CN210486528U - Industrial silicon flue gas purification system - Google Patents

Industrial silicon flue gas purification system Download PDF

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Publication number
CN210486528U
CN210486528U CN201921191715.4U CN201921191715U CN210486528U CN 210486528 U CN210486528 U CN 210486528U CN 201921191715 U CN201921191715 U CN 201921191715U CN 210486528 U CN210486528 U CN 210486528U
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flue gas
waste heat
heat boiler
industrial silicon
superheater
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冯学明
吴周友
谢岩
胡永吉
何瑞
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Xinjiang Xixixin New Energy Material Technology Co ltd
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Xinjiang Xixixin New Energy Material Technology Co ltd
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    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The utility model discloses an industrial silicon flue gas purification system, which comprises a high-temperature dust remover used for connecting a flue gas outlet of a submerged arc furnace, and a waste heat boiler, a main fan and a desulfurizing tower which are connected in sequence; the waste heat boiler comprises a superheater, an evaporator and an economizer which are connected in sequence; the air inlet of the superheater is connected with the air outlet of the high-temperature dust remover; be equipped with flue gas denitrification facility between over heater and the evaporimeter, flue gas denitrification facility passes through the pipe connection respectively between over heater and evaporimeter. The industrial silicon high-temperature flue gas is dedusted by a high-temperature deduster and then subjected to waste heat recovery power generation, denitration and desulfurization. Make exhaust-heat boiler and denitration work in low dust environment, improve exhaust-heat boiler heat exchange efficiency and operation cycle, solved the low and difficult problem of denitration catalyst dust jam of denitration temperature.

Description

Industrial silicon flue gas purification system
Technical Field
The utility model belongs to industrial silicon production field specifically is a flue gas purification system of production industrial silicon.
Background
From 2012 to 2018, domestic industrial silicon has an increasing trend of effective production capacity, actual yield and domestic consumption. The nominal capacity of the domestic industrial silicon production submerged arc furnace is four furnace types of 6.3MVA, 12.5MVA, 16.5MVA and 33 MVA; the newly-built industrial silicon device mainly adopts a furnace type with nominal capacity of 33 MVA; the large furnace type accounts for 13.9% in 2012, and is promoted to 36% in 2018. In 2018, the industrial silicon yield of Xinjiang, Yunnan and Sichuan provinces accounts for 70.6 percent, and the yield accounts for 76.7 percent.
At present, the flue gas purification of the industrial silicon production submerged arc furnace in China has the following processes:
(1) air cooling, bag dust removal process (see fig. 1):
in the industrial silicon device built before 2016, the national government and the local government do not require flue gas purification to build an environment-friendly desulfurization and denitrification device. The process for purifying the flue gas of the submerged arc furnace comprises the following steps: industrial silicon ore furnace → air cooler → main suction fan → main bag-type dust collector → discharge. However, the flue gas purification process has the following problems: the flue gas is cooled by an air cooler, and the heat of the flue gas is not recycled; the flue gas is not subjected to desulfurization and denitrification and is collected with NOx、SO2And discharging environmental protection taxes.
(2) Waste heat recovery and bag dust removal process (see fig. 2):
in the industrial silicon production process, a large amount of high-temperature flue gas is generated, and a part of industrial silicon manufacturers use waste heat boilers to replace air coolers to recover heat in the flue gas, so that steam is generated, a steam turbine is pushed to do work, and a generator is driven to generate electricity. The process for purifying the flue gas of the submerged arc furnace comprises the following steps: industrial silicon ore heating furnace → waste heat boiler → main suction fan → main bag-type dust collector → discharge. The waste heat boiler replaces an air cooler to generate steam to drive a steam turbine to do work and drive a generatorPower generation, has the following problems: the ash removal of the industrial silicon flue gas waste heat boiler is realized by a steam ash blower, a sound wave ash blower, a shock wave ash blower, a mechanical brush ash removal, continuous steel ball ash removal and other forms, and the problem of ash removal of a fire tube of the waste heat boiler cannot be effectively solved due to strong adhesion of micro silicon powder; the flue gas is not desulfurized and denitrified and NO is collectedx、SO2And discharging environmental protection taxes.
(3) Waste heat recovery, bag dust removal and desulfurization processes (see fig. 3):
after 2016, the local government in Yunnan requires industrial silicon production enterprises to construct equipment for environment-friendly flue gas desulfurization and the like; in 2018, the silicon industry association in 7 months investigates 19 industrial silicon enterprises in Yunnan, and only one enterprise which has built and operated the desulfurization equipment has the silicon industry in Yongchang. The process for purifying the flue gas of the mine heating furnace in the Nannan Yongchang silicon industry comprises the following steps: industrial silicon ore heating furnace → waste heat boiler → main bag dust collector → main suction fan → wet flue gas desulfurization → centralized discharge. Flue gas is desulfurized after waste heat recovery and cloth bag dust removal, and has the following problems: the ash of the fire tube of the waste heat boiler is removed; the flue gas was not denitrated.
(4) Waste heat recovery, bag dust removal, denitration and desulfurization processes (see fig. 4):
after 2016, the local government of Xinjiang requires industrial silicon production enterprises to construct environment-friendly desulfurization and denitration equipment, and in 2018, the eastern hopes to carry out desulfurization and denitration transformation on the Xinjiang industrial silicon project which is already put into production. The flue gas purification process of the ore-smelting furnace hoped by the east of Xinjiang comprises the following steps: industrial silicon ore heating furnace → waste heat boiler → main bag-type dust collector main suction fan → flue gas SCR denitration → flue gas wet desulphurization → centralized discharge. Flue gas carries out denitration, desulfurization after waste heat recovery, sack remove dust, has following problem: the ash of the fire tube of the waste heat boiler is removed; the denitration temperature is low, the catalyst loading is large, the low-temperature catalyst with the activity temperature below 200 ℃ is not mature, and the denitration effect is not well guaranteed.
(5) Denitration, waste heat recovery, cloth bag dust removal and desulfurization processes (see figure 5):
newly-built industrial silicon project of shanshan of honourable province in Xinjiang in 2018 adopts single stove high temperature denitration, and four stove flue gases are desulfurization together, and hot stove flue gas purification flow in ore deposit is: industrial silicon ore heating furnace → flue gas denitration → exhaust-heat boiler → main bag dust collector → main suction fan → flue gas wet desulphurization → centralized discharge. Flue gas carries out the desulfurization after denitration, waste heat recovery, sack remove dust, has following problem: the problem that the pore of the denitration catalyst is blocked by the silica fume is solved; the problem of ash removal of a fire tube of the waste heat boiler.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide a flue gas purification system of production industry silicon of transformation, solve puzzlement exhaust-heat boiler deashing, denitration temperature low and denitration catalyst dust jam's a difficult problem.
In order to solve the technical problem, the utility model discloses an industrial silicon flue gas purification system, which comprises a high-temperature dust remover used for connecting a flue gas outlet of a submerged arc furnace, and a waste heat boiler, a main fan and a desulfurizing tower which are connected in sequence;
the waste heat boiler comprises a superheater, an evaporator and an economizer which are connected in sequence; the air inlet of the superheater is connected with the air outlet of the high-temperature dust remover; be equipped with flue gas denitrification facility between over heater and the evaporimeter, flue gas denitrification facility passes through the pipe connection respectively between over heater and evaporimeter.
The industrial silicon high-temperature flue gas is dedusted by a high-temperature deduster and then subjected to waste heat recovery power generation, denitration and desulfurization. Make exhaust-heat boiler and denitration work in low dust environment, improve exhaust-heat boiler heat exchange efficiency and operation cycle, solved the low and difficult problem of denitration catalyst dust jam of denitration temperature.
Specifically, the waste heat boiler further comprises a steam turbine, a generator, a condenser and a boiler barrel; the superheater is connected with a steam turbine through a steam pipe, and the steam turbine is respectively connected with the generator and the condenser; the condenser is connected with the economizer through a water pipe, and the economizer is connected with the drum through a water pipe; the evaporator is connected with the boiler barrel through a circulating pipeline; the drum is connected with the superheater through a pipeline.
Furthermore, a heat recovery device and a water melting system are arranged on a pipeline between the condenser and the economizer, a condensate pump is arranged on a pipeline between the heat recovery device and the condenser, and a water feed pump is arranged on a pipeline between the heat recovery device and the economizer.
Preferably, the high-temperature dust collector is internally provided with a flexible metal film filter bag which is purchased from Sichuan Chengdu Yitai science and technology limited company, and the flexible metal film filter bag is used for replacing a common glass fiber filter bag and is used for removing dust from smoke in a high-temperature environment.
Has the advantages that:
the industrial silicon flue gas purification system adopts the processes of high-temperature dust removal, waste heat recovery, denitration and desulfurization purification, so that the waste heat boiler and the denitration catalyst are in a clean working environment, the problem of ash removal of a fire tube of the waste heat boiler is solved, and the heat exchange efficiency and the operation period of the waste heat boiler are improved; the problem of silica fume to denitration catalyst jam is solved, the denitration effect is guaranteed, catalyst life is prolonged, under the prerequisite of guaranteeing dust removal, waste heat recovery, denitration, desulfurization effect, the investment is minimum.
Drawings
These and/or other advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings and the following detailed description.
FIG. 1 is a prior art air cooling, bag house dust removal flow diagram;
FIG. 2 is a flow chart of waste heat recovery and bag-type dust removal in the prior art;
FIG. 3 is a flow chart of waste heat recovery, bag-type dust removal and desulfurization in the prior art;
FIG. 4 is a flow chart of waste heat recovery, cloth bag dust removal, denitration and desulfurization in the prior art;
FIG. 5 is a flow chart of denitration, waste heat recovery, bag-type dust removal and desulfurization in the prior art;
fig. 6 is a schematic diagram of the overall structure of the industrial silicon flue gas purification system.
Wherein each reference numeral represents: 1, a high-temperature dust remover; 2, a waste heat boiler; 21 a superheater; 22 an evaporator; 23, a coal economizer; 24 a steam turbine; 25, a generator; 26 a condenser; 27 drum; 28, a heat recovery device; a 29 chemical water system; 30 a condensate pump; 31 a water pump; 3, a main fan; 4, a desulfurizing tower; 5, a flue gas denitration device; 10 a submerged arc furnace; no. 20 ore furnace.
Detailed Description
The invention will be better understood from the following examples.
The drawings in the specification show the structure, ratio, size, etc. only for the purpose of matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and not for the purpose of limiting the present invention, so the present invention does not have the essential meaning in the art, and any structure modification, ratio relationship change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and achievable purpose of the present invention. Meanwhile, the terms "upper", "lower", "front", "rear", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
As shown in fig. 6, the industrial silicon flue gas purification system comprises a high-temperature dust remover 1 for connecting a flue gas outlet of a submerged arc furnace, and a waste heat boiler 2, a main fan 3 and a desulfurizing tower 4 which are connected in sequence; the waste heat boiler 2 comprises a superheater 21, an evaporator 22 and an economizer 23 which are connected in sequence; the air inlet of the superheater 22 is connected with the air outlet of the high-temperature dust remover 1; be equipped with flue gas denitrification facility 5 between over heater 21 and the evaporimeter 22, flue gas denitrification facility 5 passes through the pipe connection respectively between over heater 21 and evaporimeter 22.
The smoke exhaust pipelines of the smoke hoods of the first submerged arc furnace 10 and the second submerged arc furnace 20 are respectively connected with a collecting smoke pipe, high-temperature dust-containing smoke exhausted from the submerged arc furnace at about 600 ℃ enters a high-temperature dust collector 1 through a smoke collecting pipe for high-temperature filtration and purification, the filtered micro silicon powder is collected and sold outside, the filtered clean high-temperature smoke enters a superheater 21 of a waste heat boiler 2, a smoke denitration device 5 is arranged between the two groups of heat exchange modules of the waste heat boiler superheater 21 and an evaporator 22, the smoke exhausted from the waste heat boiler superheater at about 350 ℃ enters the smoke denitration device 5, the denitrated smoke sequentially enters the waste heat boiler evaporator 22 and an economizer 23, the high-temperature smoke is dedusted by a filter bag of the high-temperature dust collector 1 and exchanges heat with the waste heat boiler, the temperature of the flue gas is reduced from 600 ℃ to 180 ℃, the flue gas after dust removal and heat recovery is pumped into a desulfurizing device 4 by a main fan 3 and discharged to the atmosphere after desulfurization.
The waste heat boiler 2 further comprises a steam turbine 24, a generator 25, a condenser 26 and a drum 27; the superheater 21 is connected with a steam turbine 24 through a steam pipe, and the steam turbine 24 is respectively connected with a generator 25 and a condenser 26; the condenser 25 is connected with the economizer 23 through a water pipe, and the economizer 23 is connected with the drum 27 through a water pipe; the evaporator 22 is connected with the drum 27 through a circulating pipeline; the drum 27 is connected to the superheater 21 by a pipe. A heat recovery device 28 and a water chemical system 29 are arranged on a pipeline between the condenser 25 and the economizer 23, a condensate pump 30 is arranged on a pipeline between the heat recovery device 28 and the condenser 25, and a water feed pump 31 is arranged on a pipeline between the heat recovery device 28 and the economizer 23.
Superheated steam generated by the waste heat boiler superheater 21 pushes a steam turbine 24 to do work to drive a generator 25 to generate power, backpressure steam after power generation is cooled by a condenser 26, soft water is supplemented to a water melting system 29 and then returns to the waste heat boiler economizer 23 through a water feeding pump 31 to be recycled, steam generated by the economizer 23 and the evaporator 22 enters the waste heat boiler drum 27 to be subjected to steam-water separation, the separated steam-water returns to the evaporator 22, and saturated steam generated by the drum 27 is sent to the waste heat boiler superheater 21 to be heated to the superheated steam. The waste heat boiler is composed of three groups of heat exchange modules including a superheater, an evaporator and an economizer, the superheater is separated from the other two groups of modules, a flue gas denitration device is arranged between the superheater and the other two groups of modules, the superheater and the flue gas denitration device are connected with the evaporator through pipelines.
The high-temperature dust collector 1 is internally provided with a flexible metal film filter bag which is purchased from Sichuan Chengdu Yitai science and technology limited company, and the flexible metal film filter bag is used for replacing a common glass fiber filter bag and removing dust from smoke in a high-temperature environment. The occupied area, volume and weight of the dust collector are about half of those of a common filter bag, and the installation mode of the dust collector is the same as that of the common filter bag.
In industrial siliconIn the smelting process, the fume discharged from the electric furnace carries dust (micro silicon powder), and the dust concentration is generally not more than 5g/m3. The micro silicon powder is characterized by small particle size, large specific surface area, strong adhesiveness, high thermal resistance and specific resistance. The phase of the micro silicon powder is mostly amorphous SiO2Containing only a small amount of SiO2A crystalline material; more than 80% of the particles have a diameter less than 1 um.
Due to the high specific resistance characteristic of the micro silicon powder, the high-temperature metal filter bag dust remover is arranged at the front end of the waste heat boiler of the industrial silicon electric furnace, dust removal is carried out firstly, then denitration is carried out, and the denitration device and the waste heat boiler work in a low-dust environment, so that the catalyst and the waste heat boiler are ensured to be in a clean working environment, the service life of the catalyst is prolonged, the problem of troubling the dust removal of the waste heat boiler is solved, and the long-period stable operation of the electric furnace is ensured.
The industrial silicon flue gas purification system is used for purifying high-temperature flue gas in the industrial silicon production process, the temperature and the pressure of an inlet and an outlet of each working section are monitored, and the results are shown in table 1, so that the system is prompted to be stable in working state.
TABLE 1
Flue gas at furnace mouth High-temperature filter bag Residual boiler superheater Denitration device Evaporator for waste boiler Coal economizer for waste boiler Main fan Desulfurizing device
Inlet temperature C 600~700 600~700 570~670 300~400 270~350 ~180 180~200
Outlet temperature C 600~700 570~670 300~400 270~350 ~180 ~180 Wet or dry processes
Inlet pressure pa -1000 -1000 -1010 -1500 -2500 -3000 -3500 2000
Outlet pressure pa -1000 -1010 -1500 -2500 -3000 -3500 2000 1000
The utility model provides a thought and method of industrial silicon flue gas purification system specifically realize this technical scheme's method and approach many, above only the utility model discloses a preferred embodiment should point out, to the ordinary skilled person in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also be regarded as with moist decorations the utility model discloses a protection scope. All the components not specified in the present embodiment can be realized by the prior art.

Claims (4)

1. The industrial silicon flue gas purification system is characterized by comprising a high-temperature dust remover (1) used for being connected with a flue gas outlet of a submerged arc furnace, and a waste heat boiler (2), a main fan (3) and a desulfurizing tower (4) which are sequentially connected;
the waste heat boiler (2) comprises a superheater (21), an evaporator (22) and an economizer (23) which are connected in sequence; the air inlet of the superheater (21) is connected with the air outlet of the high-temperature dust remover (1); be equipped with flue gas denitrification facility (5) between over heater (21) and evaporimeter (22), flue gas denitrification facility (5) are respectively through the pipe connection between over heater (21) and evaporimeter (22).
2. The industrial silicon flue gas purification system according to claim 1, wherein the waste heat boiler (2) further comprises a steam turbine (24), a generator (25), a condenser (26) and a drum (27);
the superheater (21) is connected with a steam turbine (24) through a steam pipe, and the steam turbine (24) is respectively connected with a generator (25) and a condenser (26); the condenser (26) is connected with the economizer (23) through a water pipe, and the economizer (23) is connected with the drum (27) through a water pipe; the evaporator (22) is connected with the drum (27) through a circulating pipeline; the drum (27) is connected with the superheater (21) through a pipeline.
3. The industrial silicon flue gas purification system according to claim 2, wherein a heat recovery device (28) and a water chemical system (29) are arranged on a pipeline between the condenser (26) and the economizer (23), a condensate pump (30) is arranged on a pipeline between the heat recovery device (28) and the condenser (26), and a water feed pump (31) is arranged on a pipeline between the heat recovery device (28) and the economizer (23).
4. The industrial silicon flue gas purification system according to claim 1, wherein the high temperature dust collector (1) is provided with a flexible metal film filter bag, which is purchased from Sichuan Chengdu Yitai technologies, Inc.
CN201921191715.4U 2019-07-26 2019-07-26 Industrial silicon flue gas purification system Active CN210486528U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114887409A (en) * 2022-04-26 2022-08-12 成都易态科技有限公司 Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas
CN115055039A (en) * 2022-06-16 2022-09-16 中冶东方工程技术有限公司 Industrial silicon electric furnace flue gas purification system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114887409A (en) * 2022-04-26 2022-08-12 成都易态科技有限公司 Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas
CN115055039A (en) * 2022-06-16 2022-09-16 中冶东方工程技术有限公司 Industrial silicon electric furnace flue gas purification system and method

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