CN112675692B - Red mud harmless treatment system based on circulating fluidized bed boiler and working method thereof - Google Patents
Red mud harmless treatment system based on circulating fluidized bed boiler and working method thereof Download PDFInfo
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Abstract
The invention discloses a red mud harmless treatment system based on a circulating fluidized bed boiler and a working method thereof, and belongs to the technical field of industrial solid waste treatment and waste utilization in the metallurgical industry. The bottom of the red mud slurry dissolving tank is provided with a precipitation discharge port, the red mud slurry dissolving tank is connected with a reducing agent slurry tank through a red mud slurry conveying pipe, and the red mud slurry conveying pipe is provided with a red mud slurry transfer pump; the ammonia water storage tank is connected with the reducing agent slurry tank through an ammonia water conveying pipe, and an ammonia water transfer pump is arranged on the ammonia water conveying pipe; the reducing agent slurry outlet is connected with a reducing agent slurry injection system through a reducing agent slurry conveying system, and the reducing agent slurry injection system is arranged in a horizontal flue of the circulating fluidized bed boiler. The invention realizes the harmless treatment of the red mud, improves the denitration efficiency of the circulating fluidized bed boiler, reduces pollution, lowers enterprise cost and realizes huge social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of industrial solid waste treatment and waste utilization in metallurgical industry, and particularly relates to a red mud harmless treatment system based on a circulating fluidized bed boiler and a working method thereof.
Background
The red mud is an industrial waste generated in the process of producing alumina in the metallurgical industry, and the red mud slurry presents strong basicity, is called as the red mud because of large iron oxide content and similar appearance to red clay. Due to different ore tastes, production methods and technical levels, about 1.0-1.8 tons of red mud is discharged when 1 ton of alumina is produced. The main component of the red mud is SiO2、Al2O3、CaO、Fe2O3The solid waste belongs to the first general industrial solid waste, has stable physical characteristics and is generally difficult to directly utilize.
Research shows that the red mud has no calorific value, but contains abundant fine solid particles, and the main components of the particles are iron oxide and aluminum oxide, so that the red mud has a large specific surface area; in addition, alumina and iron oxide are also good denitration catalysts. If the red mud is directly discarded, on one hand, the environment is polluted, and on the other hand, the iron oxide and the aluminum oxide in the red mud cannot be effectively utilized.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a red mud harmless treatment system based on a circulating fluidized bed boiler and a working method thereof, the system is reasonable in design, the red mud harmless treatment is realized, the denitration efficiency of the circulating fluidized bed boiler is improved, the pollution is reduced, the enterprise cost is reduced, and meanwhile, the huge social benefit and economic benefit are realized.
The invention is realized by the following technical scheme:
the invention discloses a red mud harmless treatment system based on a circulating fluidized bed boiler, which comprises a red mud slurry dissolving tank, an ammonia water storage tank, a reducing agent slurry conveying system and a reducing agent slurry injection system;
the reducing agent slurry tank is provided with a monitoring instrument, a reducing agent slurry outlet, a red mud slurry inlet and an ammonia water inlet, a slurry tank stirrer is arranged in the reducing agent slurry tank, and the slurry tank stirrer is connected with a stirrer motor;
the bottom of the red mud slurry dissolving tank is provided with a precipitation discharge port, the red mud slurry dissolving tank is connected with a red mud slurry inlet through a red mud slurry conveying pipe, and the red mud slurry conveying pipe is provided with a red mud slurry transfer pump; the ammonia water storage tank is connected with the ammonia water inlet through an ammonia water conveying pipe, and an ammonia water transfer pump is arranged on the ammonia water conveying pipe; the reducing agent slurry outlet is connected with a reducing agent slurry injection system through a reducing agent slurry conveying system, and the reducing agent slurry injection system is arranged in a horizontal flue of the circulating fluidized bed boiler.
Preferably, the red mud slurry dissolving tank is connected with a dilution water inlet pipe, and a slurry tank heating device and a slurry tank stirrer are arranged in the red mud slurry dissolving tank.
Preferably, the ammonia water transfer pump is a variable frequency pump.
Preferably, a slurry tank heating device is further arranged in the reducing agent slurry tank, and the monitoring instruments comprise a thermometer, a pressure gauge, a densimeter and a visual liquid level meter.
Preferably, the reducing agent slurry conveying system comprises a main path, wherein a reducing agent slurry conveying pump and a reducing agent slurry conveying pump outlet isolation valve are arranged on the main path, and the reducing agent slurry conveying pump is a variable frequency pump; the main path is respectively connected with a conveying branch and a back washing branch, the conveying branch is connected with a reducing agent slurry injection system, and a conveying branch isolating valve is arranged on the conveying branch; the back washing branch comprises a back washing water inlet pipeline and a back washing sewage discharge pipeline, wherein a back washing water inlet pipeline isolation valve is arranged on the back washing water inlet pipeline, and a back washing sewage discharge stop valve is arranged on the back washing sewage discharge pipeline.
Preferably, the reducing agent slurry injection system comprises a distribution main pipe, a plurality of branch pipes and spray guns, the distribution main pipe is connected with the reducing agent slurry conveying system, the distribution main pipe is respectively connected with the branch pipes, each branch pipe is connected with one spray gun, and the spray guns are arranged on two sides of the horizontal flue.
Further preferably, the spray gun is a compressed air atomization spray gun, and a plurality of spray guns are distributed on two sides of the horizontal flue in a staggered manner.
Further preferably, the branch pipe comprises a hard pipe section and a hose section, two ends of the hard pipe section are respectively connected with the distribution main pipe and the hose section, the hose section is connected with the spray gun through a quick connector, and the hard pipe section is provided with a branch pipe quick-cutting valve and a visual flowmeter.
Preferably, liquid level interlocking protection is arranged among the red mud slurry transfer pump, the ammonia water transfer pump and the reducing agent slurry tank, and an emergency stop switch is arranged in the reducing agent slurry conveying system.
The invention discloses a working method of the red mud harmless treatment system based on the circulating fluidized bed boiler, which comprises the following steps:
after the red mud enters a red mud slurry dissolving tank, diluting and dissolving the red mud into red mud fine slurry, and after precipitation, insoluble slag enters a coal yard from a precipitation outlet at the bottom to be mixed with raw coal and enters a coal bunker; conveying the red mud fine slurry to a reducing agent slurry tank by a red mud slurry transfer pump, and blending with ammonia water; conveying the ammonia water in the ammonia water storage tank to a reducing agent slurry tank through an ammonia water transfer pump; the red mud fine slurry and the ammonia water which are introduced into the reducing agent slurry tank are fully and uniformly mixed by a slurry tank stirrer for blending, the concentration of the ammonia water is flexibly controlled according to the emission value of the nitrogen oxide of the circulating fluidized bed boiler, and if the emission concentration of the nitrogen oxide of the boiler is low for a long time, the concentration of the ammonia water is reduced; parameters of the reducing agent slurry in the reducing agent slurry tank are monitored in real time through a monitoring instrument; the reducing agent slurry is conveyed to the reducing agent slurry injection system through the reducing agent slurry conveying system and then injected into the horizontal flue of the circulating fluidized bed boiler.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a red mud harmless treatment system based on a circulating fluidized bed boiler, and the circulating fluidized bed boiler has the advantages of wide fuel adaptability and Nitric Oxide (NO)X) The method has the characteristics of low emission, easy realization of ash utilization and the like, realizes large-scale engineering utilization of the red mud by utilizing the SNCR denitration system of the circulating fluidized bed boiler, and realizes harmless treatment of the red mud, improves the denitration efficiency, reduces the pollution of the part of chemical industry solid waste to water resources and land resources, and simultaneously can ensure the dust, SO and the like generated in the comprehensive treatment process by utilizing the in-furnace desulfurization system, the dust removal system, the demercuration system and the denitration system which are already arranged in the power plant2、NOXThe discharge amount meets the national environmental protection standard, and the discharge amount is sprayed into the boiler after being fully mixed with the ammonia water uniformly, so that the circulating ash amount of the circulating fluidized bed boiler can be increased, and the circulating fluidized bed boiler has better practical significance for burning low-ash coal.
The reducing agent slurry is conveyed to the reducing agent slurry injection system by the reducing agent slurry conveying system and is injected in the horizontal flue, and the injection amount of the reducing agent slurry is controlled by the reducing agent slurry conveying system. The red mud is subjected to harmless treatment by the large circulating fluidized bed boiler, so that the treatment cost of pollutants in enterprises can be reduced, and after the red mud is subjected to high-temperature treatment, the formed ash contains rich microelements such as calcium, magnesium, potassium, sodium phosphate and the like, so that the method has great benefits for soil remediation and crop fertilization, and therefore, the red mud is subjected to comprehensive treatment by the SNCR (selective non-catalytic reduction) denitration system of the circulating fluidized bed boiler, so that the real harmless treatment can be realized, and meanwhile, great social benefits and economic benefits are realized.
Further, the slurry tank stirrer can ensure that the red mud is fully dissolved; the slurry tank heating device can heat at a lower temperature, so that the solubility of the red mud is improved.
Furthermore, the ammonia water transfer pump adopts a variable frequency pump, and can meet the requirement of flexible control on the density of the reducing agent slurry.
Furthermore, the density meter can monitor the density of the reducing agent slurry in the reducing agent slurry tank in real time, and the visual liquid level meter is used for monitoring the liquid level in real time, so that the safe and stable operation of the system is ensured.
Furthermore, a back-flushing system is arranged in the reducing agent slurry conveying system, so that the residual reducing agent slurry in the pipeline can be cleaned conveniently when the system is started and stopped.
Further, the distribution main pipe can rapidly and uniformly distribute the flow in each branch pipe, spraying is carried out on two sides of the horizontal flue, and the effect is good.
Furthermore, the spray gun adopts a compressed air atomization spray gun, and the spray is uniform; the spray guns are staggered and uniformly distributed on two sides of the horizontal flue to prevent the opposite impact.
Furthermore, the visual flow meter is convenient for observing the running condition of the atomizing spray gun and finding blockage in time; the branch pipe quick-cutting valve can facilitate the overhaul and the replacement of the spray gun; the hose section can effectively avoid pipeline damage caused by expansion.
Furthermore, liquid level interlocking protection is arranged among the red mud slurry transfer pump, the ammonia water transfer pump and the reducing agent slurry tank, and an emergency stop switch is arranged in the reducing agent slurry conveying system, so that emergency stop can be conveniently realized under emergency conditions, and the safety and the stability of system operation are improved.
The working method of the red mud harmless treatment system based on the circulating fluidized bed boiler disclosed by the invention has the advantages of high automation degree, realization of the harmless treatment of the red mud, improvement of the denitration efficiency of the circulating fluidized bed boiler, reduction of pollution, reduction of enterprise cost, realization of huge social and economic benefits and good application prospect.
Drawings
FIG. 1 is a schematic view of the system of the present invention as a whole;
FIG. 2 is a process flow diagram of the present invention;
FIG. 3 is a schematic diagram of a reductant slurry delivery system of the present invention;
FIG. 4 is a schematic structural diagram of a reducing agent slurry tank according to the present invention;
FIG. 5 is a schematic structural view of a red mud slurry dissolving tank according to the present invention;
FIG. 6 is a schematic front view of the arrangement of the spray guns in the horizontal flue of the present invention;
FIG. 7 is a schematic perspective view of the placement of the spray guns in the horizontal flue of the present invention;
FIG. 8 is a schematic diagram of a reductant slurry injection system of the present invention.
In the figure: 1-red mud tank truck, 2-ammonia water tank truck, 3-red mud slurry dissolving tank, 3-1-dilution water inlet pipe, 3-2-slurry tank heating device, 3-3-slurry tank stirrer, 4-ammonia water storage tank, 5-red mud slurry transfer pump, 6-ammonia water transfer pump, 7-reducing agent slurry tank, 7-1-slurry tank heating device, 7-2-slurry tank stirrer, 7-3-stirrer motor, 7-4-monitoring instrument, 8-reducing agent slurry conveying system, 8-1-reducing agent slurry conveying pump, 8-2-reducing agent slurry conveying pump outlet isolating valve, 8-3-conveying branch isolating valve, 8-4-backwashing water inlet pipeline isolating valve, 8-1-dilution water inlet pipe, 3-2-slurry tank heating device, 7-2-slurry tank stirrer, 7-3-stirrer motor, 7-4-monitoring instrument, 8-reducing agent slurry conveying system, 8-1-reducing agent slurry conveying pump, 8-2-reducing agent slurry conveying pump outlet isolating valve, 8-3-conveying branch isolating valve, 8-4-backwashing water inlet pipe isolating valve, 8-4-reverse flushing water inlet pipe, 3-dilution water inlet pipe, 3-1-dilution water inlet pipe, 3-1-2-dilution water inlet pipe, 3-2-slurry tank heater, 7-2-slurry tank, 7-2-reducing agent, 8-5-back flushing blowdown stop valve, 9-reducing agent slurry injection system, 9-1-distribution main pipe, 9-2-branch pipe, 9-3-spray gun, 9-4-branch pipe fast-cutting valve, 9-5-visual flowmeter and 10-horizontal flue.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the invention:
referring to fig. 1, the red mud harmless treatment system based on the circulating fluidized bed boiler of the present invention comprises a red mud slurry dissolving tank 3, an ammonia water storage tank 4, a reducing agent slurry tank 7, a reducing agent slurry conveying system 8 and a reducing agent slurry injection system 9.
Referring to fig. 4, a reducing agent slurry tank 7 is provided with a monitoring instrument 7-4, a reducing agent slurry outlet, a red mud slurry inlet and an ammonia water inlet, and the monitoring instrument 7-4 comprises a thermometer, a pressure gauge, a densimeter and a visual liquid level meter. A slurry tank heating device 7-1 and a slurry tank stirrer 7-2 are arranged in the reducing agent slurry tank 7, and the slurry tank stirrer 7-2 is connected with a stirrer motor 7-3; the slurry tank heating device 7-1 can adopt a steam heating pipeline.
As shown in fig. 5, a red mud dissolving tank 3 is connected with a dilution water inlet pipe 3-1, the bottom of the red mud dissolving tank is provided with a precipitation outlet, the red mud dissolving tank 3 is connected with a red mud slurry inlet through a red mud slurry conveying pipe, and the red mud slurry conveying pipe is provided with a red mud slurry transfer pump 5; a slurry tank heating device 3-2 and a slurry tank stirrer 3-3 are arranged in the red mud slurry dissolving tank 3. The red mud slurry transfer pump 5 can be controlled by frequency conversion or fixed frequency.
The ammonia storage tank 4 is connected with an ammonia inlet through an ammonia conveying pipe, and an ammonia transfer pump 6 is arranged on the ammonia conveying pipe. Preferably, the ammonia water transfer pump 6 is a variable frequency pump.
The reducing agent slurry outlet is connected with a reducing agent slurry injection system 9 through a reducing agent slurry conveying system 8, and the reducing agent slurry injection system 9 is arranged in a horizontal flue 10 of the circulating fluidized bed boiler.
As shown in fig. 3, the reducing agent slurry conveying system 8 includes a main path, on which a reducing agent slurry conveying pump 8-1 and a reducing agent slurry conveying pump outlet isolation valve 8-2 are arranged, and the reducing agent slurry conveying pump 8-1 is a variable frequency pump; the main path is respectively connected with a conveying branch and a back washing branch, the conveying branch is connected with a reducing agent slurry injection system 9, and a conveying branch isolating valve 8-3 is arranged on the conveying branch; the back washing branch comprises a back washing water inlet pipeline and a back washing sewage discharge pipeline, wherein a back washing water inlet pipeline isolation valve 8-4 is arranged on the back washing water inlet pipeline, and a back washing sewage discharge stop valve 8-5 is arranged on the back washing sewage discharge pipeline.
As shown in fig. 8, the reducing agent slurry injection system 9 comprises a main distribution pipe 9-1, a plurality of branch pipes 9-2 and spray guns 9-3, the main distribution pipe 9-1 is connected with the reducing agent slurry delivery system 8, the main distribution pipe 9-1 is respectively connected with the branch pipes 9-2, each branch pipe 9-2 is connected with one spray gun 9-3, and the spray guns 9-3 are arranged at two sides of the horizontal flue 10. The spray gun 9-3 is preferably a compressed air atomization spray gun, and a plurality of spray guns 9-3 are staggered and uniformly distributed on two sides of the horizontal flue 10. The branch pipe 9-2 comprises a hard pipe section and a hose section, two ends of the hard pipe section are respectively connected with the distribution main pipe 9-1 and the hose section, the hose section is connected with the spray gun 9-3 through a quick connector, and the hard pipe section is provided with a branch pipe quick-cutting valve 9-4 and a visual flowmeter 9-5.
Referring to fig. 6 and 7, in one embodiment of the present invention, a plurality of spray guns 9-3 are arranged at an up-down staggered interval of 0.5m, a left-right staggered interval of 1m on both sides of a horizontal flue 10, and adjacent spray guns 9-3 are arranged at an up-down staggered interval of 0.8 m.
In a preferred embodiment of the invention, liquid level interlocking protection is arranged among the red mud slurry transfer pump 5, the ammonia water transfer pump 6 and the reducing agent slurry tank 7, and an emergency stop switch is arranged in the reducing agent slurry conveying system 8.
The working method of the red mud harmless treatment system based on the circulating fluidized bed boiler comprises the following steps:
referring to fig. 2, the red mud and the ammonia water are transported from the red mud tank car 1 and the ammonia water tank car 2 to the factory and then are discharged into the red mud slurry dissolving tank 3 and the ammonia water storage tank 4, respectively.
After red mud enters a red mud slurry dissolving tank 3, diluting by water fed by a dilution water inlet pipe 3-1, uniformly mixing by a slurry tank stirrer 3-3 to prepare red mud fine slurry, and after precipitation, insoluble slag enters a coal yard from a precipitation outlet at the bottom to be mixed with raw coal and enters a coal bunker; when the temperature is lower, a slurry pool heating device 3-2 is adopted for heating, and the red mud fine slurry is conveyed to a reducing agent slurry tank 7 by a red mud slurry transfer pump 5 and is prepared with ammonia water. The ammonia water in the ammonia water storage tank 4 is conveyed to the reducing agent slurry tank 7 through the ammonia water transfer pump 6, the red mud slurry transfer pump 5 can be fixed frequency or variable frequency, and the ammonia water transfer pump 6 is controlled by variable frequency, so that the density in the reducing agent slurry tank 7 can be conveniently controlled.
The red mud fine slurry and the ammonia water which are introduced into the reducing agent slurry tank 7 are fully and uniformly mixed by a slurry tank stirrer 7-2 for blending, the concentration of the ammonia water is flexibly controlled according to the emission value of the nitrogen oxide, and if the emission concentration of the nitrogen oxide of the boiler is low for a long time, the concentration of the ammonia water can be properly reduced. Parameters of the reducing agent slurry in the reducing agent slurry tank 7 are monitored in real time through a monitoring instrument 7-4, wherein the ammonia water introduction amount is flexibly controlled by adopting a variable-frequency ammonia water transfer pump 6 according to the display of a densimeter, a density calculation formula is arranged in a control system, and density display is carried out on a control panel, so that the density of the reducing agent slurry in the reducing agent slurry tank 7 is monitored in real time. And starting the heating device 7-1 of the slurry tank when the temperature is lower in winter, and ensuring that the viscosity of the reducing agent slurry meets the requirement.
The reducing agent slurry is conveyed through a reducing agent slurry conveying system 8, because the reducing agent slurry conveying pipeline is long in distance, a backwashing water inlet pipeline isolation valve 8-4 and a backwashing blowdown stop valve 8-5 must be opened before the system is stopped, backwashing water from the backwashing water inlet pipeline is used for cleaning the pipeline, an outlet isolation valve 8-2 and a conveying branch isolation valve 8-3 of the reducing agent slurry conveying pump are closed, residual slurry in the pipeline returns to a reducing agent slurry tank 7 from the backwashing blowdown pipeline, and the next system is convenient to start after the pipeline is cleaned.
The reducing agent slurry is directly conveyed into a reducing agent slurry injection system 9 arranged in a horizontal flue 10 of a circulating fluidized bed boiler by a reducing agent slurry conveying system 8, flow is uniformly distributed through a distribution main pipe 9-1, then the reducing agent slurry is injected through compressed air atomization spray guns 9-3 inserted at two sides of the horizontal flue 10, the spray guns 9-3 are arranged in a staggered manner from top to bottom and from left to right so as to achieve the effect of the maximum injection area, the reducing agent slurry is injected into the horizontal flue 10 and then reacts at the high temperature of 900 ℃, after the ammonia water in the reducing agent slurry is in surface contact with solid particles contained in red mud fine slurry in the reducing agent slurry under the condition of pyrolysis, the contact area with nitrogen oxides is larger, and the denitration effect is better than that of a denitration system which simply uses the ammonia water as the reducing agent.
The above description is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.
Claims (7)
1. A red mud harmless treatment system based on a circulating fluidized bed boiler is characterized by comprising a red mud slurry dissolving tank (3), an ammonia water storage tank (4), a reducing agent slurry tank (7), a reducing agent slurry conveying system (8) and a reducing agent slurry injection system (9);
a monitoring instrument (7-4), a reducing agent slurry outlet, a red mud slurry inlet and an ammonia water inlet are arranged on the reducing agent slurry tank (7), a slurry tank stirrer (7-2) is arranged in the reducing agent slurry tank (7), and the slurry tank stirrer (7-2) is connected with a stirrer motor (7-3);
a sediment discharge port is arranged at the bottom of the red mud slurry dissolving tank (3), the red mud slurry dissolving tank (3) is connected with a red mud slurry inlet through a red mud slurry conveying pipe, and a red mud slurry transfer pump (5) is arranged on the red mud slurry conveying pipe; the ammonia water storage tank (4) is connected with an ammonia water inlet through an ammonia water conveying pipe, and an ammonia water transfer pump (6) is arranged on the ammonia water conveying pipe; the reducing agent slurry outlet is connected with a reducing agent slurry injection system (9) through a reducing agent slurry conveying system (8), and the reducing agent slurry injection system (9) is arranged in a horizontal flue (10) of the circulating fluidized bed boiler;
the reducing agent slurry injection system (9) comprises a distribution main pipe (9-1), a plurality of branch pipes (9-2) and spray guns (9-3), the distribution main pipe (9-1) is connected with the reducing agent slurry conveying system (8), the distribution main pipe (9-1) is respectively connected with the branch pipes (9-2), each branch pipe (9-2) is connected with one spray gun (9-3), and the spray guns (9-3) are arranged on two sides of a horizontal flue (10); the spray guns (9-3) are compressed air atomization spray guns, and a plurality of spray guns (9-3) are distributed on two sides of the horizontal flue (10) in a staggered manner; the branch pipe (9-2) comprises a hard pipe section and a hose section, two ends of the hard pipe section are respectively connected with the distribution main pipe (9-1) and the hose section, the hose section is connected with the spray gun (9-3) through a quick connector, and the hard pipe section is provided with a branch pipe quick-cutting valve (9-4) and a visual flowmeter (9-5).
2. The red mud harmless treatment system based on the circulating fluidized bed boiler according to claim 1, wherein the red mud slurry dissolving tank (3) is connected with a dilution water inlet pipe (3-1), and a slurry tank heating device (3-2) and a slurry tank stirrer (3-3) are arranged in the red mud slurry dissolving tank (3).
3. The red mud harmless treatment system based on the circulating fluidized bed boiler according to claim 1, wherein the ammonia water transfer pump (6) is a variable frequency pump.
4. The red mud harmless treatment system based on the circulating fluidized bed boiler according to claim 1, wherein a slurry tank heating device (7-1) is further arranged in the reducing agent slurry tank (7), and the monitoring instruments (7-4) comprise a thermometer, a pressure gauge, a densimeter and a visual liquid level meter.
5. The red mud harmless treatment system based on the circulating fluidized bed boiler according to claim 1, wherein the reducing agent slurry conveying system (8) comprises a main path, a reducing agent slurry conveying pump (8-1) and a reducing agent slurry conveying pump outlet isolation valve (8-2) are arranged on the main path, and the reducing agent slurry conveying pump (8-1) is a variable frequency pump; the main path is respectively connected with a conveying branch and a back washing branch, the conveying branch is connected with a reducing agent slurry injection system (9), and a conveying branch isolating valve (8-3) is arranged on the conveying branch; the back washing branch comprises a back washing water inlet pipeline and a back washing sewage discharge pipeline, wherein a back washing water inlet pipeline isolation valve (8-4) is arranged on the back washing water inlet pipeline, and a back washing sewage discharge stop valve (8-5) is arranged on the back washing sewage discharge pipeline.
6. The red mud harmless treatment system based on the circulating fluidized bed boiler according to claim 1, wherein a liquid level interlock protection is arranged among the red mud slurry transfer pump (5), the ammonia water transfer pump (6) and the reducing agent slurry tank (7), and an emergency stop switch is arranged in the reducing agent slurry conveying system (8).
7. The working method of the red mud harmless treatment system based on the circulating fluidized bed boiler according to any one of claims 1 to 6, characterized by comprising the following steps:
after the red mud enters a red mud slurry dissolving tank (3), diluting and dissolving the red mud into red mud fine slurry, and after precipitation, insoluble slag enters a coal yard from a precipitation discharge port at the bottom to be mixed with raw coal and enters a coal bunker; the red mud fine slurry is conveyed to a reducing agent slurry tank (7) by a red mud slurry transfer pump (5) and is prepared with ammonia water; the ammonia water in the ammonia water storage tank (4) is conveyed to a reducing agent slurry tank (7) through an ammonia water transfer pump (6); the red mud fine slurry and the ammonia water which are introduced into the reducing agent slurry tank (7) are fully and uniformly mixed by a slurry tank stirrer (7-2) for blending, the concentration of the ammonia water is flexibly controlled according to the emission value of the nitrogen oxide of the circulating fluidized bed boiler, and if the emission concentration of the nitrogen oxide of the boiler is low for a long time, the concentration of the ammonia water is reduced; parameters of the reducing agent slurry in the reducing agent slurry tank (7) are monitored in real time through a monitoring instrument (7-4); the reducing agent slurry is conveyed to a reducing agent slurry injection system (9) through a reducing agent slurry conveying system (8) and then injected into a horizontal flue (10) of the circulating fluidized bed boiler.
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| CN112675692A (en) | 2021-04-20 |
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