CN219093109U

CN219093109U - Waste heat utilization system of industrial silicon submerged arc furnace integrating garbage plasma gasification

Info

Publication number: CN219093109U
Application number: CN202320202003.8U
Authority: CN
Inventors: 冯福媛; 陈衡; 赵淑媛; 潘佩媛; 徐钢; 刘彤
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-05-30
Anticipated expiration: 2033-02-14

Abstract

The utility model provides an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification. The system mainly comprises a plasma gasification and purification process, a solid oxide fuel cell power generation system, an industrial silicon production process, a waste heat recovery system and a steam cycle power generation unit. The system applies the gasification technology to the treatment of medical waste and dangerous waste, and simultaneously carries out waste heat recovery and utilization on the high-quality tail gas of the fuel cell, so that the steam parameters generated by the industrial silicon waste heat boiler are improved, the utilization rate of waste heat can be improved, the power generation capacity of the system is improved, and meanwhile, the high-efficiency cooperative utilization of environmental protection performance and solid waste recycling is realized.

Description

Waste heat utilization system of industrial silicon submerged arc furnace integrating garbage plasma gasification

Technical Field

The utility model belongs to an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification in the fields of solid waste resource utilization and multi-energy complementation.

Background

Industrial silicon is an important auxiliary material for industries such as steel, color, electronic information and the like, but is also a consumer of resources and energy. China is a large country for producing and consuming industrial silicon, the unit energy consumption of the industrial silicon production in China at present reaches more than 13000KW.h/t, and the advanced index in western countries reaches 11000KW.h/t, compared with the large energy consumption difference of most small and medium enterprises. This shows that the industrial silicon smelting in China has huge energy-saving potential. The consumption and the dependence of industrial silicon production on electric energy are great, the increase of the total industrial electricity consumption is promoted to a certain extent, and the situation of shortage of electric energy supply is aggravated. If the industrial silicon production line is matched with a waste heat power generation system, the energy consumption of the industrial silicon can be effectively reduced, and CO is reduced ₂ The greenhouse gas emission is equivalent, and the method has obvious environmental protection benefit.

The fuel cell is a device for directly converting chemical energy of fuel such as hydrogen energy into electric energy, and has the advantages of no noise, high efficiency, no pollution and the like. The solid oxide fuel cell is a medium-high temperature fuel cell, the operating temperature of the electric pile is about 600-1000 ℃, and the tail gas has high quality and can be reused.

The flue gas waste heat discharged in the production process of the industrial silicon ore furnace belongs to medium-temperature waste heat, the flow of the waste gas is low, the heat grade is low, the parameters (temperature and flow) of the flue gas waste heat have certain fluctuation, the fluctuation range is large, the flue gas can generate steam with certain temperature and pressure after being recovered by a waste heat boiler, but the steam parameters are low and are generally not higher than 400 ℃; the tail gas generated by the fuel cell has high quality, so that the tail gas with high quality of approximately 1000 ℃ can be used for improving the steam parameters of the silicon waste heat boiler to fully utilize the waste heat of the flue gas, and the tail gas after heat recovery of the steam generator enters the waste heat boiler to further recover heat, so that the waste heat utilization efficiency is improved.

According to the industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification, disclosed by the utility model, the gasification technology is applied to treatment of medical garbage and hazardous waste, and meanwhile, the high-quality tail gas of a fuel cell is subjected to waste heat recycling, so that the steam parameters generated by an industrial silicon waste heat boiler are improved, the waste heat utilization rate can be improved, the power generation capacity of the system is improved, and meanwhile, the environment-friendly performance and the high-efficiency cooperation of solid waste recycling are realized.

Disclosure of Invention

The utility model provides an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification, which is characterized in that: the method comprises a plasma gasification and purification process, a solid oxide fuel cell power generation system, an industrial silicon production process, a waste heat recovery system and a steam cycle power generation unit; the plasma gasification and purification process comprises a plasma gasification furnace, a synthesis gas cooler and a desulfurization device; the solid oxide fuel cell power generation system comprises a pile, an inverter, a No. 1 generator and a combustor; the production process of the industrial silicon comprises an industrial furnace; the waste heat recovery system comprises a waste heat boiler and a steam generator; the steam cycle generator set comprises a steam turbine, a No. 2 generator, a condenser, a condensate pump, a low-pressure heater, a deaerator, a water supply pump and a high-pressure heater; the outlet of the plasma gasification furnace is connected with the inlet of the synthesis gas cooler, the outlet of the synthesis gas cooler is connected with the inlet of the desulfurization device, the outlet of the desulfurization device is connected with the anode inlet of the electric pile, the outlet of the electric pile is sequentially connected with the inverter and the No. 1 generator, and the cathode and anode outlets of the electric pile are connected with the inlet of the burner; the outlet of the burner is sequentially connected with a steam generator and a waste heat boiler; the industrial furnace outlet is connected to the waste heat boiler inlet, the waste heat boiler outlet is connected with the steam generator inlet, the steam generator outlet is connected with the steam turbine inlet, the steam turbine is coaxially connected with the No. 2 generator, and the steam turbine outlet is respectively connected to the condenser, the low-pressure heater, the deaerator and the high-pressure heater; the condenser, the condensate pump, the low-pressure heater, the deaerator, the water supply pump and the high-pressure heater are sequentially connected, and an outlet of the high-pressure heater is connected with an inlet of the waste heat boiler.

The plasma gasification furnace is used for treating medical waste and hazardous waste, and the synthesis gas from the desulfurization device enters the pile anode and is used as fuel to participate in electrochemical reaction.

And the unreacted gas of the anode of the electric pile and the residual oxidant of the cathode are introduced into a burner for combustion, and the flue gas at the outlet of the burner is recycled in a steam generator.

And after the flue gas is recycled by the steam generator, the flue gas and the flue gas generated by the industrial furnace enter a waste heat boiler together to recycle the waste heat.

The beneficial effects of the utility model are as follows:

the utility model provides an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification. The gasification technology is applied to treatment of medical waste and hazardous waste, synthesis gas generated by gasification enters a fuel cell, high-quality tail gas generated by the fuel cell is used for reheating steam which is generated by a silicon waste heat boiler and is at about 400 ℃ in a steam generator so as to improve steam parameters, and flue gas which is utilized by the steam generator enters a waste heat boiler together with flue gas generated by a silicon industrial furnace for heat recovery and then enters a flue gas purification device. Therefore, the utilization rate of the waste heat can be improved, the power generation capacity of the system is improved, and the environment-friendly performance and the high-efficiency cooperative utilization of solid waste resources are realized.

Drawings

Fig. 1 is a schematic diagram of an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification.

In the figure: 1-a plasma gasifier; 2-syngas cooler; 3-desulfurizing device; 4-pile; a 5-inverter; a 6-1# generator; 7-a burner; 8-an industrial furnace; 9-a waste heat boiler; 10-a steam generator; 11-a steam turbine; a 12-2# generator; 13-a condenser; 14-a condensate pump; 15-a low pressure heater; a 16-deaerator; 17-a water feed pump; 18-high pressure heater.

Detailed Description

The utility model provides an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification, and the utility model is further described below with reference to the accompanying drawings and the specific embodiments.

Fig. 1 shows an industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification.

As shown in fig. 1, the waste heat utilization system of the industrial silicon submerged arc furnace integrating garbage plasma gasification comprises a plasma gasification and purification process, a solid oxide fuel cell power generation system, an industrial silicon production process, a waste heat recovery system and a steam cycle generator set.

The main flow of the material and working medium in the plasma gasification and purification part is as follows: hazardous waste generated by medical waste and industrial furnaces and gasifying agents enter a plasma gasifier 1, the hazardous waste and gasifying agents contact a high-temperature plasma arc (the temperature ranges from 1500 ℃ to 5500 ℃), organic components are converted into high-quality synthetic gas and inorganic/residual fractions are converted into stable vitrified slag in the plasma gasifier 1, the slag is discharged from the bottom of the gasifier, and the high-quality synthetic gas enters a synthetic gas cooler 2 to be cooled and compressed to a certain temperature and a certain pressure; only clean synthesis gas can enter the stack 4 as anode fuel and react electrochemically with air entering the cathode, so that the synthesis gas exiting the synthesis gas cooler 2 is further passed through the desulphurisation unit 3 to remove elemental sulphur from the synthesis gas.

The main flow of the working medium of the solid oxide fuel cell power generation system is as follows: the synthesis gas generated by gasification of the plasma gasification furnace 1 enters the anode of the electric pile 4 after being cooled and purified, air is introduced into the cathode of the electric pile 4, cathode and anode gases are subjected to electrochemical reaction in the electric pile 4, the heat generated by the electrochemical reaction heats the cathode gases which are not completely reacted when the battery generates electric energy, and the gas which is not completely reacted at the anode and the residual oxidant at the cathode are introduced into the combustor 7 for combustion.

The main flow of the working medium in the production process of the industrial silicon is that raw materials react in an industrial furnace 8 to generate industrial silicon and hazardous waste, the generated hazardous waste can be sent into a plasma gasification furnace 1 to generate synthesis gas, and flue gas generated by the industrial furnace 8 enters a waste heat boiler 9 for heat recovery and utilization.

The main flow of the working medium of the waste heat recovery system is as follows: superheated steam from the waste heat boiler 9 enters a steam generator 10, and in the steam generator 10, steam parameters are further improved to improve the power generation capacity of the system.

The main flow of the working medium of the steam cycle generator set is as follows: the steam from the steam generator 10 enters a steam turbine 11 to expand and do work to drive a No. 2 generator 12 to generate power, the temperature and pressure of the steam after doing work are reduced, and the exhaust steam enters a condenser 13 to release heat; in the steam expansion working process, partial steam is extracted from a proper position of a steam turbine and is used as a heat source of a high-pressure heater 18 and a low-pressure heater 15 in a regenerative system of a steam turbine generator set; condensed water after heat release by the condenser 13 is pumped into the low-pressure heater 15 through the condensate pump 14, working medium at the outlet of the low-pressure heater 15 flows through the deaerator 16, the water feeding pump 17 and the high-pressure heater 18 enter the waste heat boiler 9 for recycling, and in the process of circulating the condensed water, the high-pressure heater 18 and the low-pressure heater 15 are subjected to water repellent gradual self-flow and respectively collected into the deaerator 16 and the water tank of the condenser 13.

The above embodiments are only for illustrating the present utility model, wherein the structure and connection manner of each component may be changed, and all equivalent changes and modifications based on the technical solution of the present utility model are within the protection scope of the present patent.

Claims

1. An industrial silicon submerged arc furnace waste heat utilization system integrating garbage plasma gasification is characterized in that: the method comprises a plasma gasification and purification process, a solid oxide fuel cell power generation system, an industrial silicon production process, a waste heat recovery system and a steam cycle power generation unit; the plasma gasification and purification process comprises a plasma gasification furnace (1), a synthesis gas cooler (2) and a desulfurization device (3); the solid oxide fuel cell power generation system comprises a pile (4), an inverter (5), a No. 1 generator (6) and a combustor (7); the production process of the industrial silicon comprises an industrial furnace (8); the waste heat recovery system comprises a waste heat boiler (9) and a steam generator (10); the steam cycle generator set comprises a steam turbine (11), a No. 2 generator (12), a condenser (13), a condensate pump (14), a low-pressure heater (15), a deaerator (16), a water supply pump (17) and a high-pressure heater (18); the outlet of the plasma gasification furnace (1) is connected with the inlet of the synthesis gas cooler (2), the outlet of the synthesis gas cooler (2) is connected with the inlet of the desulfurization device (3), the outlet of the desulfurization device (3) is connected with the anode inlet of the electric pile (4), the outlet of the electric pile (4) is sequentially connected with the inverter (5) and the 1# generator (6), and the outlet of the cathode and anode of the electric pile (4) is connected with the inlet of the combustor (7); the outlet of the burner (7) is sequentially connected with a steam generator (10) and a waste heat boiler (9); the outlet of the industrial furnace (8) is connected to the inlet of the waste heat boiler (9), the outlet of the waste heat boiler (9) is connected with the inlet of the steam generator (10), the outlet of the steam generator (10) is connected with the inlet of the steam turbine (11), the steam turbine (11) is coaxially connected with the No. 2 generator (12), and the outlets of the steam turbine (11) are respectively connected to the condenser (13), the low-pressure heater (15), the deaerator (16) and the high-pressure heater (18); the condenser (13), the condensate pump (14), the low-pressure heater (15), the deaerator (16), the water supply pump (17) and the high-pressure heater (18) are sequentially connected, and an outlet of the high-pressure heater (18) is connected with an inlet of the waste heat boiler (9).

2. The waste heat utilization system of an industrial silicon submerged arc furnace for integrated waste plasma gasification as defined in claim 1, wherein: the plasma gasification furnace (1) is used for treating medical waste and hazardous waste, and the synthesis gas from the desulfurization device (3) enters the anode of the electric pile (4) and is used as fuel to participate in electrochemical reaction.

3. The waste heat utilization system of an industrial silicon submerged arc furnace for integrated waste plasma gasification as defined in claim 1, wherein: the gas which is not reacted completely at the anode of the electric pile (4) and the residual oxidant at the cathode are led into a burner (7) for burning, and the flue gas at the outlet of the burner (7) is recycled in a steam generator (10).

4. The waste heat utilization system of an industrial silicon submerged arc furnace for integrated waste plasma gasification as defined in claim 1, wherein: after the flue gas is recycled by the steam generator (10), the flue gas and the flue gas generated by the industrial furnace (8) enter the waste heat boiler (9) together, and the waste heat is recycled.