Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant

An ammonium hydrogen sulfate, coal-fired boiler technology, applied in the combustion method, removal of solid residue, combustion product treatment and other directions, can solve problems such as high cost, reduce economic losses, improve economy and reliability, and reduce resistance. Effect

Active Publication Date: 2014-12-03
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of each start-up and shutdown of the unit is huge. Taking a 300MW unit as an example, the cost of each start-up and stop of the unit is about 1 million yuan

Method used

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  • Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant
  • Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant
  • Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant

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Embodiment 1

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] as attached figure 1 For the typical flue gas system of a coal-fired boiler in a thermal power plant shown, when the unit load is 50% peak load, the operation steps are as follows:

[0033] (1) During normal operation, with figure 1 All dampers are shown in the fully open position.

[0034] (2) When the peak load of the unit reaches 50%, the operation of a single air preheater can meet the requirements. Suppose it is necessary to clear the blockage of ammonium bisulfate in air preheater A and keep air preheater B in normal operation. Firstly, keep the contact baffle plate 1 of the primary air duct at the inlet of the air preheater fully open;

[0035] (3) Keep the connecting baffle plate 2 of the secondary air duct at the inlet of the air preheater fully open;

[0036] (4) Close the baffle plate 3 of the primary air duct at the outlet of the...

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Abstract

The invention discloses a method for online elimination of ammonium bisulfate clogging of air pre-heaters of a coal-fired boiler of a thermal power plant. A unit load regulation low-load period is used, according to a reversibility principle of an ammonium bisulfate deposition process, an operation regulation method is put forward, so that one air pre-heater on one single side is isolated from air, a small quantity of high-temperature flue gas is fed, the overall part temperature of each air pre-heater is gradually increased, liquid ammonium bisulfate attached to heat-transfer elements is gasified, and clogging is eliminated. At present, load regulation is frequently performed on coal-fired units in China, and long low-load operation periods exist at night frequently, so that the units can use the load regulation low-load period frequently to perform alternating ammonium bisulfate clogging elimination on air pre-heaters, resistance of the air pre-heaters is reduced, high-pressure water washing after shutdown is avoided, and economic losses are reduced.

Description

technical field [0001] The invention relates to a method for eliminating ash plugging in a coal-fired boiler, in particular to an online method for eliminating ash plugging in an air preheater of a coal-fired boiler in a thermal power plant Background technique [0002] In accordance with the requirements of GB13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants", starting from 2014, the NOx emission standard of coal-fired boilers in existing thermal power plants has reached 100mg / m 3 the following. Therefore, at present, coal-fired boilers in thermal power plants generally adopt the selective catalytic reduction (SCR) flue gas denitrification method. In the SCR process, the reducing agent NH 3 (such as ammonia or urea) is sprayed into the flue gas, and under the conditions of a specific temperature range (320 ° C ~ 450 ° C) and the presence of catalyst and oxygen, NH 3 Selectively react with NOx in flue gas and reduce NOx to N 2 and H 2 O. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J3/02
Inventor 赵晴川高建军周新刚姜波董建
Owner STATE GRID CORP OF CHINA
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