Energy-saving type boiler ultralow-load combustion stabilization system

An energy-saving boiler technology, applied in the control system, combustion method, combustion equipment, etc., can solve the problems of poor flame stability, blasting, and temperature drop, so as to promote ignition and burnout, improve the adaptability of pulverized coal, and improve the efficiency of boilers. efficiency effect

Pending Publication Date: 2019-10-29
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the combustion condition of the boiler is far lower than the designed minimum stable operating load, the temperature of the furnace will drop sharply, making it difficult t

Method used

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  • Energy-saving type boiler ultralow-load combustion stabilization system
  • Energy-saving type boiler ultralow-load combustion stabilization system
  • Energy-saving type boiler ultralow-load combustion stabilization system

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the energy-saving boiler ultra-low load stable combustion system provided in this embodiment is suitable for the single-channel pulverized coal heater system of the dry pulverization system. A three-stage steam heat exchanger is added to the pulverized coal pipeline between the coal mill and the boiler. The pulverized coal pipeline from the coal pulverizer is connected to the first-level heater, the second-level heater, and the third-level heater in sequence, and then enters the boiler. .

[0024] Extraction 4 (No. 4 extraction pipeline) is connected to the steam side inlet of the primary heater, and the steam side outlet of the primary heater is connected to the deaerator. 3 extraction (No. 3 extraction pipeline) is connected to the steam side inlet of the third stage heater, and the steam side outlet of the third stage heater is connected to the steam side inlet of the second stage heater through the steam pipeline, and the steam side outle...

Embodiment 2

[0029] Such as figure 2 As shown, the energy-saving boiler ultra-low-load stable combustion system provided in this embodiment is suitable for the pulverized coal heater system connected to a single coal pulverizer of the dry pulverization system. Three-stage steam heat exchangers are respectively added to the four pulverized coal pipes between the coal mill and the boiler, and the four pulverized coal pipes coming out of the coal mill are connected to the first-stage heaters 1 / 2 / 3 / 4, The secondary heater 1 / 2 / 3 / 4 and the tertiary heater 1 / 2 / 3 / 4 are connected to the boiler.

[0030] 4 extraction (No. 4 extraction pipeline) is connected to the steam side inlet of the primary heater 1 / 2 / 3 / 4, and the steam side outlet of the primary heater 1 / 2 / 3 / 4 is connected to the deaerator. 3 extraction (No. 3 extraction pipeline) is connected to the steam side inlet of the tertiary heater 1 / 2 / 3 / 4, and the steam side outlet of the tertiary heater 1 / 2 / 3 / 4 is connected to the secondary heating...

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Abstract

The invention provides an energy-saving type boiler ultralow-load combustion stabilization system. The energy-saving type boiler ultralow-load combustion stabilization system comprises a coal mill anda boiler which are connected through a pulverized coal pipeline, a steam heat exchanger is arranged on the pulverized coal pipeline between the coal mill and the boiler, the steam side of the steam heat exchanger is connected with the steam extraction end of a steam turbine through a steam extraction pipeline, the pulverized coal side of the steam heat exchanger penetrates through the pulverizedcoal pipeline between the coal mill and the boiler, and a steam flow regulating valve is arranged on the steam extraction pipeline. According to working condition change and requirements, the flow ofsteam entering the steam heat exchanger is adjusted so as to meet the requirements of combustion stabilization; according to the provided system, the extract steam of the steam turbine is utilized toenter high-efficiency spiral pulverized coal pipeline heaters to heat primary air and pulverized coal mixtures in the pulverized coal pipeline, pulverized coal firing and burnout can be flexibly promoted according to fuel combustion requirements, then pulverized coal adaptability of the boiler is improved, the boiler efficiency is greatly improved, moreover, pulverized coal firing and burnout under deep peak shaving working conditions are promoted, and stable combustion capability is high.

Description

technical field [0001] The invention relates to a boiler stable combustion system, in particular to an energy-saving boiler ultra-low load stable combustion system. Background technique [0002] With the further rise of coal prices, the fuel sources of my country's coal-fired units are increasingly diversified, and the coal types actually used by many units deviate from the designed coal types, resulting in some problems in the drying, ignition, and burnout of coal powder, especially When the boiler designed to burn low-moisture coal is replaced by high-moisture coal, the drying output will be insufficient, the pulverized coal will ignite slowly, and the center of the furnace flame will move upward, resulting in an increase in the incomplete loss of pulverized coal machinery and affecting the efficiency of the furnace. In severe cases , and even cause fouling and slagging of the horizontal flue and thermal deviation. [0003] With the increasing number of new energy units in ...

Claims

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Application Information

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IPC IPC(8): F22B35/00F22D1/50F23K1/00F23K3/00
CPCF22B35/00F22D1/50F23K1/00F23K3/00
Inventor 魏增涛熊显巍陶丽李剑宁
Owner SHANGHAI POWER EQUIP RES INST
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