CN109929640B - Method and system for producing clean coal by power plant power generation coupling - Google Patents
Method and system for producing clean coal by power plant power generation coupling Download PDFInfo
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Abstract
The invention relates to the field of power plant power generation and clean coal production coupling, and discloses a method and a system for producing clean coal by power plant power generation coupling. The method comprises the following steps: (1) directly heating raw coal by using first flue gas at 800-1200 ℃ from a power plant boiler to perform coal conversion, wherein the final conversion temperature of the coal conversion is 500-640 ℃, and the conversion time is 10-60 min, so as to obtain first raw coke oven gas and converted coal; (2) directly heating the converted coal by using 800-1200 ℃ second flue gas from a power plant boiler to remove impurities from the coal, wherein the final impurity removal temperature of the coal is 650-750 ℃, and the impurity removal time is 10-60 min, so as to obtain second raw gas and removed coal; (3) the first crude gas and the second crude gas are converged and then tar is removed to obtain tar and gas; the coal gas returns to a burner of a boiler of the power plant in a return air mode for generating power; (4) and (5) carrying out dry cooling on the impurity-removed coal to obtain clean coal. The normal power generation production of the power plant is realized, and meanwhile, the low-rank raw coal is produced into clean coal.
Description
Technical Field
The invention relates to the field of power plant power generation and clean coal production coupling, in particular to a method and a system for producing clean coal by power plant power generation coupling.
Background
China dominates the consumption of coal in energy consuming structures. Where coal-fired power generation is the primary form of coal consumption. However, due to the emission of pollutants generated by coal combustion and the influence of coal price, the power generation production of coal-fired thermal power plants has operational loss in recent years, the load rate of the coal-fired power plants is integrally low, and the sustainable development of the power generation industry is restricted.
In addition, the smoke emission generated in the coal burning process is an important reason for causing haze. In recent years, the Jingjin Ji area is the most serious area of air pollution in China, and 8 cities in the first 10 highest pollution nationwide are in the Jingjin Ji area. In order to solve the increasingly severe atmospheric pollution problem in Jingjin Ji areas, the nation has successively developed policy documents to develop action for treating the atmospheric environment. Compared with coal-fired power plants, about 3 hundred million tons of civil scattered-fired coal has poor coal quality and great difficulty in pollutant control, and is known as 'cancer' which is difficult to cure in the field of air pollution treatment. Therefore, the scattered coal is urgently cleaned.
Therefore, power plant power generation production and loose coal cleaning become the focus of development attention of current coal and power generation enterprises.
CN106382790A discloses a lignite drying method by using flue gas and steam waste heat of a power plant, which comprises the following steps: (1) carrying out primary drying treatment on the wet material by using high-temperature flue gas directly discharged by a coal-fired boiler of a power plant; the high-temperature flue gas is directly and uniformly contacted with the wet material to obtain an intermediate material; (2) then high-temperature flue gas and steam directly discharged by a coal-fired boiler of a power plant are utilized to simultaneously carry out secondary drying treatment on the intermediate material; the high-temperature flue gas directly and evenly contacts with the intermediate material, and the intermediate material and the heat exchange tube which is communicated with the steam are evenly contacted for heat exchange to obtain a dry material, so that secondary drying treatment is realized. The method can only realize the combination of flue gas of a power plant and the drying of coal, but does not suggest how to solve the problem of the combination of the power plant and the production of clean coal.
CN102350214A discloses a coal-fired power plant pulverized coal preparation active coke flue gas comprehensive purification process, which comprises the following steps: 1) the pulverized coal in the pulverized coal storage tank is carried by compressed air and is pumped into the carbonization and activation furnace by the pulverized coal bin pump, meanwhile, smoke with the temperature of 500-1200 ℃ is extracted from the pulverized coal bin to be used as a pulverized coal carbonization heat source and an activating agent and is sent to the bottom of the active coke activation furnace to be mixed with the pulverized coal, the smoke carries the pulverized coal to move from bottom to top, and carbonization and activation reactions are carried out simultaneously to obtain powdery active coke; 2) the flue gas carries active coke to enter a separator to realize gas-solid separation, and the separated active coke is cooled by a cooler and then is sent to an active coke storage tank by an active coke bin pump II to be stored; the pyrolysis gas separated by the separator is used as reburning fuel and sent to the reduction zone of the boiler, and NO generated in the main combustion zone isxReduction to N2Realization of NOxPartial removal of (2); 3) the flue gas discharged from the boiler is treated by a pre-deduster and then enters an adsorption tower, and is fully mixed with the active coke fed from the active coke storage tank in the adsorption tower; pumping water in the process water tank by a water pump, spraying the water into the adsorption tower through a nozzle, adjusting the temperature of the flue gas, and controlling the SO in the flue gas at 60-120 DEG C2And mercury is adsorbed by the activated coke; the ammonia gas in the ammonia gas storage tank is extracted by the ammonia gas conveying fan and sprayed into the ammonia gas through an ammonia gas nozzle at the upper part of the adsorption tower, and the ammonia gas and NO in the smoke gasxOxidation reduction reaction to generate N2Realization of NOxRemoving; 4) the purified flue gas enters a cloth bag separator for gas-solid separation, the purified gas is sent to a chimney by a draught fan and directly discharged to the atmosphere, one part of the separated active coke is sent to an adsorption tower by a screw feeder to participate in circulation, and the other part of the separated active coke is sent to a regeneration furnace for regeneration; 5) the regenerated active coke is cooled by a cooler II and then is sent to an active coke storage tank by an active coke bin pump I for cyclic utilization; sulfur dioxide enriched gas with the concentration of 20-60% is obtained in the regeneration process, so that the resource utilization of sulfur dioxide is realized; 6) the active coke loses the adsorption performance after being adsorbed/regenerated for a plurality of times, and the waste active coke losing the adsorption performance is sent to a boiler for combustion, so that the energy of the active coke is fully utilized. The method is used for solving the problem of smoke in the power plantAnd (3) pollutant emission of gas, namely preparing active coke from coal by using flue gas, and reducing the pollutant emission of the flue gas by using the active coke and the generated pyrolysis gas. There is no reference and suggestion on how to produce clean coal by using flue gas of a power plant, and the technical problems exist.
US20170137731a1 discloses a method for upgrading coal by heating the coal twice in the absence of oxygen to remove moisture and by-products contained in the coal and upgrade the coal to obtain upgraded coal; meanwhile, the by-product discharged circularly is burnt to be used as a heat source for heating the coal, so that energy is saved. The first heating is about 400F (204℃), and the second heating is about 1500F (815.6C). The method only discloses a method for producing raw coal into clean coal, but does not relate to the combination of power plant flue gas and clean coal production and the technical problems encountered in the combination process.
CN10664459A discloses a multistage rotary coal pyrolysis processing technology, which comprises the following steps: (1) feeding raw material coal with the granularity of 3-30mm into a dry rotary furnace to directly exchange heat with hot flue gas with the temperature lower than 300 ℃ for dehydration, wherein the final drying temperature is 200-250 ℃; (2) feeding the dried coal material into a pyrolysis rotary furnace, wherein the coal material is indirectly heated by heat provided by the pyrolysis heating furnace and decomposed to generate granular semicoke, tar steam and coal gas, and the final pyrolysis temperature is 500-650 ℃; (3) sending the mixed gas of tar steam and coal gas to a condenser for separation to obtain crude tar and coal gas; (4) feeding the granular semi-coke into a recarburization rotary furnace, and carrying out internal heating at the temperature of 800-850 ℃ to obtain granular coke and high-temperature mixed gas, wherein the mixed gas is introduced into a pyrolysis heating furnace; (5) and spraying water on the vibrating screen to quench the granular coke discharged from the carburizing rotary furnace to obtain the product coke. The process carries out the pyrolysis processing of coal, adopts a multi-stage series rotary furnace and a sectional heating mode, wherein hot flue gas discharged by a pyrolysis heating furnace is taken as a drying medium in a drying section, the pyrolysis heating furnace provides heat required by pyrolysis in a pyrolysis section, and the heat is generated by burning air, pyrolysis coal gas or other fuels in the heating furnace. The process is used for producing coke, tar and coal gas by coal pyrolysis, and does not relate to the problems of how to jointly produce clean coal by using flue gas of a power plant and how to stabilize power generation production of the power plant.
In view of the above, the methods disclosed in the prior art do not consider how to combine the flue gas of the power plant with the clean coal production, and it is necessary to provide a method for balancing the power generation production of the power plant and the clean coal production.
Disclosure of Invention
The invention aims to solve the problem of how to realize the combination of power generation of a power plant and clean coal production and balance the stable production of the power generation and the clean coal, and provides a method and a system for producing clean coal by coupling power generation of the power plant, which can realize the production of clean coal by using hot flue gas of the power plant without influencing the power generation production of the power plant, not only can use flue gas of a coal-fired power plant to process inferior coal to produce clean coal, but also can use crude gas generated by the production of the clean coal to extract tar, and then return the coal gas to the power plant for power generation, thereby reducing the coal consumption of the power plant; the construction of a heat source for producing clean coal and a purification treatment device for the produced coal gas can be saved, the process is simplified, the construction investment of a civil bulk coal cleaning project is reduced, and the synergistic benefits of a power plant and the production of the clean coal are brought into play; coal tar can also be obtained.
In order to achieve the above object, a first aspect of the present invention provides a method for producing clean coal by power plant power generation coupling, comprising:
(1) directly heating raw coal by using first flue gas at 800-1200 ℃ from a power plant boiler to perform coal conversion, wherein the final conversion temperature of the coal conversion is 500-640 ℃, and the conversion time is 10-60 min, so as to obtain first raw coke oven gas and converted coal;
(2) directly heating the converted coal by using 800-1200 ℃ second flue gas from a power plant boiler to remove impurities from the coal, wherein the final impurity removal temperature of the coal is 650-750 ℃, and the impurity removal time is 10-60 min, so as to obtain second raw gas and removed coal;
(3) the first crude gas and the second crude gas are converged and then tar is removed to obtain tar and gas; the coal gas returns to a burner of a boiler of the power plant in a return air mode for generating power;
(4) and (5) carrying out dry cooling on the impurity-removed coal to obtain clean coal.
Preferably, the temperature of the first flue gas and the second flue gas is 900-1000 ℃.
Preferably, the total flow rate of the first flue gas and the second flue gas is 1-30 vol%, preferably 5-20 vol%, and more preferably 5-10 vol% of the total flow rate of the flue gases generated by the power plant boiler.
Preferably, the volume ratio between the first flue gas and the second flue gas is (1-4): 1, preferably (1-2): 1.
preferably, relative to 10000Nm3The total flow rate of the first flue gas and the second flue gas, the feeding amount of the raw coal is 3000-6000 kg, and preferably 4000-5000 kg.
Preferably, the ratio of the conversion time to the impurity removal time is (1-2): 1.
preferably, the temperature of the return air is 300-500 ℃, and preferably 350-450 ℃; the flow rate of the return air is 100-130% by volume, preferably 100-120% by volume, and more preferably 105-120% by volume of the total flow rate of the first flue gas and the second flue gas.
Preferably, the raw coal is at least one of lignite with the particle size of 1-100 mm, long flame coal and non-caking coal.
The invention provides a system for applying the method for producing clean coal by coupling power generation of the power plant, which comprises the following steps: the system comprises a power plant boiler 1, a raw coal impurity removal unit, a condenser 7, a dry cooling device 5 and an air inducing device 6;
the raw coal impurity removal unit is used for directly contacting flue gas from a power plant boiler 1 with raw coal to remove impurities in the raw coal, so as to obtain raw coke oven gas and removed coal;
the dry cooling device 5 is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal;
the condenser 7 is used for separating tar and coal gas from the raw coal impurity removal unit to obtain tar;
the air guiding device 6 is used for returning the gas from the condenser 7 to the burner 2 of the power plant boiler in the form of return air.
Preferably, the raw coal impurity removal unit comprises a conversion device 3 and an impurity removal device 4, wherein the conversion device 3 is communicated with the power plant boiler 1, the impurity removal device 4 and the condenser 7; the impurity removing device 4 is communicated with the power plant boiler 1, the conversion device 3, the condenser 7 and the dry cooling device 5.
Through the technical scheme, the flue gas from the power plant is controlled, and the flue gas is in direct contact with the raw coal and the converted coal respectively at a certain temperature and flow ratio, so that the sectional heating of the raw coal is realized. The sectional operation can control the heating operation of each section more flexibly, which is beneficial to better producing clean coal. According to the invention, the raw coal and the converted coal are heated by high-temperature flue gas, so that the impurities such as volatile components, sulfides, mercury and the like in the coal can be removed, and the obtained clean coal can reduce the pollutant emission during the combustion of the coal. The quality of the clean coal can reach the quality standard of the civil bulk coal specified by DB13-2081-2014 standard.
In addition, the raw gas produced by the method can extract tar, the obtained gas not only returns to a power plant and is still used for power generation production of the power plant, so that normal power generation production of the power plant is ensured, but also the method provided by the invention can ensure that the produced gas is rich in reducing gas, and is beneficial to returning to the power plant to promote reduction of generation of nitrogen oxides in the flue gas of the power plant. The coal gas provided by the invention has the temperature of 300-500 ℃, and can play a role in stabilizing the furnace temperature and reducing the pollutant emission when being returned to the combustor of the power plant boiler.
The method can utilize the waste heat of the flue gas of the power plant and the existing flue gas treatment device of the power plant, can simplify the production process of clean coal, and reduces the investment of heat source and tail gas treatment of a clean coal production system.
Drawings
FIG. 1 is a schematic flow diagram of a method and a system for producing clean coal by coupling power generation of a power plant provided by the invention.
Description of the reference numerals
1. Power plant boiler 2, power plant boiler burner 3, conversion device
4. Impurity removing device 5, dry cooling device 6 and air inducing device
7. Condenser
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a method for producing clean coal by coupling power generation of a power plant, as shown in fig. 1, including:
(1) directly heating raw coal by using first flue gas at 800-1200 ℃ from a power plant boiler to perform coal conversion, wherein the final conversion temperature of the coal conversion is 500-640 ℃, and the conversion time is 10-60 min, so as to obtain first raw coke oven gas and converted coal;
(2) directly heating the converted coal by using 800-1200 ℃ second flue gas from a power plant boiler to remove impurities from the coal, wherein the final impurity removal temperature of the coal is 650-750 ℃, and the impurity removal time is 10-60 min, so as to obtain second raw gas and removed coal;
(3) the first crude gas and the second crude gas are converged and then tar is removed to obtain tar and gas; the coal gas returns to the boiler of the power plant for power generation;
(4) and (5) carrying out dry cooling on the impurity-removed coal to obtain clean coal.
Preferably, the final conversion temperature is 500-600 ℃, and the conversion time is 30-45 min.
Preferably, the final impurity removing temperature is 650-700 ℃, and the impurity removing time is 30-45 min.
In the invention, the clean coal production is carried out by utilizing the hot flue gas from the power plant, and meanwhile, the power generation production of the power plant is not influenced. The coal conversion in step (1) may be performed in a rotary kiln, a fluidized bed, a tower moving bed, a rake moving bed, or an entrained flow bed, as long as the first flue gas can be directly contacted with the raw coal, and the raw coal and the first flue gas may be operated in a counter-current or co-current manner, so as to remove light substances such as moisture and volatile components in the raw coal. Preferably, the temperature of the first flue gas and the second flue gas is 900-1000 ℃.
In the present invention, the first flue gas and the second flue gas are from hot flue gas produced by a power plant boiler, and can be used for power generation production. The use of the hot flue gas in the present invention can be a heat source for clean coal production. The hot flue gas can be led out according to a certain proportion according to the flow of the hot flue gas generated by the power plant and the quantity of clean coal required to be produced. Preferably, the total flow rate of the first flue gas and the second flue gas is 1-30 vol%, preferably 5-20 vol%, and more preferably 5-10 vol% of the total flow rate of the flue gases generated by the power plant boiler. According to the limitation, the method provided by the invention can meet the production requirement of clean coal, and the return air in the step (3) is returned to the boiler of the power plant to continuously provide the power generation production of the power plant without influencing the power generation production.
In the present invention, the first flue gas and the second flue gas are used in step (1) and step (2), respectively, for treating the raw coal and the converted coal, respectively. And (3) respectively using the first flue gas and the second flue gas to meet the conditions of coal conversion and coal impurity removal, and ensuring that the return air returned to the boiler of the power plant in the final step (3) can continuously provide power generation production of the power plant without influencing the power generation production. Preferably, the volume ratio between the first flue gas and the second flue gas is (1-4): 1, preferably (1-2): 1. under the limit, the method provided by the invention can realize the power generation production of a power plant and simultaneously produce clean coal.
In the invention, in the step (2), impurities such as mercury and the like contained in the converted coal can be removed in a direct heating mode under the coal impurity removal condition, so that the converted coal is cleaner. The coal-removing in step (2) may be performed in a rotary kiln, a fluidized bed, a tower-type moving bed, a rake-type moving bed, or an entrained flow bed, as long as the second flue gas is brought into direct contact with the converted coal, and the converted coal and the second flue gas may be operated in a counter-current or co-current manner.
In the present invention, it is preferable to compare 10000Nm3The total flow rate of the first and second flue gases, the feed of the raw coalThe amount is 3000-6000 kg, preferably 4000-5000 kg. The method can ensure that the raw coal is produced into clean coal, and the return air is returned to the power plant and can still continue to provide power generation production of the power plant.
In the present invention, preferably, the ratio of the conversion time to the impurity removal time is (1-2): 1. the production of clean coal can be ensured, and the return air returned to the power plant can be continuously used for the power generation production of the power plant.
According to the invention, when clean coal is produced by utilizing flue gas of a power plant boiler, tar can be separated from the obtained raw coke oven gas, so that a tar product is obtained. The tar removal can adopt the conventional technical measures in the field, and can be to condense the merged first crude gas and second crude gas so as to separate the tar and obtain the gas. And the gas obtained by removing tar can reduce the blockage of a nozzle in an air inducing device when returning to a burner of a power plant boiler. Preferably, the temperature of the return air is 300-500 ℃, and preferably 350-450 ℃; the flow rate of the return air is 100-130% by volume, preferably 100-120% by volume, and more preferably 105-120% by volume of the total flow rate of the first flue gas and the second flue gas.
In the invention, the impurity-removed coal refers to uncooled coal obtained by drying and impurity-removing raw coal and removing impurities in the method provided by the invention.
In the present invention, the raw coal may not be particularly limited. Preferably, the raw coal is at least one of lignite with the particle size of 1-100 mm, long flame coal and non-caking coal.
In the invention, the quality of the obtained clean coal meets the DB13-2081-2014 standard.
The invention provides a system for applying the method for producing clean coal by coupling power generation of the power plant, which comprises the following steps: the system comprises a power plant boiler 1, a raw coal impurity removal unit, a condenser 7, a dry cooling device 5 and an air inducing device 6;
the raw coal impurity removal unit is used for directly contacting flue gas from a power plant boiler 1 with raw coal to remove impurities in the raw coal, so as to obtain raw coke oven gas and removed coal;
the dry cooling device 5 is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal;
the condenser 7 is used for separating tar and coal gas from the raw coal impurity removal unit to obtain tar;
the air guiding device 6 is used for returning the gas from the condenser 7 to the burner 2 of the power plant boiler in the form of return air.
In the invention, preferably, the raw coal impurity removing unit comprises a conversion device 3 and an impurity removing device 4, wherein the conversion device 3 is communicated with the power plant boiler 1, the impurity removing device 4 and a condenser 7; the impurity removing device 4 is communicated with the power plant boiler 1, the conversion device 3, the condenser 7 and the dry cooling device 5.
In the present invention, the conversion apparatus 3 may be selected from a rotary kiln, a fluidized bed, a tower-type moving bed, a rake-type moving bed or an entrained flow bed.
In the present invention, the impurity removal apparatus 4 may be selected from a rotary kiln, a fluidized bed, a tower-type moving bed, a rake-type moving bed, or an entrained flow bed.
In the present invention, the dry cooling device 5 may use an existing dry quenching method.
In the invention, the condenser 7 can be equipment which is conventionally used for tar removal in the field, and the requirement of separating tar and coal gas in the raw coke oven gas is met.
The present invention will be described in detail below by way of examples.
The clean coals obtained in the examples and comparative examples were measured for sulfur content, ash sulfur content and volatile matter content according to the DB13-2081-2014 standard.
The clean coal specified in the DB13-2081-2014 standard has an overall sulfur content of < 0.4 wt.%, an ash content of < 16 wt.% and a volatile content of < 10 wt.%.
Example 1
(1) 5000Nm3The first flue gas (900 ℃) is directly contacted with 4500kg of raw coal (lignite, the grain diameter is 20mm) in a countercurrent mode in a rotary kiln, coal conversion is carried out for 45min, and the final conversion temperature is 600 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 5000Nm3The second flue gas (900 ℃) of the/h and the converted coal are in a countercurrent mode in the rotary kilnDirectly contacting, removing impurities from the coal for 35min, and finally removing impurities at 650 ℃ to obtain second raw coke oven gas and removed impurities;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3And the temperature is 450 ℃ and returns to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 2
(1) 6500Nm3The first flue gas (1000 ℃) is directly contacted with 4000kg of raw coal (non-sticky coal, the grain diameter is 1mm) in a fluidized bed in a countercurrent mode, the coal is converted for 30min, and the final conversion temperature is 500 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 3500Nm3The second flue gas (1000 ℃) and the converted coal directly contact in a countercurrent mode in the rotary kiln, coal impurity removal is carried out for 30min, and the final impurity removal temperature is 700 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (11000 Nm)3And h, the temperature is 350 ℃) and returns to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of the first flue gas and the second flue gas corresponds to 10 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 3
(1) 6000Nm3The first flue gas (950 ℃ C.) and 5000kg of raw coal (long flame coal, particle size 3mm) are in countercurrent flow in the moving bedDirectly contacting, and performing coal conversion for 40min, wherein the final conversion temperature is 550 ℃, so as to obtain first raw coke oven gas and converted coal;
(2) 4000Nm3The second flue gas (950 ℃) is directly contacted with the converted coal in a countercurrent mode in the rotary kiln for coal impurity removal for 30min, and the final impurity removal temperature is 650 ℃, so that second raw coke oven gas and impurity removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (10500 Nm)3And the temperature is 400 ℃ and returns to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of the first flue gas and the second flue gas corresponds to 10 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 4
(1) 5000Nm3The first flue gas (800 ℃) of per hour directly contacts 4500kg of raw coal (lignite powder coal, the grain diameter is 20mm) in a rotary kiln in a countercurrent mode, coal conversion is carried out for 45min, and the final conversion temperature is below 600 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 5000Nm3The second flue gas (800 ℃) and the converted coal directly contact in a countercurrent mode in a rotary kiln, and coal impurity removal is carried out for 35min, the final impurity removal temperature is 600 ℃, so that second raw coke oven gas and impurity removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3And h, the temperature is 450 ℃), and the air is returned to a burner of a boiler of the power plant through an air inducing device for generating electricity.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 5
(1) 5000Nm3The method comprises the following steps of (1) enabling power plant flue gas (1200 ℃) to directly contact 4500kg of raw coal (lignite, the particle size of which is 20mm) in a countercurrent mode in a rotary kiln, carrying out coal conversion for 30min, and obtaining first raw coke oven gas and converted coal when the final conversion temperature is 600 ℃;
(2) 5000Nm3The smoke gas (1200 ℃) of the power plant and the converted coal directly contact in a countercurrent mode in a rotary kiln, the coal is subjected to impurity removal for 30min, and the final impurity removal temperature is 650 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3H, the temperature is 500 ℃), and the air is returned to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 6
(1) 8000Nm3The first flue gas (900 ℃) is directly contacted with 4500kg of raw coal (lignite with the particle size of 20mm) in a countercurrent mode in a rotary kiln, coal conversion is carried out for 45min, and the final conversion temperature is below 600 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 2000Nm3The second flue gas (900 ℃) and the converted coal directly contact in a countercurrent mode in the rotary kiln, and coal is subjected to impurity removal for 40min, wherein the final impurity removal temperature is 650 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3H, temperature 450 ℃) and returns electricity through an induced draft deviceThe burners of the plant boiler are used for generating electricity.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 7
(1) 5000Nm3The first flue gas (900 ℃) of per hour directly contacts 6000kg of raw coal (lignite powder coal with the particle size of 20mm) in a rotary kiln in a countercurrent mode, coal conversion is carried out for 60min, and the final conversion temperature is below 600 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 5000Nm3The second flue gas (900 ℃) and the converted coal directly contact in a countercurrent mode in the rotary kiln, the coal is subjected to impurity removal for 30min, and the final impurity removal temperature is 650 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3And h, the temperature is 450 ℃), and the air is returned to a burner of a boiler of the power plant through an air inducing device for generating electricity.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 8
(1) 5000Nm3The method comprises the following steps of (1) enabling power plant flue gas (900 ℃) to directly contact 4500kg of raw coal (lignite, the particle size of which is 20mm) in a countercurrent mode in a rotary kiln, carrying out coal conversion for 45min, and obtaining first raw coke oven gas and converted coal when the final conversion temperature is 640 ℃;
(2) 5000Nm3The power plant flue gas (900 ℃) and the converted coal directly contact in a countercurrent mode in a rotary kiln, and coal impurity removal is carried out for 35min, the final impurity removal temperature is 750 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3And h, the temperature is 450 ℃), and the air is returned to a burner of a boiler of the power plant through an air inducing device for generating electricity.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Example 9
(1) 5000Nm3The first flue gas (900 ℃) is directly contacted with 4500kg of raw coal (lignite with the particle size of 20mm) in a countercurrent mode in a rotary kiln, coal conversion is carried out for 50min, and the final conversion temperature is below 600 ℃, so that first raw coke oven gas and converted coal are obtained;
(2) 5000Nm3The second flue gas (900 ℃) and the converted coal directly contact in a countercurrent mode in the rotary kiln, and the coal is subjected to impurity removal for 25min, wherein the final impurity removal temperature is 650 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) the first raw gas and the second raw gas are converged and then subjected to tar removal through condensation to obtain a tar product; the gas obtained at the same time is used as return air (12000 Nm)3And h, the temperature is 450 ℃), and the air is returned to a burner of a boiler of the power plant through an air inducing device for generating electricity.
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Comparative example 1
(1) 2000Nm3The method comprises the following steps of (1) enabling power plant flue gas (300 ℃) to directly contact 4500kg of raw coal (lignite, the particle size of which is 20mm) in a countercurrent mode in a rotary kiln, carrying out coal conversion for 45min, and obtaining first raw coke oven gas and converted coal when the final conversion temperature is 200 ℃;
(2) 8000Nm3The power plant flue gas (900 ℃) and the converted coal directly contact in a countercurrent mode in a rotary kiln, coal impurity removal is carried out for 40min, and the final impurity removal temperature is 820 ℃, so that second raw coke oven gas and impurity-removed coal are obtained;
(3) dry quenching the impurity-removed coal by using air to obtain clean coal;
(4) the first and second raw gas are combined into return air (9000 Nm)3And h, the temperature is 700 ℃), and the air is returned to a burner of a boiler of the power plant through an induced air unit for generating power.
The total flow of flue gases from the power plant corresponds to 5% by volume of the total flow of flue gases from the boiler of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were measured and the results are shown in table 1.
Comparative example 2
(1) 2000Nm3Drying the power plant flue gas (lower than 300 ℃) and 4500kg of raw coal (lignite, the particle size is 20mm) at the drying temperature of 200 ℃ to obtain converted coal;
(2) 4000Nm3The power plant smoke (900 ℃) and the converted coal are pyrolyzed for 45min at the pyrolysis temperature of 600 ℃ to obtain semicoke, tar steam and coal gas;
(3) 4000Nm3Heating power plant flue gas (900 ℃) and semicoke at the impurity removal temperature of 800 ℃ to obtain coke and high-temperature mixed gas;
(4) quenching coke to obtain product coke;
(5) mixing the crude tar, coal gas and high-temperature mixed gas into return air (10000 Nm)3And/h, the temperature is 750 ℃), and the air is returned to a burner of a boiler of the power plant through an induced air unit to be used for generating power.
The total flow of flue gases from the power plant corresponds to 5% by volume of the total flow of flue gases from the boiler of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were determined and the results are shown in table 2.
Comparative example 3
(1) 10000Nm3The flue gas (900 ℃) is in direct contact with 4500kg of raw coal (lignite, the grain diameter is 20mm) in a countercurrent mode in a rotary kiln, the coal is heated for 45min, the final heating temperature is 600 ℃, and raw coke oven gas is obtainedAnd a coal product;
(2) carrying out dry cooling on the coal product by using air to obtain clean coal;
(3) raw coke oven gas (9000 Nm)3And the temperature is 450 ℃ as return air, and the return air is returned to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of flue gases corresponds to 5% by volume of the total flow of boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were determined and the results are shown in table 2.
Comparative example 4
(1) 10000Nm3The flue gas (900 ℃) of per hour directly contacts 4500kg of raw coal (lignite, the grain diameter is 20mm) in a countercurrent mode in a rotary kiln, coal is heated for 40min, and the final heating temperature is 750 ℃, so that raw coke oven gas and coal products are obtained;
(2) carrying out dry cooling on the coal product by using air to obtain clean coal;
(4) raw coke oven gas (9000 Nm)3And the temperature is 450 ℃ as return air, and the return air is returned to a burner of a boiler of the power plant through an air inducing device for generating power.
The total flow of flue gases corresponds to 5% by volume of the total flow of boiler flue gases of the power plant.
The quality of clean coal, flue gas generated energy and return air generated energy were determined and the results are shown in table 2.
TABLE 1
Note:
1 total flow of the first flue gas and the second flue gas is a volume percent, vol% of the total flow of flue gases produced by the power plant boiler;
2 volume ratio between the first flue gas and the second flue gas;
3 relative to 10000Nm3The total flow rate of the first flue gas and the second flue gas, the feed rate of raw coal;
4 ratio of conversion time to dehalogenation time;
5, the flow rate of the return air is volume percent of the total flow rate of the first flue gas and the second flue gas;
10000Nm from 6 power plant3The flue gas is used for generating electricity which can be generated and is calculated by standard coal;
and 7, the return air is used for generating the electric quantity which can be generated by power generation, and is calculated by standard coal.
Table 1 (continuation 1)
Table 1 (continuation 2)
TABLE 2
Note:
1 total flow of the first flue gas and the second flue gas is a volume percent, vol% of the total flow of flue gases produced by the power plant boiler;
2 volume ratio between the first flue gas and the second flue gas;
3 relative to 10000Nm3The total flow rate of the first flue gas and the second flue gas, the feed rate of raw coal;
4 ratio of conversion time to dehalogenation time;
5, the flow rate of the return air is volume percent of the total flow rate of the first flue gas and the second flue gas;
10000Nm from 6 power plant3The flue gas is used for generating electricity which can be generated and is calculated by standard coal;
and 7, the return air is used for generating the electric quantity which can be generated by power generation, and is calculated by standard coal.
It can be seen from the results of the examples and comparative examples that the use of the examples of the process of the present invention allows the simultaneous realization of power generation in a power plant and clean coal production.
The quality of the clean coal obtained by the method meets the quality standard of civil scattered coal in DB13-2081-2014 standard, and the mercury content is low. The clean coal obtained in the comparative example did not meet the above standards or no clean coal was obtained, and the mercury content was high.
According to the method, clean coal is produced by using hot flue gas of a boiler of a power plant, and meanwhile, after tar can be extracted from raw gas, the obtained gas is returned to the power plant as return air for power generation, and the generated energy is increased.
The flue gas temperatures defined in examples 4 and 5 are not in the most preferable ranges, the volume ratio of the first and second flue gases in example 6 is not in the most preferable ranges, the raw coal feed amount in example 7 is not in the most preferable ranges, the conversion temperature and the dehairing temperature in example 8 are not in the most preferable ranges, and the conversion time and the dehairing time in example 9 are not in the most preferable ranges, although clean coal of acceptable quality can be produced, the power generation of the return air is not as good as in examples 1 to 3.
The comparative examples 1 to 4 do not adopt the method of the invention, so that the produced clean coal is unqualified, and the generated energy of return air is reduced, thereby influencing the power generation production of a power plant.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (11)
1. A method for producing clean coal by power plant power generation coupling comprises the following steps:
(1) directly heating raw coal by using first flue gas at 900-1000 ℃ from a boiler of an electric plant to perform coal conversion, wherein the final conversion temperature of the coal conversion is 500-640 ℃, and the conversion time is 10-60 min, so as to obtain first raw coke oven gas and converted coal;
(2) directly heating the converted coal by using 900-1000 ℃ second flue gas from a power plant boiler to remove impurities from the coal, wherein the final impurity removal temperature of the coal is 650-750 ℃, and the impurity removal time is 10-60 min, so as to obtain second raw gas and removed coal;
(3) the first crude gas and the second crude gas are converged and then tar is removed to obtain tar and gas; the coal gas returns to a burner of a boiler of the power plant in a return air mode for generating power;
(4) dry cooling the impurity-removed coal to obtain clean coal;
wherein the total flow rate of the first flue gas and the second flue gas is 1-30 vol% of the total flow rate of the flue gas generated by the boiler of the power plant, and the volume ratio of the first flue gas to the second flue gas is (1-2): 1;
wherein, relative to 10000Nm3The total flow rate of the first flue gas and the second flue gas is 4000-5000 kg of the raw coal feeding amount.
2. The method of claim 1, wherein the total flow of the first and second flue gases is 5-20 vol% of the total flow of flue gases produced by the power plant boiler.
3. The method of claim 1, wherein the total flow of the first and second flue gases is 5-10 vol% of the total flow of flue gases produced by the power plant boiler.
4. The method of claim 1, wherein the ratio of the conversion time to the dehalogenation time is (1-2): 1.
5. The method of claim 1, wherein the return air has a temperature of 300 to 500 ℃; the flow rate of the return air is 100-130% by volume of the total flow rate of the first flue gas and the second flue gas.
6. A method as claimed in claim 5, wherein the return air is at a temperature of 350 to 450 ℃.
7. The method of claim 5, wherein the flow rate of the return air is 100 to 120 vol% of the total flow rate of the first and second flue gases.
8. The method of claim 5, wherein the flow rate of the return air is 105 to 120 vol% of the total flow rate of the first and second flue gases.
9. The method according to claim 1, wherein the raw coal is at least one of lignite, long flame coal and non-caking coal having a particle size of 1 to 100 mm.
10. A system for applying the method of power plant power generation coupling to produce clean coal as claimed in any one of claims 1 to 9, comprising: the system comprises a power plant boiler (1), a raw coal impurity removal unit, a condenser (7), a dry cooling device (5) and an air inducing device (6);
the raw coal impurity removal unit is used for directly contacting the flue gas from the electric plant boiler (1) with the raw coal to remove impurities in the raw coal so as to obtain raw coke oven gas and impurity removed coal;
the dry cooling device (5) is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal;
the condenser (7) is used for separating tar and coal gas from the raw coal impurity removal unit to obtain tar;
the air inducing device (6) is used for returning the coal gas from the condenser (7) to the burner (2) of the power plant boiler in the form of return air.
11. The system according to claim 10, wherein the raw coal deduplicating unit comprises a conversion device (3) and a deduplicating device (4), wherein,
the conversion device (3) is communicated with the power plant boiler (1), the impurity removal device (4) and the condenser (7); the impurity removing device (4) is communicated with the power plant boiler (1), the conversion device (3), the condenser (7) and the dry cooling device (5).
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: CHINA ENERGY INVESTMENT Corp.,Ltd. Patentee after: Beijing low carbon clean energy Research Institute Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: SHENHUA GROUP Corp.,Ltd. Patentee before: NATIONAL INSTITUTE OF CLEAN-AND-LOW-CARBON ENERGY |