Unlock instant, AI-driven research and patent intelligence for your innovation.

Bypass system and operation method for reducing dry and wet critical load point of supercritical unit

A supercritical unit and critical load technology, applied in the direction of combustion method, valve configuration, superheat temperature control, etc., can solve the problem of low steam superheat, achieve low dust content, low temperature, and prolong service life

Active Publication Date: 2021-08-03
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention is to solve is the technical problem of low steam superheat in the process of reducing the load of the existing supercritical unit, and provides a bypass system for reducing the critical load point of the dry and wet state of the supercritical unit, which passes through the bypass system Properly increase the steam superheat degree of the supercritical unit under low-load conditions to reduce the critical load point in dry and wet states

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bypass system and operation method for reducing dry and wet critical load point of supercritical unit
  • Bypass system and operation method for reducing dry and wet critical load point of supercritical unit
  • Bypass system and operation method for reducing dry and wet critical load point of supercritical unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a bypass system for reducing the critical load point of the supercritical unit in the wet and dry state. The schematic diagram of the structure is as follows Figure 1-3 As shown, the bypass system includes a bypass flue 1, a first cooling chamber 2, a second cooling chamber 3, a front ash hopper 4, a rear ash hopper 5, an adjustment baffle 6, an isolation baffle 7, The first connecting channel 8 , the second connecting channel 9 and the cooling medium inlet 10 . The cooling medium inlet is a circular hole located on the right side of the second cooling chamber 3 .

[0043] The bypass flue 1 includes the inlet end of the bypass flue, the horizontal section of the bypass flue and the outlet end of the bypass flue, and the horizontal section of the bypass flue is located at the inlet end of the bypass flue and the outlet end of the bypass flue between.

[0044] The inlet of the bypass flue is connected to the original flue between the furnace ou...

Embodiment 2

[0051] This embodiment provides a method for operating a bypass system for reducing the dry and wet critical load point of a supercritical unit, which includes steps:

[0052] a) Obtain new dry and wet state critical load points through experiments. Starting from the original dry-wet state conversion load point, gradually reduce the load of the unit, open the bypass flue isolation baffle 7 during the load reduction process, and adjust the adjustment baffle 6 of the bypass flue to keep the steam superheat not less than 5 ℃, repeatedly adjusted until the baffle is fully opened, indicating that the unit has reached the minimum load to maintain dry operation, and this working condition is the new dry-wet critical load point.

[0053] b) Record the reference curve of "unit load-regulating baffle opening". During the test in step a), record the corresponding relationship between the load of the unit and the opening of the regulating baffle to form a reference curve of "unit load-op...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a bypass system and an operation method for reducing the dry-wet state critical load point of a supercritical unit. The technical solution adopted in the present invention is: the bypass system of the present invention includes a bypass flue, a first cooling chamber, a second cooling chamber, a front row of ash hoppers, a rear row of ash hoppers, an adjusting baffle, an isolation baffle, a first The connecting channel and the second connecting channel; part of the high-temperature flue gas is sent to the flue gas side of the economizer through the bypass system, so as to increase the heat absorption of the feed water in the economizer, so that the degree of superheat of the steam can be appropriately increased under the same amount of fuel. High, thus reducing the critical load point of the dry and wet state of the unit. The bypass system of the present invention is provided with a cooling chamber, which provides cooling protection for the bypass flue adjustment baffle and the isolation baffle, ensures that the baffle moves flexibly and reliably, and prolongs the service life of the baffle; the operation method of the bypass system of the present invention It can reduce the critical load point of the dry and wet state of the unit, and realize the purpose of improving the auxiliary peak-shaving ability of the unit.

Description

technical field [0001] The invention belongs to the technical field of load control of a supercritical unit, in particular to a bypass system for reducing the critical load point of a supercritical unit in a dry and wet state and an operation method thereof. Background technique [0002] The supercritical unit has two operating modes: dry state and wet state. Under normal operating conditions, the supercritical unit operates in a dry state. When the load of the unit decreases, due to the decrease of the superheat of the steam, the water level of the water storage tank at the lower part of the steam-water separator gradually increases, and the feedwater flow gradually approaches the minimum flow protection value of the water cooling wall. In order to ensure the safe operation of the supercritical unit, the supercritical unit needs to be dry state conversion. The load point at which the supercritical unit performs dry-wet state conversion is called the dry-wet state critical...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F22G5/04F22D1/00F23L11/00F23J3/02
CPCF22D1/003F22G5/04F23J3/02F23L11/00
Inventor 吕洪坤张晓龙胡建根
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY