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CN-224230735-U - Waste heat power generation system of steelmaking sintering circular cooler

CN224230735UCN 224230735 UCN224230735 UCN 224230735UCN-224230735-U

Abstract

The utility model discloses a steelmaking sintering circular cooler waste heat power generation system which comprises a circular cooler, a steam turbine, a generator, a primary coal economizer, a secondary coal economizer, an evaporator, a steam drum, a primary superheater, a secondary superheater, a phase change energy storage system and a control system, wherein the phase change energy storage system comprises a heat storage tank, a heat release storage tank, a first temperature sensor, a second temperature sensor, a smoke three-way valve and a steam three-way valve, the first temperature sensor is arranged on the heat storage tank, the second temperature sensor is arranged on the heat release storage tank, and the smoke three-way valve, the steam three-way valve, the first temperature sensor and the second temperature sensor are electrically connected with the control system.

Inventors

  • LI PING
  • ZHOU XINYONG

Assignees

  • 广东新开能节能工程有限公司
  • 阳江广润节能科技有限公司
  • 玉林广润余热发电有限公司
  • 广东新开能环境科技有限公司
  • 宁德开能环保能源有限公司

Dates

Publication Date
20260512
Application Date
20250421

Claims (6)

  1. 1. The waste heat power generation system of the steelmaking sintering circular cooler comprises a circular cooler, a turbine, a generator, a first-stage economizer, a second-stage economizer, an evaporator, a steam drum, a first-stage superheater and a second-stage superheater, wherein the circular cooler is provided with a low-temperature flue gas end, a medium-temperature flue gas end and a high-temperature flue gas end, the output end of the turbine is connected with the input end of the generator, the low-temperature flue gas end is connected with the second-stage economizer, the output end of the medium-temperature flue gas end is connected with the input end of the evaporator, the output end of the evaporator is connected with the first-stage economizer, and the output end of the first-stage economizer is connected with the other output end of the second-stage economizer; The steelmaking sintering circular cooler waste heat power generation system is characterized by further comprising a phase change energy storage system and a control system; the phase change energy storage system comprises a heat storage tank, a heat release tank, a first temperature sensor, a second temperature sensor, a smoke three-way valve and a steam three-way valve; The smoke three-way valve is used for controlling the smoke flow direction of the outlet of the secondary economizer, and the steam three-way valve is used for controlling the heat supply path of the heat release storage tank; The smoke three-way valve is provided with a first smoke input port, a first smoke output port and a second smoke output port, and the first smoke input port is connected with the other output end of the secondary economizer; the steam three-way valve is provided with a first steam input port, a second steam input port and a steam output port, wherein the first steam input port is connected with a steam outlet of the heat storage tank, the second steam input port is connected with a steam outlet of the heat release tank; The first temperature sensor is arranged on the heat storage tank, the second temperature sensor is arranged on the heat release storage tank, and the smoke three-way valve, the steam three-way valve, the first temperature sensor and the second temperature sensor are electrically connected with the control system.
  2. 2. The steelmaking sintering circular cooler waste heat power generation system according to claim 1, wherein the control system controls the smoke three-way valve to guide smoke of the secondary economizer to the heat storage tank when the temperature of the heat storage tank is lower than a set value, and controls the steam three-way valve to output steam to the steam drum when the temperature of the heat release tank is higher than the set value.
  3. 3. The waste heat power generation system of the steelmaking sintering circular cooler is characterized in that a high-temperature resistant dust remover is further arranged between the circular cooler and a low-temperature flue gas end, between the circular cooler and a middle-temperature flue gas end and between the circular cooler and a high-temperature flue gas end, the high-temperature resistant dust remover is provided with a low-temperature purification output end, a middle-temperature purification output end and a high-temperature purification output end, the low-temperature purification output end is connected with an input end of the low-temperature flue gas end, the middle-temperature purification output end is connected with an input end of the middle-temperature flue gas end, and the high-temperature purification output end is connected with an input end of the high-temperature flue gas end.
  4. 4. The steelmaking sintering circular cooler waste heat power generation system according to claim 1 is characterized in that the smoke three-way valve is an electric smoke three-way valve, and the steam three-way valve is an electric steam three-way valve.
  5. 5. The steelmaking sintering circular cooler waste heat power generation system according to claim 1, wherein high-temperature molten salt is arranged in the heat storage tank.
  6. 6. The steelmaking sintering circular cooler waste heat power generation system as set forth in claim 1, wherein said heat release storage tank is internally provided with medium temperature molten salt.

Description

Waste heat power generation system of steelmaking sintering circular cooler Technical Field The utility model relates to the technical field of waste heat power generation systems, in particular to a waste heat power generation system of a steelmaking sintering circular cooler. Background In the steel production process, a large amount of high-temperature flue gas is generated in the sintering process, the waste heat carried by the flue gas has higher recovery value, the high-temperature flue gas waste heat generated in steelmaking belongs to high-grade heat energy resources, and a waste heat boiler is widely used for recycling the high-temperature flue gas at present. Conventional steelmaking sintering circular cooler waste heat power generation systems generally comprise a circular cooler, a steam turbine, a generator and multi-stage heat exchange equipment (such as an economizer, an evaporator, a superheater and the like). Specifically, the high-temperature, medium-temperature and low-temperature flue gas ends of the annular cooler are respectively connected to different heat exchange devices, and steam is generated through heat exchange to drive a steam turbine to generate electricity. In recent years, a technical scheme of heat storage by adopting a Phase Change Material (PCM) has appeared, for example, a waste heat recovery system based on fused salt heat storage is only designed by adopting a single tank, when high-temperature flue gas is generated by a sintering machine (heat storage requirement), the low valley period of power generation load (low heat release requirement) tends to be positive, and when the power generation is in a peak (high steam requirement), the waste heat of the flue gas is insufficient, the synchronous progress of heat storage and heat release cannot be realized by adopting the single tank design, so that the temperature of the fused salt in the tank in the heat storage stage is raised to more than 250 ℃, but the surplus heat cannot be utilized immediately, and the waste heat can only be emptied through a chimney (the energy waste rate is up to 35%), and after the heat in the tank in the heat release stage is rapidly exhausted, the afterburning system is forced to be started (the fuel cost is increased by 40%). Therefore, a new technical solution is needed to solve the above problems. Disclosure of utility model In view of the above, the main object of the present utility model is to provide a waste heat power generation system of a steelmaking sintering circular cooler, which is designed by a phase change energy storage system, so that when the waste heat is sufficient, the surplus heat can be stored in a heat storage tank and a heat release storage tank, the waste of the heat is avoided, the stored heat is released when the waste heat is insufficient, the full and flexible utilization of the waste heat of the circular cooler is realized, the waste heat recovery efficiency is improved, and the waste heat recovery system is connected with a steam drum, so that the heat can be timely supplemented according to the steam demand, the pressure and the temperature of the steam in the steam drum are stabilized, the steam parameters of the inlet of a steam turbine are stabilized, the stable operation of the power generation system is ensured, the problem of the reduction of the power generation efficiency caused by the fluctuation of the steam parameters is reduced, and the reliability of the power generation system is improved. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The waste heat power generation system of the steelmaking sintering circular cooler comprises a circular cooler, a turbine, a generator, a first-stage economizer, a second-stage economizer, an evaporator, a steam drum, a first-stage superheater and a second-stage superheater, wherein the circular cooler is provided with a low-temperature flue gas end, a medium-temperature flue gas end and a high-temperature flue gas end, the output end of the turbine is connected with the input end of the generator, the low-temperature flue gas end is connected with the second-stage economizer, the output end of the medium-temperature flue gas end is connected with the input end of the evaporator, the output end of the evaporator is connected with the first-stage economizer, and the output end of the first-stage economizer is connected with the other output end of the second-stage economizer; The steelmaking sintering circular cooler waste heat power generation system also comprises a phase change energy storage system and a control system; the phase change energy storage system comprises a heat storage tank, a heat release tank, a first temperature sensor, a second temperature sensor, a smoke three-way valve and a steam three-way valve; The smoke three-way valve is used for controlling the smoke flow direction of the outlet of the secondary economizer, and the steam three-