Steam power system and chemical engineering system for preparing olefins from coal

Abstract

The invention discloses a steam power system and a chemical engineering system for preparing olefins from coal. The steam power system comprises boilers provided with reheating systems and steam turbines, the steam turbines comprise high pressure cylinders being connected with and driving electric generators to generate electricity, live steam generated by the boilers is supplied to the high pressure cylinders so that the high pressure cylinders can do work, after work is done, waste steam backflows to the reheating systems, reheated steam is formed after heating is conducted, and the reheatedsteam is supplied into a process turbine system (7) of the chemical engineering system. After the reheated steam is supplied to the process turbine system, the rest of the reheated steam can be supplied to and drive intermediate pressure cylinders and low pressure cylinders to do work and generate electricity. Waste steam generated by the process turbine system, the intermediate pressure cylinders and the low pressure cylinders are subjected to condensation through a condenser (11), condensate water serves as boiler feed water to circulate and backflow to the boilers after being subjected toheating and deoxidizing through a heater and a deaerator (13), and heating heat-sources of the heater and the deaerator come from process steam generated by the process system. According to the steampower system, the conflict between steam production and electric energy production can be well resolved, and unit zero standby is achieved.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and in particular relates to a coal-to-olefin chemical system and a steam power system thereof. Background technique [0002] In the coal-to-olefins project, the basic design principle of the steam power system is to "determine electricity by heat", that is, to meet the steam requirements of the process olefins first, the new steam generated by the boiler is preferably supplied to the process turbine system, and secondly to provide self- generate electricity. This has strict requirements on the reliability of steam supply, resulting in the following problems in existing projects: [0003] a) Low parameters and high coal consumption. For example, the scale of existing coal-to-olefins projects is generally 500,000-600,000 tons of olefins per year, and the power demand of the whole plant is 250MW, 40% of which is used by multiple air separation turbines. The installed capacity of power generat...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of low power generation and high coal consumption caused by the inability of the existing steam power system to solve the contradiction between steam production and power generation, and to provide a steam power system that can well solve the problem of steam production The contradiction between the power generation and the steam power system with a higher power generation

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