Efficient incineration flue gas treatment device

Abstract

The utility model provides a high-efficiency incineration flue gas treatment device which is characterized in that incineration flue gas is introduced into a high-temperature cyclone separator, the high-temperature cyclone separator is connected with a secondary combustion chamber, the secondary combustion chamber is connected with a waste heat boiler, the waste heat boiler is connected with a quench tower, a quench tower body is connected with a spray pump, the spray pump is connected with a neutralization pool, and the neutralization pool is connected with a secondary combustion chamber. A gas phase outlet of the quench tower is connected with a bag-type dust collector, the bag-type dust collector is connected with an SCR denitration tower, the SCR denitration tower is connected with a deacidification tower, a tower body of the deacidification tower is connected with a deacidification circulating pump, the deacidification circulating pump is connected with a neutralization pool, a gas phase outlet of the deacidification tower is connected with a tail gas condenser, and a discharge outlet in the bottom of the tail gas condenser is connected with the neutralization pool. The side surface of the tail gas condenser is connected with a fan which is connected with a tail gas chimney, and the neutralizing tank is connected with a liquid caustic soda feeding bin.

Description

Technical Field

[0001] The utility model relates to the field of incineration flue gas treatment devices, mainly a flue gas treatment device after the incineration of phosphate salt at the end of the comprehensive treatment of glyphosate mother liquor. Background Art

[0002] With the continuous improvement of environmental protection laws and regulations, the environmental protection control situation has become increasingly severe, and tail gas treatment technology has been widely used and continuously improved in the incineration industry. The main goal of tail gas treatment is to remove harmful gases and particulate matter generated during the incineration process to meet environmental protection standards and reduce pollution to the environment, including the removal of sulfur dioxide, nitrogen oxides, particulate matter, dioxins and other harmful substances.

[0003] At present, the main technologies used in the incineration industry for tail gas treatment include wet desulfurization, dry desulfurization, semi-dry desulfurization, selective catalytic reduction (SCR) denitrification, selective non-catalytic reduction (SNCR) denitrification, activated carbon adsorption, etc. The vertical furnace for incineration of glyphosate mother liquor phosphate salt adopts the flue gas purification process and technology of "flue gas quenching + bag dust removal + wet desulfurization + flue gas heating + SCR denitrification". The advantages of this process are that the quality exchange between the absorption liquid and the exhaust gas is more complete, and the harmful gas removal efficiency is high, but it also has great disadvantages: 1. The utilization rate of flue gas waste heat is not high, and secondary heating is required in the SCR denitrification section, which causes gas consumption and increases operating costs; 2. After the secondary heating of the SCR denitrification at the end, the exhaust temperature is too high. When it is transported to the chimney for high-altitude discharge through the induced draft fan, it is very easy to condense into water, resulting in a large number of water droplets floating at the chimney outlet, affecting on-site environmental protection control; 3. In the wet desulfurization process, the countercurrent of the deacidified absorption liquid and the exhaust gas leads to increased exhaust resistance and increased water consumption. The inorganic salts formed by acid-base neutralization increase the generation of solid waste and are not easy to dispose of. Utility Model Content

[0004] The main purpose of the utility model is to provide an incineration flue gas treatment device, firstly, to improve the utilization rate of flue gas waste heat; secondly, to remove flue gas dust and nitrogen oxides, and absorb acidic gases; thirdly, to use condensed water as water for the neutralization tank to reduce water consumption; fourthly, to use the alkaline absorption liquid in the neutralization tank as spray water for the quenching tower, so as to achieve the purpose of treating waste with waste.

[0005] In order to solve the above technical problems, the utility model provides a high-efficiency incineration flue gas treatment device: the incineration flue gas is connected to a high-temperature cyclone separator, the high-temperature cyclone separator is connected to a secondary combustion chamber, the secondary combustion chamber is connected to a waste heat boiler, the waste heat boiler is connected to a quenching tower, the quenching tower body is connected to a spray pump, the spray pump is connected to a neutralization tank, the quenching tower gas phase outlet is connected to a bag filter, the bag filter is connected to an SCR denitrification tower, the SCR denitrification device is connected to a deacidification tower, the deacidification tower body is connected to a deacidification circulation pump, the deacidification circulation pump is connected to a neutralization tank, the deacidification tower gas phase outlet is connected to a tail gas condenser, the bottom discharge port of the tail gas condenser is connected to the neutralization tank, the side of the tail gas condenser is connected to a fan, the fan is connected to the tail gas chimney, and the neutralization tank is connected to a liquid alkali feeding bin.

[0006] In the preferred embodiment, the high-temperature cyclone has the function of gas-solid separation, the flue gas enters the cyclone separator for gas-solid separation, the separated inorganic salts are sent to the inorganic salt collection system for collection, and the flue gas enters the secondary combustion chamber.

[0007] In the preferred embodiment, the secondary combustion chamber further burns organic matter in the flue gas to generate secondary waste heat, which enters the waste heat boiler to convert the flue gas heat into by-product steam.

[0008] In the preferred embodiment, the quenching tower is provided with a spray pump, and the spraying in the tower is arranged in three layers, each layer is provided with a thermometer probe and a spray regulating valve, which is used to reduce the temperature of the flue gas passing through the waste heat boiler to the set temperature, and the spray liquid adopts the alkaline absorption liquid of the neutralization tank.

[0009] In the preferred embodiment, the SCR denitrification tower is arranged at the rear end of the bag filter, and can use the waste heat of the flue gas to prepare for the removal of NOx carried in the flue gas.

[0010] In the preferred embodiment, a deacidification circulation pump is arranged outside the deacidification tower, and the spraying inside the tower is arranged in two layers. Each layer of the spray pipe is provided with a regulating valve, namely regulating valve four and regulating valve five. A wire mesh demister is arranged on the upper layer of the tower, and the spraying liquid adopts the alkaline absorption liquid of the neutralization tank.

[0011] In a preferred embodiment, a circulating water fin tube is provided inside the tail gas condenser, and the condensate is discharged into the neutralization tank through a drain port as water replenishment for the neutralization tank.

[0012] In the preferred embodiment, the neutralization tank is provided with a pH meter and a feed regulating valve for pH value monitoring and automatic addition of liquid alkali, and the two are interlocked to maintain the pH value of the neutralization tank stable.

[0013] In the preferred embodiment, the temperature detector 1, temperature detector 2 and temperature detector 3 of the quenching tower are interlocked with the spray regulating valve 1, spray regulating valve 2 and spray regulating valve 3 to maintain the stable outlet temperature of the quenching tower.

[0014] In the preferred embodiment, a denitration reducing agent is uniformly sprayed into the SCR denitration tower, and the denitration reducing agent is decomposed into NH3, which is mixed with the hot flue gas, and then the NOx carried in the flue gas is reduced and removed under the action of the catalyst in the SCR denitration tower.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model provides a high-efficiency incineration flue gas treatment device, which can be applied to high-temperature flue gas waste heat utilization, flue gas dust absorption and removal, acid gas absorption and nitrogen oxide removal technology. The invention is applicable to the exhaust gas system of all incinerator flue gas treatment, including dust absorption and nitrogen oxide removal, acid gas absorption, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the utility model device.

[0018] Explanation of the markings in the figure: 1. High-temperature cyclone separator; 2. Second combustion chamber; 3. Waste heat boiler; 4. Rapid cooling tower; 5. Spray pump; 6. Bag filter; 7. SCR denitrification tower; 8. Deacidification tower; 9. Deacidification circulation pump; 10. Tail gas condenser; 11. Fan; 12. Tail gas chimney; 13. Neutralization tank; 14. Liquid alkali feeding bin; 4-1. Spray regulating valve one; 4-2. Spray regulating valve two; 4-3. Spray regulating valve three; 4-1´, temperature detector one; 4-2´, temperature detector two; 4-3´, temperature detector three; 8-1, temperature detector four; 8-2, regulating valve four; 8-3, regulating valve five; 8-4, wire mesh demister; 10-1, circulating water inlet; 10-2, circulating water outlet; 13-1, pH meter; 14-1, unloading regulating valve. DETAILED DESCRIPTION

[0019] The implementation scheme of the utility model will be described in detail below in conjunction with examples. The following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.

[0020] Example 1

[0021] A high-efficiency incineration flue gas treatment device, incineration flue gas is introduced into a high-temperature cyclone separator 1, the high-temperature cyclone separator 1 is connected to a secondary combustion chamber 2, the secondary combustion chamber 2 is connected to a waste heat boiler 3, the waste heat boiler 3 is connected to a quenching tower 4, the quenching tower 4 is connected to a spray pump 5, the spray pump 5 is connected to a neutralization tank 13, the gas phase outlet of the quenching tower 4 is connected to a bag filter 6, the bag filter 6 is connected to an SCR denitration tower 7, the SCR denitration tower 7 is connected to a deacidification tower 8, the deacidification tower 8 is connected to a deacidification circulation pump 9, the deacidification circulation pump 9 is connected to a neutralization tank 13, the gas phase outlet of the deacidification tower 8 is connected to a tail gas condenser 10, the bottom discharge port of the tail gas condenser 10 is connected to the neutralization tank 13, the side of the tail gas condenser 10 is connected to a fan 11, the fan 11 is connected to a tail gas chimney 12, and the neutralization tank 13 is connected to a liquid alkali feeding bin 14.

[0022] The high-temperature cyclone separator 1 has the function of gas-solid separation. The flue gas enters the high-temperature cyclone separator 1 for gas-solid separation. The separated inorganic salts are sent to the inorganic salt collection system for collection, and the flue gas enters the secondary combustion chamber 2.

[0023] The secondary combustion chamber 2 further burns organic matter in the flue gas to generate secondary waste heat, which enters the waste heat boiler 3 to convert the flue gas heat into by-product steam.

[0024] The quenching tower 4 is provided with a spray pump 5. The spraying in the tower is arranged in three layers. Each layer is provided with a thermometer probe and a spray regulating valve for reducing the temperature of the flue gas passing through the waste heat boiler 3 to a set temperature. The spray liquid adopts the alkaline absorption liquid of the neutralization tank 13.

[0025] The SCR denitration tower 7 is arranged at the rear end of the bag filter 6, and can utilize the waste heat of the flue gas to prepare for removing NOx carried in the flue gas.

[0026] The deacidification tower 8 is provided with a deacidification circulation pump 9 outside, and the spraying arrangement in the tower is two-layered. Each layer of the spray pipe is provided with a regulating valve, which are regulating valve four 8-2 and regulating valve five 8-3 respectively. A wire mesh demister 8-4 is provided on the upper layer of the tower, and the spraying liquid adopts the alkaline absorption liquid of the neutralization tank 13.

[0027] The tail gas condenser 10 is provided with circulating water fin tubes inside, and the condensate is discharged to the neutralization tank 13 as neutralization tank replenishment water.

[0028] The neutralization tank 13 is provided with a pH meter 13-1 and a material discharge regulating valve 14-1, which are interlocked to maintain the pH value of the neutralization tank 13 stable.

[0029] The quenching tower 4 is provided with a temperature detector 1 4-1', a temperature detector 2 4-2', a temperature detector 3 4-3' which are interlocked with a spray regulating valve 1 4-1, a spray regulating valve 2 4-2, and a spray regulating valve 3 4-3 to maintain the outlet temperature of the quenching tower 4 stable.

[0030] The denitration reducing agent is uniformly sprayed into the SCR denitration tower 7 , and the denitration reducing agent is decomposed into NH 3 , which is mixed with the hot flue gas, and then the NOx carried in the flue gas is reduced and removed under the action of the catalyst in the SCR denitration tower 7 .

[0031] Example 2

[0032] The device of Example 1 is used. During operation, the incineration flue gas of the previous process is separated into gas and solid by the high-temperature cyclone separator 1, and then enters the secondary combustion chamber 2 for secondary combustion. The secondary combustion chamber 2 is connected to the waste heat boiler 3 through a smoke and air duct, and steam is generated by using waste heat; the top of the waste heat boiler 3 is connected to the top of the quenching tower 4 through a smoke and air duct; the high-temperature flue gas is sprayed into the quenching tower 4 through a spray pump 5, and the temperature is reduced to meet the receiving conditions of the bag dust collector 6 before entering the bag dust collector 6; the hot flue gas is discharged from the outlet of the bag dust collector 6 and sent to the SCR denitrification tower 7, and the hot flue gas is used to remove the flue gas. The flue gas is prepared for NOx carried in the air and nitrogen oxides are reduced. The flue gas flows countercurrently into the deacidification tower 8 through the bottom of the SCR denitrification tower 7. The deacidification tower 8 uses the deacidification circulation pump 9 to pump alkali liquid into the deacidification tower 8 to react, neutralize and absorb the acidic gas. The top of the deacidification tower 8 and the top of the tail gas condenser 10 are connected through the smoke and air duct. The tail gas condenser 10 uses internal finned tubes to cool the high-temperature and high-humidity flue gas. The finned tubes use circulating water for cooling and condensation. The condensed water is reused in the neutralization tank 13. The flue gas at the outlet of the tail gas condenser 10 is transported to the tail gas chimney 12 through the fan 11.

[0033] Among them: the spray pump 5 transports the circulating liquid in the neutralization tank 13 to the quenching tower 4, the deacidification circulation pump 9 transports the circulating liquid in the neutralization tank 13 to the deacidification tower 8, and the liquid alkali feeding bin 14 adds liquid alkali to the neutralization tank 13 through the discharge regulating valve 14-1.

[0034] In this embodiment, the design interlock can be set through DCS. The spray regulating valve 1 4-1, the spray regulating valve 2 4-2, the spray regulating valve 3 4-3 of the quench tower 4 are interlocked with the temperature detector 1 4-1´, the temperature detector 2 4-2´, the temperature detector 3 4-3´; the inlet temperature detector 4 8-1 of the deacidification tower 8 is interlocked with the regulating valve 4 8-2, the regulating valve 5 8-3; the unloading regulating valve 14-1 of the liquid alkali feeding bin 14 is interlocked with the pH meter 13-1 of the neutralization tank 13.

[0035] The utility model realizes the improvement of the utilization rate of flue gas waste heat, the removal of flue gas dust, nitrogen oxides and acidic gases, and the purpose of reducing water consumption.

[0036] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A highly efficient incineration flue gas treatment device, characterized in that: The incineration flue gas is introduced into a high-temperature cyclone separator (1), the high-temperature cyclone separator (1) is connected to the secondary combustion chamber (2), the secondary combustion chamber (2) is connected to the waste heat boiler (3), the waste heat boiler (3) is connected to the quenching tower (4), the tower body of the quenching tower (4) is connected to the spray pump (5), the spray pump (5) is connected to the neutralization tank (13), the gas phase outlet of the quenching tower (4) is connected to the bag filter (6), the bag filter (6) is connected to the SCR denitration tower (7), the SCR denitration tower (7) is connected to the SCR denitration tower (7) ) is connected to a deacidification tower (8), the body of the deacidification tower (8) is connected to a deacidification circulation pump (9), the deacidification circulation pump (9) is connected to a neutralization tank (13), a gas phase outlet of the deacidification tower (8) is connected to a tail gas condenser (10), a bottom discharge outlet of the tail gas condenser (10) is connected to the neutralization tank (13), a side of the tail gas condenser (10) is connected to a fan (11), the fan (11) is connected to a tail gas chimney (12), and the neutralization tank (13) is connected to a liquid alkali feeding bin (14).

2. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The high-temperature cyclone separator (1) has the function of gas-solid separation. The flue gas enters the high-temperature cyclone separator (1) for gas-solid separation. The separated inorganic salts are sent to the inorganic salt collection system for collection, and the flue gas enters the secondary combustion chamber (2).

3. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The secondary combustion chamber (2) further burns organic matter in the flue gas to generate secondary waste heat, which enters the waste heat boiler (3) to convert the flue gas heat into by-product steam.

4. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The quenching tower (4) is provided with a spray pump (5), and the spraying arrangement in the tower is three layers, each layer being provided with a thermometer probe and a spray regulating valve, for reducing the temperature of the flue gas passing through the waste heat boiler (3) to a set temperature, and the spray liquid is the alkaline absorption liquid of the neutralization tank (13).

5. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The SCR denitrification tower (7) is arranged at the rear end of the bag filter (6) and can utilize the waste heat of the flue gas to prepare for the removal of NOx carried in the flue gas.

6. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The deacidification tower (8) is provided with a deacidification circulation pump (9) outside, and the tower is provided with two layers of spraying. Each layer of the spraying pipe is provided with a regulating valve, namely, regulating valve four (8-2) and regulating valve five (8-3). The upper layer of the tower is provided with a wire mesh demister (8-4), and the spraying liquid adopts the alkaline absorption liquid of the neutralization tank (13).

7. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The tail gas condenser (10) is provided with circulating water fin tubes inside, and the condensate is discharged into the neutralization tank (13) as neutralization tank replenishment water.

8. The high-efficiency incineration flue gas treatment device according to claim 1 is characterized in that: The neutralization tank (13) is provided with a pH meter (13-1) and a material discharge regulating valve (14-1), which are interlocked to maintain a stable pH value of the neutralization tank (13).

9. The high-efficiency incineration flue gas treatment device according to claim 4, characterized in that: The quenching tower (4) is provided with a temperature detector 1 (4-1'), a temperature detector 2 (4-2'), and a temperature detector 3 (4-3'), which are interlocked with a spray regulating valve 1 (4-1), a spray regulating valve 2 (4-2), and a spray regulating valve 3 (4-3) to maintain a stable outlet temperature of the quenching tower (4).

10. The high-efficiency incineration flue gas treatment device according to claim 1, characterized in that: A denitration reducing agent is uniformly sprayed into the SCR denitration tower (7), and the denitration reducing agent is decomposed into NH3, which is mixed with the hot flue gas and then reduced and removed by the catalyst in the SCR denitration tower (7).

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