CN112940760A - System and process for preparing active coke powder in thermal power plant and peak regulation control method - Google Patents
System and process for preparing active coke powder in thermal power plant and peak regulation control method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B31/00—Charging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/02—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B51/00—Destructive distillation of solid carbonaceous materials by combined direct and indirect heating
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/005—After-treatment of coke, e.g. calcination desulfurization
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/18—Modifying the properties of the distillation gases in the oven
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
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Abstract
The invention relates to a system for preparing active coke powder from coal powder in a thermal power plant, which comprises a power station boiler and a coal powder coking and activating integrated furnace, wherein the outlet of the power station boiler is connected with the inlet of the coal powder coking and activating integrated furnace; the system and the process for preparing the active coke powder by using the coal powder in the thermal power plant and the peak regulation control method realize the coking and activation process of coal with low energy consumption and high efficiency.
Description
Technical Field
The invention relates to the field of production of rails, in particular to a system and a process for preparing active coke powder from coal powder of a thermal power plant and a peak regulation control method.
Background
With research, high oil and gas resources exist in coal. Therefore, the coal pyrolysis technology can improve the quality and utilization efficiency of coal, and pyrolysis products of coal tar and pyrolysis gas can be used as supplement of petroleum and natural gas. In the conventional coal-fired thermal power plant, the quality of coal entering a power station boiler is reduced year by year due to the rise of coal price in recent years, so that the combustion efficiency and the boiler efficiency of the coal-fired boiler are reduced. The raw coal is used for clean treatment to produce high-added-value semi coke, active carbon, tar and coal gas, and even higher-added-value chemical products become a new direction for the development of the coal chemical industry.
In recent years, the emission standard of atmospheric pollutants is on SO2Emission limits are increasingly stringent. However, the existing calcium-based wet desulphurization technology is mature and reliable, the desulphurization efficiency is high, the raw materials are easy to obtain, but the defects of large water consumption, secondary pollution, high investment and the like exist. With the popularization of wet and semi-dry desulfurization technologies, a large amount of limestone needs to be exploited as a desulfurizing agent, so that a large amount of local massif rocks are excessively exploited, and a new limestone resource needs to be searched in a more remote place, thereby not only increasing the desulfurization cost, but also seriously damaging the local ecological environment.
The active coke flue gas desulfurization technology is an advanced dry flue gas desulfurization technology, does not use water in the desulfurization process, has no secondary pollution problems such as waste water, waste residue and the like, and can realize resource recycling of sulfur. Therefore, the active coke dry desulphurization technology is a green desulphurization technology which can realize resource utilization of sulfur. Currently, the adsorption desulfurization-thermal regeneration method of the activated carbon (coke) moving bed is developed into a mature industrial application technology. The active coke used in industry is a shaped column active coke with a diameter of 5-9mm, but has the problems of large internal diffusion resistance, low internal surface utilization rate, complex manufacturing process, high price, low mechanical strength, large loss and the like, and the application of the active coke desulfurization technology in China is severely limited.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention discloses a system and a process for preparing active coke powder from coal powder in a thermal power plant and a peak regulation control method.
The invention is realized by the following technical scheme:
the utility model provides a system for active coke powder is prepared to coal powder of thermal power plant, includes power boiler and the integrative stove of buggy coking activation, power boiler's export with the entry of the integrative stove of buggy coking activation links to each other, be equipped with electric heater in the integrative stove of buggy coking activation, the heating heat source of the integrative stove of buggy coking activation is power boiler's flue gas and/or electric heater, the coal powder is the steam of power boiler in the activator source of the integrative stove of coking activation. The system for preparing the active coke powder by using the coal powder in the thermal power plant cokes the coal powder by using at least one of the flue gas of a power station boiler and an electric heater, so that the coal pyrolysis and coking process with low energy consumption is realized; the water vapor of the power station boiler is used as the low-cost activating agent for coking the coal powder, so that the activation process of the coked coal powder is realized efficiently.
Further, the system that active coke powder was prepared to thermal power plant's buggy still includes cyclone, the entry of exit linkage cyclone of the integrative stove of buggy coking activation, one side export of cyclone links to each other with the entry of active coke powder cooler, cyclone's the export of the other side links to each other with coal gas tar purification and separation device's entry, the export of active coke powder cooler is linked together with the entry in active coke powder storage storehouse, coal gas tar purification and separation device's export links to each other with the entry of concurrent firing combustion chamber, the export of concurrent firing combustion chamber is linked together with the entry of the integrative stove of institute's electric coal powder coking activation, the flue gas of concurrent firing chamber also can be as the heating source of the integrative stove of buggy activation.
Furthermore, the coal gas tar purification and separation device also comprises a tar storage tank and a coal gas storage tank. The coal gas tar purification and separation device carries out harmless treatment on coal gas generated by coking and activating coal powder or waste gas, waste water and waste residue generated by purification treatment, thereby reducing the investment of flue gas treatment and waste water and waste residue treatment facilities of projects.
Further, the export of utility boiler with the entry of the integrative stove of buggy coking activation passes through the pipeline and links to each other, the pipeline includes flue gas pipeline and steam conveying pipeline, flue gas pipeline includes the supporting layer, two set up the flame retardant coating between the supporting layer, lean on outer the periphery of supporting layer sets up the heat preservation the periphery of heat preservation sets up the outsourcing material layer, flue gas pipeline cross section is square or circular. The arrangement of the pipeline ensures the long-term stable use of the pipeline and the personal safety of staff nearby the pipeline, and reduces the temperature of the outer surface of the pipeline and the heat dissipation loss of the pipeline.
Furthermore, still be equipped with condenser tube in the heat preservation, condenser tube's axial with flue gas pipeline's axial direction is parallel, condenser tube sets up to many, many condenser tubes along the circumference side distribution of heat preservation. The cooling water pipe can collect heat, so that the cooling water pipe is used for supplying heat to the outside or recovering waste heat.
Further, the utility boiler still includes the powder process system, the powder process system includes coal pulverizer and wind powder conveying system, one side of powder process system with integrative stove of buggy coking activation links to each other. The powder process system is arranged to provide raw materials for the coal powder coking and activating integrated furnace.
A process for preparing active coke powder by using coal dust of a thermal power plant uses the system for preparing active coke powder by using coal dust of the thermal power plant, and the process comprises the following steps:
1) raw coal enters a power station boiler to be combusted, steam is generated to drive a power generation device to operate, and generated electric power is transmitted to a power grid;
2) at least one of the flue gas in the power station boiler, the flue gas in the electric heater and the flue gas in the heat-supplementing combustion chamber is used as a heating heat source of the pulverized coal coking and activating integrated furnace to carry out coking treatment on the pulverized coal;
3) activating the coked coal powder by using water vapor of a power station boiler as an activating agent;
4) the raw gas and active coke powder mixture generated by the coal powder coking and activating integrated furnace enters a cyclone separator for separation, the separated solid particles enter an active coke powder cooler for cooling, and the raw gas separated by the cyclone separator enters a gas tar purification and separation device;
5) conveying the raw gas to a gas tar purification and separation device for treatment to obtain clean gas and tar, wherein the tar enters a tar storage tank, and the gas enters the gas storage tank or enters a heat-supplement combustion chamber for combustion;
6) and after the active coke powder enters an active coke powder cooler for cooling, sending the active coke powder into an active coke powder storage bin for storage.
The process for preparing the active coke powder by using the coal powder in the thermal power plant realizes the coal pyrolysis and coking process with low energy consumption and the activation process after coking the coal powder with high efficiency, and reduces the investment of flue gas treatment and waste water and waste residue treatment facilities of the project.
Further, the temperature range of the flue gas is 800-1400 ℃. The temperature of the flue gas is set to 800-1400 ℃, and a heat source is provided for coal powder coking.
Furthermore, the electric heater adopts any one or combination of an electric heating pipe, electromagnetic heating, electrode discharge heating or high-voltage arc heating mode. The electric heater is arranged at 800-1400 ℃ and provides a heat source for coal powder coking.
A peak regulation control method of a system for preparing active coke powder from coal dust of a thermal power plant comprises the following steps:
1) dispatching a power grid to issue load demand data of the thermal power plant in the next period, issuing a control instruction by the thermal power plant according to the peak regulation demand of the power grid, and realizing load peak regulation control of the thermal power plant by utilizing at least one of a technical means of extracting smoke from a boiler of the power station and peak regulation of an electric heater of an integrated furnace;
2) the control instruction directly requires the load of the power station boiler to be reduced, and the flow of the flue gas led out from the power station boiler is controlled by controlling the opening of a baffle plate on a flue gas pipeline and the power of an induced draft fan, so that the evaporation capacity of water vapor of the power station boiler is reduced, and the load of the power station boiler is reduced to a value required by the control instruction;
3) and if the load of the boiler of the power station of the thermal power plant is reduced to the minimum load value of safe operation of the boiler, or the power grid dispatching requires the thermal power plant to quickly respond to the load reduction requirement, starting the electric heater of the pulverized coal coking and activation integrated furnace, and meeting the peak regulation requirement of quickly reducing the grid electricity quantity of the thermal power plant by increasing the power consumption of the electric heater.
According to the load peak regulation control method, the power station boiler smoke is extracted and the electric heater is put into the power station boiler smoke, so that the peak regulation of the power station boiler and the whole thermal power plant can be stably operated, and the peak regulation income of the thermal power plant is increased.
Compared with the prior art, the invention has the advantages that:
1) the system and the process for preparing the active coke powder by using the coal powder in the thermal power plant and the peak regulation control method provided by the invention have the advantages that the coal powder is coked by using at least one of the flue gas of a power plant boiler, the flue gas of an electric heater and the flue gas of a heat-supplementing combustion chamber, so that the coal pyrolysis and coking process with low energy consumption is realized;
2) the system and the process for preparing the active coke powder by the coal powder of the thermal power plant and the peak regulation control method utilize the water vapor of a power plant boiler as the low-cost activating agent of the coking coal powder, thereby efficiently realizing the activation process after coking the coal powder;
3) the system and the process for preparing the active coke powder by the coal powder in the thermal power plant and the peak regulation control method have the advantages that coal gas generated by coking and activating the coal powder or waste gas, waste water and waste residue generated by purifying treatment are directly subjected to harmless treatment by using treatment facilities in the thermal power plant, so that the investment of flue gas treatment and waste water and waste residue treatment facilities of a project is reduced;
4) the system and the process for preparing the active coke powder by the pulverized coal of the thermal power plant and the peak regulation control method realize the stable operation of the peak regulation of the power station boiler and the whole thermal power plant by extracting the flue gas of the power station boiler and throwing the flue gas into the electric heater, and increase the peak regulation income of the thermal power plant.
Drawings
FIG. 1 is a schematic diagram of a system for producing active coke powder from coal dust in a thermal power plant according to the present invention;
FIG. 2 is a schematic diagram of another embodiment of a system for producing activated coke powder from pulverized coal of a thermal power plant according to the present invention;
FIG. 3 is a schematic diagram of another embodiment of a system for producing activated coke powder from pulverized coal of a thermal power plant according to the present invention;
FIG. 4 is a schematic structural diagram of a flue gas pipeline of the system for preparing active coke powder from pulverized coal in a thermal power plant according to the present invention;
FIG. 5 is another schematic structural diagram of a flue gas pipeline of the system for preparing active coke powder from pulverized coal in a thermal power plant according to the present invention.
1-power station boiler, 11-powder making system, 111-coal mill, 112-air powder conveying system, 2-coal powder coking and activating integrated furnace, 21-electric heater, 3-pipeline, 31-flue gas pipeline, 311-fire-resisting layer, 312-supporting layer, 313-heat-insulating layer, 314-cooling water pipe, 32-water vapor conveying pipeline, 4-cyclone separator, 5-active coke powder cooler, 6-active coke powder storage bin, 7-gas tar purifying and separating device, 71-tar storage tank, 72-gas storage tank and 8-heat-compensating combustion chamber.
Detailed Description
Example 1
A system for preparing active coke powder from pulverized coal in a thermal power plant comprises a power station boiler 1, wherein the power station boiler 1 is used for burning raw coal to generate steam to drive a power generation device to operate and transmitting generated electric power to a power grid; still include buggy coking activation integrative stove 2, buggy coking activation integrative stove 2 is used for carrying out coking activation with the buggy, the export of power boiler 1 with the entry of buggy coking activation integrative stove 2 links to each other, be equipped with electric heater 21 in buggy coking activation integrative stove 2, the heating heat source of buggy coking activation integrative stove 1 is the flue gas or electric heater 21 of power boiler 1, the buggy is the steam of power boiler 1 in the activator source of coking activation integrative stove 2. The system for preparing the active coke powder by using the coal powder in the thermal power plant cokes the coal powder by using at least one of the flue gas of a power station boiler and an electric heater, so that the coal pyrolysis and coking process with low energy consumption is realized; the water vapor of the power station boiler is used as the low-cost activating agent for coking the coal powder, so that the activation process of the coked coal powder is realized efficiently.
The system for preparing the active coke powder from the pulverized coal in the thermal power plant also comprises a cyclone separator 4, wherein an outlet of the pulverized coal coking and activating integrated furnace 2 is connected with an inlet of the cyclone separator 4, and the cyclone separator 4 separates the raw coke oven gas generated by the pulverized coal coking and activating integrated furnace 2 from the active coke powder mixture; an outlet at one side of the cyclone separator 4 is connected with an inlet of an active coke powder cooler 5, the active coke powder cooler 5 is used for cooling activated coke powder, the active coke powder cooler 5 is connected with primary air or secondary air or boiler feed water or condensed water or heat supply network circulating water of a thermal power plant, and the primary air, the secondary air, the boiler feed water, the condensed water or the heat supply network circulating water are heated by utilizing the waste heat of the hot active coke powder; the export of another side of cyclone 4 links to each other with the entry of coal gas tar purification separator 7, and coal gas tar purification separator 7 is to the crude gas purification treatment that the buggy coking activation produced, the export of active coke powder cooler 5 is linked together with the entry of active coke powder warehouse 6, the export of coal gas tar purification separator 7 links to each other with the entry of heat recovery combustion chamber 8, heat recovery combustion chamber 8 burns the coal gas after purifying, the export of heat recovery combustion chamber 8 is linked together through the entry with the integrative stove 2 of the fine coal coking activation of institute's electric power, the flue gas of heat recovery combustion chamber 8 also can be as the heating source of the integrative stove 2 of buggy coking activation. The system for preparing the active coke powder by using the coal powder in the thermal power plant reduces the investment of flue gas treatment and waste water and waste residue treatment facilities of a project.
Specifically, the gas tar purification and separation device 7 further comprises a tar storage tank 71 and a gas storage tank 72. The coal gas tar purification and separation device 7 is used for purifying raw coal gas generated by coking and activating coal powder, the treated tar is introduced into a tar storage tank 71 for storage, one part of the treated coal gas is introduced into a coal gas storage tank 72 for storage or delivery, and the other part of the treated coal gas is introduced into a heat-supplementing combustion chamber 8 of the coal gas storage tank 72 for combustion. The coal gas tar purification and separation device 7 carries out harmless treatment on coal gas generated by coking and activating coal powder or waste gas, waste water and waste residue generated by purification treatment, thereby reducing the investment of flue gas treatment and waste water and waste residue treatment facilities of projects.
In addition, the gas tar purification and separation device 7 further comprises a direct cooling tower, an indirect cooling tower, a clarification tank, a mist catcher and an electric catcher (not shown in the figure) which are connected in sequence.
Specifically, an outlet of the utility boiler 1 is connected with an inlet of the pulverized coal coking and activating integrated furnace 2 through a pipeline 3, the pipeline 3 comprises a flue gas pipeline 31 and a water vapor conveying pipeline 32, the flue gas pipeline 31 comprises a fire-resistant layer 311, a support layer 312, a heat-insulating layer 313 and an outer-wrapping material layer 315, the flue gas pipeline 31 comprises the support layer 312, the fire-resistant layer 311 is arranged between the two support layers 312, the heat-insulating layer 313 is arranged on the periphery of the outer support layer 312, and the outer-wrapping material layer 315 is arranged on the periphery of the heat-insulating layer 313; as shown in fig. 4 and 5, the flue gas duct 31 has a circular or square cross section; more specifically, the flue gas duct 31 is provided with a baffle (not shown in the figure) for controlling the flow of the flue gas of the draft power station boiler 1.
More specifically, flue gas pipeline 31 is high temperature resistant flue gas pipeline, and the setting of high temperature resistant flue gas pipeline has guaranteed that the pipeline is stable for a long time to be used and staff's personal safety near the pipeline, has reduced the heat dissipation loss of pipeline surface temperature and pipeline.
More specifically, the steam delivery pipe 32 extracts steam from steam or a steam turbine (not shown) of the utility boiler 1 to introduce the steam into the pulverized coal coking and activating integrated furnace 2, and the steam is used as an activating agent to activate the coked pulverized coal in the integrated furnace. The steam is used as the activating agent, so that the cleaning agent is cleaner, has no impurities and cannot cause blockage to a conveying pipeline.
More specifically, a cooling water pipe 314 is further arranged in the insulating layer 313. The axial direction of the cooling water pipe 314 is parallel to the axial direction of the flue gas pipeline 31, the number of the cooling water pipes 314 is multiple, and the plurality of the cooling water pipes 314 are distributed along the circumferential side of the heat insulation layer 313. The cooling water in the cooling water pipe 314 comes from a thermal power plant steam-water system or a cooling water system or a heat supply network circulating water system. The cooling water pipe can collect heat, so that the cooling water pipe is used for supplying heat to the outside or recovering waste heat.
Specifically, utility boiler 1 still includes powder process system 11, powder process system 11 includes coal pulverizer 111 and wind powder conveying system 112, one side of powder process system 11 with integrative stove 2 of buggy coking activation links to each other.
More specifically, the coal pulverizing system 11 controls the particle size of the pulverized coal by using a coal mill 111, and the coal pulverizing system 11 controls the flow rate of the pulverized coal fed into the pulverized coal coking and activating integrated furnace 2 by using an air-powder conveying system 112.
A process for preparing active coke powder by using coal dust of a thermal power plant uses the system for preparing active coke powder by using coal dust of the thermal power plant, and the process comprises the following steps:
1) raw coal enters a power station boiler 1 to be combusted, steam is generated to drive a power generation device to operate, and generated electric power is transmitted to a power grid;
2) at least one of the flue gas in the power station boiler 1 and the flue gas in the electric heater 21 and the supplementary heating combustion chamber 8 is used as a heating heat source of the pulverized coal coking and activating integrated furnace 2 to carry out coking treatment on the pulverized coal;
3) the coked coal powder is activated by using water vapor of a power station boiler 1 as an activating agent;
4) the raw gas and active coke powder mixture generated by the coal powder coking and activating integrated furnace 2 enters a cyclone separator 4 for separation, the separated solid particles enter an active coke powder cooler 5 for cooling, and the raw gas separated by the cyclone separator 4 enters a gas tar purification and separation device 7;
5) conveying the raw gas to a gas tar purification and separation device 7 for treatment to obtain clean gas and tar, wherein the tar enters a tar storage tank 71, and the gas enters a gas storage tank 72 or enters a heat-supplement combustion chamber 8 for combustion;
6) after entering the active coke powder cooler 5 for cooling, the active coke powder is sent to the active coke powder storage 6 for storage.
The process directly utilizes the flue gas of the boiler of the power station to coke the coal powder, thus realizing the coal pyrolysis and coking process with low energy consumption; the process utilizes the water vapor of a power station boiler as an activating agent of coking coal dust with low cost, thereby efficiently realizing the activation process after coking of the coal dust.
Specifically, the temperature range of the flue gas is 800-1400 ℃. The temperature of the flue gas is set to 800-1400 ℃, and a heat source is provided for coal powder coking.
Specifically, the electric heater adopts any one or combination of an electric heating pipe, electromagnetic heating, electrode discharge heating or high-voltage arc heating mode. The electric heater is arranged at 800-1400 ℃ and provides a heat source for coal powder coking.
Specifically, the active coke powder cooler 5 is connected with primary air or secondary air or boiler feed water or condensed water or heat supply network circulating water of a thermal power plant, and the primary air, the secondary air, the boiler feed water, the condensed water or the heat supply network circulating water are heated by utilizing the waste heat of the thermal active coke powder.
A peak regulation control method of a system for preparing active coke powder from coal dust of a thermal power plant comprises the following steps:
1) dispatching a power grid to issue load demand data of the thermal power plant in the next period, issuing a control instruction by the thermal power plant according to the peak regulation demand of the power grid, and realizing load peak regulation control of the thermal power plant by utilizing at least one of a technical means of extracting smoke from a boiler of the power station and peak regulation or a peak regulation means of an electric heater 21 of an integrated furnace;
2) the control instruction directly requires the load of the utility boiler 1 to be reduced, and then the flue gas flow led out from the utility boiler 1 is controlled by controlling the opening of a baffle plate on the flue gas pipeline 31 and the power of an induced draft fan, so that the evaporation capacity of the water vapor of the utility boiler 1 is reduced, and the load of the utility boiler 1 is reduced to the value required by the control instruction;
3) if the load of the power station boiler 1 of the thermal power plant is reduced to the minimum load value of safe operation of the boiler, or the power grid dispatching requires the thermal power plant to quickly respond to the load reduction requirement, the electric heater 21 of the pulverized coal coking and activation integrated furnace 2 is started, and the peak regulation requirement of quickly reducing the grid electricity quantity of the thermal power plant is met by increasing the power consumption of the electric heater 21.
According to the load peak regulation control method, the power station boiler smoke is extracted and the electric heater is put into the power station boiler smoke, so that the peak regulation of the power station boiler and the whole thermal power plant can be stably operated, and the peak regulation income of the thermal power plant is increased.
Example 2
Different from the embodiment 1, as shown in fig. 2, the heat sources of the pulverized coal coking are the electric heater 21 and the flue gas of the heat-supplement combustion chamber 8, wherein the main heat source is the electric heater 21, the flue gas of the heat-supplement combustion chamber 8 is an auxiliary heat source, and the heat sources do not include the flue gas of the utility boiler 1.
The main heat source is the electric heater 21, and the heat source is clean and does not pollute the environment; the flue gas of the heat-supplementing combustion chamber 8 is an auxiliary heat source, and the waste gas is reused.
Example 3
Unlike embodiment 1, as shown in fig. 3, the heat sources for pulverized coal coking are the flue gas of the utility boiler 1 and the flue gas of the supplementary heating combustor 8, and the heat sources do not include the electric heater 21.
The pulverized coal is coked in the flue gas of the power station boiler 1 and the flue gas of the heat-supplementing combustion chamber 8, so that the coal pyrolysis and coking process with low energy consumption is realized, the flue gas of the power station boiler 1 is maximally utilized, and the waste coal gas is reused.
Example 4
Unlike example 1, the heat source for coal dust coking is flue gas of the utility boiler 1, and the heat source does not include flue gas of the electric heater 21 and the supplementary heating combustor 8.
The pulverized coal is coked in the flue gas of the power station boiler 1 and the flue gas of the heat recovery combustion chamber 8, so that the coal pyrolysis and coking process with low energy consumption is realized, and the flue gas of the power station boiler 1 is maximally utilized.
Compared with the prior art, the invention has the advantages that:
1) the system and the process for preparing the active coke powder by using the coal powder in the thermal power plant and the peak regulation control method provided by the invention have the advantages that the coal powder is coked by using at least one of the flue gas of a power plant boiler, the flue gas of an electric heater and the flue gas of a heat-supplementing combustion chamber, so that the coal pyrolysis and coking process with low energy consumption is realized;
2) the system and the process for preparing the active coke powder by the coal powder of the thermal power plant and the peak regulation control method utilize the water vapor of a power plant boiler as the low-cost activating agent of the coking coal powder, thereby efficiently realizing the activation process after coking the coal powder;
3) the system and the process for preparing the active coke powder by the coal powder in the thermal power plant and the peak regulation control method have the advantages that coal gas generated by coking and activating the coal powder or waste gas, waste water and waste residue generated by purifying treatment are directly subjected to harmless treatment by using treatment facilities in the thermal power plant, so that the investment of flue gas treatment and waste water and waste residue treatment facilities of a project is reduced;
4) the system and the process for preparing the active coke powder by the pulverized coal of the thermal power plant and the peak regulation control method realize the stable operation of the peak regulation of the power station boiler and the whole thermal power plant by extracting the flue gas of the power station boiler and throwing the flue gas into the electric heater, and increase the peak regulation income of the thermal power plant.
It is obvious that the above embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, those skilled in the art should also include various changes, modifications, substitutions and improvements without creative efforts to the embodiments.
Claims (10)
1. The utility model provides a system for active coke powder is prepared to coal powder of thermal power plant, its characterized in that, including power boiler (1) and buggy coking activation integrative stove (2), the export of power boiler (1) with the entry of buggy coking activation integrative stove (2) links to each other, be equipped with electric heater (21) in buggy coking activation integrative stove (2), the heating heat source of buggy coking activation integrative stove (2) is flue gas and/or electric heater (21) of power boiler (1), the steam that the coal powder was power boiler (1) in the activator source of coking activation integrative stove (2).
2. The system for preparing active coke powder from pulverized coal of a thermal power plant according to claim 1, characterized in that the system for preparing active coke powder from pulverized coal of a thermal power plant further comprises a cyclone separator (4), the outlet of the pulverized coal coking and activating integrated furnace (2) is connected with the inlet of the cyclone separator (4), the outlet of one side of the cyclone separator (4) is connected with the inlet of the active coke powder cooler (5), the outlet of the other side of the cyclone separator (4) is connected with the inlet of the coal gas tar purification and separation device (7), the outlet of the active coke powder cooler (5) is communicated with the inlet of the active coke powder storage bin (6), the outlet of the coal gas tar purification and separation device (7) is connected with the inlet of the heat-supplement combustion chamber (8), the outlet of the heat-supplement combustion chamber (8) is communicated with the inlet of the pulverized coal coking and activating integrated furnace (2), the flue gas of the heat-supplementing combustion chamber (8) can also be used as a heating source of the pulverized coal coking and activating integrated furnace (2).
3. The system for preparing active coke powder from coal dust in a thermal power plant according to claim 2, wherein the coal gas tar purification and separation device (7) further comprises a tar storage tank (71) and a coal gas storage tank (72).
4. The system for preparing active coke powder from coal dust in a thermal power plant according to claim 1, wherein an outlet of the power station boiler (1) is connected with an inlet of the coal dust coking and activating integrated furnace (2) through a pipeline (3), the pipeline (3) comprises a flue gas pipeline (31) and a water vapor conveying pipeline (32), the flue gas pipeline (31) comprises a supporting layer (312), a fire-resistant layer (311) is arranged between the two supporting layers (312), an insulating layer (313) is arranged on the periphery of the supporting layer (312) close to the outside, an outer covering material layer (315) is arranged on the periphery of the insulating layer (313), and the cross section of the flue gas pipeline (31) is square or circular.
5. The system for preparing active coke powder from coal dust in a thermal power plant according to claim 4, wherein a cooling water pipe (314) is further arranged in the heat insulation layer (313), the axial direction of the cooling water pipe (314) is parallel to the axial direction of the flue gas pipeline (31), the number of the cooling water pipes (314) is multiple, and the multiple cooling water pipes (314) are distributed along the circumferential side of the heat insulation layer (313).
6. The system for preparing the active coke powder from the pulverized coal of the thermal power plant according to claim 1, wherein the utility boiler (1) further comprises a coal pulverizing system (11), the coal pulverizing system (11) comprises a coal mill (111) and an air powder conveying system (112), and one side of the coal pulverizing system (11) is connected with the pulverized coal coking and activating integrated furnace (2).
7. A process for preparing active coke powder from coal dust of a thermal power plant, which is characterized in that the process uses the system for preparing active coke powder from coal dust of a thermal power plant according to any one of claims 1 to 5, and the process comprises the following steps:
1) raw coal enters a power station boiler (1) for internal combustion to generate steam to drive a power generation device to operate, and the generated electric power is transmitted to a power grid;
2) at least one of flue gas in the power station boiler (1), flue gas in the electric heater (21) and flue gas in the heat recovery combustion chamber (8) is used as a heating heat source of the pulverized coal coking and activating integrated furnace to carry out coking treatment on pulverized coal;
3) the coked coal powder is activated by using water vapor of a power station boiler (1) as an activating agent;
4) raw coke gas and active coke powder mixture generated by the coal powder coking and activating integrated furnace (2) enter a cyclone separator (4) for separation, separated solid particles enter an active coke powder cooler (5) for cooling, and the raw coke gas separated by the cyclone separator (4) enters a gas tar purification and separation device (7);
5) conveying the raw gas to a gas tar purification and separation device (7) for treatment to obtain clean gas and tar, wherein the tar enters a tar storage tank (71), and the gas enters a gas storage tank (72) or enters a heat-supplement combustion chamber (8) for combustion;
6) after entering an active coke powder cooler (5) for cooling, the active coke powder is sent into an active coke powder storage bin (6) for storage.
8. The process for preparing active coke powder from pulverized coal of a thermal power plant according to claim 7, wherein the temperature range of the flue gas is 800-1400 ℃.
9. The process for preparing activated coke powder from pulverized coal in a thermal power plant according to claim 7, wherein the electric heater adopts any one or combination of electric heating tubes, electromagnetic heating, electrode discharge heating or high-voltage arc heating.
10. A peak shaving control method for a system for preparing active coke powder from pulverized coal of a thermal power plant, which is characterized in that the method uses the system and the process for preparing active coke powder from pulverized coal of a thermal power plant according to any one of claims 1 to 9, and the method comprises the following steps:
1) dispatching a power grid to issue load demand data of the thermal power plant in the next period, issuing a control instruction by the thermal power plant according to the peak regulation demand of the power grid, and realizing load peak regulation control of the thermal power plant by using at least one of a technical means of extracting smoke from a boiler (1) of a power station or a peak regulation means of an electric heater (21) of an integrated furnace;
2) the control instruction directly requires the load of the utility boiler (1) to be reduced, and the flow of the flue gas led out from the utility boiler (1) is controlled by controlling the opening of a baffle plate on a flue gas pipeline (31) and the power of an induced draft fan, so that the evaporation capacity of the water vapor of the utility boiler (1) is reduced, and the load of the utility boiler (1) is reduced to a value required by the control instruction;
3) if the load of the power station boiler (1) of the thermal power plant is reduced to the minimum load value of safe operation of the boiler, or the power grid dispatching requires the rapid response load reduction requirement of the thermal power plant, the electric heater (21) of the pulverized coal coking and activation integrated furnace (2) is started, and the peak shaving requirement of the thermal power plant for rapidly reducing the grid electricity quantity is met by increasing the power consumption of the electric heater (21).
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| CN201911258713.7A CN112940760A (en) | 2019-12-10 | 2019-12-10 | System and process for preparing active coke powder in thermal power plant and peak regulation control method |
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| CN201911258713.7A CN112940760A (en) | 2019-12-10 | 2019-12-10 | System and process for preparing active coke powder in thermal power plant and peak regulation control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114452962A (en) * | 2022-02-11 | 2022-05-10 | 青岛新太平洋节能环保集团有限公司 | Active coke regeneration and tail gas treatment system and treatment process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114452962A (en) * | 2022-02-11 | 2022-05-10 | 青岛新太平洋节能环保集团有限公司 | Active coke regeneration and tail gas treatment system and treatment process thereof |
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