CN109373340B - Online high-pressure water washing method for rotary air preheater of full-cloth-bag dust removal type coal-fired boiler - Google Patents
Online high-pressure water washing method for rotary air preheater of full-cloth-bag dust removal type coal-fired boiler Download PDFInfo
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- CN109373340B CN109373340B CN201811248497.3A CN201811248497A CN109373340B CN 109373340 B CN109373340 B CN 109373340B CN 201811248497 A CN201811248497 A CN 201811248497A CN 109373340 B CN109373340 B CN 109373340B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses an online high-pressure water washing method for a rotary air preheater of a full-cloth-bag dust removal type coal-fired boiler, and belongs to the field of air preheaters. The concrete construction scheme is as follows: an operation platform with a certain area is erected on one side outside the air preheater to be washed; placing the track and the flushing vehicle on an operation platform, and cutting holes at the position below the heat transfer element of the shell of the air preheater to be suitable for the track to enter and exit; when the air preheater heat exchange element is cleaned, the air preheater heat exchange element is gradually cleaned outwards from the center, the cleaning time is controlled according to the rotating speed of the air preheater and the penetrating power of the high-pressure water gun, the cleaning vehicle vertically upwards cleans the cold end and the medium-temperature end, and the dirt attached to the cold end and the medium-temperature end is removed and dredged. The invention can effectively reduce the problem of differential pressure rise in the continuous operation process of the rotary air preheater of the full cloth bag dust removal type coal-fired boiler, can avoid the bag pasting phenomenon of the cloth bag dust removal filter bag, has low requirements on load and environment, shortens the time of the whole operation and has lower cost.
Description
Technical Field
The invention relates to the technical field of air preheaters, in particular to an online high-pressure water washing method for a rotary air preheater of a full-cloth-bag dust removal type coal-fired boiler.
Background
As the national environmental protection policy is more and more strict, the coal-fired power plant mostly adopts liquid ammonia as a reducing agent to reduce nitrogen oxides in flue gas, and ammonium bisulfate generated by the reaction of ammonia escaping objectively exists in the flue gas and sulfides in the flue gas is attached to the surface of the air preheater. Ammonium bisulfate is a very viscous substance and is easy to generate dust accumulation to cause the blockage of an air preheater. Along with the continuous operation of the unit, the blocking condition of the heat storage element in the preheater is gradually increased, and the unit output and the boiler efficiency are seriously influenced. Therefore, measures need to be taken for the air preheater to reduce the differential pressure of the air preheater, and high-pressure water flushing of the air preheater is one of the common methods. However, the existing water washing of the air preheater is only suitable for the coal-fired boiler configured with electric dust removal or the coal-fired boiler with the mixture of the front electric dust removal and the back bag dust removal, and the domestic washing experience of the coal-fired boiler with complete bag dust removal is not much. The traditional high-pressure water washing technology is not suitable for washing the rotary air preheater of the complete cloth bag dust removal type coal-fired boiler by water, and the reasons are as follows:
the bag-type dust collector requires that the temperature of the inlet smoke can not be too high or too low. For example, filter bags made of PPS (30% of the surface layer of superfine fiber) + PTFE base cloth require the smoke temperature change range of 105 ℃ and 160 ℃. If the temperature of the inlet smoke is too high, the burning loss of the filter bag of the bag-type dust collector can be caused. If the inlet smoke temperature is too low, the water vapor content in the smoke is too high, which may cause the filter bag to be stuck, thereby causing the increase of the bag differential pressure, the reduction of the ash removal effect, the increase of the power consumption of the induced draft fan, and the influence on the boiler efficiency and the load carrying capacity. The traditional high-pressure water washing technology is easy to cause bag pasting of a bag-type dust removal filter bag due to the large washing water amount. If the washing water quantity is simply reduced, the washing pressure is inevitably reduced, and the purpose of washing the air preheater cannot be achieved. On the other hand, the traditional high-pressure water washing technology has poor washing effect on the air preheater due to low washing pressure.
By way of retrieval, application No.: 2015104771154, respectively; application date: 8, 6 months and 2015, the invention creates the name: an intelligent online flushing system for solving the problem of ash blockage of an air preheater; the washing gun tube of the washing device is arranged on the flue gas outlet side of the rotary air preheater, namely the bottom of the air preheater, the spray head is arranged upwards, the accumulated dust of the air preheater can be quickly washed down by using a high-pressure small-flow washing mode, the ventilation resistance of the flue gas heat exchanger is greatly reduced, and the heat exchange efficiency of the air preheater is improved; as another example, application No.: 2017105829166, respectively; application date: 7, 17 months in 2017, the invention and creation name is as follows: the rotary air preheater on-line cleaning device and the cleaning method thereof; the application realizes the ash removal and scale removal of the air preheater by utilizing the cleaning of a single-phase medium or a double-phase medium of hot air pulse and high-pressure water jet. The above applications are good washing schemes, but the rotary air preheater of the full cloth bag dust removal type coal-fired boiler still has no strong pertinence, and how to avoid the problem that the bag of the cloth bag dust removal filter bag is stuck is still a direction worth researching in the industry.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that a full-cloth-bag dust-removal type boiler air preheater in the prior art is not convenient for high-pressure water washing and is easy for filter bag pasting, and provides an online high-pressure water washing method for the full-cloth-bag dust-removal type coal-fired boiler rotary air preheater, which can effectively reduce the pressure difference caused by ash blockage of the air preheater, simultaneously can avoid the phenomenon of bag pasting of the cloth-bag dust-removal filter bag, reduce the power consumption of a draught fan and improve the load carrying capacity of the boiler.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses an online high-pressure water washing method of a rotary air preheater of a full-cloth-bag dust removal type coal-fired boiler, which comprises the following steps of:
a. before washing, stopping blowing dust at the cold end of the smoke side of the air preheater, and keeping the smoke discharge temperature of the washing air preheater to be not less than 120 ℃;
b. checking that the current of the air preheater is normal, and carrying out online water washing work on the air preheater when the unit load is not lower than 200 MW;
c. the washing vehicle is vertically upward for upward washing, the washing process is gradually performed from the position close to the center of the heat exchange element of the air preheater, and the washing water gun is kept in an upright state and does not collide with surrounding objects in the washing process;
d. monitoring the change curves of the current of the flushing air preheater, the exhaust gas temperature of the outlet of the air preheater, the primary air temperature of the outlet of the air preheater, the secondary air temperature and the smoke temperature of the inlet of the lateral bag dust collector during flushing, and stopping on-line flushing once abnormal.
Furthermore, before the washing in the step b, the opening degree of the moving blade of the induced draft fan on the washing side is reduced by 5-10%, the opening degree of the moving blade of the induced draft fan on the other side is increased, and the pressure of the hearth is maintained at-50-100 Pa.
Furthermore, in the step d, when the current of the air preheater is more than 23A or/and the temperature of the exhaust smoke at the outlet of the air preheater is less than 90 ℃ or/and the temperature of the primary air at the outlet of the air preheater or/and the temperature of the secondary air at the outlet of the air preheater is less than 120 ℃ or/and the temperature of the exhaust smoke at the dust removal inlet of the washing side cloth bag is less than 90 ℃, the online washing of the air preheater is stopped.
Furthermore, the step d also comprises the steps of monitoring the pressure difference of the dust removing cloth bag, continuously operating the rotary blowing of the dust removing cloth bag, and stopping the online water washing of the air preheater when the pressure difference of the dust removing cloth bag exceeds 1300Pa and is not reduced continuously.
Furthermore, step d also comprises monitoring a flue gas side pressure difference curve of the air preheater, and stopping on-line flushing when the pressure difference tends to increase.
Further, the temperature of the flushing water used is 15-30 ℃.
Further, the amount of rinsing water used in the rinsing process does not exceed 40 liters/minute.
Furthermore, the flushing water gun retreats from inside to outside for 2-3cm each time during flushing in the step c, the retention time of the innermost flushing position is 4-6min, the flushing time is increased by 2-2.5min each time the flushing water gun retreats for 15-25 times, the change of the pressure difference after flushing is observed, and the flushing time of each area is adjusted.
Furthermore, when the water gun is washed in the step c, the water gun is moved back and forth for 2.5cm each time, the retention time of the innermost washing position is 5min, and the water gun is moved back and forth for 20 times each time, so that the washing time is increased by 2 min.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
1. according to the online high-pressure water washing method for the rotary air preheater of the full-cloth-bag dust removal type coal-fired boiler, the cold end soot blowing of the flue gas side of the air preheater is stopped before washing so as to ensure higher flue gas temperature and keep the flue gas temperature of the washing air preheater not less than 120 ℃; thereby ensuring the flushing water and the evaporation capacity and controlling the flue gas humidity and preventing the bag pasting of the bag-type dust collector.
2. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler is characterized in that online water washing work of the air preheater is carried out when the unit load is not lower than 200MW, the operation load is not too low to control, and the phenomenon that the flue gas humidity is high and bag pasting phenomenon of a bag-type dust remover is possibly caused due to too low flue gas temperature at the outlet of the air preheater is prevented.
3. According to the online high-pressure water washing method for the rotary air preheater of the full-cloth-bag dust removal type coal-fired boiler, the opening degree of the movable vane of the induced draft fan at the washing side is reduced by 5-10% before washing, and the opening degree of the movable vane of the induced draft fan at the other side is properly increased, so that the pressure of a hearth is guaranteed to be maintained at-50 to-100 Pa; the draught fan is prevented from reaching a stall area to cause the stalling of the draught fan when the high load is carried out by adjusting the output deviation of the draught fans on the two sides.
4. According to the on-line high-pressure water washing method for the rotary air preheater of the full-cloth-bag dust removal type coal-fired boiler, the change curves of the current of the washing air preheater, the exhaust gas temperature of the outlet of the air preheater, the primary air temperature of the outlet of the air preheater, the secondary air temperature and the smoke temperature of the dust removal inlet of the cloth bag at the washing side are monitored in the washing process, once the on-line washing is stopped abnormally, the pressure difference caused by the ash blockage of the air preheater is effectively reduced, and the bag pasting phenomenon of the cloth bag dust removal filter bag is effectively avoided.
Drawings
FIG. 1 is a schematic flow chart of the on-line high-pressure water washing method of a rotary air preheater of a full-bag dust removal type coal-fired boiler according to the present invention;
FIG. 2 is a schematic view of the structure of the flushing vehicle of the present invention;
fig. 3 is a schematic view of the structure of the flushing track of the present invention.
The reference numerals in the schematic drawings illustrate: 100. flushing the track; 200. a base; 210. a pulley; 300. a column; 400. a top frame; 410. a clamping frame; 500. and (5) flushing a water gun.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
The online high-pressure water washing method of the rotary air preheater of the full-cloth-bag dust removal type coal-fired boiler comprises the following steps of:
a. preparing in an early stage, stopping blowing dust at a cold end of a smoke side of the air preheater before flushing so as to ensure higher smoke discharge temperature and keeping the smoke discharge temperature of the air preheater under flushing measurement not less than 120 ℃; thereby ensuring the flushing water and the evaporation capacity and controlling the flue gas humidity, and preventing the bag from being stuck by the bag-type dust collector;
b. checking that the current of the air preheater is normal, and carrying out online water washing work on the air preheater when the unit load is not lower than 200 MW; specifically, before flushing, the opening degree of the movable blade of the induced draft fan at the flushing side is reduced by 5%, and the opening degree of the movable blade of the induced draft fan at the other side is properly increased, so that the pressure of a hearth is ensured to be maintained at-50 Pa; the operation load of the unit is controlled not to be too low during flushing, the phenomenon that the flue gas humidity is high due to too low temperature of the flue gas at the outlet of the air preheater is prevented, bag pasting of a bag-type dust remover can occur possibly, the change of the bag-type dust removing pressure difference is strictly monitored in the whole flushing process and compared with the pressure difference under the same-load working condition before flushing, and more accidents caused by the fact that the bag pasting cannot be found out can be prevented; meanwhile, the output of the induced draft fan needs to be measured by flushing during high load, and the induced draft fan is prevented from reaching a stall area during high load to cause the stall of the induced draft fan by adjusting the output deviation of the fans at two sides;
c. when in washing, the washing vehicle vertically faces upwards, the washing process is gradually carried out from the position close to the center of the heat exchange element of the air preheater, and the washing water gun is kept in an upright state and does not collide with surrounding objects in the washing process; during washing, the washing time and the pulling distance of the washing vehicle are controlled according to the rotating speed of the air preheater and the penetrating power of the high-pressure water gun, the washing vehicle vertically faces upward to wash, dirt attached to the cold end and the medium temperature end is removed and dredged, and the blocked dirt evaporates along with smoke through the penetrating water of the high-pressure water gun, so that the cold end and the medium temperature end section are dredged, dirt mixed between plates in the air preheater is removed, and the purpose of washing is achieved;
d. monitoring the change curves of the current of the washing air preheater, the smoke temperature of the outlet of the air preheater, the primary air temperature of the outlet of the air preheater, the secondary air temperature and the smoke temperature of the dust removal inlet of the washing side cloth bag in the washing process, and stopping on-line washing once the on-line washing is abnormal, specifically stopping on-line washing of the air preheater when the current of the air preheater is more than 23A or/and the smoke temperature of the outlet of the air preheater is less than 90 ℃ or/and the primary air temperature of the outlet of the air preheater or/and the secondary air temperature of the outlet of the air preheater is less than 120 ℃ or/and the smoke temperature of the dust removal inlet of the washing side cloth bag is less than; secondly, in the washing process, the bag rotating and blowing continuously operates, the differential pressure of the dust removing bag is constantly monitored, and when the differential pressure of the dust removing bag exceeds 1300Pa and does not continuously decrease, the online water washing of the air preheater is stopped; secondly, monitoring a flue gas side pressure difference curve of the air preheater in the washing process, and stopping on-line washing when the pressure difference tends to increase; the induced draft fan and the primary air fan are frequently patrolled and examined in the flushing process, and once an auxiliary machine trips in the operation process, the flushing is stopped immediately, and the processing is carried out according to the tripping of the auxiliary machine.
In the embodiment, the air preheater is continuously and uninterruptedly washed with water in advance until the negative pressure fluctuation amount of the hearth is reduced to minus 100Pa +/-50 Pa, the flue gas side pressure difference of the air preheater is obviously reduced to below 1.6kPa, the washing needs to be carried out uniformly and slowly, and the phenomenon of negative pressure fluctuation of the hearth caused by non-uniform washing of a part of areas is prevented; the flushing water used in the flushing process does not exceed 40 liters/minute, the used flushing water has the temperature of 15 ℃, closed water with slightly high temperature in a workshop can be adopted, condensed water or fire fighting water is not used, the flushing water has high pressure and small flow, if the inlet temperature of a high-pressure flushing water pump is high, cavitation of a pump body can occur, and the fire fighting water with lower temperature can cause the condition that the temperature of outlet smoke is rapidly reduced.
In the step c of this embodiment, the flushing time and the pulling distance of the flushing vehicle are controlled according to the rotating speed of the air preheater and the penetrating power of the high-pressure water gun, the flushing vehicle drives the flushing water gun to move back from inside to outside by 2.5cm each time, the retention time of the innermost flushing position is 5min, the flushing time is increased by 20 times when the flushing vehicle moves back to outside, the change of the pressure difference after flushing is observed, and the flushing time of each region is adjusted.
In this embodiment, the overall structure and system distribution of the air pre-heater all belong to the well-known technologies in the industry, and the structure, the position arrangement of the components, and the like of the air pre-heater are not described herein again. During actual operation, an operation platform with a certain area is erected on one side outside the air preheater needing to be washed, a washing track 100 and a washing vehicle used for erecting a washing water gun 500 are arranged, and a pull rod used for pulling the washing vehicle is arranged, specifically, as shown in fig. 2 and fig. 3, the washing vehicle comprises a bottom frame type base 200, pulleys 210 matched with the washing track 100 are arranged on the periphery of the base 200, stand columns 300 are respectively arranged at four corners of the base 200, a frame type top frame 400 is arranged at the top end of each stand column 300, two clamping frames 410 are arranged in the middle of each top frame 400, the washing water gun 500 is clamped and fixed by the clamping frames 410 on two sides and keeps a vertical state, and vertical face-up washing is achieved. The method comprises the steps that a washing track 100 and a washing vehicle are placed on an operation platform, a pull rod and a washing water gun 500 are arranged on the washing vehicle, a cutting hole is formed below a shell heat transfer element of an air preheater to enable a gun head suitable for washing the water gun 500 to enter and exit, the washing track 100 is installed at a cold end of a smoke side of the air preheater and fixed, it is ensured that the washing water gun 500 can freely advance and retreat, specifically, a guide chain of a chain block used for washing the rear of the track 100 is fixed to an external steel beam, the washing water gun 500 is pushed into the air preheater, the distance between the washing water gun and the central cylinder of the air preheater is 0.3-0.5m, the chain block used for washing the rear is tensioned while the washing water gun 500 is pushed (namely the washing vehicle) to prevent the chain block from inclining forwards to cause imbalance of the track, and after the water gun 500 is in place.
In the flushing process of the embodiment, a specially-assigned person is arranged to be in contact with the operation, and the flushing is stopped immediately once a flushing stopping instruction is received; and after receiving the flushing command which can be recovered from running, the system can continue to work. The whole washing process strictly controls the washing water quantity, the washing time and the like, strictly monitors the washing state, effectively reduces the pressure difference caused by ash blockage of the air preheater, effectively avoids the bag pasting phenomenon of a bag-type dust removal filter bag, is beneficial to reducing the power consumption of a draught fan, improves the load carrying capacity of the boiler, has low requirements on load and environment, shortens the whole operation time, has low cost, and is suitable for popularization and use in a workshop.
Example 2
The online high-pressure water washing method of the rotary air preheater of the full-bag dust removal type coal-fired boiler in the embodiment is basically the same as that in the embodiment 1, except that the opening degree of the movable blade of the induced draft fan at the washing side is reduced by 10% before washing in the step b in the embodiment, the opening degree of the movable blade of the induced draft fan at the other side is increased, and the pressure of a hearth is maintained at-100 Pa; the temperature of the used flushing water is 30 ℃; and c, during flushing, the flushing water gun retreats from inside to outside for 2cm each time, the retention time of the innermost flushing position is 4min, the flushing time is increased by 2.5min after retreating for 15 times, the change of the pressure difference after flushing is observed, and the flushing time of each area is adjusted.
Example 3
The online high-pressure water washing method of the rotary air preheater of the full-bag dust removal type coal-fired boiler in the embodiment is basically the same as that in the embodiment 1, except that the opening degree of the movable blade of the induced draft fan at the washing side is reduced by 6% before washing in the step b in the embodiment, the opening degree of the movable blade of the induced draft fan at the other side is increased, and the pressure of a hearth is maintained at-80 Pa; the temperature of the flushing water used was 20 ℃; and c, when flushing in the step c, the flushing water gun moves back 3cm from inside to outside each time, the retention time of the innermost flushing position is 6min, the flushing time is increased by 2min after moving back 25 times, the pressure difference change after flushing is observed, and the flushing time of each area is adjusted.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (6)
1. The on-line high-pressure water washing method of the rotary air preheater of the full-bag dust removal type coal-fired boiler is characterized by comprising the following steps of: the method comprises the following steps:
a. before washing, stopping blowing dust at the cold end of the smoke side of the air preheater, and keeping the smoke discharge temperature of the washing air preheater to be not less than 120 ℃;
b. checking that the current of the air preheater is normal, and carrying out online water washing work on the air preheater when the unit load is not lower than 200 MW; before flushing in the step b, the opening degree of the movable vane of the draught fan on the flushing side is reduced by 5-10%, the opening degree of the movable vane of the draught fan on the other side is increased, and the pressure of the hearth is maintained at-50 to-100 Pa;
c. the washing vehicle is vertically upward for upward washing, the washing process is gradually performed from the position close to the center of the heat exchange element of the air preheater, and the washing water gun is kept in an upright state and does not collide with surrounding objects in the washing process;
d. monitoring the change curves of the current of the washing air preheater, the exhaust gas temperature at the outlet of the air preheater, the primary air temperature at the outlet of the air preheater, the secondary air temperature and the smoke temperature at the inlet of the bag-type dust collector at the washing side in the washing process, and stopping on-line washing once the abnormality occurs; in the step d, when the current of the air preheater is more than 23A or/and the temperature of the exhaust smoke at the outlet of the air preheater is less than 90 ℃, or/and the temperature of the primary air at the outlet of the air preheater or/and the temperature of the secondary air at the outlet of the air preheater is less than 120 ℃ or/and the temperature of the exhaust smoke at the dust removal inlet of the washing side cloth bag is less than 90 ℃, stopping the online washing of the air preheater; and d, monitoring the pressure difference of the dust removal cloth bag, continuously performing rotary blowing on the dust removal cloth bag, and stopping online water washing of the air preheater when the pressure difference of the dust removal cloth bag exceeds 1300Pa and is not reduced continuously.
2. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler as recited in claim 1, characterized in that: and d, monitoring a flue gas side pressure difference curve of the air preheater, and stopping online washing when the pressure difference tends to increase.
3. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler as recited in any one of claims 1-2, wherein: the temperature of the flushing water used is 15-30 ℃.
4. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler as recited in any one of claims 1-2, wherein: the amount of rinsing water used in the rinsing process does not exceed 40 liters/minute.
5. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler as recited in any one of claims 1-2, wherein: and c, during flushing, the flushing water gun retreats from inside to outside for 2-3cm each time, the retention time of the innermost flushing position is 4-6min, the flushing time is increased by 2-2.5min after retreating for 15-25 times, the change of the pressure difference after flushing is observed, and the flushing time of each area is adjusted.
6. The online high-pressure water washing method for the rotary air preheater of the full-bag dust removal type coal-fired boiler as recited in claim 5, characterized in that: and c, when the water gun is washed in the step c, the water gun is moved back from inside to outside for 2.5cm each time, the retention time of the innermost washing position is 5min, the water gun is moved back for 20 times each time, and the washing time is increased by 2 min.
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| CN205119926U (en) * | 2015-10-13 | 2016-03-30 | 大唐户县第二热电厂 | Online high -pressure water washing device of air heater |
| CN106224989A (en) * | 2016-07-22 | 2016-12-14 | 河北省电力建设调整试验所 | The method of the stifled ash of ammonium hydrogen sulfate in a kind of online removing coal-burning power plant air preheater |
| CN206670446U (en) * | 2017-04-10 | 2017-11-24 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of online water rinse-system of air preheater |
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2018
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| JPH0747233A (en) * | 1993-04-28 | 1995-02-21 | Appar Rothemuehle Brandt & Kritzler Gmbh | Device for reducing nitrogen oxide in combustion exhaust gas |
| CN102042605A (en) * | 2011-01-27 | 2011-05-04 | 章礼道 | Side-to-side thermal deashing method for rotary air preheater |
| CN104180378A (en) * | 2014-07-24 | 2014-12-03 | 国家电网公司 | Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant |
| CN205119926U (en) * | 2015-10-13 | 2016-03-30 | 大唐户县第二热电厂 | Online high -pressure water washing device of air heater |
| CN106224989A (en) * | 2016-07-22 | 2016-12-14 | 河北省电力建设调整试验所 | The method of the stifled ash of ammonium hydrogen sulfate in a kind of online removing coal-burning power plant air preheater |
| CN206670446U (en) * | 2017-04-10 | 2017-11-24 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of online water rinse-system of air preheater |
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| CN109373340A (en) | 2019-02-22 |
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