A flue gas purification device for absorbing, capturing and solidifying multiple pollutants in flue gas

Abstract

The present invention provides a flue gas purification device for adsorbing and capturing multiple pollutants in solidified flue gas, which effectively solves the technical problems of large floor space, large investment, high operating cost and complicated operation of traditional devices. It includes a flue gas reaction zone A, a flue gas purification zone B, a solid waste recovery zone C and a liquid preparation zone D. A flue gas inlet is installed at the lower end of the flue gas reaction zone A, and a rotary atomizer and a cyclone filter are installed inside. Cyclone filter 2 and a ceramic membrane filter plate are installed in the flue gas purification zone B, and a purified gas outlet is installed at the upper end. A solid waste recovery bin is installed at the upper end of the solid waste recovery zone C, and a screw conveyor is installed at the lower end. The liquid preparation zone D is equipped with an adsorption liquid tank, a stirrer, an infusion pump and an infusion pipeline; the infusion pump is connected to the two rotary atomizers of the flue gas reaction zone A. The present invention has the advantages of short construction period, small floor space, low cost, no three waste emissions, good flue gas purification effect, easy disassembly, assembly and maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification, and in particular to a flue gas purification device for absorbing, capturing and solidifying multiple pollutants in flue gas. Background Art

[0002] With the rapid development of my country's economy, air pollution control has become a key issue in my country. With the tightening of environmental protection and technological progress, in addition to PM, NOx and SOx, the removal of unconventional pollutants also needs to be solved urgently, which brings greater challenges to post-processing technology.

[0003] For many years, most of the flue gas pollution control at home and abroad adopts the operation mode of three sets of equipment for desulfurization, denitrification and dust removal. According to different principles, it is divided into two categories: dry method and wet method. Among them, the dry method includes catalytic reduction method, catalytic decomposition method, electron beam irradiation method and adsorption method; the wet method includes alkali absorption method, adsorption method, catalytic conversion method, biological method and plasma method, such as limestone / lime-gypsum method, bag dust removal + double alkali desulfurization and other treatment processes, furnace DSNCR denitrification + water spray + electric tar collector + lime-gypsum desulfurization + wet electrostatic precipitator, SCR denitrification + bag dust removal + lime-gypsum desulfurization + wet electrostatic precipitator. These processes require three sets of equipment for desulfurization, denitrification and dust removal. These processes not only occupy a large area, have large investment and high operating costs, but also have complex structures and cumbersome operations. In particular, the high water consumption and the difficulty in handling the generated chemical materials or sludge are difficult, and there are problems such as ammonia leakage, equipment corrosion, structural wear and scaling.

[0004] On this basis, the present invention provides a new device and method to solve this problem. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a flue gas purification device for adsorbing, capturing and solidifying multiple pollutants in flue gas, which effectively solves the technical problems of the prior art such as large equipment footprint, large investment, high operating cost, complex structure and cumbersome operation.

[0006] A flue gas purification device for absorbing, capturing and solidifying multiple pollutants in flue gas, characterized in that it comprises: a flue gas reaction zone A, a flue gas purification zone B, a solid waste recovery zone C and a liquid preparation zone D.

[0007] The flue gas reaction zone A includes a flue gas inlet and a rotary atomizer 1, a cyclone filter 1, and a rotary atomizer 2. The upper end of the flue gas reaction zone A is connected to the flue gas purification zone B, and the lower end is connected to the solid waste recovery zone C.

[0008] The flue gas purification zone B includes a cyclone filter 2, a ceramic membrane filter plate and a purified gas outlet which are installed in sequence from bottom to top. The lower end of the flue gas purification zone B is connected to the flue gas reaction zone A.

[0009] The solid waste recovery area C includes solid waste recovery bins installed from top to bottom and a screw conveyor connected at the lower end. The upper end of the solid waste recovery area C is connected to the flue gas reaction area A.

[0010] The liquid preparation area D includes an adsorption liquid tank, an agitator and an infusion pump installed in sequence; the adsorption liquid tank is equipped with an infusion pump and an infusion pipeline, the infusion pipeline pump connects the rotary atomizer 1 and the rotary atomizer 2, and the adsorption liquid is stored in the adsorption liquid tank.

[0011] Preferably, the preparation steps of the adsorption liquid are:

[0012] 1) Modified humic acid. 100 parts of lignite crushed to 0.3 mm were weighed and put into a reactor, and water vapor was introduced and stirred for activation treatment. The temperature was controlled at 150-200°C and the activation treatment was carried out for 40 minutes, so that the lignite particles were filled with water to complete the lignite activation process; then 50 parts of 10% sodium hydroxide liquid were added for sodiumization reaction, and the reaction was completed after stirring for 30 minutes, and then the modified humic acid was formed after being dried by superheated steam;

[0013] 2) Nano catalyst. Weigh 70 parts of nano magnesium oxide, 15 parts of calcium hypochlorite, and 15 parts of potassium permanganate and mix them evenly to form a strong base catalyst;

[0014] 3) Viscous adsorbent. Mix 85 parts of cassava flour, 5 parts of oxidase and 10 parts of sodium carbonate to form a viscous adsorbent;

[0015] 4) Flue gas purification material: 60 parts of modified humic acid, 25 parts of nano catalyst and 15 parts of viscous adsorbent were uniformly mixed to obtain a flue gas purification material.

[0016] 5) The flue gas purification material is made into a 5% aqueous solution according to the ratio, which is the adsorption liquid.

[0017] The flue gas purification material and aqueous solution adsorption liquid of the present invention are used for purifying multiple pollutants in flue gas. Through the processes of atomization wetting, condensation, oxidation catalysis, reduction reaction, sedimentation, filtration, separation and filtration, the flue gas is purified to meet the emission standards, and the smoke particles are condensed and solidified into pollutant particles for recycling; thereby achieving the purpose of integrated desulfurization, denitrification, decarbonization, dust removal and demisting.

[0018] The flue gas purification device of the present invention adopts a modular assembly into a cylindrical tower technical solution, integrating desulfurization, denitrification, decarbonization, dust removal and mist removal. It has the advantages of short construction period, small footprint, low cost, low operation and maintenance cost, no three wastes discharge, no secondary pollution, no scaling and clogging of the system, good flue gas purification effect, easy transportation, disassembly, assembly and maintenance, and easy upgrading and transformation of the existing flue gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall internal structure installation of the present invention.

[0020] Reference numerals:

[0021] The flue gas reaction zone A includes: 1. flue gas inlet, 2. rotary atomizer 1, 3. cyclone filter 1, 4. rotary atomizer 2;

[0022] The flue gas purification zone B includes: 5. Cyclone filter 2; 6. Ceramic membrane filter plate; 7. Purified gas outlet;

[0023] Solid waste recycling area C includes: 8. solid waste recycling bin, 9. screw conveyor;

[0024] The liquid preparation area D includes: 10. adsorption liquid tank, 11. agitator, 12. infusion pump, and 13. infusion pipeline. DETAILED DESCRIPTION

[0025] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0026] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0027] The present invention adopts a modular tower assembly structure, which mainly includes a flue gas reaction zone A, a flue gas purification zone B, a solid waste recovery zone C, and a liquid preparation zone D. The corresponding device is installed in each zone of the modular tower body, and then the three zones of the flue gas reaction zone A, the flue gas purification zone B, and the solid waste recovery zone C are assembled and connected for operation. The liquid preparation zone D is installed next to the tower body, and a liquid delivery pipeline 13 is provided from the liquid preparation zone D to the rotary atomizer 1 2 and the rotary atomizer 2 4 in the flue gas reaction zone A.

[0028] The flue gas reaction zone A includes a flue gas inlet 1, a rotary atomizer 2, a cyclone filter 3, and a rotary atomizer 4. The upper end of the flue gas reaction zone A is connected to the flue gas purification zone B, and the lower end is connected to the solid waste recovery zone C.

[0029] The flue gas purification zone B includes a cyclone filter 5, a ceramic membrane filter plate 6 and a purified gas outlet 7 installed in sequence from bottom to top, and the lower end of the flue gas purification zone B is connected to the flue gas reaction zone A.

[0030] The solid waste recovery area C includes a solid waste recovery bin 8 and a screw conveyor 9 connected at the lower end, which are installed in sequence from top to bottom. The upper end of the solid waste recovery area C is connected to the flue gas reaction area A.

[0031] The liquid preparation area D includes an adsorption liquid tank 10, an agitator 11 and an infusion pump 12 installed in sequence; the adsorption liquid tank 10 is equipped with an infusion pump 11 and an infusion pipeline 13, and the infusion pipeline 13 connects the rotary atomizer 2 and the rotary atomizer 4.

[0032] Specific work:

[0033] 1) placing the flue gas multi-pollutant purification material and tap water in the adsorption liquid tank 10 according to the proportion, and stirring the flue gas multi-pollutant purification material by the stirrer 11 to dissolve it into a 5% aqueous solution, which is the adsorption liquid;

[0034] 2) Connect the smoke to the smoke inlet 1, and pump the adsorption liquid from the infusion pump 12 and the infusion pipeline 13 into the rotary atomizer 1 2 and the rotary atomizer 2 4;

[0035] 3) After the flue gas enters the flue gas reaction zone A, it moves upward. Under the action of the liquid spraying in the rotary atomizer 1 2 and the rotary atomizer 2 4, the flue gas pollutants and the adsorption liquid undergo several chemical and physical reaction processes such as countercurrent contact, adsorption, wetting, reaction, and condensation. The flue gas pollutants pass through the cyclone filter 1 3 and the cyclone filter 2 5, and the flue gas pollutants condense into smoke dust particles, which increase in size and weight and settle.

[0036] 4) After passing through the cyclone filter 1 3 and the cyclone filter 2 5, the flue gas and smoke dust particles are enlarged and weighted and separated. The separated gas passes through the ceramic membrane filter plate 6 again to filter the organic matter in the flue gas and settle it in the reaction zone to continue to adsorb the smoke dust. The filtered gas is discharged from the purified gas outlet 7.

[0037] 5) During the process of smoke dust particles increasing in size, weight and settling, they react with the imported high-temperature flue gas to dehydrate and solidify. The solidified and dried smoke particles sink to the solid waste recovery bin in the solid waste recovery area C, and are then output and packaged by the screw conveyor 9 and can be used as raw materials for agricultural compound fertilizer.

[0038] In order to achieve better flue gas multi-pollutant purification effect, a new flue gas purification material and adsorption liquid are provided. The flue gas purification material is dissolved into a 5% aqueous solution to obtain the adsorption liquid. The preparation method is as follows:

[0039] Embodiment 1:

[0040] Flue gas multi-pollutant purification materials and adsorption liquid are prepared as follows:

[0041] 1) Modified humic acid: 100 parts of lignite crushed to 0.3 mm are weighed and put into a reactor, and water vapor is introduced and stirred for activation treatment. The temperature is controlled at 150-200° C. and the activation treatment is carried out for 40 minutes, so that the lignite particles are filled with water to complete the lignite activation process; then 50 parts of 10% sodium hydroxide liquid are added for sodiumization reaction, and the reaction is completed after stirring for 30 minutes, and then the modified humic acid is formed after being dried by superheated steam.

[0042] 2) Nano catalyst: weigh 70 parts of nano magnesium oxide, 15 parts of calcium hypochlorite, and 15 parts of potassium permanganate and mix them evenly to form a strong base catalyst.

[0043] 3) Viscous adsorbent: 85 parts of cassava flour, 5 parts of oxidase and 10 parts of sodium carbonate are mixed evenly to form a viscous adsorbent.

[0044] 4) 60 parts of modified humic acid, 25 parts of nano catalyst and 15 parts of viscous adsorbent are put into a reactor and mixed evenly, and then crushed into 150 mesh to obtain a flue gas purification material.

[0045] 5) Stir and dissolve the flue gas purification material into a 5% aqueous solution to obtain the adsorption liquid.

[0046] The adsorption liquid has the properties of adsorption, capture, reaction, rapid coagulation, condensation and solidification of flue gas, so that many pollutants in the flue gas are adsorbed as smoke dust particles. Under the physical action of the cyclone, the smoke dust particles are condensed, enlarged and weighted. At the same time, through the high temperature of the flue gas, the condensed and enlarged smoke dust particles are dehydrated and solidified into compound fertilizer raw materials.

[0047] The more detailed steps are:

[0048] Step 1: Introduce flue gas into the flue gas inlet 1; at the same time, prepare adsorption liquid in the adsorption liquid tank 10 for use.

[0049] Step 2: The adsorption liquid is pumped into the rotary atomizer 2 and the rotary atomizer 4 through the infusion pump 12 and the infusion pipe 13 respectively, and the adsorption liquid is sprayed into the flue gas through the nozzles of the rotary atomizer 2 and the rotary atomizer 4. Under the high-speed rotation of the rotary atomizer, the atomized adsorption liquid is countercurrently contacted with the multiple pollutants in the flue gas, and chemical and physical reactions such as adsorption, condensation, and consolidation are carried out to form smoke particles.

[0050] Step 3: After passing through the cyclone filter 1 3 and the cyclone filter 2 5, the flue gas and smoke dust particles are enlarged and weighted and separated. The separated flue gas passes through the ceramic membrane filter plate 6 to filter the flue gas organic matter and settle it in the reaction zone to continue to adsorb the smoke dust. The filtered gas is discharged from the gas outlet 7.

[0051] Step 4: During the process of smoke dust particles increasing in size, weight and settling, they react with the imported high-temperature flue gas for dehydration and then solidify. The solidified and dried smoke particles sink to the solid waste recovery area C, and then are output through the screw conveyor 9 and packaged for use as raw materials for agricultural compound fertilizers.

[0052] The present invention provides two examples of flue gas multi-pollutant purification materials and adsorption liquid preparation to illustrate:

[0053] Embodiment 2:

[0054] The flue gas multi-pollutant purification material and the preparation method of the adsorption liquid include the following steps:

[0055] 1) Modified humic acid: 100 parts of lignite crushed to 0.3 mm are weighed and put into a reactor, and water vapor is introduced and stirred for activation treatment. The temperature is controlled at 150-200° C. and the activation treatment is carried out for 40 minutes, so that the lignite particles are filled with water to complete the lignite activation process; then 50 parts of 10% sodium hydroxide liquid are added for sodiumization reaction, and the reaction is completed after stirring for 30 minutes, and then the modified humic acid is formed by drying with superheated steam;

[0056] 2) Nano catalyst: 70 parts of nano magnesium oxide, 15 parts of calcium hypochlorite and 15 parts of potassium permanganate are mixed evenly to form a strong base catalyst;

[0057] 3) Viscous adsorbent: 85 parts of cassava flour, 5 parts of oxidase and 10 parts of sodium carbonate are mixed evenly to form a viscous adsorbent;

[0058] 4) 50 parts of modified humus, 30 parts of nano catalyst and 20 parts of adsorbent were put into the above reactor, mixed and homogenized for 8 minutes, and crushed into 150 mesh to obtain the flue gas purification material.

[0059] 5) Stir and dissolve the flue gas purification material into a 5% aqueous solution to obtain the adsorption liquid.

[0060] Embodiment 3:

[0061] 1) Modified humic acid: 100 parts of lignite crushed to 0.3 mm are weighed and put into a reactor, and water vapor is introduced and stirred for activation treatment. The temperature is controlled at 150-200° C. and the activation treatment is carried out for 40 minutes, so that the lignite particles are filled with water to complete the lignite activation process; then 50 parts of 10% sodium hydroxide liquid are added for sodiumization reaction, and the reaction is completed after stirring for 30 minutes, and then the modified humic acid is formed by drying with superheated steam;

[0062] 2) Nano catalyst: weigh 70 parts of nano magnesium oxide, 15 parts of calcium hypochlorite, and 15 parts of potassium permanganate and mix them evenly to form a strong base catalyst;

[0063] 3) Viscous adsorbent: 85 parts of cassava flour, 5 parts of oxidase and 10 parts of sodium carbonate are mixed evenly to form a viscous adsorbent;

[0064] 4) Flue gas purification material: 70 parts of modified humus, 20 parts of nano catalyst and 10 parts of adsorbent are put into the above reactor, mixed and homogenized for 8 minutes, and crushed into 150 mesh to obtain the flue gas multi-pollutant purification material.

[0065] 5) Stir and dissolve the flue gas multi-pollutant purification material into a 5% aqueous solution to form the adsorption solution.

[0066] Effect test of the flue gas pollution purification material of the present invention:

[0067] According to the requirements of the "Standard for Pollution Control of Domestic Waste Incineration" (GB18485-2014), when the flue gas volume is 25000m 3 / h garbage incinerator in practice, the flue gas temperature is 160℃, the flue gas flow rate is 5m / s, the flue gas is introduced into the flue gas purification tower, so that the flue gas pollutants are in countercurrent contact with the adsorption liquid with high-speed rotating atomization. The flue gas undergoes atomization wetting, condensation, reaction, sedimentation, filtration and other oxidation, catalysis and reduction reaction processes to achieve the removal of multiple pollutants in the flue gas. The specific data are shown in Table 1.

[0068] Example 1, 2 Application test data table 1 hour average (unit mg / Nm 3 ).

[0069]

[0070] Among them, the numerical value of Example 3 is not much different from that of Examples 1 and 2, which is not shown in Table 1, and the prior art refers to the technology pointed out in the background technology, such as SCR denitrification + bag dust removal + lime-gypsum desulfurization + wet electrostatic precipitator. Since the prior art adopts distributed step-by-step purification, and the present invention is an overall one-step purification, the time is much less than the prior art. Therefore, the average value within 1 hour, the present invention has obvious advantages.

Claims

1. A flue gas purification device for absorbing, capturing and solidifying multiple pollutants in flue gas, characterized in that: include: Flue gas reaction area A, flue gas purification area B, solid waste recovery area C and liquid preparation area D; The flue gas reaction zone A comprises a flue gas inlet (1), a rotary atomizer 1 (2), a cyclone filter 1 (3), and a rotary atomizer 2 (4); the upper end of the flue gas reaction zone A is connected to the flue gas purification zone B, and the lower end is connected to the solid waste recovery zone C; The flue gas purification zone B comprises a cyclone filter 2 (5), a ceramic membrane filter plate (6) and a purified gas outlet (7) installed in sequence from bottom to top, and the lower end of the flue gas purification zone B is connected to the flue gas reaction zone A; The solid waste recovery area C comprises a solid waste recovery bin (8) installed in sequence from top to bottom and a screw conveyor (9) connected at the lower end, and the upper end of the solid waste recovery area C is connected to the flue gas reaction area A; The liquid preparation area D comprises an adsorption liquid tank (10), a stirrer (11) and an infusion pump (12) which are installed in sequence; the infusion pump (12) and an infusion pipeline (13) are installed in the adsorption liquid tank (10); the infusion pump (12) is connected to the rotary atomizer 1 (2) and the rotary atomizer 2 (4) via the infusion pipeline (13); and the adsorption liquid is stored in the adsorption liquid tank (10); The preparation steps of the adsorption liquid are as follows: 1) Modified humic acid; 100 parts of lignite crushed to 0.3 mm are weighed and put into a reactor, and water vapor is introduced and stirred for activation treatment. The temperature is controlled at 150-200° C. and the activation treatment is carried out for 40 minutes, so that the lignite particles are filled with water to complete the lignite activation process; then 50 parts of 10% sodium hydroxide liquid are added for sodiumization reaction, and the reaction is completed after stirring for 30 minutes, and then the modified humic acid is formed after being dried by superheated steam; 2) Nano catalyst: 70 parts of nano magnesium oxide, 15 parts of calcium hypochlorite and 15 parts of potassium permanganate were weighed and mixed evenly to form a strong base catalyst; 3) a viscous adsorbent; 85 parts of cassava flour, 5 parts of oxidase, and 10 parts of sodium carbonate are mixed uniformly to form a viscous adsorbent; 4) 60 parts of modified humic acid, 25 parts of nano catalyst and 15 parts of viscous adsorbent are put into a reactor and mixed evenly, and crushed into 150 mesh to obtain the flue gas purification material; 5) The flue gas purification material is made into a 5% aqueous solution to form the adsorption liquid.

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