Integral rotational radiation preheating mixing energy utilization device with flue gas chilling

Abstract

The invention relates to an integral rotational radiation preheating mixing energy utilization device with flue gas chilling. The device comprises a gasification furnace body and a heat recovery unit, which are connected with each other through a flange; the heat recovery unit comprises a pressurized shell, a syngas inlet, a radiation heat exchange component, a flue gas chilling component, a convection heat transfer component, an attemperator component, a slag tank and a syngas outlet; the gasification furnace body is communicated with the heat recovery unit through the syngas inlet; syngas is subjected to radiation heat exchange and then chilling for temperature reduction, and then liquid slag falls into the slag tank for discharge; and the syngas reversely flows up, and is subjected to convection heat transfer for temperature reduction. The device integrates radiation heat exchange, flue gas chilling and convection heat transfer effectively, and can be used for an IGCC (Integrated Gasification Combined Cycle) power generation system, the sensible heat of crude syngas is absorbed to produce high-pressure steam or medium-pressure steam to generate power, the entire energy utilization rate is increased greatly, the energy recycling rate is high, the overall dimension of a waste-heat recovery boiler is reduced effectively, the manufacturing, transporting and installing are more convenient, and the problem of dust stratification on convection heat transfer surface can be eliminated.

Description

technical field [0001] The invention relates to an energy utilization device of coal gasification technology, in particular to an integrated rotary radiation preheating hybrid energy utilization device with flue gas chilling. Background technique [0002] The integrated gasification combined cycle power generation system (IGCC) can realize efficient, clean and diversified utilization of coal, and is also the key to the development of coal-based power generation in the future. 2 Zero emission—that is, one of the core technologies of "green coal power" coal. In the IGCC power generation system, the waste heat boiler is the key equipment for recovery and utilization of sensible heat and the major equipment in the gasification island. The recovery and utilization of the sensible heat of high-temperature gas and molten slag by the waste heat boiler will make the efficiency of hot gas reach 90-95%, and the efficiency of power generation Reaching 42 to 45%, the operation of the wa...

AI Technical Summary

Problems solved by technology

However, the waste heat boilers in the prior art still have problems such as complex structure and short service life, which are mainly manifested in:

[0003] (1) Shell pulverized coal gasification technology uses 1.3 to 1.5 times the circulating cold air to quench the high-temperature syngas, which increases the size of the convective waste heat boiler and its subsequent syngas dust removal equipment, and increases the investment in equipment, and the syngas circulation compressor increases The energy consumption of the gasification device is reduced; due to the ash accumulation in the convection boiler, the heat transfer effect of the convection boiler is affected, and it is necessary to add more quenching air than the designed chilling air volume

[0004] (2) The full sensible heat recovery system for syngas in the GE coal-water slurry gasification process consists of two devices: a radiant waste heat boiler and a convective waste heat boiler. The two devices are arranged independently, resulting in large equipment investment, large space occupation, and reliable system operation. The reliability is also affected by the complexity of the equipment; at the same time, the temperature of the syngas in the radiant boiler lacks adjustment means, which leads to the ash accumulation and blockage of the convection boiler

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