Device for completely utilizing steam energy for gas making, and method for utilizing steam

Abstract

The invention belongs to a device for completely utilizing steam energy for gas making, and a method for utilizing steam. The device comprises a 0.6-MPa steam pipeline; the 0.6-MPa steam pipeline is connected with a first electric regulating valve, an automatic main steam valve, a steam turbine, a first gate valve, a steam superheater pipe pass and the inlet of a steam buffer tank sequentially through a three joint; the third end of the three joint is connected with the inlet of the steam buffer tank through a second electric regulating valve; the outlet of the steam buffer tank is connected with the steam inlet of a fixed bed coal gasification furnace through a second gate valve; the semi-water gas outlet of the fixed bed coal gasification furnace is connected with the inlet of a cyclone dust collector; the gas outlet in the top of the cyclone dust collector is connected with a cooling and washing tower through the shell pass of the steam superheater; the device has the advantages of simple structure, operating stability, convenience in maintenance and operation, capability of reducing enterprise cost, environmental friendliness, energy conservation and capability of utilizing the steam energy maximally on the premise of guaranteeing the quality of the steam for gas making.

Description

technical field [0001] The invention belongs to the technical field of waste heat power generation, and in particular relates to a device for fully utilizing steam energy for gas production and a steam utilization method. Background technique [0002] Fixed-bed gas production needs to use steam and coal to react in the gasifier. The required steam parameters are: steam pressure 0.14MPa(A) (guaranteed to be blown into the furnace), and the temperature requirement is not lower than 210°C (at this temperature Nearby gas production benefits are higher), generally provided by high-pressure steam after steam turbines generate electricity. However, in the actual production process, the steam parameters that the steam turbine needs to provide are: 0.6MPa(A), 240°C. The reasons for the high steam supply parameters are as follows: 1. The steam pressure is high and it is easy to transport (the steam volume is relatively small, the pipeline is thinner, and the pipeline loss is small). ...

AI Technical Summary

Problems solved by technology

2. The exhaust steam pressure of the back pressure steam turbine determines the exhaust steam temperature. If the exhaust steam pressure is set too low, the exhaust steam temperature will decrease accordingly. In addition, the heat loss of the pipeline is large, and it may not meet the requirement of 210°C.

In addition, in actual operation, the 0.6MPa(A) steam is decompressed to 0.14MPa(A) through the pressure reducing valve, causing a lot of energy waste (4 times the expansion ratio)

Images