CN112619392A - Dust removal, desulfurization and denitrification process for boiler flue gas - Google Patents
Dust removal, desulfurization and denitrification process for boiler flue gas Download PDFInfo
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- CN112619392A CN112619392A CN202011282358.XA CN202011282358A CN112619392A CN 112619392 A CN112619392 A CN 112619392A CN 202011282358 A CN202011282358 A CN 202011282358A CN 112619392 A CN112619392 A CN 112619392A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/343—Heat recovery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a dedusting, desulfurization and denitrification process for boiler flue gas, which comprises the following steps: a, recovering waste heat; b, preparing a desulfurization and denitrification preparation; c, performing primary desulfurization and denitrification treatment; d, performing secondary desulfurization and denitrification treatment; e, preparing the fertilizer. The invention can recover the waste heat of the flue gas generated by the boiler, saves resources, and the biochar is prepared by carbonizing plant stems residual by cotton plants and rice stems residual by rice, thereby changing waste into valuable, further saving resources and reducing cost. The desulfurization and denitrification preparation can be used for producing fertilizers after desulfurization and denitrification, so that economic value can be created; the flue gas through one-level SOx/NOx control handles and second grade SOx/NOx control handles purifying effect good, SOx/NOx control is effectual. In addition, the invention has simple process and convenient operation.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a dedusting, desulfurization and denitrification process for boiler flue gas.
Background
Boiler flue gas is a mixture of gas and smoke dust and is the main cause of atmospheric pollution in residential areas. The components of the flue gas are complex, the gas comprises water vapor, sulfur dioxide, hydrocarbons, nitrogen oxides and the like, and the smoke dust comprises ash, coal particles, oil drops, high-temperature cracking products and the like of the fuel. Therefore, the pollution of the flue gas to the environment is the composite pollution of various poisons. The hazard of smoke to human bodies is related to the size of particles, most of which are fly ash with the diameter less than 10 microns, and particularly the fly ash with the diameter of 1-2.5 microns is the most harmful to human bodies. The existing dedusting, desulfurization and denitrification process has the disadvantages of complex process, high production cost, poor desulfurization and denitrification effect and incapability of fully utilizing resources.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a dedusting, desulfurization and denitrification process for boiler flue gas.
In order to achieve the purpose, the invention adopts the following technical scheme: a dedusting, desulfurization and denitrification process for boiler flue gas comprises the following steps:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
Taking 20-40 parts of biochar, 4-6 parts of wheat bran, 5-8 parts of diatomite, 3-5 parts of potassium humate, 2-3 parts of bentonite, 1-2 parts of turfy soil and 15-20 parts of ammonia water for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
In the step a, a filter screen is installed on a pipeline for hot flue gas to enter the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned on the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
In the step b, the biochar is prepared by carbonizing plant stems remaining in cotton plants and rice stems remaining in rice.
In the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water adopts ammonia water with the mass concentration of 0.1-1.5%.
In the step d, the residual NOx in the flue gas is removed by adopting a selective reduction method. The selective reduction method for removing NOx belongs to the conventional technology in the field, and the selective reduction is carried out at the temperature of 250-550 ℃ in the presence of a selective reduction catalyst by taking ammonia as a reducing agent. The reducing agent ammonia is added in an amount of NH3NH consumed by catalytic reduction reaction with NOx3The amount of (2) is determined by first analyzing the NOx content and the type of the NOx in the flue gas, and NH3Then 0.9 to 1.1 times, preferably 1 time, the amount theoretically required for the reaction.
In the step e, the trace element fertilizer consists of an iron fertilizer, a boron fertilizer, a manganese fertilizer, a copper fertilizer, a zinc fertilizer and a molybdenum fertilizer.
The weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
in the step e, the mass ratio of the desulfurization and denitrification preparation, the ammonium chloride, the urea, the trace element fertilizer, the potassium chloride, the water and the azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
the invention has the beneficial effects that: the invention can recover the waste heat of the flue gas generated by the boiler, saves resources, and the biochar is prepared by carbonizing plant stems residual by cotton plants and rice stems residual by rice, thereby changing waste into valuable, further saving resources and reducing cost. The desulfurization and denitrification preparation can be used for producing fertilizers after desulfurization and denitrification, so that economic value can be created; the flue gas through one-level SOx/NOx control handles and second grade SOx/NOx control handles purifying effect good, SOx/NOx control is effectual. In addition, the invention has simple process and convenient operation.
Detailed Description
The invention will be further illustrated with reference to specific examples:
a dedusting, desulfurization and denitrification process for boiler flue gas comprises the following steps:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
Taking 20-40 parts of biochar, 4-6 parts of wheat bran, 5-8 parts of diatomite, 3-5 parts of potassium humate, 2-3 parts of bentonite, 1-2 parts of turfy soil and 15-20 parts of ammonia water for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
In the step a, a filter screen is installed on a pipeline for hot flue gas to enter the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned on the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
In the step b, the biochar is prepared by carbonizing plant stems remaining in cotton plants and rice stems remaining in rice.
In the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water adopts ammonia water with the mass concentration of 0.1-1.5%.
In the step d, the residual NOx in the flue gas is removed by adopting a selective reduction method. The selective reduction method for removing NOx belongs to the conventional technology in the field, and the selective reduction is carried out at the temperature of 250-550 ℃ in the presence of a selective reduction catalyst by taking ammonia as a reducing agent. The reducing agent ammonia is added in an amount of NH3NH consumed by catalytic reduction reaction with NOx3The amount of (2) is determined by first analyzing the NOx content and the type of the NOx in the flue gas, and NH3Then 0.9 to 1.1 times, preferably 1 time, the amount theoretically required for the reaction.
In the step e, the trace element fertilizer consists of an iron fertilizer, a boron fertilizer, a manganese fertilizer, a copper fertilizer, a zinc fertilizer and a molybdenum fertilizer.
The weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
in the step e, the mass ratio of the desulfurization and denitrification preparation, the ammonium chloride, the urea, the trace element fertilizer, the potassium chloride, the water and the azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
example 1
A dedusting, desulfurization and denitrification process for boiler flue gas comprises the following steps:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
Taking 20 parts of biochar, 4 parts of wheat bran, 5 parts of diatomite, 3 parts of potassium humate, 2 parts of bentonite, 1 part of turfy soil and 15 parts of ammonia water according to parts by weight for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
In the step a, a filter screen is installed on a pipeline for hot flue gas to enter the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned on the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
In the step b, the biochar is prepared by carbonizing plant stems remaining in cotton plants and rice stems remaining in rice.
In the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water adopts ammonia water with the mass concentration of 0.1-1.5%.
In the step e, the trace element fertilizer consists of an iron fertilizer, a boron fertilizer, a manganese fertilizer, a copper fertilizer, a zinc fertilizer and a molybdenum fertilizer.
The weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
in the step e, the mass ratio of the desulfurization and denitrification preparation, the ammonium chloride, the urea, the trace element fertilizer, the potassium chloride, the water and the azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
example 2
A dedusting, desulfurization and denitrification process for boiler flue gas comprises the following steps:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
Taking 40 parts of biochar, 6 parts of wheat bran, 8 parts of diatomite, 5 parts of potassium humate, 3 parts of bentonite, 2 parts of turfy soil and 20 parts of ammonia water according to parts by weight for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
In the step a, a filter screen is installed on a pipeline for hot flue gas to enter the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned on the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
In the step b, the biochar is prepared by carbonizing plant stems remaining in cotton plants and rice stems remaining in rice.
In the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water adopts ammonia water with the mass concentration of 0.1-1.5%.
In the step e, the trace element fertilizer consists of an iron fertilizer, a boron fertilizer, a manganese fertilizer, a copper fertilizer, a zinc fertilizer and a molybdenum fertilizer.
The weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
in the step e, the mass ratio of the desulfurization and denitrification preparation, the ammonium chloride, the urea, the trace element fertilizer, the potassium chloride, the water and the azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
example 3
A dedusting, desulfurization and denitrification process for boiler flue gas comprises the following steps:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
According to the weight parts, 30 parts of biochar, 5 parts of wheat bran, 6 parts of diatomite, 4 parts of potassium humate, 2.5 parts of bentonite, 1.2 parts of turfy soil and 18 parts of ammonia water are taken for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
In the step a, a filter screen is installed on a pipeline for hot flue gas to enter the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned on the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
In the step b, the biochar is prepared by carbonizing plant stems remaining in cotton plants and rice stems remaining in rice.
In the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water adopts ammonia water with the mass concentration of 0.1-1.5%.
In the step e, the trace element fertilizer consists of an iron fertilizer, a boron fertilizer, a manganese fertilizer, a copper fertilizer, a zinc fertilizer and a molybdenum fertilizer.
The weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
in the step e, the mass ratio of the desulfurization and denitrification preparation, the ammonium chloride, the urea, the trace element fertilizer, the potassium chloride, the water and the azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
the present invention has been described in connection with the specific embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and it is within the protection scope of the present invention as long as various modifications are made by using the method concept and technical solution of the present invention, or the present invention is directly applied to other occasions without modification.
Claims (7)
1. The dedusting, desulfurization and denitrification process for boiler flue gas is characterized by comprising the following steps of:
a waste heat recovery
Preheating and recovering hot flue gas from a boiler chimney through a gas-liquid heat exchanger;
b preparing a desulfurization and denitrification preparation
Taking 20-40 parts of biochar, 4-6 parts of wheat bran, 5-8 parts of diatomite, 3-5 parts of potassium humate, 2-3 parts of bentonite, 1-2 parts of turfy soil and 15-20 parts of ammonia water for later use;
mixing biochar, wheat bran, diatomite, potassium humate, bentonite and turfy soil by using a stirrer, uniformly mixing, grinding into powder with the particle size of more than 80 meshes, adding ammonia water, and centrifugally stirring for 30min at 100 revolutions per minute to obtain the fertilizer;
c first-stage desulfurization and denitrification treatment
Carrying out primary desulfurization and denitrification on the flue gas preheated and recycled in the step a through the desulfurization and denitrification preparation prepared in the step b;
d two-stage desulfurization and denitrification treatment
Introducing the flue gas subjected to the primary desulfurization and denitrification treatment into a desulfurization tower for desulfurization treatment, wherein the desulfurization treatment adopts an ammonia desulfurization technology, NOx is partially removed during desulfurization, and the gas discharged from the top of the desulfurization tower is subjected to selective reduction and denitrification reaction, so that the desulfurization and denitrification of the flue gas are completed;
e preparation of fertilizers
And (3) recovering the desulfurization and denitrification preparation subjected to the first-stage desulfurization and denitrification treatment, mixing and stirring the desulfurization and denitrification preparation with ammonium chloride, urea, trace element fertilizer, potassium chloride and water uniformly, adding the mixture into a double-screw extrusion granulator, granulating by using the granulator, cooling to room temperature, spraying azotobacter chroococcum, uniformly stirring, and drying at low temperature to obtain the finished product.
2. The process of claim 1, wherein in the step a, a filter screen is installed on a pipeline of the hot flue gas entering the gas-liquid heat exchanger, a dust removal pipe is installed at the bottom of the pipeline positioned at the front side of the filter screen, and a switch valve is installed on the dust removal pipe.
3. The process of claim 1, wherein in the step b, the biochar is prepared by carbonizing plant stems remaining from cotton plants and rice stems remaining from rice plants.
4. The dust removal, desulfurization and denitrification process for boiler flue gas according to claim 1, wherein in the step d, a low-concentration ammonia water desulfurization section is arranged at the upper part of the desulfurization tower, and the low-concentration ammonia water is ammonia water with the ammonia mass concentration of 0.1-1.5%.
5. The process for removing dust, desulfurizing and denitrifying according to claim 1, wherein in step e, the trace element fertilizer consists of iron fertilizer, boron fertilizer, manganese fertilizer, copper fertilizer, zinc fertilizer and molybdenum fertilizer.
6. The dust removal, desulfurization and denitrification process for boiler flue gas according to claim 5, wherein the weight ratio of the iron fertilizer, the boron fertilizer, the manganese fertilizer, the copper fertilizer, the zinc fertilizer and the molybdenum fertilizer is 3: 2: 2: 1: 3: 2.
7. the dust removal, desulfurization and denitrification process for boiler flue gas according to claim 6, wherein in the step e, the mass ratio of the desulfurization and denitrification preparation, ammonium chloride, urea, trace element fertilizer, potassium chloride, water and azotobacter chroococcum is 60: 6: 2: 1: 5: 20: 1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768919A (en) * | 2012-10-26 | 2014-05-07 | 中国石油化工股份有限公司 | Flue gas desulfurization and denitrification process method |
| CN104383809A (en) * | 2014-10-27 | 2015-03-04 | 内蒙古阜丰生物科技有限公司 | Desulfurization and denitration technology for boiler flue gas |
| CN110124451A (en) * | 2019-05-13 | 2019-08-16 | 上海大学 | SO in wet type substep removing flue gas2With the method for NO |
| CN110698305A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Fulvic acid compound fertilizer suitable for corn planting in northeast region and preparation method thereof |
| US20200299207A1 (en) * | 2019-03-22 | 2020-09-24 | Kunming University Of Science And Technology | Method for ammonium-enhanced flue gas desulfurization by using red mud slurry |
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2020
- 2020-11-17 CN CN202011282358.XA patent/CN112619392A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103768919A (en) * | 2012-10-26 | 2014-05-07 | 中国石油化工股份有限公司 | Flue gas desulfurization and denitrification process method |
| CN104383809A (en) * | 2014-10-27 | 2015-03-04 | 内蒙古阜丰生物科技有限公司 | Desulfurization and denitration technology for boiler flue gas |
| US20200299207A1 (en) * | 2019-03-22 | 2020-09-24 | Kunming University Of Science And Technology | Method for ammonium-enhanced flue gas desulfurization by using red mud slurry |
| CN110124451A (en) * | 2019-05-13 | 2019-08-16 | 上海大学 | SO in wet type substep removing flue gas2With the method for NO |
| CN110698305A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Fulvic acid compound fertilizer suitable for corn planting in northeast region and preparation method thereof |
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