CN201819575U - A system for power generation with metallurgical furnace waste heat steam - Google Patents

Abstract

The utility model discloses a system for generating electricity by using waste heat steam of metallurgical furnaces, which comprises various flue gas waste heat furnaces, saturated steam turbine generator sets, steam heat accumulators, high-pressure sub-cylinders, and low-pressure sub-cylinders for supplying heat to users. , the flue gas waste heat furnace communicates with the high-pressure sub-cylinder, the high-pressure sub-cylinder is connected to the low-pressure sub-cylinder through a pressure regulating valve and a flow regulating valve on the one hand, and connected to the steam turbine unit on the other hand, and the steam accumulator is connected Between the pressure regulating valve and the flow regulating valve, it is used to store heat during the peak steam production and supply heat to the low-pressure sub-cylinder during the low-peak steam production. Part of the steam that has done work is sent to the low-pressure sub-cylinder. The utility model improves the steam supply quality, not only can make the unit run stably, and the service life of the unit can be improved, but also provides the user with a steam heat source, so that the steam can be utilized by the energy ladder, and the heat recovery efficiency of waste heat is improved.

Description

A system for power generation with metallurgical furnace waste heat steam

technical field

The utility model relates to a steam power generation system, in particular to a system for generating power by using waste heat steam of a metallurgical furnace.

Background technique

Non-ferrous metal pyrometallurgical smelting process uses various types of metallurgical furnaces, such as Kiefset furnace, fluidized roasting furnace, blast furnace, reverberatory furnace, electric furnace, flash furnace, fuming furnace, etc. These metallurgical furnaces will produce a large amount of Generally, waste heat boilers are used to recover this part of smelting flue gas waste heat to produce medium-pressure saturated steam. At the same time, the heat load required by the pyrometallurgy industry is relatively small, and the output of medium-pressure saturated steam is much greater than the heat load demand, so large Some enterprises are equipped with saturated steam turbines for power generation. Since many non-ferrous smelting equipment work periodically, part of the saturated steam produced is continuous and part is intermittent, which makes the operation of the units unstable and reduces the thermal efficiency. The effective use of waste heat has brought negative effect. This has become a problem to be solved in the comprehensive utilization system of multi-quality waste heat steam power generation.

Utility model content

The purpose of the utility model is to provide a system for generating electricity by using waste heat steam of a metallurgical furnace, which can not only improve the heat recovery efficiency of waste heat, but also make the unit run smoothly.

The system for generating electricity with metallurgical furnace waste heat steam provided by the utility model includes each flue gas waste heat furnace, a saturated steam turbine generator set, and also includes a steam heat accumulator, a high-pressure sub-cylinder, and a low-pressure sub-cylinder for supplying heat to users. , the flue gas waste heat furnace communicates with the high-pressure sub-cylinder, the high-pressure sub-cylinder is connected to the low-pressure sub-cylinder through a pressure regulating valve and a flow regulating valve on the one hand, and connected to the steam turbine unit on the other hand, and the steam accumulator is connected Between the pressure regulating valve and the flow regulating valve, it is used to store heat during peak steam production and supply heat to the low-pressure sub-cylinder during low-peak steam production. Part of the steam that has done work is sent to the low-pressure sub-cylinder.

The utility model adds a steam accumulator, a high-pressure sub-cylinder, and a low-pressure sub-cylinder on the basis of the existing steam turbine unit power generation system, so that the system can control the steam intake and adjust the flow rate of the steam turbine unit during the peak steam production. Adjust the steam flow rate of the valve V2 to adapt to the fluctuation of the steam output of the waste heat boiler of the fuming furnace and the fluctuation of the heat load, so that a part of the steam is sent to the saturated turbogenerator to generate electricity, and part of the finished steam is drawn into the low-pressure sub-cylinder for the user The other part of the steam enters the steam accumulator for heat storage. When the steam production is low, in order to meet the minimum condensate demand of the steam turbine, all the steam enters the steam turbine unit to generate electricity, and adjust the opening and closing of the pressure regulating valve V1 and the steam flow of the V2 valve to adapt to the fluctuation of the steam production of the waste heat boiler of the fuming furnace , part of which is supplemented by the heat release of the steam accumulator, and part of which is supplied by steam extraction from the steam turbine to meet the user's steam load demand. Therefore, the utility model improves the quality of steam supply, not only can make the unit run stably, and the service life of the unit can be improved, but also provides the steam heat source to the user, so that the steam can be utilized by the energy ladder, and the heat recovery efficiency of waste heat is improved.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

As can be seen from Figure 1, the utility model still includes each flue gas waste heat furnace and steam turbine generator set, and also includes a steam accumulator 9, a high-pressure sub-cylinder 4, and a low-pressure sub-cylinder 5. In this embodiment, each flue gas waste heat The furnace includes Kiefset furnace shaft furnace waste heat boiler 1, Kiefset furnace electric zone furnace waste heat boiler 2, and fuming furnace waste heat furnace 3. Regulating valve V1 and flow regulating valve V2 are connected to low-pressure sub-cylinder 5, and on the other hand are connected to steam turbine generator set, which includes steam turbine 6, generator 7, and condenser 8. Steam drives the steam turbine generator set to generate electricity, and steam storage The heater 9 is connected between the pressure regulating valve V1 and the flow regulating valve V2, and is produced by continuous operation equipment (various types) such as the waste heat boiler 1 of the shaft furnace of the Kiefset furnace and the waste heat boiler 2 of the electric zone furnace of the Kiefset furnace. The steam and the intermittent steam produced by the waste heat boiler 3 of the fuming furnace enter the high-pressure sub-cylinder 4 respectively. During the peak steam production, the steam is adjusted by controlling the steam intake of the steam turbine unit and the flow regulating valve V2. The flow rate is adapted to the fluctuation of the steam production of the waste heat boiler of the fuming furnace and the fluctuation of the heat load, so that part of the steam enters the steam accumulator for heat storage, and the other part of the steam is sent to the saturated turbogenerator for power generation, and part of the steam that has completed work is drawn out Enter the low-pressure sub-cylinder 5, which is used to supply heat to users. The low-pressure sub-cylinder 5 should be incorporated into the plant pipe network to supply heat to users to meet the heat load demand, and the remaining steam continues to work for power generation. When the steam production is low, in order to meet the minimum steam condensation demand of the steam turbine, all the steam enters the steam turbine generating set to generate electricity, and the steam flow of the waste heat boiler of the fuming furnace is adapted to the steam production by opening and closing the pressure regulating valve V1 and controlling the steam flow of the flow regulating valve V2 Part of it is supplemented by the heat release of the steam accumulator, and part of it is supplied by the extraction steam of the steam turbine to meet the user's steam load demand. Stabilize the steam intake and steam heat load of the unit, improve the quality of steam supply, and increase the efficiency of heat recovery.

Claims (1)

1. system with metallurgical furnace afterheat steam generating, comprise each fume afterheat stove, saturated Turbo-generator Set, it is characterized in that also comprising steam accumulator (9), high pressure gas-distributing cylinder (4), be used for low pressure gas-distributing cylinder (5) to user's heat supply, described fume afterheat stove is communicated with high pressure gas-distributing cylinder (4), this high pressure gas-distributing cylinder is connected with described low pressure gas-distributing cylinder with flow control valve (V2) by pressure-regulating valve (V1) on the one hand, be connected with described Steam Turbine on the other hand, steam accumulator (9) is connected between pressure-regulating valve (V1) and the flow control valve (V2), be used for heat accumulation when steaming the peak, when steaming ebb to the heat supply of low pressure gas-distributing cylinder, Steam Turbine is connected with the low pressure gas-distributing cylinder, and the part steam that is used for will finishing merit when steaming the peak is transported to the low pressure gas-distributing cylinder.

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