WO2021087637A1 - Sandblasting ash removal method for heating surface of waste heat boiler in waste incineration power plant - Google Patents
Sandblasting ash removal method for heating surface of waste heat boiler in waste incineration power plant Download PDFInfo
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- WO2021087637A1 WO2021087637A1 PCT/CN2019/115204 CN2019115204W WO2021087637A1 WO 2021087637 A1 WO2021087637 A1 WO 2021087637A1 CN 2019115204 W CN2019115204 W CN 2019115204W WO 2021087637 A1 WO2021087637 A1 WO 2021087637A1
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- sandblasting
- waste heat
- heat boiler
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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
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
Definitions
- the invention relates to a method for cleaning a waste heat boiler, in particular to a method for sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant.
- the present invention proposes a method for sandblasting and ash cleaning on the heating surface of waste heat boilers in waste incineration power plants.
- the process flow includes the following steps: first step: setting up sandblasting machine, second step: personnel in place , Step 3: Work preparation, Step 4: Sandblasting, Step 5: Turn off the sandblasting machine, characterized in that, in Step 4, the sandblasting advances gradually in the direction of the flue gas flow, and at the same time,
- the fourth step it also includes the step of adjusting the negative pressure at the tail of the waste heat boiler to ensure that the smoke and dust flow to the tail of the flue. Further improve the efficiency of dust removal and improve the working environment of the operators, and improve the safety of the operation.
- the technical scheme adopted by the present invention to solve the technical problem is: a method for sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant, including the following steps:
- Step 1 Set up the sandblasting machine
- Step 2 People are in place
- Operators include at least: 2 sandblasting machine operators, 1 monitoring staff, 1 sandblasting operator in the furnace, and 1 slag discharger at the slag conveyor;
- Step 3 Homework preparation
- the sandblasting workers in the furnace enter the furnace wearing sealed protective clothing, holding the sandblasting gun head in their hands, and the slagging personnel are responsible for discharging the ash to the slag pool at the manhole door of the ash bin outside the furnace; monitoring personnel and sandblasting machine operators use The walkie-talkie communicates and informs each other about the operation status;
- Step 4 Sandblasting operation
- the guardian uses the walkie-talkie to contact the operator of the sandblasting machine, start sandblasting, and turn on the air and sand sources;
- Step 5 Turn off the sandblasting machine
- the sandblasting advances gradually according to the direction of the flue gas flow, namely:
- the fourth step it also includes the step of adjusting the negative pressure of the tail flue waste heat boiler, including:
- the monitoring personnel outside the furnace control the fly ash caused by sandblasting by adjusting the negative pressure at the tail of the waste heat boiler.
- the rapid flow into the tail of the waste heat boiler greatly reduces the impact of fly ash on the workers in the furnace. In this step, except for the manhole doors used by the workers in the furnace, all maintenance manhole doors of the waste heat boiler are closed.
- the preferred solution of the present invention is that in the fourth step, when the rotational speed of the induced draft fan is adjusted to 800-1000 r/min, the negative pressure at the rear of the furnace is adjusted to -300Pa to -260Pa.
- the present invention proposes a method of sandblasting and ash cleaning on the heating surface of waste heat boilers in waste incineration power plants, which changes the existing traditional ash cleaning method using manual tools such as prying and shovel to the method of sand blasting and ash cleaning.
- the cleaning efficiency is greatly improved, and the cleaning effect is better, and the surface smoothness of the tube screen is higher.
- the dust can be cleaned from the front and back of the tube panel group, and the dust inside the tube panel can be cleaned without dead corners, and the dust removal effect can reach the tube wall surface area with a dust thickness of not more than 1.5mm; And it can ensure the smooth front and back of the superheater tube panel, and there is no penetrating gray block in the middle of the tube panel.
- the sandblasting is gradually advanced according to the direction of flue gas flow, and by generating negative pressure at the tail of the flue, the flow direction of soot can be effectively controlled and the working environment is improved. , To improve the safety of operations.
- the method of sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant includes the following steps:
- Step 1 Set up the sandblasting machine
- Step 2 People are in place
- Operators include at least: 2 sandblasting machine operators, 1 monitoring staff, 1 sandblasting operator in the furnace, and 1 slag discharger at the slag conveyor;
- Step 3 Homework preparation
- the sandblasting workers in the furnace enter the furnace wearing sealed protective clothing, holding the sandblasting gun head in their hands, and the slagging personnel are responsible for discharging the ash to the slag pool at the manhole door of the ash bin outside the furnace; monitoring personnel and sandblasting machine operators use The walkie-talkie communicates and informs each other about the operation status;
- Step 4 Sandblasting operation
- the guardian uses the walkie-talkie to contact the operator of the sandblasting machine, start sandblasting, and turn on the air and sand sources;
- Step 5 Turn off the sandblasting machine
- the sandblasting advances gradually according to the direction of the flue gas flow, namely:
- the step of adjusting the negative pressure of the tail flue waste heat boiler is also included at the same time, including:
- the monitoring personnel outside the furnace control the fly ash caused by sandblasting by adjusting the negative pressure at the tail of the waste heat boiler.
- the rapid flow into the tail of the waste heat boiler greatly reduces the impact of fly ash on the workers in the furnace. In this step, except for the manhole doors used by the workers in the furnace, all maintenance manhole doors of the waste heat boiler are closed.
- the present invention suggests that in this example, when the rotational speed of the induced draft fan can be adjusted to 800-1000 r/min, the negative pressure at the rear of the furnace can be adjusted to -300Pa to -260Pa.
- the dust removal efficiency is greatly improved, and the ash removal effect is better, and the tube screen surface is smooth. Degree is higher.
- the dust can be cleaned from the front and back of the tube panel group, and the dust inside the tube panel can be cleaned without dead corners, and the dust removal effect can reach the tube wall surface area with a thickness of not more than 1.5mm; And it can ensure the smooth front and back of the superheater tube panel, and there is no penetrating gray block in the middle of the tube panel.
- the sandblasting is gradually advanced according to the direction of flue gas flow, and by generating negative pressure at the tail of the flue, the flow direction of soot can be effectively controlled and the working environment is improved. , Improve the safety of operations.
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- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Abstract
A sandblasting ash removal method for a heating surface of a waste heat boiler in a waste incineration power plant, comprising the following steps: step 1, configure a sandblasting machine; step 2, operators are in place; step 3, operation preparation; step 4, sandblasting operation; step 5, shut down the sandblasting machine. The method is characterized in that: in step 4, sandblasting advances gradually according to a flue gas flow direction, and step 4 further comprises a step of adjusting the negative pressure at the tail of the waste heat boiler to ensure that smoke and dust flow to the tail of a flue. The ash removal efficiency is further improved, the working environment of operators is improved, and the operation safety is enhanced.
Description
本发明涉及一种余热锅炉清理方法，尤其是涉及一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法。The invention relates to a method for cleaning a waste heat boiler, in particular to a method for sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant.
目前，垃圾焚烧发电厂余热锅炉管屏经长周期运行后，余热锅炉受热面积灰、结焦严重，需将管屏上的灰焦清理干净。传统清灰由工人使用撬、铲等工具进行手动清灰。清灰效率低、质量差。并且，受作业空间及管屏结构的影响，不能对受热面管屏进行全面清灰，且工作环境温度高、炉内灰尘极大，工作周期长，需要5-6人同时进入炉内工作，工人的劳动强度大、作业环境恶劣。At present, after long-period operation of waste heat boiler tube panels in waste incineration power plants, the heating area of the waste heat boiler is seriously ash and coking, and the ash and coke on the tube panels need to be cleaned up. In traditional dust removal, workers use prying, shovel and other tools to manually remove dust. The cleaning efficiency is low and the quality is poor. In addition, due to the influence of the working space and the structure of the tube panel, the tube panel of the heating surface cannot be completely cleaned, and the working environment temperature is high, the dust in the furnace is extremely large, and the working cycle is long. It requires 5-6 people to enter the furnace at the same time to work. The labor intensity of workers is high and the working environment is harsh.
发明内容Summary of the invention
为了解决现有技术问题，本发明提出了一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法，其工艺流程包括以下步骤：第1步骤：设置喷砂机，第2步骤：人员就位，第3步骤：作业准备，第4步骤：喷砂作业，第5步骤：关闭喷砂机，其特征是，在第4步骤中，喷砂按照烟气流动的方向逐步向前推进，同时，在第4步骤中，还包括调整余热锅炉尾部负压的步骤，确保烟尘往烟道尾部流动。进一步提高清灰效率并且改善作业人员的工作环境，提高作业的安全性。In order to solve the existing technical problems, the present invention proposes a method for sandblasting and ash cleaning on the heating surface of waste heat boilers in waste incineration power plants. The process flow includes the following steps: first step: setting up sandblasting machine, second step: personnel in place , Step 3: Work preparation, Step 4: Sandblasting, Step 5: Turn off the sandblasting machine, characterized in that, in Step 4, the sandblasting advances gradually in the direction of the flue gas flow, and at the same time, In the fourth step, it also includes the step of adjusting the negative pressure at the tail of the waste heat boiler to ensure that the smoke and dust flow to the tail of the flue. Further improve the efficiency of dust removal and improve the working environment of the operators, and improve the safety of the operation.
本发明解决技术问题所采用的技术方案是：一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法，包括以下步骤：The technical scheme adopted by the present invention to solve the technical problem is: a method for sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant, including the following steps:
第1步骤：设置喷砂机，Step 1: Set up the sandblasting machine,
将喷砂机放置在余热锅炉顶部，并将喷砂机进气管道与厂用空压机连接在一起；将喷砂机出口管道进行组装安装，并将喷砂枪头端提前放置在炉内；将石英砂事先摆放在余热锅炉炉顶平台；向喷砂机内加注石英砂；Place the sand blasting machine on the top of the waste heat boiler, and connect the inlet pipe of the sand blasting machine with the factory air compressor; assemble and install the outlet pipe of the sand blasting machine, and place the head of the sand blasting gun in the furnace in advance ; Place the quartz sand on the top platform of the waste heat boiler in advance; fill the sandblasting machine with quartz sand;
第2步骤：人员就位，Step 2: People are in place,
作业人员至少包括：2名喷砂机操作人员，1名监护人员，1名炉内喷砂作业人员，1名在输渣机处排渣人员；Operators include at least: 2 sandblasting machine operators, 1 monitoring staff, 1 sandblasting operator in the furnace, and 1 slag discharger at the slag conveyor;
第3步骤：作业准备，Step 3: Homework preparation,
炉内喷砂作业人员穿戴密封防护服进入炉内，手中握着喷砂枪头，排渣人员负责在炉外灰仓人孔门处排灰至渣池；监护人员与喷砂机操作人员采用对讲机进行联系，相互通告作业情况；The sandblasting workers in the furnace enter the furnace wearing sealed protective clothing, holding the sandblasting gun head in their hands, and the slagging personnel are responsible for discharging the ash to the slag pool at the manhole door of the ash bin outside the furnace; monitoring personnel and sandblasting machine operators use The walkie-talkie communicates and informs each other about the operation status;
第4步骤：喷砂作业，Step 4: Sandblasting operation,
监护人员用对讲机与喷砂机操作人员联系，开始进行喷砂，打开气源、沙源；The guardian uses the walkie-talkie to contact the operator of the sandblasting machine, start sandblasting, and turn on the air and sand sources;
第5步骤：关闭喷砂机，Step 5: Turn off the sandblasting machine,
当喷砂作业结束时，关闭喷砂机气源、沙源，炉内作业人员从炉内出来，收拾作业现场，将喷砂管 等设备收放至余热锅炉炉顶平台；When the sandblasting operation is over, shut off the air source and sand source of the sandblasting machine, and the workers in the furnace come out of the furnace, clean up the work site, and retract the sandblasting pipe and other equipment to the top platform of the waste heat boiler;
其特征是，Its characteristic is,
在第4步骤中，喷砂按照烟气流动的方向逐步向前推进，即:In the fourth step, the sandblasting advances gradually according to the direction of the flue gas flow, namely:
一级蒸发器→三级过热器→二级过热器→一级过热器→二级蒸发器→二级省煤器→一级省煤器；One-stage evaporator→three-stage superheater→two-stage superheater→first-stage superheater→two-stage evaporator→two-stage economizer→first-stage economizer;
在第4步骤中，还同时包括调整尾部烟道余热锅炉负压的步骤，包括：In the fourth step, it also includes the step of adjusting the negative pressure of the tail flue waste heat boiler, including:
炉外监护人员通过调整余热锅炉尾部负压对喷砂引起的飞灰进行控制，同时根据余热锅炉尾部负压测点及引风机转速，调整余热锅炉内部烟气流速，使产生的飞灰以较快的速度流入余热锅炉尾部，大大降低了飞灰对炉内作业人员的影响，在此步骤中，除炉内作业人员用人孔门外，余热锅炉各检修人孔门均处于关闭状态。The monitoring personnel outside the furnace control the fly ash caused by sandblasting by adjusting the negative pressure at the tail of the waste heat boiler. At the same time, adjust the flue gas flow rate inside the waste heat boiler according to the negative pressure measurement point at the tail of the waste heat boiler and the speed of the induced draft fan, so that the generated fly ash can be compared with The rapid flow into the tail of the waste heat boiler greatly reduces the impact of fly ash on the workers in the furnace. In this step, except for the manhole doors used by the workers in the furnace, all maintenance manhole doors of the waste heat boiler are closed.
本发明优选方案是，在第4步骤中，引风机转速调整为800～1000r/min时，炉膛尾部负压调整为-300Pa～-260Pa。The preferred solution of the present invention is that in the fourth step, when the rotational speed of the induced draft fan is adjusted to 800-1000 r/min, the negative pressure at the rear of the furnace is adjusted to -300Pa to -260Pa.
本发明的有益效果是：本发明提出一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法，将现有传统清灰采用人工使用撬、铲等工具改变为采用喷砂清灰的方法，使清灰效率得到极大的提高、并且清灰效果更好、管屏表面光滑度更高。采用喷砂清灰方法之后，可以从管屏组前、后进行清灰，可以对管屏内部的积灰可进行无死角的清理，清灰效果可达到管壁表面积灰厚度不超过1.5mm；并且可以确保过热器管屏前后通畅，管屏中间部位无贯通性灰块。同时，由于喷砂本身具有可控的方向性，喷砂时按照烟气流动的方向逐步向前推进，并且通过使烟道尾部产生负压，可以有效地控制烟尘的流动方向，改善了作业环境，提高作业的安全性。The beneficial effects of the present invention are: the present invention proposes a method of sandblasting and ash cleaning on the heating surface of waste heat boilers in waste incineration power plants, which changes the existing traditional ash cleaning method using manual tools such as prying and shovel to the method of sand blasting and ash cleaning. The cleaning efficiency is greatly improved, and the cleaning effect is better, and the surface smoothness of the tube screen is higher. After the sandblasting method is adopted, the dust can be cleaned from the front and back of the tube panel group, and the dust inside the tube panel can be cleaned without dead corners, and the dust removal effect can reach the tube wall surface area with a dust thickness of not more than 1.5mm; And it can ensure the smooth front and back of the superheater tube panel, and there is no penetrating gray block in the middle of the tube panel. At the same time, due to the controllable directionality of sandblasting, the sandblasting is gradually advanced according to the direction of flue gas flow, and by generating negative pressure at the tail of the flue, the flow direction of soot can be effectively controlled and the working environment is improved. , To improve the safety of operations.
本发明提出的一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法包括以下步骤：The method of sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant provided by the present invention includes the following steps:
第1步骤：设置喷砂机，Step 1: Set up the sandblasting machine,
将喷砂机放置在余热锅炉顶部，并将喷砂机进气管道与厂用空压机连接在一起；将喷砂机出口管道进行组装安装，并将喷砂枪头端提前放置在炉内；将石英砂事先摆放在余热锅炉炉顶平台；向喷砂机内加注石英砂；Place the sand blasting machine on the top of the waste heat boiler, and connect the inlet pipe of the sand blasting machine with the factory air compressor; assemble and install the outlet pipe of the sand blasting machine, and place the head of the sand blasting gun in the furnace in advance ; Place the quartz sand on the top platform of the waste heat boiler in advance; fill the sandblasting machine with quartz sand;
第2步骤：人员就位，Step 2: People are in place,
作业人员至少包括：2名喷砂机操作人员，1名监护人员，1名炉内喷砂作业人员，1名在输渣机处排渣人员；Operators include at least: 2 sandblasting machine operators, 1 monitoring staff, 1 sandblasting operator in the furnace, and 1 slag discharger at the slag conveyor;
第3步骤：作业准备，Step 3: Homework preparation,
炉内喷砂作业人员穿戴密封防护服进入炉内，手中握着喷砂枪头，排渣人员负责在炉外灰仓人孔门处排灰至渣池；监护人员与喷砂机操作人员采用对讲机进行联系，相互通告作业情况；The sandblasting workers in the furnace enter the furnace wearing sealed protective clothing, holding the sandblasting gun head in their hands, and the slagging personnel are responsible for discharging the ash to the slag pool at the manhole door of the ash bin outside the furnace; monitoring personnel and sandblasting machine operators use The walkie-talkie communicates and informs each other about the operation status;
第4步骤：喷砂作业，Step 4: Sandblasting operation,
监护人员用对讲机与喷砂机操作人员联系，开始进行喷砂，打开气源、沙源；The guardian uses the walkie-talkie to contact the operator of the sandblasting machine, start sandblasting, and turn on the air and sand sources;
第5步骤：关闭喷砂机，Step 5: Turn off the sandblasting machine,
当喷砂作业结束时，关闭喷砂机气源、沙源，炉内作业人员从炉内出来，收拾作业现场，将喷砂管等设备收放至余热锅炉炉顶平台。When the sand blasting operation is over, shut off the air source and sand source of the sand blasting machine, and the workers in the furnace come out of the furnace, clean up the work site, and retract the sand blasting pipe and other equipment to the top platform of the waste heat boiler.
其特征是，Its characteristic is,
在第4步骤中，喷砂按照烟气流动的方向逐步向前推进，即:In the fourth step, the sandblasting advances gradually according to the direction of the flue gas flow, namely:
一级蒸发器→三级过热器→二级过热器→一级过热器→二级蒸发器→二级省煤器→一级省煤器；One-stage evaporator→three-stage superheater→two-stage superheater→first-stage superheater→two-stage evaporator→two-stage economizer→first-stage economizer;
在第4步骤中，还同时包括调整尾部烟道余热锅炉负压的步骤，包括：In the fourth step, the step of adjusting the negative pressure of the tail flue waste heat boiler is also included at the same time, including:
炉外监护人员通过调整余热锅炉尾部负压对喷砂引起的飞灰进行控制，同时根据余热锅炉尾部负压测点及引风机转速，调整余热锅炉内部烟气流速，使产生的飞灰以较快的速度流入余热锅炉尾部，大大降低了飞灰对炉内作业人员的影响，在此步骤中，除炉内作业人员用人孔门外，余热锅炉各检修人孔门均处于关闭状态。The monitoring personnel outside the furnace control the fly ash caused by sandblasting by adjusting the negative pressure at the tail of the waste heat boiler. At the same time, adjust the flue gas flow rate inside the waste heat boiler according to the negative pressure measurement point at the tail of the waste heat boiler and the speed of the induced draft fan, so that the generated fly ash can be compared with The rapid flow into the tail of the waste heat boiler greatly reduces the impact of fly ash on the workers in the furnace. In this step, except for the manhole doors used by the workers in the furnace, all maintenance manhole doors of the waste heat boiler are closed.
本发明提示，本例中，引风机转速可以调整为800～1000r/min时，炉膛尾部负压可以调整为-300Pa～-260Pa。The present invention suggests that in this example, when the rotational speed of the induced draft fan can be adjusted to 800-1000 r/min, the negative pressure at the rear of the furnace can be adjusted to -300Pa to -260Pa.
本例中，由于将现有传统清灰采用人工使用撬、铲等工具改变为采用喷砂清灰的方法，使清灰效率得到极大的提高、并且清灰效果更好、管屏表面光滑度更高。采用喷砂清灰方法之后，可以从管屏组前、后进行清灰，可以对管屏内部的积灰可进行无死角的清理，清灰效果可达到管壁表面积灰厚度不超过1.5mm；并且可以确保过热器管屏前后通畅，管屏中间部位无贯通性灰块。同时，由于喷砂本身具有可控的方向性，喷砂时按照烟气流动的方向逐步向前推进，并且通过使烟道尾部产生负压，可以有效地控制烟尘的流动方向，改善了作业环境，提高作业的安全性。In this example, because the existing traditional ash removal using manual tools such as prying, shovel, etc. is changed to the sandblasting method, the ash removal efficiency is greatly improved, and the ash removal effect is better, and the tube screen surface is smooth. Degree is higher. After the sandblasting method is used, the dust can be cleaned from the front and back of the tube panel group, and the dust inside the tube panel can be cleaned without dead corners, and the dust removal effect can reach the tube wall surface area with a thickness of not more than 1.5mm; And it can ensure the smooth front and back of the superheater tube panel, and there is no penetrating gray block in the middle of the tube panel. At the same time, due to the controllable directionality of sandblasting, the sandblasting is gradually advanced according to the direction of flue gas flow, and by generating negative pressure at the tail of the flue, the flow direction of soot can be effectively controlled and the working environment is improved. , Improve the safety of operations.
Claims (2)
- 一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法，包括以下步骤：A method for sandblasting and dust removal on the heating surface of a waste heat boiler in a waste incineration power plant includes the following steps:第1步骤：设置喷砂机，Step 1: Set up the sandblasting machine,将喷砂机放置在余热锅炉顶部，并将喷砂机进气管道与厂用空压机连接在一起；将喷砂机出口管道进行组装安装，并将喷砂枪头端提前放置在炉内；将石英砂事先摆放在余热锅炉炉顶平台；向喷砂机内加注石英砂；Place the sand blasting machine on the top of the waste heat boiler, and connect the inlet pipe of the sand blasting machine with the factory air compressor; assemble and install the outlet pipe of the sand blasting machine, and place the head of the sand blasting gun in the furnace in advance ; Place the quartz sand on the top platform of the waste heat boiler in advance; fill the sandblasting machine with quartz sand;第2步骤：人员就位，Step 2: People are in place,作业人员至少包括：2名喷砂机操作人员，1名监护人员，1名炉内喷砂作业人员，1名在输渣机处排渣人员；Operators include at least: 2 sandblasting machine operators, 1 monitoring staff, 1 sandblasting operator in the furnace, and 1 slag discharger at the slag conveyor;第3步骤：作业准备，Step 3: Homework preparation,炉内喷砂作业人员穿戴密封防护服进入炉内，手中握着喷砂枪头，排渣人员负责在炉外灰仓人孔门处排灰至渣池；监护人员与喷砂机操作人员采用对讲机进行联系，相互通告作业情况；The sandblasting workers in the furnace enter the furnace wearing sealed protective clothing, holding the sandblasting gun head in their hands, and the slagging personnel are responsible for discharging the ash to the slag pool at the manhole door of the ash bin outside the furnace; monitoring personnel and sandblasting machine operators use The walkie-talkie communicates and informs each other about the operation situation;第4步骤：喷砂作业，Step 4: Sandblasting operation,监护人员用对讲机与喷砂机操作人员联系，开始进行喷砂，打开气源、沙源；The guardian uses the walkie-talkie to contact the operator of the sandblasting machine, start sandblasting, and turn on the air and sand sources;第5步骤：关闭喷砂机，Step 5: Turn off the sandblasting machine,当喷砂作业结束时，关闭喷砂机气源、沙源，炉内作业人员从炉内出来，收拾作业现场，将喷砂管等设备收放至余热锅炉炉顶平台；When the sand blasting operation is over, shut off the air source and sand source of the sand blasting machine, and the workers in the furnace come out of the furnace, clean up the work site, and retract the sand blasting pipe and other equipment to the top platform of the waste heat boiler;其特征是，Its characteristic is,在第4步骤中，喷砂按照烟气流动的方向逐步向前推进，即:In the fourth step, the sandblasting advances gradually according to the direction of the flue gas flow, namely:一级蒸发器→三级过热器→二级过热器→一级过热器→二级蒸发器→二级省煤器→一级省煤器；One-stage evaporator→three-stage superheater→two-stage superheater→first-stage superheater→two-stage evaporator→two-stage economizer→first-stage economizer;在第4步骤中，还同时包括调整尾部烟道余热锅炉负压的步骤，包括：In the fourth step, it also includes the step of adjusting the negative pressure of the tail flue waste heat boiler, including:炉外监护人员通过调整余热锅炉尾部负压对喷砂引起的飞灰进行控制，同时根据余热锅炉尾部负压测点及引风机转速，调整余热锅炉内部烟气流速，使产生的飞灰以较快的速度流入余热锅炉尾部，大大降低了飞灰对炉内作业人员的影响，在此步骤中，除炉内作业人员用人孔门外，余热锅炉各检修人孔门均处于关闭状态。The monitoring personnel outside the furnace control the fly ash caused by sandblasting by adjusting the negative pressure at the tail of the waste heat boiler. At the same time, adjust the flue gas flow rate inside the waste heat boiler according to the negative pressure measurement point at the tail of the waste heat boiler and the speed of the induced draft fan, so that the generated fly ash can be compared with The rapid flow into the tail of the waste heat boiler greatly reduces the impact of fly ash on the workers in the furnace. In this step, except for the manhole doors used by the workers in the furnace, all maintenance manhole doors of the waste heat boiler are closed.
- 根据权利要求1所述的一种垃圾焚烧发电厂余热锅炉受热面喷砂清灰方法，其特征是，在第4步骤中，引风机转速调整为800～1000r/min时，炉膛尾部负压调整为-300Pa～-260Pa。The method for sandblasting and ash cleaning on the heating surface of a waste heat boiler in a waste incineration power plant according to claim 1, characterized in that, in the fourth step, when the speed of the induced draft fan is adjusted to 800~1000r/min, the negative pressure at the rear of the furnace is adjusted It is -300Pa～-260Pa.
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