CN111672289A - Series-connection type desulfurizing tower and dry-type desulfurizing method thereof - Google Patents

Series-connection type desulfurizing tower and dry-type desulfurizing method thereof Download PDF

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Publication number
CN111672289A
CN111672289A CN202010617744.3A CN202010617744A CN111672289A CN 111672289 A CN111672289 A CN 111672289A CN 202010617744 A CN202010617744 A CN 202010617744A CN 111672289 A CN111672289 A CN 111672289A
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tower
desulfurization
blank
insulating brick
dry
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吴沣
杨家山
程雅琳
梁冉
张谦
李耽华
李超超
党娟
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Kaifeng Pingmei new carbon material technology Co.,Ltd.
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Henan Kaitan New Material Design And Research Institute Co ltd
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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
    • 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
    • B01D53/81—Solid phase processes
    • B01D53/82—Solid phase processes with stationary reactants

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
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  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a series-connection type desulfurizing tower and a dry desulfurizing method thereof, which solve the problems of low desulfurizing efficiency, slow reaction speed, large equipment, easy generation of sulfate aerosol and secondary pollution of air in the traditional dry desulfurizing technology. The invention comprises a closed kiln body, wherein an upper communication pipeline is arranged in the society at the top of the closed kiln body, a lower communication pipeline is arranged at the bottom of the closed kiln body, the inside of the closed kiln body is divided into a plurality of tower chamber units, blank stacks are arranged in the tower chamber units, and the blank stacks are wet blank stacks of honeycomb insulating bricks; and the upper communicating pipeline and the lower communicating pipeline are respectively provided with a plurality of pipeline shutoff valves. The dry desulfurization method provided by the invention has the advantages of low water consumption, no desulfurization wastewater, no sulfate aerosol and no secondary pollution. And the adopted desulfurizing tower does not need a liquid mobile phase, is not easy to block, and has stable and reliable operation and low maintenance cost.

Description

Series-connection type desulfurizing tower and dry-type desulfurizing method thereof
Technical Field
The invention relates to the field of desulfurization, in particular to a series-connection type desulfurizing tower and a dry-type desulfurizing method thereof.
Background
The sulfur-containing waste gas mainly comes from thermal power plants, steel plants, metal smelting plants, chemical plants, cement plants, industrial and civil boilers and the like, and the sulfur-containing compounds comprise hydrogen sulfide, sulfur dioxide, sulfur trioxide, sulfuric acid, sulfite, sulfate and organic sulfur aerosol. With SO2Mainly, the sulfur-containing waste gas discharged without treatment has large smell, seriously pollutes the environment and influences the human health.
Through the analysis and research on the domestic and foreign desulfurization technology and the condition of introducing desulfurization process pilot plant in the domestic power industry, the existing desulfurization method can be generally divided into 3 types of desulfurization before combustion, desulfurization during combustion, desulfurization after combustion and the like.
In the desulfurization, desulfurization after combustion, also called Flue Gas Desulfurization (FGD), is divided into five methods according to the type of the desulfurizing agent: calcium method based on CaCO3 (limestone), magnesium method based on MgO, Na method2SO3Sodium process based on NH3The basic ammonia process, the organic base process based on organic base. The widely used commercial technology in the world is the calcium method, and the proportion is more than 90%.
The desulfurization techniques can be further classified into wet, dry and semi-dry (semi-wet) methods according to the dry and wet states of the absorbent and the desulfurization product during desulfurization. The wet FGD technology is to desulfurize and treat the desulfurization product by using solution or slurry containing absorbent in a wet state, and the method has the advantages of high desulfurization reaction speed, simple equipment, high desulfurization efficiency and the like, but generally has the problems of serious corrosion, high operation and maintenance cost, easy secondary pollution and the like.
The traditional dry desulfurization technology has the disadvantages of low desulfurization efficiency, slow reaction speed, huge equipment and easy generation of sulfate aerosol, and causes secondary pollution to air.
Industrial waste residue refers to toxic, flammable, corrosive, disease-contaming, chemically reactive and other hazardous solid waste discharged in industrial processes; fly ash is one of common industrial waste residues, is fine ash captured from flue gas generated after coal combustion, and is a main solid waste discharged from a coal-fired power plant. The main oxide composition of the fly ash of the thermal power plant in China is as follows: SiO 22、Al2O3、FeO、Fe2O3、CaO、TiO2And the like. Along with the development of the power industry, the discharge amount of fly ash of coal-fired power plants is increased year by year, and the fly ash becomes one of industrial waste residues with larger discharge amount in China. A large amount of industrial waste residues such as fly ash can generate dust without being treated, thereby polluting the atmosphere; if discharged into a water system, the river can be silted, and toxic chemicals in the river can cause harm to human bodies and organisms.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional dry desulfurization technology has low desulfurization efficiency, slow reaction speed and large equipment, and is easy to generate sulfate aerosol to cause secondary pollution of air, and provides a series-connection type desulfurization tower which has low water consumption, does not generate desulfurization waste water, does not generate sulfate aerosol and does not cause secondary pollution, and a dry desulfurization method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: a series-connection type desulfurizing tower comprises a closed kiln body, wherein an upper communicating pipeline is arranged in the society at the top of the closed kiln body, a lower communicating pipeline is arranged at the bottom of the closed kiln body, the inside of the closed kiln body is divided into a plurality of tower chamber units, blank stacks are arranged in the tower chamber units, and the blank stacks are wet blank stacks of honeycomb insulating bricks; the upper communicating pipeline and the lower communicating pipeline are respectively provided with a plurality of pipeline shutoff valves;
the left end of the upper communicating pipeline is provided with a smoke main inlet, and the right end of the lower communicating pipeline is provided with a smoke main outlet.
The adjacent tower room units are separated by partition walls, and pipeline shutoff valves are correspondingly arranged above and below each partition wall.
And the upper part and the lower part of the tower chamber unit are respectively provided with a tower chamber unit isolating valve, and the tower chamber unit is communicated with the upper communicating pipeline and the lower communicating pipeline through the tower chamber unit isolating valves. When the device is used, the opening and closing of the pipeline shutoff valve and the isolation valve of the tower chamber unit are adjusted, so that the flue gas flow directions between the adjacent tower chamber units are opposite, as shown in figure 1, the tower chamber units are connected in series, the content of sulfur dioxide is detected at the flue gas inlet and the flue gas outlet of each tower chamber unit, and the difference value between the sulfur dioxide concentration at the flue gas inlet and the sulfur dioxide concentration at the flue gas outlet of the tower chamber unit of the tower to be desulfurized is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack. And stacking the wet honeycomb insulating brick blank containing hydrated lime in a tower chamber unit, so that the green body pore channel direction of the wet honeycomb insulating brick blank is parallel to the airflow direction. After the flue gas containing sulfur dioxide is introduced into the kiln body unit, the flue gas passes through the air holes of the wet honeycomb insulating brick blank, and the sulfur dioxide in the flue gas is absorbed by the hydrated lime in the wet honeycomb insulating brick blank, so that the aim of removing the sulfur dioxide is fulfilled.
A dry desulfurization method of a series-connection type desulfurization tower comprises the following steps: (1) preparing a wet blank of the honeycomb insulating brick;
(2) stacking the wet honeycomb insulating brick blanks prepared in the step (1) on air-permeable object placing plates, stacking the air-permeable object placing plates fully filled with the wet honeycomb insulating brick blanks to form a blank stack, placing the blank stack into each tower chamber unit of a desulfurizing tower in a serial connection manner, wherein the difference value between the sulfur dioxide concentration at an inlet and the sulfur dioxide concentration at an outlet of a sulfur-containing flue gas inlet of the tower chamber unit of the desulfurizing tower is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack. The breathable storage plate is an air leakage grating plate.
(3) SO at the total outlet of the flue gas on the lower communicating pipeline2When the concentration is higher than the industrial standard 2/3, the difference between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the tower chamber unit is taken outAnd (5) replacing the blank stack with the minimum value with a new bee blank stack. And (4) placing the blank stack taken out from the tower chamber unit in a natural condition for further air drying to form the dry honeycomb insulating brick. The industrial standard refers to the national standard or local standard which is executed by each part according to the actual situation, and the SO specified by the industrial standard2The concentration discharge requirement can be increased or decreased by the number of tower chamber units.
The wet blank of the honeycomb insulating brick in the step (1) is prepared from the following raw materials: the main materials are hydrated lime and fly ash, the auxiliary materials are talcum powder, dextrin, molasses, waste oil and water, and the weight ratio of the hydrated lime to the fly ash is 0.47: 2.3, the dosage of the talcum powder is 1-9% of the dry weight of the hydrated lime and the dry weight of the fly ash, the dosage of the dextrin is 14-29% of the dry weight of the hydrated lime and the dry weight of the fly ash, and the addition amounts of the honey, the waste oil and the water are 0.5-3%, 1-4% and 10-23% of the total weight of the hydrated lime, the fly ash, the talcum powder and the dextrin respectively. The weight ratio of the hydrated lime to the fly ash is the weight ratio of the dry weight of the hydrated lime to the dry weight of the fly ash. The slaked lime, the fly ash, the talcum powder and the dextrin are used as crushing materials, and the passing rate of a 100-mesh screen is required to be 100%.
The preparation method of the wet blank of the honeycomb insulating brick in the step (1) comprises the following steps: a. mixing slaked lime, fly ash, talcum powder, dextrin, molasses, waste oil and water according to the weight ratio to prepare a mixed paste material;
b. extruding and molding the mixed paste prepared in the step (a) in a honeycomb material extruder to prepare a wet blank of the honeycomb insulating brick; the internal structure and the appearance of the wet blank of the insulating brick are controlled by the design of the die according to the requirement.
c. And (b) during extrusion molding of the mixed paste, placing an air-permeable object placing plate at a discharge port of an extruder, placing an extruded wet blank of the honeycomb insulating brick on the air-permeable object placing plate by an automatic stacker crane, removing the air-permeable object placing plate after one air-permeable object placing plate is full, and simultaneously placing another air-permeable object placing plate to collect the wet blank of the honeycomb insulating brick.
The honeycomb brick of the honeycomb heat-insulating brick prepared by the invention has high mechanical strength, heat insulation and sound insulation performance. High energy consumption procedures such as firing, fumigating and the like are not needed in the production process, and the energy-saving and environment-friendly effects are achieved.
The prepared building material is necessary for people, air pollution is treated, and industrial waste residue can be treated. And the industrial waste residue is used as the raw material, so that the production cost is low.
The wall thickness of an inner hole pore canal of the honeycomb insulating brick is 0.5-3.5mm, and the aperture of the inner hole is 1.5-10 mm; the ratio of the pore diameter of the inner hole of the pore canal to the wall thickness of the pore canal of the inner hole is more than 2.7.
The size of the desulfurizing tower is calculated according to the flow of the flue gas to be treated: the total area of the inner holes of the honeycomb insulating bricks which are arranged in the direction vertical to the flowing direction of the flue gas and can be accommodated is S m2The smoke flow N is X Nm3And S is required to be more than or equal to 0.3m/S and less than or equal to 4.5 m/S.
The number of the tower chamber units in the desulfurizing tower is calculated according to the desulfurizing amount: assuming the total desulfurization amount is A ton, each kiln of the desulfurizing tower can be loaded with Ca (OH)2The weight is B tons, the number of the desulfurizing tower chambers is C, the B × C/A is required to be more than or equal to 30, in order to fully ensure the desulfurizing effect of the desulfurizing tower, the invention is Ca (OH)2The better desulfurization effect can be achieved only by keeping a sufficient excess state all the time.
The invention discloses a method for preparing honeycomb insulating bricks while desulfurizing sulfur-containing flue gas in a desulfurizing tower. When sulfur-containing flue gas passes through the pores of the wet honeycomb insulating brick blank, sulfur dioxide and carbon dioxide in the flue gas are absorbed by slaked lime in the wet honeycomb insulating brick blank to form calcium sulfate and calcium carbonate, and the following reactions occur:
2Ca(OH)2+2SO2+O2＝2CaSO4+2H2O
Ca(OH)2+CO2＝CaCO3+2H2O
only enough tower chamber units are connected in series in the desulfurization tower, and the total amount of unreacted hydrated lime is enough, so that the concentration of sulfur dioxide in the flue gas discharged from the desulfurization tower can be low enough, even can be completely absorbed. Calcium sulfate and calcium carbonate formed in the honeycomb insulating brick after absorption are used as cementing agents, and fly ash is used as a filler, so that the honeycomb insulating brick with high enough mechanical strength is produced. When the honeycomb insulating brick is built, the two ends of the honeycomb insulating brick are filled with cement mortar, so that the pore channels form closed pore channels. The honeycomb brick has the functions of heat preservation and sound insulation due to the closed pore channel structure.
The dry desulfurization method provided by the invention has the advantages of low water consumption, no desulfurization wastewater, no sulfate aerosol and no secondary pollution. And the adopted desulfurizing tower does not need a liquid mobile phase, is not easy to block, and has stable and reliable operation and low maintenance cost.
The number of the tower chamber units connected in series can be increased properly, so that the exhaust emission reaches the national environmental protection standard, and the original desulfurization device does not need to be abandoned and the investment is saved.
The honeycomb insulating brick is produced at ultralow cost while the dry desulfurization is carried out, the three wastes generated by industrial enterprises are fully utilized, and the full utilization of resources is realized.
Drawings
FIG. 1 is a schematic view of a series-connected desulfurizing tower according to the present invention.
Detailed Description
In the following, technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A series-connection type desulfurizing tower comprises a closed kiln body 1, wherein an upper communication pipeline 4 is arranged in the society at the top of the closed kiln body 1, a lower communication pipeline 5 is arranged at the bottom of the closed kiln body 1, the inside of the closed kiln body 1 is divided into a plurality of tower chamber units 2, a blank stack 3 is arranged in each tower chamber unit 2, and each blank stack 3 is a honeycomb insulating brick wet blank stack; the upper communication pipeline 4 and the lower communication pipeline 5 are respectively provided with a plurality of pipeline shutoff valves 6;
the left end of the upper communicating pipeline 4 is provided with a smoke main inlet, and the right end of the lower communicating pipeline 5 is provided with a smoke main outlet.
The adjacent tower room units 2 are separated by partition walls 7, and pipeline cut-off valves 6 are correspondingly arranged above and below each partition wall 7.
And the upper part and the lower part of the tower chamber unit 2 are respectively provided with a tower chamber unit isolating valve 8, and the tower chamber unit 2 is communicated with the upper communicating pipeline 4 and the lower communicating pipeline 5 through the tower chamber unit isolating valves 8.
A dry desulfurization method of a series-connection type desulfurization tower comprises the following steps: (1) preparing a wet blank of the honeycomb insulating brick;
(2) stacking the wet honeycomb insulating brick blanks prepared in the step (1) on air-permeable object placing plates, stacking the air-permeable object placing plates fully filled with the wet honeycomb insulating brick blanks to form a blank stack, placing the blank stack into each tower chamber unit of a desulfurizing tower in a serial connection manner, wherein the difference value between the sulfur dioxide concentration at an inlet and the sulfur dioxide concentration at an outlet of a sulfur-containing flue gas inlet of the tower chamber unit of the desulfurizing tower is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack.
(3) SO at the total outlet of the flue gas on the lower communicating pipeline (5)2When the concentration is higher than the industry standard 2/3, the blank stack with the smallest difference between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the tower chamber unit is taken out, and the new bee blank stack is replaced. And (4) stacking the blanks taken out from the tower chamber unit in the step (3) under natural conditions, and air-drying to form the honeycomb insulating brick.
The wet blank of the honeycomb insulating brick in the step (1) is prepared from the following raw materials: the main materials are hydrated lime and fly ash, the auxiliary materials are talcum powder, dextrin, molasses, waste oil and water, and the weight ratio of the hydrated lime to the fly ash is 0.47: 2.3, the dosage of the talcum powder is 5% of the dry weight of the hydrated lime and the dry weight of the fly ash, the dosage of the dextrin is 20% of the dry weight of the hydrated lime and the dry weight of the fly ash, and the addition amounts of the honey, the waste oil and the water are respectively 2%, 3% and 15% of the total weight of the hydrated lime, the fly ash, the talcum powder and the dextrin. The weight ratio of the hydrated lime to the fly ash is the weight ratio of the dry weight of the hydrated lime to the dry weight of the fly ash. The slaked lime, the fly ash, the talcum powder and the dextrin are used as crushing materials, and the passing rate of a 100-mesh screen is required to be 100%.
The preparation method of the wet blank of the honeycomb insulating brick in the step (1) comprises the following steps: a. mixing slaked lime, fly ash, talcum powder, dextrin, molasses, waste oil and water according to the weight ratio to prepare a mixed paste material;
b. extruding and molding the mixed paste prepared in the step (a) in a honeycomb material extruder to prepare a wet blank of the honeycomb insulating brick; the internal structure and the appearance of the wet blank of the insulating brick are controlled by the design of the die according to the requirement.
c. And (b) during extrusion molding of the mixed paste, placing an air-permeable object placing plate at a discharge port of an extruder, placing an extruded wet blank of the honeycomb insulating brick on the air-permeable object placing plate by an automatic stacker crane, removing the air-permeable object placing plate after one air-permeable object placing plate is full, and simultaneously placing another air-permeable object placing plate to collect the wet blank of the honeycomb insulating brick.
The wall thickness of an inner hole pore passage of the honeycomb insulating brick is 2mm, and the aperture of the inner hole is 5 mm; the ratio of the pore diameter of the inner hole of the pore canal to the wall thickness of the pore canal of the inner hole is more than 2.7.
The size of the desulfurizing tower is calculated according to the flow of the flue gas to be treated: the total area of the inner holes of the honeycomb insulating bricks which are arranged in the direction vertical to the flowing direction of the flue gas and can be accommodated is S m2The smoke flow N is X Nm3And S is required to be more than or equal to 0.3m/S and less than or equal to 4.5 m/S.
The number of the tower chamber units in the desulfurizing tower is calculated according to the desulfurizing amount: assuming the total desulfurization amount is A ton, each kiln of the desulfurizing tower can be loaded with Ca (OH)2The weight is B tons, the number of the desulfurizing tower chambers is C, and B × C/A is required to be more than or equal to 30.
Example 2
A dry desulfurization method of a series-connection type desulfurization tower comprises the following steps: (1) preparing a wet blank of the honeycomb insulating brick;
(2) stacking the wet honeycomb insulating brick blanks prepared in the step (1) on an air-permeable object placing plate, and stacking the air-permeable object placing plates fully filled with the wet honeycomb insulating brick blanks to form blanksStacking, placing the blank stack in each chamber unit of the desulfurizing tower in a serial connection manner, wherein the difference value between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the chamber unit of the desulfurizing tower is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack.
(3) SO at the total outlet of the flue gas on the lower communicating pipeline (5)2When the concentration is higher than the industry standard 2/3, the blank stack with the smallest difference between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the tower chamber unit is taken out, and the new bee blank stack is replaced. And (4) stacking the blanks taken out from the tower chamber unit in the step (3) under natural conditions, and air-drying to form the honeycomb insulating brick.
The wet blank of the honeycomb insulating brick in the step (1) is prepared from the following raw materials: the main materials are hydrated lime and fly ash, the auxiliary materials are talcum powder, dextrin, molasses, waste oil and water, and the weight ratio of the hydrated lime to the fly ash is 0.47: 2.3, the dosage of the talcum powder is 1 percent of the dry weight of the hydrated lime and the dry weight of the fly ash, the dosage of the dextrin is 14 percent of the dry weight of the hydrated lime and the dry weight of the fly ash, and the addition amounts of the honey, the waste oil and the water are respectively 0.5 percent, 1 percent and 10 percent of the total weight of the hydrated lime, the fly ash, the talcum powder and the dextrin. The weight ratio of the hydrated lime to the fly ash is the weight ratio of the dry weight of the hydrated lime to the dry weight of the fly ash. The slaked lime, the fly ash, the talcum powder and the dextrin are used as crushing materials, and the passing rate of a 100-mesh screen is required to be 100%.
The preparation method of the wet blank of the honeycomb insulating brick in the step (1) comprises the following steps: a. mixing slaked lime, fly ash, talcum powder, dextrin, molasses, waste oil and water according to the weight ratio to prepare a mixed paste material;
b. extruding and molding the mixed paste prepared in the step (a) in a honeycomb material extruder to prepare a wet blank of the honeycomb insulating brick; the internal structure and the appearance of the wet blank of the insulating brick are controlled by the design of the die according to the requirement.
c. And (b) during extrusion molding of the mixed paste, placing an air-permeable object placing plate at a discharge port of an extruder, placing an extruded wet blank of the honeycomb insulating brick on the air-permeable object placing plate by an automatic stacker crane, removing the air-permeable object placing plate after one air-permeable object placing plate is full, and simultaneously placing another air-permeable object placing plate to collect the wet blank of the honeycomb insulating brick.
The wall thickness of an inner hole pore passage of the honeycomb insulating brick is 0.5mm, and the aperture of the inner hole is 1.5 mm; the ratio of the pore diameter of the inner hole of the pore canal to the wall thickness of the pore canal of the inner hole is more than 2.7.
The size of the desulfurizing tower is calculated according to the flow of the flue gas to be treated: the total area of the inner holes of the honeycomb insulating bricks which are arranged in the direction vertical to the flowing direction of the flue gas and can be accommodated is S m2The smoke flow N is X Nm3And S is required to be more than or equal to 0.3m/S and less than or equal to 4.5 m/S.
The number of the tower chamber units in the desulfurizing tower is calculated according to the desulfurizing amount: assuming the total desulfurization amount is A ton, each kiln of the desulfurizing tower can be loaded with Ca (OH)2The weight is B tons, the number of the desulfurizing tower chambers is C, B × C/A is required to be more than or equal to 30, and other structures are the same as the embodiment 1.
Example 3
A dry desulfurization method of a series-connection type desulfurization tower comprises the following steps: (1) preparing a wet blank of the honeycomb insulating brick;
(2) stacking the wet honeycomb insulating brick blanks prepared in the step (1) on air-permeable object placing plates, stacking the air-permeable object placing plates fully filled with the wet honeycomb insulating brick blanks to form a blank stack, placing the blank stack into each tower chamber unit of a desulfurizing tower in a serial connection manner, wherein the difference value between the sulfur dioxide concentration at an inlet and the sulfur dioxide concentration at an outlet of a sulfur-containing flue gas inlet of the tower chamber unit of the desulfurizing tower is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack.
(3) SO at the total outlet of the flue gas on the lower communicating pipeline (5)2When the concentration is higher than the industry standard 2/3, the blank stack with the smallest difference between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the tower chamber unit is taken out, and the new bee blank stack is replaced. And (4) stacking the blanks taken out from the tower chamber unit in the step (3) under natural conditions, and air-drying to form the honeycomb insulating brick.
The wet blank of the honeycomb insulating brick in the step (1) is prepared from the following raw materials: the main materials are hydrated lime and fly ash, the auxiliary materials are talcum powder, dextrin, molasses, waste oil and water, and the weight ratio of the hydrated lime to the fly ash is 0.47: 2.3, the dosage of the talcum powder is 9% of the dry weight of the hydrated lime and the dry weight of the fly ash, the dosage of the dextrin is 29% of the dry weight of the hydrated lime and the dry weight of the fly ash, and the addition amounts of the honey, the waste oil and the water are 3%, 1% -4% and 23% of the total weight of the hydrated lime, the fly ash, the talcum powder and the dextrin respectively.
The preparation method of the wet blank of the honeycomb insulating brick in the step (1) comprises the following steps: a. mixing slaked lime, fly ash, talcum powder, dextrin, molasses, waste oil and water according to the weight ratio to prepare a mixed paste material;
b. extruding and molding the mixed paste prepared in the step (a) in a honeycomb material extruder to prepare a wet blank of the honeycomb insulating brick; the internal structure and the appearance of the wet blank of the insulating brick are controlled by the design of the die according to the requirement.
c. And (b) during extrusion molding of the mixed paste, placing an air-permeable object placing plate at a discharge port of an extruder, placing an extruded wet blank of the honeycomb insulating brick on the air-permeable object placing plate by an automatic stacker crane, removing the air-permeable object placing plate after one air-permeable object placing plate is full, and simultaneously placing another air-permeable object placing plate to collect the wet blank of the honeycomb insulating brick.
The wall thickness of an inner hole pore canal of the honeycomb insulating brick is 3.5mm, and the aperture of the inner hole is 10 mm; the ratio of the pore diameter of the inner hole of the pore canal to the wall thickness of the pore canal of the inner hole is more than 2.7.
The size of the desulfurizing tower is calculated according to the flow of the flue gas to be treated: the total area of the inner holes of the honeycomb insulating bricks which are arranged in the direction vertical to the flowing direction of the flue gas and can be accommodated is S m2The smoke flow N is X Nm3And S is required to be more than or equal to 0.3m/S and less than or equal to 4.5 m/S.
The number of the tower chamber units in the desulfurizing tower is calculated according to the desulfurizing amount: assuming the total desulfurization amount is A ton, each kiln of the desulfurizing tower can be loaded with Ca (OH)2The weight is B tons, the number of the desulfurizing tower chambers is C, B × C/A is required to be more than or equal to 30, and other structures are the same as the embodiment 1.

Claims (10)

1. A tandem type desulfurizing tower is characterized in that: the device comprises a closed kiln body (1), wherein an upper communication pipeline (4) is arranged in the society at the top of the closed kiln body (1), a lower communication pipeline (5) is arranged at the bottom of the closed kiln body (1), the inside of the closed kiln body (1) is divided into a plurality of tower chamber units (2), a blank stack is arranged in each tower chamber unit (2), and the blank stack is a wet blank stack of honeycomb insulating bricks; the upper communicating pipeline (4) and the lower communicating pipeline (5) are respectively provided with a plurality of pipeline shutoff valves (6).
2. The tandem desulfurization tower of claim 1, wherein: the left end of the upper communicating pipeline (4) is provided with a smoke main inlet, and the right end of the lower communicating pipeline (5) is provided with a smoke main outlet.
3. The tandem desulfurization tower of claim 1, wherein: the adjacent tower chamber units (2) are separated by partition walls (7), and pipeline cut-off valves (6) are correspondingly arranged above and below each partition wall (7).
4. The tandem desulfurization tower of claim 1, wherein: the tower chamber unit (2) is provided with tower chamber unit isolating valves (8) above and below, and the tower chamber unit (2) is communicated with the upper communicating pipeline (4) and the lower communicating pipeline (5) through the tower chamber unit isolating valves (8).
5. The dry desulfurization method for the desulfurization tower connected in series according to any one of claims 1 to 4, wherein: the method comprises the following steps: (1) preparing a wet blank of the honeycomb insulating brick;
(2) stacking the wet honeycomb insulating brick blanks prepared in the step (1) on air-permeable object placing plates, stacking the air-permeable object placing plates fully filled with the wet honeycomb insulating brick blanks to form a blank stack, placing the blank stack into each tower chamber unit of a desulfurizing tower in a serial connection manner, wherein the difference value between the sulfur dioxide concentration at an inlet and the sulfur dioxide concentration at an outlet of a sulfur-containing flue gas inlet of the tower chamber unit of the desulfurizing tower is not more than 10mg/Nm3In the process, the blank stack in the tower cell unit is taken out and replaced by a new blank stack.
(3) The smoke on the lower communicating pipeline (5) is always dischargedMouth SO2When the concentration is higher than the industry standard 2/3, the blank stack with the smallest difference between the sulfur dioxide concentration at the sulfur-containing flue gas inlet and the sulfur dioxide concentration at the sulfur-containing flue gas outlet of the tower chamber unit is taken out, and the new bee blank stack is replaced.
6. The dry desulfurization method for a desulfurization tower according to claim 5, wherein: the wet blank of the honeycomb insulating brick in the step (1) is prepared from the following raw materials: the main materials are hydrated lime and fly ash, the auxiliary materials are talcum powder, dextrin, molasses, waste oil and water, and the weight ratio of the hydrated lime to the fly ash is 0.47: 2.3, the dosage of the talcum powder is 1-9% of the dry weight of the hydrated lime and the dry weight of the fly ash, the dosage of the dextrin is 14-29% of the dry weight of the hydrated lime and the dry weight of the fly ash, and the addition amounts of the honey, the waste oil and the water are 0.5-3%, 1-4% and 10-23% of the total weight of the hydrated lime, the fly ash, the talcum powder and the dextrin respectively.
7. The dry desulfurization method for a desulfurization tower according to claim 5, wherein: the preparation method of the wet blank of the honeycomb insulating brick in the step (1) comprises the following steps:
a. mixing slaked lime, fly ash, talcum powder, dextrin, molasses, waste oil and water according to the weight ratio to prepare a mixed paste material;
b. extruding and molding the mixed paste prepared in the step (a) in a honeycomb material extruder to prepare a wet blank of the honeycomb insulating brick;
c. and (b) during extrusion molding of the mixed paste, placing an air-permeable object placing plate at a discharge port of an extruder, placing an extruded wet blank of the honeycomb insulating brick on the air-permeable object placing plate by an automatic stacker crane, removing the air-permeable object placing plate after one air-permeable object placing plate is full, and simultaneously placing another air-permeable object placing plate to collect the wet blank of the honeycomb insulating brick.
8. The dry desulfurization method for a desulfurization tower according to claim 6, wherein: the wall thickness of an inner hole pore canal of the honeycomb insulating brick is 0.5-3.5mm, and the aperture of the inner hole is 1.5-10 mm; the ratio of the pore diameter of the inner hole of the pore canal to the wall thickness of the pore canal of the inner hole is more than 2.7.
9. The dry desulfurization method for a desulfurization tower according to claim 5, wherein: the size of the desulfurizing tower is calculated according to the flow of the flue gas to be treated: the total area of the inner holes of the honeycomb insulating bricks which are arranged in the direction vertical to the flow direction of the flue gas is Sm2The smoke flow N is X Nm3And S is required to be more than or equal to 0.3m/S and less than or equal to 4.5 m/S.
10. The dry desulfurization method for a desulfurization tower according to claim 5, wherein: the number of the tower chamber units in the desulfurizing tower is calculated according to the desulfurizing amount: assuming the total desulfurization amount is A ton, each kiln of the desulfurizing tower can be loaded with Ca (OH)2The weight is B tons, the number of the desulfurizing tower chambers is C, and B × C/A is required to be more than or equal to 30.
CN202010617744.3A 2020-07-01 2020-07-01 Series-connection type desulfurizing tower and dry-type desulfurizing method thereof Pending CN111672289A (en)

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