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On-line high-pressure water washing method for rotary air preheater of full-bag dust removal coal-fired boiler

A technology for bag dust removal and coal-fired boilers, which is applied in the direction of flushing, combustion technology relief, and cleaning of heat transfer devices. poor effect

Active Publication Date: 2020-01-03
DATANG BINZHOU POWER GENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the inconvenient high-pressure water washing of the full-bag dedusting type boiler air preheater in the prior art, and to provide an online high-pressure water washing method for the full-bag dedusting type coal-fired boiler rotary air preheater, It can effectively reduce the pressure difference caused by the dust blocking of the air preheater, and at the same time, it can avoid the phenomenon of bag dust filter bag sticking, reduce the power consumption of the induced draft fan, and improve the load capacity of the boiler

Method used

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  • On-line high-pressure water washing method for rotary air preheater of full-bag dust removal coal-fired boiler
  • On-line high-pressure water washing method for rotary air preheater of full-bag dust removal coal-fired boiler
  • On-line high-pressure water washing method for rotary air preheater of full-bag dust removal coal-fired boiler

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Experimental program
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Effect test

Embodiment 1

[0036] The online high-pressure water flushing method for the rotary air preheater of the full-bag dedusting coal-fired boiler in this embodiment is carried out according to the following steps:

[0037] a. Preliminary preparation, stop soot blowing at the cold end of the flue gas side of the air preheater before flushing to ensure a high exhaust gas temperature, and keep the exhaust gas temperature of the air preheater during flushing not less than 120°C; thus ensuring flushing water and evaporation And control the humidity of the flue gas to prevent the bag filter from sticking to the bag;

[0038] b. Check that the current of the air preheater is normal. When the load of the unit is not less than 200MW, carry out online water flushing of the air preheater; The opening of the induced draft fan blades should be appropriately increased to ensure that the furnace pressure is maintained at -50Pa; the operating load of the unit should not be too low during flushing, so as to prev...

Embodiment 2

[0046] The on-line high-pressure water flushing method for the rotary air preheater of the full-bag dedusting coal-fired boiler in this embodiment is basically the same as that in Embodiment 1, except that the opening of the rotor vane of the induced draft fan on the flushing side is adjusted before flushing in step b of this embodiment. Turn it down by 10%, increase the opening of the fan blade on the other side, and maintain the furnace pressure at -100Pa; the temperature of the flushing water used is 30°C; when flushing in step c, the flushing water gun is stepped back from the inside to the outside by 2cm each time, The dwell time at the innermost flushing position is 4 minutes, and every time you step back 15 times, increase the flushing time by 2.5 minutes, and observe the pressure difference change after flushing, and adjust the flushing time in each area.

Embodiment 3

[0048] The on-line high-pressure water flushing method for the rotary air preheater of the full-bag dedusting coal-fired boiler in this embodiment is basically the same as that in Embodiment 1, except that the opening of the rotor vane of the induced draft fan on the flushing side is adjusted before flushing in step b of this embodiment. Turn it down by 6%, increase the opening of the fan blade on the other side, and maintain the furnace pressure at -80Pa; the temperature of the flushing water used is 20°C; when flushing in step c, the flushing water gun is stepped back from the inside to the outside by 3cm each time, The dwell time at the innermost flushing position is 6 minutes, and every time you step back 25 times, increase the flushing time by 2 minutes, and observe the pressure difference change after flushing, and adjust the flushing time in each area.

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Abstract

The invention discloses an on-line high-pressure water flushing method for a complete cloth bag dust removal type coal-fired boiler rotary air pre-heater, and belongs to the field of the air pre-heaters. The specific construction scheme is that a operation platform with a certain area is set up on one outer side of the air pre-heater needing to be flushed; a track and a flushing trolley are placedon the operation platform, and a hole is formed in the lower portion of a heat transfer element of an air pre-heater shell allowing the track to entry and exit; and flushing is carried out graduallyfrom the position, close to the center of a heat exchange element of the air pre-heater to the outside during washing, the flushing time is controlled according to the rotating speed of the air pre-heater and the penetrating power of a high-pressure water torch, the flushing trolley is carried out upward-flushing in vertical and upward modes, so that the dirty attached to the cold junction and themedium-temperature junction are cleared away and dredged. According to the method, the problem of differential pressure rise in the continuous operation process of the complete cloth bag dust removaltype coal-fired boiler rotary air pre-heater can be effectively reduced, the bag sticking phenomenon of a cloth bag dust removal filter bag can be avoided, the requirements on the load and the environment are not high, the whole operation time is shortened, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of air preheaters, and more specifically, relates to an online high-pressure water washing method for a rotary air preheater of a full-bag dust removal type coal-fired boiler. Background technique [0002] Due to the increasingly stringent national environmental protection policies, coal-fired power plants mostly use liquid ammonia as a reducing agent to reduce the nitrogen oxides in the flue gas. Due to the objective existence of ammonia escape, it reacts with the sulfide in the flue gas to form ammonium bisulfate. on the surface of the air preheater. Ammonium bisulfate is a highly viscous substance, and it is easy to generate dust and block the air preheater. With the continuous operation of the unit, the blockage of the internal heat storage element of the preheater gradually increases, which seriously affects the output of the unit and the efficiency of the boiler. Therefore, it is necessary to take me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J15/02F23J15/06F28G9/00
CPCF23J15/025F23J15/06F28G9/00Y02E20/30
Inventor 刘德进宋若华张超孙德金丁浩庚永新
Owner DATANG BINZHOU POWER GENERATION CO LTD
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