Integrated sarciniform radiation preheating hybrid heat recovery device with flue gas chilling function

Abstract

The invention relates to an integrated sarciniform radiation preheating hybrid heat recovery device with a flue gas chilling function. High-temperature synthesis gas and melting slag enter a radiation heat exchange component from a synthesis gas inlet of the device and enter a gas mixer chamber of a flue gas chilling component to be ventilated and cooled after radiation heat exchange, then solid coal slag enters a slag bath, and the synthesis gas is reflexed upwards to enter a convection heat exchange component, flows through an evaporator, an overheater and a coal economizer in sequence to be heat-exchanged and cooled, and then is discharged from a synthesis gas outlet. According to the invention, radiation heat exchange, flue gas chilling and convection heat exchange are combined effectively; the device can be applied to an IGCC (integrated gasification combined cycle) power generation system; and sensible heat of rough synthesis gas is absorbed to generate high pressure steam or medium pressure steam for power generation, so that the integral energy utilization ratio is improved greatly, the energy recovery and utilization ratio is high, the integral size of a waste heat boiler is reduced effectively, manufacturing, transportation and mounting are more convenient, and the problem of dust deposition of a convection heat exchange face can be eliminated.

Description

technical field [0001] The invention relates to a thermal gasification furnace of coal gasification technology, in particular to an integrated beam radiation preheating mixed heat recovery device with flue gas quenching. 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". 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 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 waste heat boiler w...

AI Technical Summary

Problems solved by technology

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

[0004] (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 exchange effect of the convection boiler is reduced. To ensure the heat exchange, it is necessary to add more chilled air than the designed chilled air volume

[0005] (2) The full sensible heat recovery system of syngas in GE coal-water slurry gasification process consists of two equipments: radiant waste heat boiler and convection waste heat boiler. The equipment requires a large investment and occupies a large space. At the same time, the reliability of the system operation is also due to the equipment Affected by the complexity; at the same time, the lack of adjustment means for the syngas temperature of the radiant boiler causes the ash accumulation of the convection boiler to block

Images