CN109929572B - 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 coal-fired clean production coupling, and discloses a method and a system for producing clean coal in a power plant coupling mode. The method comprises the following steps: (1) indirectly heating raw coal by using first flue gas from a boiler of a power plant to perform coal conversion, wherein the final conversion temperature is 500-640 ℃, and the conversion time is 10-60 min, so as to obtain first flue gas, first pyrolysis gas and converted coal; (2) indirectly heating the converted coal by using second flue gas from a power plant boiler to remove impurities from the coal, wherein the final impurity removal temperature is 650-750 ℃, and the impurity removal time is 10-60 min, so as to obtain second flue gas, second pyrolysis gas and removed coal; (3) the first flue gas and the second flue gas are combined into return flue gas which is sent to a boiler of a power plant for power generation; the first pyrolysis gas and the second pyrolysis gas are converged and then sequentially combusted and subjected to heat exchange; (4) and (5) carrying out dry cooling on the impurity-removed coal to obtain clean coal. Normal power generation production of a power plant is realized, and meanwhile, low-rank raw coal is produced into clean coal.
Description
Technical Field
The invention relates to the field of power plant power generation and coal-fired clean 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. 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 lower, and the sustainable development of the power generation industry is restricted.
In addition, smoke emission generated in the civil scattered burning coal burning process is an important reason for causing haze. In order to solve the increasingly severe problem of atmospheric pollution, the state has developed policy documents and developed actions 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 activity of the adsorption performance is lostThe coke is sent into a boiler for combustion, and the energy of the active coke is fully utilized. The method is used for solving the problem of pollutant emission of the flue gas of the power plant, the flue gas is used for preparing the active coke from the coal, and the active coke and the generated pyrolysis gas are used for reducing the pollutant emission of the flue 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.
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 problems of realizing the combination of power generation of a power plant and clean coal production and balancing the stable production of the power plant and the clean coal, and provides a method and a system for producing clean coal by coupling power generation of the power plant.
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) indirectly 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 flue gas, first pyrolysis gas and converted coal;
(2) indirectly 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 flue gas, second pyrolysis gas and removed coal;
(3) the first flue gas and the second flue gas are combined into return flue gas which is sent to a boiler of a power plant for power generation; the first pyrolysis gas and the second pyrolysis gas are converged and then sequentially combusted and subjected to heat exchange to obtain steam and tail gas; returning the steam and tail gas to a power plant boiler for power generation;
(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%, more preferably 5-20 vol%, and still 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, more preferably (1-2): 1.
preferably, relative to 10000Nm3The total flow rate of the first flue gas and the second flue gas is 3000-6000 kg of the raw coal, and more preferably 4000-5000 kg of the raw coal.
Preferably, the ratio of the conversion time to the impurity removal time is (1-2): 1.
preferably, the temperature of the returned flue gas is 750-900 ℃; the temperature of the steam is 750-900 ℃; the temperature of the tail gas is 300-500 ℃, and preferably 350-450 ℃; the total flow rate of the return flue gas and the tail gas is 100-130 vol%, preferably 100-120 vol%, and more preferably 105-120 vol% 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 second aspect of the invention provides a system for applying the method for producing clean coal by coupling power generation of the power plant, which comprises a power plant boiler 1, a raw coal impurity removal unit, a co-combustion furnace 6, a waste heat boiler 7, a dry cooling device 5 and an induced draft device 2; wherein the content of the first and second substances,
the raw coal impurity removal unit is used for indirectly heating the raw coal by using flue gas from the power plant boiler 1, removing impurities in the raw coal to obtain flue gas, pyrolysis gas and removed impurity coal, and returning the flue gas to the power plant boiler 1 for power generation;
the mixed combustion furnace 6 is used for combusting pyrolysis gas from the raw coal impurity removal unit, hot air obtained by combustion is introduced into a waste heat boiler 7, and the waste heat boiler 7 is used for carrying out heat exchange on the hot air and boiler feed water to obtain steam and tail gas;
the waste heat boiler 7 is communicated with the power plant boiler 1 and the air inducing device 2, the steam returns to the power plant boiler 1, and the tail gas returns to the power plant boiler 1 through the air inducing device 2;
the dry cooling device 5 is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal.
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 removing device 4 and the mixed combustion furnace 6; the impurity removing device 4 is communicated with the power plant boiler 1, the conversion device 3, the induced draft device 2 and the dry cooling device 5.
Through the technical scheme, flue gas from a power plant is controlled, and the flue gas is indirectly heated with raw coal and 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.
According to the invention, the heat in the pyrolysis gas can be recovered by the mixed combustion furnace and the waste heat boiler and then returned to the power plant for power generation. Meanwhile, the tail gas purification can utilize the existing devices of the power plant. Therefore, the invention utilizes the flue gas waste heat of the power plant and the existing flue gas treatment device of the power plant, can reduce the coal consumption of power plant power generation, and can reduce 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.
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) indirectly 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 flue gas, first pyrolysis gas and converted coal;
(2) indirectly 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 flue gas, second pyrolysis gas and removed coal;
(3) the first flue gas and the second flue gas are combined into return flue gas which is sent to a boiler of a power plant for power generation; the first pyrolysis gas and the second pyrolysis gas are converged and then sequentially combusted and subjected to heat exchange to obtain steam and tail gas; returning the steam and tail gas to a power plant boiler 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 the step (1) may be performed in a rotary kiln, a tower-type moving bed or a rake-type moving bed as long as the indirect heating of the raw coal by the first flue gas can be realized, 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%, more preferably 5-20 vol%, and still 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 pyrolysis gas in the step (3) is returned to the power plant through the heat converted by the mixed combustion furnace and the waste heat boiler, so that the power generation production of the power plant can be continuously provided, and the power generation production is not influenced.
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 heat of the pyrolysis gas returned to the power plant after the step (3) and the returned flue gas can be continuously supplied to the 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 an indirect heating mode under the coal impurity removal condition, so that the converted coal is cleaner. The coal removal in step (2) may be performed in a rotary kiln, a tower-type moving bed, or a rake-type moving bed, as long as indirect contact between the second flue gas and the converted coal is achieved.
In the present invention, it is preferable to compare 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. The method can ensure that the raw coal is produced into clean coal, and the heat converted by the pyrolysis gas through the mixed combustion furnace and the waste heat boiler and the returned flue gas can still continue to provide power generation production of a 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 is ensured, and meanwhile, the pyrolysis gas can be continuously used for power generation production of a power plant through the heat converted by the mixed combustion furnace and the waste heat boiler and the returned flue gas.
In the invention, the returned flue gas, the steam and the tail gas are all returned to the power plant for the battery power generation production. Preferably, the temperature of the returned flue gas is 750-900 ℃; the temperature of the steam is 750-900 ℃; the temperature of the tail gas is 300-500 ℃, and preferably 350-450 ℃; the total flow rate of the return flue gas and the tail gas is 100-130 vol%, preferably 100-120 vol%, and more preferably 105-120 vol% of the total flow rate of the first flue gas and the second flue gas. The tail gas returns to the power plant through an air inducing device in the form of return air.
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 second aspect of the invention provides a system for applying the method for producing clean coal by coupling power generation of the power plant, which comprises a power plant boiler 1, a raw coal impurity removal unit, a co-combustion furnace 6, a waste heat boiler 7, a dry cooling device 5 and an induced draft device 2; wherein the content of the first and second substances,
the raw coal impurity removal unit is used for indirectly heating the raw coal by using flue gas from the power plant boiler 1, removing impurities in the raw coal to obtain flue gas, pyrolysis gas and removed impurity coal, and returning the flue gas to the power plant boiler 1 for power generation;
the mixed combustion furnace 6 is used for combusting pyrolysis gas from the raw coal impurity removal unit, hot air obtained by combustion is introduced into a waste heat boiler 7, and the waste heat boiler 7 is used for carrying out heat exchange on the hot air and boiler feed water to obtain steam and tail gas;
the waste heat boiler 7 is communicated with the power plant boiler 1 and the air inducing device 2, the steam returns to the power plant boiler 1, and the tail gas returns to the power plant boiler 1 through the air inducing device 2;
the dry cooling device 5 is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal.
In the present invention, preferably, the raw coal impurity removal unit includes 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 removing device 4 and the mixed combustion furnace 6; the impurity removing device 4 is communicated with the power plant boiler 1, the conversion device 3, the induced draft device 2 and the dry cooling device 5.
In the present invention, the conversion apparatus 3 may be selected from a rotary kiln, a tower-type moving bed or a rake-type moving bed.
In the present invention, the impurity removing device 4 may be selected from a rotary kiln, a tower-type moving bed or a rake-type moving bed.
In the present invention, the dry cooling device 5 may use an existing dry quenching method.
In the present invention, the co-firing furnace 6 is not particularly limited, and any equipment conventionally used in the art may be used to achieve the combustion of the raw coke oven gas.
In the present invention, the waste heat boiler 7 may be any equipment conventionally used in the art to realize the heat exchange of the hot wind.
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) 5000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by the first flue gas (900 ℃) of per hour, coal conversion is carried out for 45min, and the final conversion temperature is 600 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 5000Nm3The second flue gas (900 ℃) of the/h indirectly heats the converted coal in the rotary kiln, the coal is subjected to impurity removal for 35min, and the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 2
(1) With 6500Nm3Indirectly heating 4000kg of raw coal (non-sticky coal and with the particle size of 30mm) in a tower type moving bed by using first flue gas (1000 ℃) for 30min for coal conversion, and finally obtaining first flue gas, first pyrolysis gas and converted coal, wherein the final conversion temperature is 500 ℃;
(2) with 3500Nm3Indirectly heating the converted coal in the rotary kiln by second flue gas (1000 ℃) for 30min, and finally removing impurities at 700 ℃ to obtain second flue gas, second pyrolysis gas and removed coal;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) will be first and secondThe second pyrolysis gas is merged and then is introduced into a mixed combustion furnace for combustion, the obtained hot air is introduced into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, the steam (the temperature is 900 ℃) returns to a power plant boiler for power generation, and the tail gas is used as return air (the temperature is 350 ℃) and returns to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (900 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 11000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 10 volume% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 3
(1) Using 6000Nm3The first flue gas (950 ℃) indirectly heats 5000kg of raw coal (long flame coal with the grain diameter of 3mm) in the tower type moving bed for coal conversion for 40min, and the final conversion temperature is 550 ℃, so that first flue gas, first pyrolysis gas and converted coal are obtained;
(2) with 4000Nm3Indirectly heating the converted coal in the rotary kiln by using the first flue gas (950 ℃) for 30min, and finally removing impurities at 650 ℃ to obtain second flue gas, second pyrolysis gas and removed coal;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 750 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 400 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (750 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 105000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 8 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 4
(1) 5000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by the first flue gas (800 ℃) of per hour, coal conversion is carried out for 45min, and the final conversion temperature is 600 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 5000Nm3The second flue gas (800 ℃) indirectly heats the converted coal in the rotary kiln, and the coal is subjected to impurity removal for 40min, wherein the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 5
(1) 5000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by first flue gas (1200 ℃) of per hour, coal conversion is carried out for 45min, and the final conversion temperature is 600 ℃, so that first flue gas, first pyrolysis gas and converted coal are obtained;
(2) 5000Nm3The second flue gas (120 ℃) indirectly heats the converted coal in the rotary kiln, and the coal is subjected to impurity removal for 40min, wherein the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 6
(1) 8000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by the first flue gas (900 ℃) of per hour, coal conversion is carried out for 45min, and the final conversion temperature is below 600 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 2000Nm3The second flue gas (900 ℃) of the/h indirectly heats the converted coal in the rotary kiln, the coal is subjected to impurity removal for 40min, and the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 7
(1) 5000Nm36000kg of raw coal (lignite, the particle size of which is 20mm) in the rotary kiln is indirectly heated by the first flue gas (900 ℃) for coal conversion for 60min, and the final conversion temperature is below 600 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 5000Nm3The second flue gas (900 ℃) of the/h indirectly heats the converted coal in the rotary kiln, the coal is subjected to impurity removal for 30min, and the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 8
(1) 5000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by the first flue gas (900 ℃) of per hour, coal conversion is carried out for 45min, and the final conversion temperature is below 640 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 5000Nm3The second flue gas (900 ℃) of the/h indirectly heats the converted coal in the rotary kiln, the coal is subjected to impurity removal for 35min, and the final impurity removal temperature is 750 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
Example 9
(1) 5000Nm34500kg of raw coal (lignite with the particle size of 20mm) in the rotary kiln is indirectly heated by the first flue gas (900 ℃) of per hour, coal conversion is carried out for 50min, and the final conversion temperature is below 600 ℃ to obtain first flue gas, first pyrolysis gas and converted coal;
(2) 5000Nm3The second flue gas (900 ℃) of the/h indirectly heats the converted coal in the rotary kiln, the coal is subjected to impurity removal for 25min, and the final impurity removal temperature is 650 ℃, so that second flue gas, second pyrolysis gas and impurity-removed coal are obtained;
(3) dry cooling the impurity-removed coal to obtain clean coal;
(4) merging the first pyrolysis gas and the second pyrolysis gas, introducing the merged gas into a mixed combustion furnace for combustion, introducing the obtained hot air into a waste heat boiler to exchange heat with boiler feed water to generate steam and tail gas, returning the steam (with the temperature of 800 ℃) to a power plant boiler for power generation, and returning the tail gas serving as return air (with the temperature of 450 ℃) to the power plant boiler through an air inducing device for power generation; the first flue gas and the second flue gas are combined into return flue gas (800 ℃) which is sent to a boiler of a power plant for power generation; the total flow of return air and return flue gas is 12000Nm3/h；
The total flow of the first flue gas and the second flue gas corresponds to 5 vol% of the total flow of the power plant boiler flue gases.
The quality of the clean coal, the power generation capacity of the flue gas, and the power generation capacity of (steam + tail gas + return flue gas) were measured, and the results are shown in table 1.
COMPARATIVE EXAMPLE 1 (COMPARATIVE US20170137731A1)
(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 the flue gas of the power plant corresponds to 5 volume percent of the total flow of the flue gas of 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 (COMPARATIVE CN92104624.3)
(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 gas from the power plant corresponds to 5% by volume of the total flow of flue gas 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 ℃) of per hour directly contacts 4500kg of raw coal (lignite, the grain diameter is 20mm) in a rotary kiln in a countercurrent mode, the coal is heated for 45min, and the final heating temperature is 600 ℃, 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;
(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 flue gas flow corresponds to 5% by volume 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 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 rotary kiln in a countercurrent mode, the coal is heated for 45min, 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 flue gas flow corresponds to 5% by volume 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 determined and the results are shown in table 2.
TABLE 1
Note:
1 the total flow of the first flue gas and the second flue gas is the 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 total flow of tail gas and return flue gas is volume percent of the total flow of the first flue gas and the second flue gas;
6 total flow of tail gas and return flue gas;
10000Nm from 7 power plant3The flue gas is used for generating electricity which can be generated and is calculated by standard coal;
and 8, using the steam, the tail gas and the return flue gas for generating electricity, and calculating according to 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 volume percent, vol% of the return air flow to the total flow 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 in an embodiment, meanwhile, heat recovered by the pyrolysis gas through the mixed combustion furnace and the waste heat boiler is converted into steam and tail gas, and the steam and the return flue gas are returned to the power plant for power generation, so that the power generation amount 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 removal temperature in example 8 are not in the most preferable ranges, and the conversion time and the removal time in example 9 are not in the most preferable ranges, although clean coal of satisfactory quality can be produced, the return power generation 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) indirectly heating raw coal by using first flue gas at the temperature of 900-;
(2) indirectly heating the converted coal by using a second flue gas at the temperature of 900-1000 ℃ 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 a second flue gas, a second pyrolysis gas and the removed coal;
(3) the first flue gas and the second flue gas are combined into return flue gas which is sent to a boiler of a power plant for power generation; the first pyrolysis gas and the second pyrolysis gas are converged and then sequentially combusted and subjected to heat exchange to obtain steam and tail gas; returning the steam and tail gas to a power plant boiler for power generation;
(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 2, 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 temperature of the return flue gas is 750-900 ℃; the temperature of the steam is 750-900 ℃; the temperature of the tail gas is 300-500 ℃; the total flow rate of the return flue gas and the tail gas is 100-130 vol% of the total flow rate of the first flue gas and the second flue gas.
6. A method according to claim 5, wherein the temperature of the off-gas is 350 to 450 ℃.
7. The method of claim 5, wherein the total flow of the return flue gas and tail gas is 100-120 vol% of the total flow of the first and second flue gases.
8. The method of claim 7, wherein the total flow of the return flue gas and tail gas is 105-120 vol% of the total flow 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 the power plant power generation coupling clean coal production method application of any one of claims 1-9, comprising a power plant boiler (1), a raw coal impurity removal unit, a co-firing furnace (6), a waste heat boiler (7), a dry cooling device (5) and an induced draft device (2); wherein the content of the first and second substances,
the raw coal impurity removal unit is used for indirectly heating the raw coal by using flue gas from the power plant boiler (1), removing impurities in the raw coal to obtain flue gas, pyrolysis gas and removed impurity coal, and returning the flue gas to the power plant boiler (1) for power generation;
the mixed combustion furnace (6) is used for combusting pyrolysis gas from the raw coal impurity removal unit, hot air obtained by combustion is introduced into a waste heat boiler (7), and the waste heat boiler (7) is used for carrying out heat exchange on the hot air and boiler feed water to obtain steam and tail gas;
the waste heat boiler (7) is communicated with the power plant boiler (1) and the air inducing device (2), the steam returns to the power plant boiler (1), and the tail gas returns to the power plant boiler (1) through the air inducing device (2);
and the dry cooling device (5) is used for cooling the impurity-removed coal by a dry cooling method to obtain clean coal.
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 removing device (4) and the mixed combustion furnace (6); the impurity removing device (4) is communicated with the power plant boiler (1), the conversion device (3), the air inducing device (2) 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: Beijing low carbon clean energy research institute |