Steam extraction and heat supply system capable of flexibly cutting off low-pressure cylinder and control method

A technology of steam extraction for heat supply and control method, which is applied in the direction of steam application, steam engine device, combined combustion mitigation, etc. It can solve the problems of low heat supply capacity and poor operation adjustment flexibility of steam extraction heat supply units, so as to improve the heat supply capacity and peak shaving capacity and unit load adaptability, and the effect of economic transformation technology

Active Publication Date: 2017-09-15
GUODIAN SCI & TECH RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The flexibility and control method of the steam extraction heating system with the low-pressure cylinder removed provided by the present invention can solve the technical problems of low heating capacity and poor operation adjustment flexibility of current extraction steam heating units

Method used

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  • Steam extraction and heat supply system capable of flexibly cutting off low-pressure cylinder and control method
  • Steam extraction and heat supply system capable of flexibly cutting off low-pressure cylinder and control method
  • Steam extraction and heat supply system capable of flexibly cutting off low-pressure cylinder and control method

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Embodiment Construction

[0033]The steam extraction heating system of the prior art steam extraction heat supply unit directly supplies steam to the heating network heater, and the pressure of the heating and extraction steam is adjusted through the low-pressure cylinder steam inlet butterfly valve to ensure the safe operation of the low-pressure cylinder. During the hot period, the back pressure of the wet cooling unit is maintained at 4-6kPa, the back pressure of the air-cooling unit is maintained at 8-10kPa, and a single low-pressure cylinder guarantees a minimum intake cooling flow of 120-150t / h. At this time, the final blade of the low-pressure cylinder is already in a certain blowing operation state, the actual efficiency of the final blade of the low-pressure cylinder is lower than 30%, and the final stage of some units may also have negative work. Under such back pressure conditions, if the inlet steam flow rate of the low-pressure cylinder is further directly and greatly reduced, the blowing s...

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Abstract

The invention discloses a steam extraction and heat supply system capable of flexibly cutting off a low-pressure cylinder and a control method. According to the system, an auxiliary vacuumizing system is additionally arranged on an original unit vacuumizing system, the vacuumizing capacity of an original vacuum pump is effectively improved, and ultra-low back-pressure safe and stable operation of a unit is achieved; a low-pressure cylinder steam inlet bypass pipeline system is additionally arranged on a middle-low pressure communication pipe of an original steam extraction and heat supply unit, wherein the low-pressure cylinder steam inlet bypass pipeline system is composed of a low-pressure cylinder steam inlet cooler, a minimum cooling steam direct-through pipeline, a cooling steam small-flow adjusting pipeline and a cooling steam large-flow adjusting pipeline, and flexible transformation of the steam extraction and heat supply unit is achieved; and besides, a control system capable of operating flexibly and safely according to the different heat supply quantities and the electric load conditions of the unit is designed.

Description

technical field [0001] The invention relates to a technology and an operation control system for flexible removal of a low-pressure cylinder of a steam extraction and heating unit, in particular to the operation of a steam extraction and heating unit with a large heat supply and high peak-shaving capability requirements for flexible removal of the low-pressure cylinder System transformation and operation control technology. Background technique [0002] At present, in order to ensure the safe operation of the low-pressure cylinder, the extraction steam turbine is usually designed with a minimum intake cooling flow rate of 120-150t / h for a single low-pressure cylinder. In the actual operation process, due to the large minimum flow capacity of the design of the low-pressure cylinder inlet butterfly valve, and the large diameter of the low-pressure cylinder inlet butterfly valve, the controllability of the equipment is poor, and the butterfly valve is generally controlled manua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K17/02F01K13/00F01K13/02F01K9/04
CPCF01K9/04F01K13/00F01K13/02F01K17/02Y02E20/14
Inventor 马庆中李永生石红晖王磊康朝斌陈阳曹蓉秀冯云鹏张伟王桂萍
Owner GUODIAN SCI & TECH RES INST
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