CN111346605B - Pollutant comprehensive treatment system and method suitable for large-scale coal-fired power plant - Google Patents
Pollutant comprehensive treatment system and method suitable for large-scale coal-fired power plant Download PDFInfo
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- CN111346605B CN111346605B CN202010270948.4A CN202010270948A CN111346605B CN 111346605 B CN111346605 B CN 111346605B CN 202010270948 A CN202010270948 A CN 202010270948A CN 111346605 B CN111346605 B CN 111346605B
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Abstract
The invention relates to large-scale smoke pollution treatment in the fields of coal-fired power plant boilers, steel plant sintering machines and the like, in particular to a pollutant comprehensive treatment system and method suitable for large-scale coal-fired power plants. The system comprises an adsorption tower, wherein two groups of movable adsorption layers are arranged in the adsorption tower, and the inside of the adsorption tower is divided into an inner cavity and two outer cavities; the middle part of the outer chamber is provided with a baffle, the inner chamber is provided with an ammonia injection system along the baffle, the inside of the adsorption tower is divided into a denitration section and a desulfurization section from top to bottom, and the outer sides of the movable adsorption layers positioned in the denitration section are respectively provided with a fixed adsorption layer; the outer chamber of the upper section of the adsorption tower is provided with a smoke outlet, and the outer chamber of the lower section is provided with a smoke inlet; the upper end of the movable adsorption layer is provided with an active coke inlet, and the lower end of the movable adsorption layer is provided with an active coke outlet; the boiler flue gas outlet is connected with the flue gas inlet of the adsorption tower, and the flue gas outlet of the adsorption tower is connected with a chimney; the coke making furnace outlet is connected with the active coke inlet of the adsorption tower, the active coke outlet of the adsorption tower is connected with the active coke inlet of the regeneration tower, the outlet of the regeneration tower is connected with the active coke inlet of the adsorption tower, and the flue gas outlet of the regeneration tower is connected with the inlet of the carbothermic reduction tower.
Description
Technical Field
The invention relates to large-scale smoke pollution treatment in the fields of coal-fired power plant boilers, steel plant sintering machines and the like, in particular to a pollutant comprehensive treatment system and method suitable for large-scale coal-fired power plants.
Background
Most of coal-fired power plants in China realize ultra-low emission, and the pollutant treatment reaches the world leading level, but the pollutant treatment system has a single route, wet desulfurization leads to excessive exploitation of limestone resources, and a large amount of inferior gypsum is produced as a byproduct to cause secondary pollution. Meanwhile, china is a large agricultural country, sulfur resources are deficient, the consumption of sulfur reaches 1700 ten thousand tons in 2018 years, and imported sulfur reaches 1100 ten thousand tons. Therefore, a brand new comprehensive pollutant treatment technology which is cooperated with the power production process is developed, so that the recycling of sulfur is realized, and the technology is a direction and a necessary trend of the development of the environment-friendly technology in China.
On the other hand, the pollution treatment level of industries such as metallurgy, coking, industrial boiler (kiln), biomass power plants, garbage incineration power plants and the like is relatively backward, and is the key point of the next environmental treatment in China. The coal-fired power plant generally adopts a limestone-gypsum wet desulfurization, electrostatic precipitation and Selective Catalytic Reduction (SCR) denitration mode at present, has complex process and high investment and operation cost, and is not suitable for popularization and application in small and medium boilers. Meanwhile, the operation condition of the industrial boiler is complex and limited by a temperature window, the conventional SCR and SNCR are difficult to meet the long-term stable operation requirement, and the smoke components of a biomass power plant, a garbage incineration plant and the like are complex, contain a large amount of alkali metal, cause catalyst poisoning, and lead to incapability of using an SCR denitration technology. Therefore, the low-temperature denitration technology is an urgent need for flue gas treatment in the non-electric industry.
The active coke fume comprehensive purifying technology is one advanced fume pollution treating technology. The raw materials are coal, and byproducts can directly enter a boiler for combustion, so that high cooperation with the power production process can be realized. Meanwhile, the method has the advantages of high desulfurization efficiency, low-temperature denitration and high-value utilization of sulfur resources, does not have visual pollution such as smoke plume phenomenon, and is the most promising pollution control substitute at presentAnd (5) replacing the process. Up to now, there are 30 running achievements, the maximum scale is 600m in Taiyuan iron and steel works 2 A sintering machine.
The existing active coke flue gas purification technology adopts cylindrical active coke, has complex preparation process, is not suitable for in-situ preparation, has high cost and poor desulfurization and denitrification performance, and leads to high investment and operation cost of the whole process. The cylindrical active coke adopted in the existing active coke combined desulfurization and denitrification process is poor in quality, and the active coke is mostly adsorbed by a moving bed, so that the denitration and dust removal performances are unstable, and the ultra-low emission requirements cannot be met under partial working conditions. The existing active coke combined desulfurization and denitrification process generally uses SO 2 The concentrated sulfuric acid is prepared by catalytic oxidation, so that the amount is large, the quality is low, the storage and the transportation are inconvenient, and the popularization and the application of the active coke combined desulfurization and denitrification technology in coal-fired power plants are further limited.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method for preparing the unshaped active coke by adopting the raw coal one-step method, which improves the performance of the active coke, reduces the cost, further improves the denitration and dust removal performance by adopting a moving bed and fixed bed combined adsorption tower, and simultaneously adopts carbothermic reduction to reduce SO 2 The method is convenient to store and transport, realizes high-value utilization of sulfur resources, effectively solves the problems of high investment and operation cost of the existing active coke combined desulfurization and denitrification technology, and meets the environmental protection technology upgrading requirement of the coal-fired power plant.
The invention is realized by the following technical scheme:
a pollutant comprehensive treatment system suitable for a large-scale coal-fired power plant comprises a regeneration tower, a coke oven and a carbothermic reduction tower, and an adsorption tower and a chimney which are sequentially connected to a boiler flue outlet;
two groups of movable adsorption layers which are communicated up and down and are arranged in parallel are arranged in the adsorption tower, so that the inside of the adsorption tower is horizontally divided into an inner cavity and two outer cavities; the middle part of the outer chamber is provided with a baffle, the inner chamber is provided with an ammonia injection system along the position of the baffle, the inside of the adsorption tower is divided into a denitration section of an upper section and a desulfurization section of a lower section, and the outer sides of the movable adsorption layers positioned in the denitration section are respectively provided with a fixed adsorption layer; the outer chamber of the upper section of the adsorption tower is provided with a smoke outlet, and the outer chamber of the lower section is provided with a smoke inlet; the upper end of the movable adsorption layer is provided with an active coke inlet, and the lower end of the movable adsorption layer is provided with an active coke outlet;
the flue gas outlet of the boiler is connected with the flue gas inlet of the adsorption tower, and the flue gas outlet of the adsorption tower is connected with a chimney;
the outlet of the coke making furnace is connected with the active coke inlet of the adsorption tower, the active coke outlet of the adsorption tower is connected with the inlet of the regeneration tower, the outlet of the regeneration tower is connected with the active coke inlet of the adsorption tower, and the flue gas outlet of the regeneration tower is connected with the inlet of the carbon thermal reduction tower.
Further, the movable adsorption layer adopts unshaped active coke prepared by a coke oven and/or regenerated by a regeneration tower for one-time denitration and desulfurization; the fixed adsorption layer adopts modified active coke for secondary denitration.
Further, the active coke outlet of the adsorption tower and the inlet of the regeneration tower are provided with a first chain bucket machine, and the active coke inlet of the adsorption tower and the outlet of the regeneration tower are provided with a second chain bucket machine.
Further, the input end of the ammonia injection system is sequentially connected with an evaporator and an ammonia tank; and a dust remover and a draught fan are sequentially connected between the flue gas outlet of the boiler and the flue gas inlet of the adsorption tower.
Further, the coke oven is internally divided into a carbonization section and an activation section from top to bottom, the top is provided with a storage bin section communicated with the carbonization section, and the bottom is provided with a cooling section communicated with the activation section; the bottom of the cooling section is provided with a discharge opening;
the top of the carbonization section is provided with a raw material inlet and a coal gas outlet; the raw material inlet is connected with a discharge hole of the stock bin section through a material sliding pipe;
the inside of the activation section is provided with a multi-layer injection system, and the furnace wall of the activation section is provided with a high-temperature steam inlet connected with the multi-layer injection system; the high-temperature steam inlet is also communicated with a post-combustion air pipe; the multi-layer spraying system comprises a plurality of spraying units which are arranged in the activation section from top to bottom at intervals.
Further, a feeding valve is arranged on the chute; the cooling section inside set up circulating cooling water pipe, the discharge opening of cooling section is the toper, the bottom is provided with the discharge valve.
A pollutant comprehensive treatment method suitable for a large-scale coal-fired power plant comprises the following steps:
raw coal is utilized; part of raw coal stored in a coal yard is sent to a boiler to burn and generate electricity to generate smoke, and the other part of raw coal is crushed and then sent to a coke making furnace to prepare unshaped active coke;
desulfurizing and denitrating flue gas; flue gas generated by boiler combustion is sent into an adsorption tower, horizontally enters an inner chamber after being desulfurized by a movable adsorption layer of a desulfurization section from an outer chamber of a lower section, rises in the inner chamber, is catalyzed by ammonia spraying of an ammonia spraying system, then horizontally enters an outer chamber of an upper section after being denitrated by a movable adsorption layer and a fixed adsorption layer of a denitration section in sequence, and is discharged through a chimney after being collected;
regenerating the unshaped active coke; the adsorption saturated unshaped active coke enters a regeneration tower, the active coke is heated to about 400 ℃ to realize regeneration and generate high-concentration SO with the concentration of 10-20 percent 2 A gas;
curing sulfur; regeneration of produced high concentration SO 2 The gas enters a carbothermic reduction tower to reduce SO 2 Reducing into sulfur.
Further, the step of preparing the unshaped active coke in the coke making furnace is as follows,
step 1, raw materials adopted in coke making are sent into a bin section, then enter a coke making furnace carbonization section through a chute, gas is generated in the coke making furnace carbonization section, the generated gas is led out through a gas outlet, and the rest materials enter an activation section from top to bottom;
step 2, mixing the high-temperature steam and the afterburning air, entering a multi-layer injection system to form a high-temperature steam flow from top to bottom, directly contacting with materials entering an activation section from top to bottom, and heating and carbonizing the materials to form active coke;
and 3, enabling the active coke to enter a cooling section, indirectly contacting with a circulating cooling water pipe in the cooling section, and cooling the obtained unshaped active coke.
Further, raw materials adopted in the coke making are raw coal, the grain diameter is 4-15 mm, the sulfur content is less than 1%, and the ash content is less than 8%; the activation process in the activation section is activated by high-temperature steam, and the steam is heated to 800-900 ℃ before entering the activation section.
Further, dead coke generated during desulfurization and denitrification in the movable adsorption layer of the adsorption tower is used as a reducing agent in the carbothermic reduction tower, and SO is treated 2 Reducing into sulfur.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the amorphous active coke is prepared by adopting carbonization and activation integrated equipment, namely the amorphous active coke is further prepared by carbonization and activation in the coke making furnace, the whole preparation process is simple, the investment cost is low, the in-situ preparation of the active coke can be realized, and the coke preparation cost is only one third of the original cost, so that the operation cost of the active coke combined desulfurization and denitrification process is greatly reduced.
The invention adopts the unshaped raw coal as the raw material, the prepared active coke retains the meso-macroporous structure of the raw coal, and combines with the microporous structure prepared in the activation process to form the dendritic pore structure, thus being suitable for SO 2 、NO x The diffusion and adsorption of the isogas molecules and the removal effect are obviously better than that of the existing active coke; meanwhile, compared with the existing active coke combined desulfurization and denitrification process, the reaction time is reduced, and the active coke loading is reduced, so that the equipment investment cost is reduced.
According to the invention, the movable adsorption layer is adopted as a moving bed and the fixed adsorption layer is adopted as an adsorption tower system combined with a fixed bed, and the denitration fixing section adopts modified active coke, so that the denitration performance is improved, and meanwhile, the fixing section plays a role in intercepting secondary dust, so that the denitration and dust removal capabilities of the system are improved, and the ultra-low emission requirement is met.
The invention adopts cheap spent coke as the reducing agent to treat SO 2 Reducing into sulfur to realize SO 2 High-value utilization, reduced sulfur recovery cost, and convenient storage and transportation.
Drawings
FIG. 1 is a schematic diagram of a abatement system of the present invention;
fig. 2 is a schematic view of the structure of the coke oven of the present invention.
In the figure: coal yard 1, boiler 2, dust collector 3, induced draft fan 4, adsorption tower 5, mobile adsorption layer 51, inner chamber 52, outer chamber 53, ammonia injection system 54, fixed adsorption layer 55, regeneration tower 6, coke oven 7, bin section 71, chute 72, feed valve 73, carbonization section 74, activation section 75, multi-layer injection system 76, cooling section 77, circulating cooling water pipe 78, discharge valve 79, gas outlet 710, carbothermic reduction tower 8, chimney 9, first bucket machine 10, second bucket machine 11, ammonia tank 12, evaporator 13.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
Example 1
As shown in figure 1, the pollutant comprehensive treatment system suitable for large-scale coal-fired power plants comprises a coal yard 1, wherein raw coal stored in the coal yard 1 is mainly used for combustion power generation of a boiler 2, and a small part of raw coal is crushed and enters a coke making furnace 7 to be made into unshaped active coke which is loaded into an adsorption tower 5;
flue gas generated by combustion of the boiler 2 is sent into the adsorption tower 5 through the induced draft fan 4 after dust removal by the dust remover 3 arranged between the flue gas outlet of the boiler 2 and the flue gas inlet of the adsorption tower 5; the adsorption tower 5 adopts a sectional type, the lower section is a desulfurization section, the upper section is a denitration section, an ammonia injection system 54 is arranged between the two sections, the ammonia injection system is sequentially connected with the evaporator 13 and the ammonia tank 12, and SO is realized through the adsorption and catalysis of active coke 2 、NO x The integrated removal of various pollutants such as Hg and the like enters a chimney 9 for emission;
the activated coke with saturated adsorption enters a regeneration tower 6, the activated coke is heated to about 400 ℃ to realize regeneration, and a first chain bucket machine 10 and a second chain bucket machine 11 are arranged between the adsorption tower 5 and the regeneration tower 6 and are used for transferring the activated coke. High concentration (10% -20%) SO produced by regeneration 2 The gas enters a carbothermic reduction tower 8 to react with spent coke generated in the combined desulfurization and denitrification process to remove SO 2 Reducing into sulfur.
As a preferred embodiment of the invention, the coke making process is a one-step method for preparing the unshaped active coke, namely, raw coal particles with fixed size are adopted to carbonize and activate the unshaped active coke in one step in the coke making furnace 7, and the particle size of the active coke is 4-15 mm. As shown in fig. 2, the inside of the coke oven 7 is divided into a carbonization section 74 and an activation section 75 from top to bottom, the top is provided with a storage bin section 71 communicated with the carbonization section 74, and the bottom is provided with a cooling section 77 communicated with the activation section 75; the bottom of the cooling section 77 is provided with a discharge port; the top of the carbonization section 74 is provided with a raw material inlet and a gas outlet 710; the raw material inlet is connected with a discharge hole of the stock bin section 71 through a chute 72; a multi-layer injection system 76 is arranged in the activation section 75, and a high-temperature steam inlet connected with the multi-layer injection system 76 is arranged on the furnace wall of the activation section 75; the high-temperature steam inlet is also communicated with a post-combustion air pipe; the multi-layer injection system 76 includes a plurality of injection units disposed in the activation section 75 at intervals from top to bottom.
Wherein a feed valve 73 is arranged on the chute 72; the cooling section 77 is internally provided with a circulating cooling water pipe 78, the discharge opening of the cooling section 77 is conical, and the bottom end of the cooling section is provided with a discharge valve 79.
As a preferred embodiment of the present invention, the adsorption tower 5 adopts a moving adsorption layer 51 as a moving bed and a fixed adsorption layer 55 as a fixed bed adsorption process, the adsorption tower 5 is divided into an upper section and a lower section, the lower section is a desulfurization section, the upper section is a denitration section, an ammonia injection system 54 is arranged between the desulfurization and denitration sections, specifically, as shown in fig. 1, two groups of moving adsorption layers 51 which are vertically through and are arranged in parallel are arranged in the adsorption tower 5, and the inside of the adsorption tower 5 is horizontally divided into an inner chamber 52 and two outer chambers 53; the middle part of the outer chamber 53 is provided with a baffle, the inner chamber 52 is provided with an ammonia injection system 54 along the position of the baffle, the inside of the adsorption tower 5 is divided into a denitration section of an upper section and a desulfurization section of a lower section, and the outer sides of the movable adsorption layers 51 positioned in the denitration section are respectively provided with a fixed adsorption layer 55; the outer chamber of the upper section of the adsorption tower 5 is provided with a flue gas outlet, and the outer chamber of the lower section is provided with a flue gas inlet; the upper end of the movable adsorption layer 51 is provided with an active coke inlet, and the lower end is provided with an active coke outlet; the denitration section is divided into a movable type based on the movable adsorption layer 51 and a fixed type based on the fixed adsorption layer 55, wherein the movable denitration section is communicated with the desulfurization section, and is prepared from common amorphous active coke, and the fixed denitration section is prepared from modified active coke and is used for deep denitration and dust removal.
The system is suitable for large-scale flue gas pollutant treatment of coal-fired power plants or steel mill sintering machines and the like, the produced activated coke has the characteristics of medium-large pore access and developed micropores, the desulfurization and denitrification performance is obviously superior to that of commercial activated coke, and the production cost of the desulfurization and denitrification activated coke is greatly reduced; the combined adsorption system of the moving bed and the fixed bed improves the denitration and dust removal performance of the system and meets the ultra-low emission requirement; according to the invention, the carbon thermal reduction is adopted to prepare the sulfur, so that the sulfur recovery cost is reduced, the high-value utilization of sulfur resources is realized, and the storage and the transportation are convenient; lays a foundation for the large-scale application of the active coke combined desulfurization and denitrification technology.
Example 2
A pollutant comprehensive treatment method suitable for a large-scale coal-fired power plant comprises the following steps:
raw coal is utilized; part of raw coal stored in the coal yard 1 is sent to a boiler 2 to be burnt and generated to generate smoke, and the other part of raw coal is sent to a coke oven 7 to be made into unshaped active coke after being crushed;
desulfurizing and denitrating flue gas; flue gas generated by combustion of the boiler 2 is sent into the adsorption tower 5, horizontally enters the inner chamber 52 after being desulfurized by the outer chamber 53 of the lower section through the movable adsorption layer 51 of the desulfurization section, rises in the inner chamber 52 and is catalyzed by ammonia spraying through the ammonia spraying system 54, then horizontally enters the outer chamber 53 of the upper section after being denitrated by the movable adsorption layer 51 and the fixed adsorption layer 55 of the denitration section in sequence, and is discharged through the chimney 9 after being collected;
regenerating the unshaped active coke; the adsorption saturated unshaped active coke enters a regeneration tower 6, the active coke is heated to about 400 ℃ to realize regeneration and generate high-concentration SO with the concentration of 10-20 percent 2 A gas;
curing sulfur; regeneration of produced high concentration SO 2 The gas enters a carbothermic reduction tower 8 to carry out SO 2 Reducing into sulfur.
Wherein, the step of preparing the unshaped active coke in the coke oven 7 is as follows,
step 1, raw materials adopted in coke making are sent into a bin section 71, then enter a coke making furnace carbonization section 74 through a chute 72, gas is generated in the coke making furnace carbonization section 74, the generated gas is led out through a gas outlet 710, and the rest materials enter an activation section 75 from top to bottom;
step 2, mixing the high-temperature steam and the afterburning air, entering a multi-layer injection system 76 to form a high-temperature steam flow from top to bottom, directly contacting the materials entering an activation section 75 from top to bottom, and heating and carbonizing the materials to form active coke;
and 3, enabling the active coke to enter a cooling section 77, indirectly contacting with a circulating cooling water pipe 78 in the cooling section 77, and cooling the obtained unshaped active coke.
Wherein, raw materials adopted for preparing the coke are raw coal, the grain diameter is 4-15 mm, the sulfur content is less than 1%, and the ash content is less than 8%; the activation process in the activation section 75 is activated with high temperature steam, which is heated to 800-900 ℃ before entering the activation section 75.
Wherein, spent coke generated when the adsorption tower 5 moves the adsorption layer 51 for desulfurization and denitrification is used as a reducing agent in the carbothermic reduction tower 8, SO is treated 2 Reducing into sulfur.
Claims (10)
1. The pollutant comprehensive treatment system suitable for the large-scale coal-fired power plant is characterized by comprising a regeneration tower (6), a coke making furnace (7) and a carbothermic reduction tower (8), and an adsorption tower (5) and a chimney (9) which are sequentially connected to a flue outlet of a boiler (2);
two groups of movable adsorption layers (51) which are communicated up and down and are arranged in parallel are arranged in the adsorption tower (5), and the inside of the adsorption tower (5) is horizontally divided into an inner chamber (52) and two outer chambers (53); the middle part of the outer chamber (53) is provided with a baffle, the inner chamber (52) is provided with an ammonia injection system (54) along the position of the baffle, the inside of the adsorption tower (5) is divided into a denitration section of an upper section and a desulfurization section of a lower section, and the outer sides of the movable adsorption layers (51) positioned in the denitration section are respectively provided with a fixed adsorption layer (55); the outer chamber of the upper section of the adsorption tower (5) is provided with a smoke outlet, and the outer chamber of the lower section is provided with a smoke inlet; the upper end of the movable adsorption layer (51) is provided with an active coke inlet, and the lower end of the movable adsorption layer is provided with an active coke outlet;
the flue gas outlet of the boiler (2) is connected with the flue gas inlet of the adsorption tower (5), and the flue gas outlet of the adsorption tower (5) is connected with the chimney (9);
the outlet of the coke making furnace (7) is connected with the active coke inlet of the adsorption tower (5), the active coke outlet of the adsorption tower (5) is connected with the inlet of the regeneration tower (6), the outlet of the regeneration tower (6) is connected with the active coke inlet of the adsorption tower (5), and the flue gas outlet of the regeneration tower (6) is connected with the inlet of the carbothermic reduction tower (8);
the inside of the coke making furnace (7) is divided into a carbonization section (74) and an activation section (75) from top to bottom, the top of the carbonization section (74) is provided with a raw material inlet and a coal gas outlet (710), the inside of the activation section (75) is provided with a multi-layer injection system (76), and the furnace wall of the activation section (75) is provided with a high-temperature steam inlet connected with the multi-layer injection system (76); the high-temperature steam inlet is also communicated with a post-combustion air pipe;
the raw material for preparing the unshaped active coke by the coke making furnace (7) is raw coal, the grain diameter is 4-15 mm, the sulfur content is less than 1%, and the ash content is less than 8%;
spent coke produced by the moving adsorption layer (51) is used as a reducing agent in a carbothermic reduction tower (8).
2. The pollutant comprehensive treatment system suitable for large-scale coal-fired power plants according to claim 1, wherein the movable adsorption layer (51) adopts unshaped active coke prepared by a coke making furnace (7) and/or regenerated by a regeneration tower (6) for one-time denitration and desulfurization; the fixed adsorption layer (55) adopts modified active coke for secondary denitration.
3. The comprehensive pollutant treatment system suitable for the large-scale coal-fired power plant according to claim 1, wherein a first bucket conveyor (10) is arranged at an active coke outlet of the adsorption tower (5) and an inlet of the regeneration tower (6), and a second bucket conveyor (11) is arranged at an active coke inlet of the adsorption tower (5) and an outlet of the regeneration tower (6).
4. The comprehensive pollutant treatment system suitable for the large-scale coal-fired power plant according to claim 1, wherein the input end of the ammonia injection system (54) is sequentially connected with an evaporator (13) and an ammonia tank (12); the dust remover (3) and the induced draft fan (4) are sequentially connected between the flue gas outlet of the boiler (2) and the flue gas inlet of the adsorption tower (5).
5. The comprehensive pollutant treatment system suitable for the large-scale coal-fired power plant according to claim 1, wherein the top of the coke making furnace (7) is provided with a storage bin section (71) communicated with a carbonization section (74), and the bottom of the coke making furnace is provided with a cooling section (77) communicated with an activation section (75); a discharge opening is arranged at the bottom of the cooling section (77);
the raw material inlet is connected with a discharge hole of the stock bin section (71) through a chute (72);
the multi-layer spray system (76) comprises a plurality of spray units which are arranged in the activation section (75) from top to bottom at intervals.
6. The comprehensive pollutant treatment system for large-scale coal-fired power plants according to claim 5, wherein a feed valve (73) is arranged on the chute (72); the cooling section (77) is internally provided with a circulating cooling water pipe (78), the discharge opening of the cooling section (77) is conical, and the bottom end of the cooling section is provided with a discharge valve (79).
7. A method for comprehensive treatment of pollutants suitable for large coal-fired power plants, based on the system according to any of claims 1-6, characterized in that it comprises:
raw coal is utilized; part of raw coal stored in the coal yard (1) is sent to a boiler (2) for combustion and power generation to generate smoke, and the other part of raw coal is sent to a coke making furnace (7) after being crushed to prepare unshaped active coke;
desulfurizing and denitrating flue gas; flue gas generated by combustion of the boiler (2) is sent into an adsorption tower (5), horizontally enters an inner chamber (52) after being desulfurized by an outer chamber (53) of the lower section through a movable adsorption layer (51) of a desulfurization section, rises in the inner chamber (52) and is catalyzed by ammonia spraying through an ammonia spraying system (54), then horizontally enters an outer chamber (53) of the upper section after being subjected to denitration by the movable adsorption layer (51) and a fixed adsorption layer (55) of a denitration section in sequence, and is discharged through a chimney (9) after being collected;
regenerating the unshaped active coke; the amorphous active coke with saturated adsorption enters a regeneration tower (6) and is heated to about 400 ℃ to realizeRegenerating and producing high-concentration SO with concentration of 10% -20% 2 A gas;
curing sulfur; regeneration of produced high concentration SO 2 The gas enters a carbothermic reduction tower (8) to carry out SO 2 Reducing into sulfur.
8. The method for comprehensively treating pollutants for large-scale coal-fired power plants according to claim 7, wherein the step of preparing the unshaped active coke in the coke making furnace (7) is as follows,
step 1, raw materials adopted in coke making are sent into a bin section (71), then enter a coke making furnace carbonization section (74) through a chute (72), gas is generated in the coke making furnace carbonization section (74), the generated gas is led out through a gas outlet (710), and the rest materials enter an activation section (75) from top to bottom;
step 2, mixing the high-temperature steam and the afterburning air, entering a multi-layer injection system (76) to form a high-temperature steam flow from top to bottom, directly contacting the materials entering an activation section (75) from top to bottom, and heating and carbonizing the materials to form active coke;
and 3, enabling the active coke to enter a cooling section (77), indirectly contacting with a circulating cooling water pipe (78) in the cooling section (77), and cooling the obtained unshaped active coke.
9. The comprehensive treatment method for pollutants suitable for large-scale coal-fired power plants according to claim 7, wherein raw materials adopted for coke making are raw coal with the particle size of 4-15 mm, the sulfur content is less than 1%, and the ash content is less than 8%; the activation process in the activation section (75) adopts high-temperature steam for activation, and the steam is heated to 800-900 ℃ before entering the activation section (75).
10. The method for comprehensive treatment of pollutants for large-scale coal-fired power plants according to claim 7, wherein spent coke generated during desulfurization and denitrification in the moving adsorption layer (51) of the adsorption tower (5) is used as a reducing agent in the carbothermic reduction tower (8) to treat SO 2 Reducing into sulfur.
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