A method and device for sintering vertical cooling main extraction steam-electric dual-drive waste heat regeneration power generation

Abstract

The invention discloses a sintered vertical cooling main extraction steam-electric dual drive waste heat regeneration power generation method and device, which discloses a sintered vertical cooling main extraction steam-electric dual drive including a vertical cooling stage, an air cooling stage, a waste heat utilization stage and a power generation feedback stage A method of waste heat regeneration power generation, and a shunt structure at the inlet of the sintering main exhaust fan, so that the air flow can be shunted, and the heat exchange with the falling sinter, and then the waste heat can be used to heat the boiler and provide heat to drive the steam turbine The method and device for power generation can independently drive the sintering main exhaust fan to work, and can also be driven by the steam turbine. The dual drive mode can increase the energy consumption of the synchronous motor. For the fluctuation of the steam turbine operating speed caused by the fluctuation of the steam volume, through the synchronous motor The speed adjustment is compensated to ensure the overall stability.

Description

technical field [0001] The invention relates to a method and a device for sintering vertical cooling main extraction steam electric double drive waste heat regeneration and power generation. The used method and device belong to the field of steel environmental protection. In particular, it relates to a method of disposing a flow distribution structure at the inlet of the sintering main exhaust fan, so that the air flow can be divided, and the falling sinter can be exchanged with heat, and then the waste heat can be used to heat the boiler and provide heat to drive the steam turbine to generate electricity. device. Background technique [0002] At present, in the sintering process of steel mills, a large amount of heat will be generated, and cooling needs to be carried out at the same time, during which there is a large amount of energy loss and waste. After mixing and pelletizing, the material undergoes a series of physical and chemical changes through high temperature com...

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Problems solved by technology

[0002] At present, in the sintering process of steel mills, a large amount of heat will be generated, and at the same time it needs to be cooled down. During this period, there will be a lot of energy loss and waste. Sintering is to mix various powdery iron-containing raw materials with an appropriate amount of fuel and flux, and add an appropriate amount Water, after mixing and sintering, burns at high temperature on the sintering equipment to cause a series of physical and chemical changes in the material, and bind the ore powder particles into blocks. After the sintering is completed, the temperature reaches 600°C-800°C. The cooling machine is used for cooling, and then transported to the next step. The existing sintering cooler mainly adopts ring cooling, vertical cooling and belt cooling. In the vertical cooling process, the hot sinter is placed in a closed vertical cylinder to avoid It overcomes the problem of large air leakage in the traditional cooling process and ensures the stability of the heat exchange process. However, the existing vertical cooling simply uses steam to drive the steam turbine to generate electricity. The energy supply form is single, and there is no loss during the transmission process. The power generation of the steam turbine is discontinuous, and the control stability is poor. It is necessary to install an additional heat supplement device to maintain the stability of the evaporation of the waste heat boiler

[0003] Publication number CN201288679 discloses a steam turbine and synchronous motor dual drive device, which is composed of a steam supply device, a steam turbine, a gearbox, a clutch, a fan and a synchronous motor connected to each other in sequence. Moreover, the heat exchange efficiency of the air flow and the thermal fluid is low, the heat exchange cannot be fully performed, and the heat utilization rate is low. At the same time, the fan in the device is set between the synchronous motor and the steam turbine, and the fan is controlled by the drive mode on both sides. Therefore, when switching the driving mode, there is a deflection torque on both sides of the fan, and there is a power loss

[0004] Publication number CN207262969U discloses a sintering waste heat power generation system, which includes a sintering ring cooling waste heat boiler, a sintering machine main flue waste heat boiler, a feed pump, a steam turbine, and a generator. The sintering ring cooling waste heat boiler includes a first steam drum and a second steam drum , the first economizer, the first superheater, the pressure of the first steam drum is higher than that of the second steam drum, the waste heat boiler in the main flue of the sintering machine includes the third steam drum and the second economizer, the outlet of the second steam drum is connected with the The water inlet of the feed water pump is connected, the water outlet of the feed water pump is connected with the water inlet of the first economizer and the second economizer, the water outlet of the first economizer is connected with the water inlet of the first steam drum, and the water outlet of the second economizer is connected with the water inlet of the second economizer The water inlet of the third steam drum is connected, and the steam outlets of the first steam drum and the third steam drum are connected with the steam inlet of the first superheater. The superheated steam generated by the first superheater rushes to the steam turbine to do work to drive the generator to generate electricity. Mainly for the ring cooling structure, due to the fast heat diffusion during the ring cooling process, the exchange space is not a closed area, so the amount of waste heat recovery is small, and the steam turbine is prone to instability

[0005] Publication No. CN108759476A discloses a system in which a sinter vertical cooler drives a steam turbine and directly drives a fan to recover waste heat, including a sinter vertical cooler; a waste heat boiler connected to the sinter vertical cooler, and the waste heat boiler includes a steam The outlet and the cold air outlet at its bottom; the waste heat conversion device connected with the steam outlet; and the circulation fan connected with the cold air outlet, the circulation fan is connected with the sinter vertical cooler, in the process of this device, the fan draws the airflow and the internal The waste heat cannot be fully exchanged, and the utilization rate of waste heat is low

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