure that no lumps fall. The amount of water in the water inlet pulping tank 6 is controlled by an electric valve and a flow meter. With the action of the stirring device B7, the magnesium oxide powder and water are made into a 10-15% magnesium oxide slurry for standby use as a deacidifying agent, and the prepared slurry is transported to the slurry area 1 of the washing tower.

[0077] Step 2: Connect the flue gas from the flue gas inlet 2 to the scrubbing tower, and the flue gas diffuses upward from bottom to top. The flue gas contains acidic substances such as hydrogen chloride, sulfur dioxide, and hydrogen fluoride.

[0078] Step 3: The flue gas diffuses upward into the absorption zone 3, and the spray layer sprays the slurry. The spray liquid sprays from top to bottom. The spray pump starts to send the slurry to the spray pipe, and the atomized slurry is sprayed from the spray hole into the scrubber to contact the flue gas. The contact time between the slurry and the flue gas is not less than four seconds to ensure that pollutants such as sulfur dioxide and hydrogen chloride in the flue gas fully react with the magnesium oxide in the spray slurry.

[0079] The atomized slurry reacts with the flue gas, and the slurry is atomized into small particles, which come into contact with the flue gas to remove the acidic substances in the flue gas. The atomized slurry is dispersed more evenly, increasing the contact with the flue gas, and can fully contact and react with the flue gas to remove the acidic substances in the flue gas.

[0080] Step 4: The flue gas enters the demisting area 4 and is demisted by the multi-stage and multi-form combined high-efficiency demister 13.

[0081] Design parameters of multi-stage and multi-form combined high-efficiency mist eliminator 13:

[0082] Demister material: reinforced polypropylene, nozzle material: PP;

[0083] Blade spacing:

[0084] Secondary wide rectangular C-shaped ridge demister 15: 20 to 30 mm,

[0085] Three-stage narrow rectangular C-shaped roof ridge demister 16: 21 to 27.5 mm,

[0086] Four-stage narrow-spaced S-shaped roof ridge demister 17: 22 to 25.4 mm;

[0087] Installation space: 5000mm;

[0088] Demister pressure drop: 300Pa;

[0089] Blade thickness: 3mm;

[0090] Number of nozzles per layer: 56;

[0091] Nozzle flow: 1.68 cubic meters per hour;

[0092] Flushing water pressure: 2Br;

[0093] Maximum flushing water volume: 47.04 cubic meters per hour;

[0094] Average flushing water volume: 7.16 cubic meters per hour;

[0095] Recommended flushing procedures:

[0096] Second-stage wide-spacing C-shaped ridge defogger 15 upward flushing: 1min to 30min, second-stage wide-spacing C-shaped ridge defogger 15 upward flushing: 1min to 60min, third-stage narrow-spacing C-shaped ridge defogger 16 upward flushing: 1min to 90min, third-stage narrow-spacing C-shaped ridge defogger 16 upward flushing: 1min to 120min, fourth-stage narrow-spacing S-shaped ridge defogger 17 upward flushing: 1min to 150min, fourth-stage narrow-spacing S-shaped ridge defogger 17 upward flushing: manual flushing (the flushing time can be adjusted according to actual working conditions).

[0097] Step 5: The smoke after defog is discharged from the smoke outlet 5.

[0098] The spray hole sprays out atomized slurry, which contains magnesium oxide and magnesium hydroxide. After reacting with the acidic substances in the flue gas, it becomes a spray liquid after reaction. The spray liquid contains soluble magnesium salts such as magnesium chloride, magnesium fluoride and magnesium sulfite. The spray liquid after reaction falls into the slurry area 1.

[0099] The slurry area 1 aerates the slurry (including the spray liquid after the reaction) through the oxidation wind aeration system 9 to oxidize the generated magnesium sulfite into magnesium sulfate. The setting of the oxidation wind aeration system 9 can accelerate the oxidation rate of magnesium sulfite, which is conducive to increasing the reaction rate and accelerating the precipitation of magnesium sulfate solid precipitate. The spray liquid is separated into solid and liquid in the slurry area 1 to obtain a concentrated slurry and a clarified liquid, and the concentrated slurry is discharged through the discharge hole.

[0100] The stirring device A10 stirs the slurry to keep the solid impurities and the unreacted magnesium oxide and magnesium hydroxide in the slurry area 1 in a suspended state. By setting the stirring device A10, the slurry in the slurry area 1 and the slurry that falls into the slurry area 1 after reacting with the flue gas can be stirred to keep the substances in the slurry separated, and the solid impurities (such as magnesium sulfate) and the unreacted magnesium oxide and magnesium hydroxide in the slurry area are kept in a suspended state, which is convenient for the separation of different substances and the reuse of magnesium oxide and magnesium hydroxide.

[0101] The flue gas enters the scrubbing tower from the flue gas inlet 2, and the flue gas can be deacidified through spraying, dust removal and mist removal. Only one scrubbing tower is needed to achieve standard emission of acid and dust. The deacidification process is efficient and energy-saving, shortens the deacidification process and reduces the cost of the process.

[0102] The present invention has a simple structure, is easy to operate, is economical and efficient, and is energy-saving and environmentally friendly. It can not only dynamically adjust the addition rate of the deacidification agent to make the deacidification efficiency of hydrogen chloride, sulfur dioxide, and hydrogen fluoride above 95%, ensuring that the flue gas meets the emission standards, but also achieve ultra-low emissions of dust at the outlet of the deacidification tower. Different from the traditional wet deacidification, the present invention adopts a lower-priced absorbent, which greatly saves the operating cost of the absorbent. It not only ensures that the flue gas meets the emission standards, but also reduces the operating cost of the deacidification agent. The design of the entire system fully considers the concept of energy conservation and environmental protection, greatly reducing the investment and production and operation costs of the flue gas purification system.

[0103] Embodiment 1

[0104] The incinerator of a hazardous waste disposal company has a disposal capacity of 100 tons / day and a flue gas volume of 32000Nm 3 / H, sulfur dioxide concentration is about 3500mg / Nm 3 , hydrogen chloride concentration is about 4000mg / Nm 3 The original process used caustic soda for deacidification, and the cost of deacidification alkali liquid per ton of hazardous waste was about 150 yuan. After adopting this process, the cost of deacidification agent was reduced by about 100 yuan, and the sulfur dioxide concentration in the flue gas after treatment was less than or equal to 10mg / Nm 3 , the concentration of hydrogen chloride is less than or equal to 5mg / Nm 3 The performance is equal to or better than the conventional caustic soda deacidification process in the industry, and the comprehensive cost of deacidification is reduced by more than 50%. At the same time, the multi-stage and multi-form combined high-efficiency mist eliminator of the deacidification system cooperates with dust removal, so that the flue gas directly meets the ultra-low emission requirements of less than or equal to 10mg / Nm3 set by the environmental protection department, replacing the wet electrostatic precipitator installed after the scrubber, further reducing environmental protection investment and operating costs.

[0105] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "bottom", "top", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0106] The above are only preferred embodiments of the invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. A highly efficient and energy-saving deacidification device for hazardous waste incineration flue gas, characterized in that: include: A scrubbing tower, the scrubbing tower comprising a slurry zone (1), a flue gas inlet (2), an absorption zone (3), a demisting zone (4) and a flue gas outlet (5); The slurry zone (1) is arranged at the bottom of the washing tower, slurry is arranged in the slurry zone (1), and the slurry zone (1) of the washing tower is provided with a discharge hole; The smoke inlet (2) is located at the upper part of the slurry area (1); The absorption zone (3) is located above the flue gas inlet (2), and the absorption zone (3) is provided with a spraying device (12) for spraying slurry; The demisting area (4) is located above the absorption area (3), and the demisting area (4) is provided with a multi-stage, multi-form combined high-efficiency demisting device (13).

2. The high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas according to claim 1, characterized in that: The slurry area (1) is provided with an oxidizing air aeration system (9), and the oxidizing air aeration system (9) comprises an oxidizing air blower; the slurry area (1) is provided with a stirring device A (10) for stirring the slurry.

3. The high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas according to claim 1 is characterized in that: A pulping device is provided outside the washing tower, and the pulping device is used to prepare slurry and transport the slurry to the slurry area (1); The pulping device comprises a pulping tank (6), wherein a stirring device B (7) is arranged in the pulping tank (6), the slurry in the pulping tank (6) is transported to the slurry area (1) by a slurry pump, a powder silo (8) for storing powder is arranged above the pulping tank (6), and a discharger, a weighing feeder, an electric valve, a flow meter and a silo fluidizer are arranged at the bottom of the powder silo (8).

4. The high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas according to claim 1, characterized in that: The spray device (12) comprises a spray pipe arranged in the washing tower, the spray pipe is provided with spray holes, and a spray pump pumps slurry from the slurry area (1) to the spray pipe.

5. The high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas according to claim 1, characterized in that: The multi-stage multi-form combined high-efficiency demister (13) is provided with four stages, including a first-stage tubular demister (14), a second-stage wide-spacing C-shaped ridge demister (15), a third-stage narrow-spacing C-shaped ridge demister (16), and a fourth-stage narrow-spacing S-shaped ridge demister (17); The multi-stage multi-form combined high-efficiency demister (13) also includes a demister bracket, wherein the demister bracket includes three bracket beams (18) arranged in a wash tower at intervals in the upper and lower directions, a four-stage narrow-pitch S-shaped ridge demister arranged on the uppermost bracket beam (18), a three-stage narrow-pitch C-shaped ridge demister arranged on the middle bracket beam (18), a two-stage wide-pitch C-shaped ridge demister arranged on the lowermost bracket beam (18), an inverted hanging frame (19) is arranged at the bottom of the two-stage wide-pitch C-shaped ridge demister, and the first-stage tubular demister (14) is hung on the inverted hanging frame (19).

6. The high-efficiency and energy-saving deacidification device for hazardous waste incineration flue gas according to claim 1, characterized in that: The demisting area (4) is also provided with a flushing water device (20) for flushing the multi-stage multi-form combined high-efficiency demister (13), the flushing water device (20) comprising a flushing water pipe (21) arranged in the demisting area (4) in the washing tower, and a flushing hole is opened on the flushing water pipe (21); The head end of the flushing water pipe (21) is connected to the external water pipe (22) through a water pipe interface, the water pipe interface includes a tower wall pipe (23) outside the washing tower, the flushing water pipe (21) is located in the tower wall pipe (23), and the head end of the flushing water pipe (21) extends out of the tower wall pipe (23), the external water pipe (22), the flushing water pipe (21), and the tower wall pipe (23) are fixedly connected through a flange, a rubber pad (24) and bolts, and the external water pipe (22) is pumped with flushing water by a flushing pump; The flushing water device (20) further comprises a water tank, the flushing pump supplies water from the water tank to the flushing water pipe (21), and the flushing water device (20) further comprises a radiator and a cooling pump, the cooling pump being used to pump the flushing water in the water tank to the radiator for cooling.

7. A highly efficient and energy-saving deacidification process for hazardous waste incineration flue gas, characterized in that: A highly efficient and energy-saving deacidification device for hazardous waste incineration flue gas as claimed in any one of claims 1 to 6 is used, and the deacidification process specifically comprises: Step 1, a slurry is prepared by a slurry making device, a powder bin (8) is stored with powder material, the powder material includes magnesium oxide powder, the powder bin (8) is metered by a discharger and a weighing feeder, and then sent to a slurry making tank (6) by a silo fluidizer, an electric valve and a flow meter are used to control the amount of water in the water inlet slurry making tank (6), and a stirring device B (7) is used to make a 10-15% magnesium oxide slurry with magnesium oxide powder and water for standby use, and the prepared slurry is transported to a slurry area (1) of a washing tower; Step 2: Connect the flue gas from the flue gas inlet (2) to the scrubbing tower; Step 3: The flue gas enters the absorption zone (3), the spray layer sprays the slurry, the spray pump starts, and the slurry is sent to the spray pipe, and the atomized slurry is sprayed from the spray hole into the scrubbing tower to contact the flue gas; Step 4: The smoke enters the demisting area (4) and is demisted by a multi-stage, multi-form combined high-efficiency demister (13); Step 5: The smoke after defogger is discharged from the smoke outlet (5).

8. The high-efficiency and energy-saving deacidification process for hazardous waste incineration flue gas according to claim 7, characterized in that: The slurry area (1) is aerated by an oxidizing air aeration system (9) to oxidize the generated magnesium sulfite into magnesium sulfate.

9. The high-efficiency and energy-saving deacidification process for hazardous waste incineration flue gas according to claim 7, characterized in that: The stirring device A (10) stirs the slurry to keep the solid impurities and the unreacted magnesium oxide and magnesium hydroxide in the slurry area (1) in a suspended state.

10. The high-efficiency and energy-saving deacidification process for hazardous waste incineration flue gas according to claim 7, characterized in that: The atomized slurry reacts when in contact with the flue gas. The slurry is atomized into small particles and comes into contact with the flue gas to remove acidic substances in the flue gas. The contact time between the slurry and the flue gas is not less than four seconds.

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