CN113060557B - Method for improving positive pressure concentrated phase ash conveying system output and optimizing ash conveying operation - Google Patents
Method for improving positive pressure concentrated phase ash conveying system output and optimizing ash conveying operation Download PDFInfo
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- CN113060557B CN113060557B CN202110323876.XA CN202110323876A CN113060557B CN 113060557 B CN113060557 B CN 113060557B CN 202110323876 A CN202110323876 A CN 202110323876A CN 113060557 B CN113060557 B CN 113060557B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
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Abstract
A method for improving the output of a positive-pressure concentrated-phase ash conveying system and optimizing ash conveying operation. In the prior art, the design ash conveying guarantee value of an electric field of the electric dust collector is 55.5 tons per hour, the design output margin is small, and the maximum ash yield of the electric field is 57.5 tons, so that the production requirement cannot be met, and the operation rate and the efficiency of the electric dust collecting electric field are seriously influenced. The invention comprises the following steps: (1) Adjusting the switching sequence of the air inlet valve, the air supply valve and the blowing-assisting valve; (2) Increasing the ash conveying ending pressure value, and increasing the ash conveying ending pressure value from 35KPa to 90KPa; (3) One ash conveying pipeline of DN219 is added to the electric field, and two bin pumps are connected in series to form one ash conveying pipeline; (4) Adjusting the air inflow of the throttle orifice plates of the air inlet valve, the air supply valve and the blowing-assisting valve according to the coal quality and the system output condition; (5) And adjusting the dome valve, wherein the clearance between a sealing ring and a valve core of the dome valve is adjusted to be 0.8-1.4 mm. The invention provides a method for improving the output of a positive-pressure concentrated-phase ash conveying system and optimizing ash conveying operation.
Description
Technical Field
The invention relates to a method for improving the output of a positive pressure concentrated phase ash conveying system and optimizing ash conveying operation.
Background
In the prior art, the design ash conveying guarantee value of an electric field of the electric dust collector is 55.5 tons per hour, the design output margin is small, and the maximum ash yield of the electric field is 57.5 tons, so the production requirement cannot be met. When an electric field ash conveying system is overhauled, the ash conveying system needs to be stopped, an ash bucket is easy to be full of ash to cause electric field short circuit trip, the operation rate and the efficiency of an electric dust removing electric field are seriously influenced, in addition, in recent years, the coal quality is poor, the ash content is large, the ash content is poor, the ash particle size is large, the ash conveying difficulty is caused, the safe operation of a dry ash removing system is seriously influenced, and the operation rate and the efficiency of the electric dust removing electric field are also seriously influenced.
Disclosure of Invention
The invention aims to provide a method for improving the output of a positive-pressure concentrated-phase ash conveying system and optimizing the ash conveying operation, which reduces the abrasion of valves, pipelines and accessories of a dry ash removal system, effectively reduces the maintenance workload, reduces the maintenance cost and improves the commissioning rate and the efficiency of an electric dust removal electric field.
The above purpose is realized by the following technical scheme:
a method for improving the output of a positive pressure dense phase ash conveying system and optimizing the ash conveying operation comprises the following steps:
(1) Adjusting the switching sequence of the air inlet valve, the air supply valve and the blow-assisting valve, wherein the switching sequence is as follows: when ash conveying begins, opening the blowing-assisting valve for 3 seconds, opening the air-supplementing valve for 4 seconds, and then opening the air inlet valve to convey ash; when the ash conveying is finished, closing the blowing-assisting valve, closing the air inlet valve for 4 seconds, and closing the air supplementing valve;
(2) Increasing the ash conveying ending pressure value, increasing the ash conveying ending pressure value from 35KPa to 90KPa, increasing the output of the dry ash removal system by 8 tons per hour, wherein the ash conveying ending pressure value cannot exceed 90KPa at most, otherwise, the dry ash conveying system is easy to block the pipe during operation;
(3) An electric field is additionally provided with an ash conveying pipeline with the diameter of 219mm, two bin pumps are connected in series to form the ash conveying pipeline, the ash conveying period of each time is shortened, the ash conveying times per hour are increased, and the phenomenon of pipe blockage is not easy to occur in the operation process;
(4) According to the coal quality and the system output condition, the air input of the throttle orifice plates of the air inlet valve, the air supply valve and the blowing-assistant valve is adjusted, if the system design output is large and the coal quality is good, the air input of the throttle orifice plates of the air supply valve and the blowing-assistant valve can be reduced, the flow speed is reduced, and the abrasion of a valve, an ash conveying pipeline and accessories of an ash conveying system is reduced;
if the system design has small output margin and poor coal quality, the air input of the throttling orifice plates of the air supply valve and the blowing-assisting valve can be increased, and the ash conveying flow rate is improved;
(5) Adjusting the dome valve, adjusting the clearance between a sealing ring and a valve core of the dome valve to be 0.8-1.4mm, and when the clearance between the sealing ring and the valve core of the dome valve is less than 0.8mm, the valve core and the sealing ring are easy to rub in the running process of the dome valve, so that the sealing ring is damaged or the valve core is clamped with the sealing ring, and the dome valve cannot be closed in place; when the dome valve sealing washer is greater than 1.4mm in the clearance of case, the dome valve is in service the sealing washer not hug tightly the case, leaks in the dome valve takes place easily, leads to case and sealing washer wearing and tearing, shortens dome valve life.
Has the advantages that:
1. the invention provides a method for improving the output of a positive-pressure concentrated-phase ash conveying system and optimizing ash conveying operation, which effectively solves the defects that the design output margin of an electric field of an electric dust collector is small and the production requirement cannot be met.
2. The method is applied to an electric field of a thermal power plant, the ash conveying output is obviously increased, the output per hour is increased by 20 tons, and the problems of poor coal quality, large ash content, poor ash quality and difficult ash conveying of coarse ash particles in recent years are thoroughly solved.
3. The invention can reduce the abrasion of the valve, the pipeline and the accessories of the ash conveying system, properly adjust the air inflow of the air inlet valve, the air supply valve (fluidization valve) and the orifice plate of the blowing-assistant valve according to the coal quality condition and the system output condition of the thermal power plant, properly reduce the air inflow of the air supply valve (fluidization valve) and the orifice plate of the blowing-assistant valve if the system has large output and good coal quality, reduce the flow rate, reduce the abrasion of the valve, the ash conveying pipeline and the accessories of the ash conveying system, and save the maintenance cost by 10 ten thousand yuan every year.
4. According to the invention, an electric field is adopted to increase an ash conveying pipeline with the diameter of 219mm, and two bin pumps are connected in series to form the ash conveying pipeline, so that the phenomenon of pipe blockage in the operation of a dry ash removal system can be effectively prevented.
5. When the dome valve is overhauled, the clearance between the seal ring of the dome valve and the valve core is strictly adjusted, so that the service life of the dome valve can be more than 10000 hours, and when the dome valve is overhauled, the clearance between the seal ring of the dome valve and the valve core is required to be adjusted to be 0.8-1.4mm, so that 15 ten thousand yuan of maintenance cost can be saved every year.
6. The invention can reduce the abrasion of the valve, the pipeline and the accessories of the dry ash conveying system, reduce the maintenance workload, reduce the maintenance cost, effectively prevent the pipe blockage phenomenon in the operation of the dry ash removing system, and effectively improve the output of the dry ash removing system, after the transformation, the ash conveying period is increased from the original 12 times/hour to 21 times/hour, the output of the ash conveying is increased from 55 tons/hour to 73 tons/hour, and the service life of the dome valve is prolonged.
The specific implementation mode is as follows:
example 1:
a method for improving the output of a positive pressure dense phase ash conveying system and optimizing the ash conveying operation comprises the following steps:
(1) The switching sequence of the air inlet valve, the air supply valve and the blowing assisting valve is adjusted, so that the abrasion of a pipeline, a one-way valve and accessories of a fluidization system can be reduced, and the switching sequence is as follows: when ash conveying begins, opening the blowing-assisting valve for 3 seconds, opening the air-supplementing valve for 4 seconds, and then opening the air inlet valve to convey ash; when the ash conveying is finished, closing the blowing-assisting valve, closing the air inlet valve for 4 seconds, and closing the air supplementing valve; the abrasion of the pipeline, the one-way valve and accessories of the fluidization system can be effectively prevented;
(2) Increasing the pressure value of the end of ash conveying, increasing the pressure value of the end of ash conveying from 35KPa to 90KPa, reducing the air blowing time, shortening the ash conveying period, reducing the abrasion of an ash conveying pipeline, increasing the output of a dry ash removal system by 8 tons per hour, and ensuring that the pressure value of the end of ash conveying cannot exceed 90KPa at the highest, otherwise, easily causing pipe blockage in the operation of the dry ash conveying system;
(3) An electric field is added with an ash conveying pipeline with the diameter of 219mm, two bin pumps are connected in series to form the ash conveying pipeline, the ash conveying period of each time is shortened, the ash conveying frequency of each hour is increased, the phenomenon of pipe blockage is not easy to occur in operation, and the ash conveying output is improved;
(4) According to the coal quality and the system output condition, the air input of the throttle orifice plates of the air inlet valve, the air supply valve and the blowing-assistant valve is adjusted, if the system design output is large and the coal quality is good, the air input of the throttle orifice plates of the air supply valve and the blowing-assistant valve can be reduced, the flow speed is reduced, and the abrasion of a valve, an ash conveying pipeline and accessories of an ash conveying system is reduced;
if the system design has small output margin and poor coal quality, the air input of the throttling orifice plates of the air supply valve and the blowing-assisting valve can be increased, and the ash conveying flow rate is improved;
wherein: the throttle orifice plate of the air inlet valve is adjusted in the range of 11-13 holes with the diameter of 5 mm; the pressure of the air inlet valve is adjusted to be 0.25-0.3 mpa;
the throttle orifice plate of the first air supply valve is adjusted within the range of 8-10 holes with the diameter of 5 mm;
the throttle orifice of the blowing-assisting valve is adjusted within the range of 18-24 mm;
(5) Adjusting the dome valve, and adjusting the clearance between a sealing ring and a valve core of the dome valve to be 0.8-1.4mm, wherein if the clearance between the sealing ring and the valve core of the dome valve is less than 0.8mm, the valve core and the sealing ring are easy to rub during the operation of the dome valve, so that the sealing ring is damaged or the valve core clamps the sealing ring to cause that the dome valve is not closed in place, and the safe operation of a dry dedusting system is influenced; if the dome valve sealing washer is greater than 1.4mm in the clearance of case when, the dome valve is in service the sealing washer not hugged closely the case, leaks in the dome valve takes place easily, leads to case and sealing washer wearing and tearing, shortens dome valve life, increases the dry dusting system and stops the operation and overhaul the number of times, also increases the maintenance cost simultaneously, influences the dry dusting system safe operation.
This application is applied to thermal power plant technical field, and the particular case is as follows:
1. the pressure value of the ash conveying end is improved, the ash blowing time is reduced, the ash conveying period is shortened, the abrasion of an ash conveying pipeline is reduced, and the service life of an ash conveying pipe is prolonged;
2. the pipe blockage in the operation of the dry ash removal system can be effectively prevented;
3. the output of the dry ash removal system can be effectively improved;
3.1, improving the pressure value of the end of ash conveying, reducing the air blowing time, shortening the ash conveying period, saving the time by 8 minutes per hour, increasing the ash conveying period by 2 times, conveying 4 tons of ash per period, and increasing 8 tons of output of a dry ash removal system per hour; but the ash conveying pressure value cannot be lower than 90KPa, otherwise, the ash in the ash conveying pipeline is not conveyed cleanly and pipe blockage is easy to occur;
3.2 adding an ash conveying pipeline with the diameter phi of 219mm in an electric field, and connecting two bin pumps in series to form the ash conveying pipeline; the ash conveying period is shortened, the ash conveying times per hour are increased, and the ash conveying output is improved, after an electric field dry ash removal system of No. 3 and No. 4 furnaces (2 x 300 MW) of our factory is modified, the ash conveying period is increased to 21 times per hour from the original 12 times per hour, and the ash conveying output is increased to 73 tons per hour from 55 tons per hour;
4. when the dome valve is overhauled, the clearance between the dome valve sealing ring and the valve core is strictly adjusted, so that the purpose of prolonging the service life of the dome valve is achieved, and the cost is saved by 15 ten thousand yuan each year;
5. reduce the wearing and tearing of dry dusting system valve, pipeline and annex, effectively reduce the maintenance work volume, reduce the maintenance cost, this cost is practiced thrift 10 ten thousand yuan every year.
Claims (1)
1. A method for improving the output of a positive pressure dense phase ash conveying system and optimizing the ash conveying operation is characterized by comprising the following steps: the method comprises the following steps:
(1) Adjusting the switching sequence of the air inlet valve, the air supply valve and the blowing assisting valve, wherein the switching sequence is as follows: when ash conveying begins, opening the blowing-assisting valve for 3 seconds, opening the first air-supply valve for 4 seconds, and then opening the air inlet valve to convey ash; when the ash conveying is finished, the blowing-assisting valve is closed firstly, then the air inlet valve is closed, and after the air inlet valve is closed for 4 seconds, the air replenishing valve is closed;
(2) Increasing the ash conveying ending pressure value, increasing the ash conveying ending pressure value from 35KPa to 90KPa, increasing the output of the dry ash removal system by 8 tons per hour, wherein the ash conveying ending pressure value cannot exceed 90KPa at most, otherwise, the dry ash conveying system is easy to block the pipe during operation;
(3) An electric field is additionally provided with an ash conveying pipeline with the diameter of 219mm, two bin pumps are connected in series to form the ash conveying pipeline, the ash conveying period of each time is shortened, the ash conveying times per hour are increased, and the phenomenon of pipe blockage is not easy to occur in the operation process;
(4) According to the coal quality and the system output condition, the air input of the throttle orifice plates of the air inlet valve, the air supply valve and the blowing-assistant valve is adjusted, if the system design output is large and the coal quality is good, the air input of the throttle orifice plates of the air supply valve and the blowing-assistant valve can be reduced, the flow speed is reduced, and the abrasion of a valve, an ash conveying pipeline and accessories of an ash conveying system is reduced;
if the system design has small output margin and poor coal quality, the air input of the throttling orifice plates of the air supply valve and the blowing-assisting valve can be increased, and the ash conveying flow rate is improved;
(5) Adjusting the dome valve, adjusting the clearance between a sealing ring and a valve core of the dome valve to be 0.8-1.4mm, and when the clearance between the sealing ring and the valve core of the dome valve is less than 0.8mm, the valve core and the sealing ring are easy to rub in the running process of the dome valve, so that the sealing ring is damaged or the valve core is clamped with the sealing ring, and the dome valve cannot be closed in place; when the clearance between the dome valve sealing ring and the valve core is larger than 1.4mm, the dome valve cannot tightly clamp the valve core when in operation, the dome valve is easy to leak inwards, so that the valve core and the sealing ring are abraded, and the service life of the dome valve is shortened;
the throttle orifice plate of the air inlet valve is adjusted in the range of 11-13 holes with the diameter of 5 mm; the pressure of the air inlet valve is adjusted to be 0.25-0.3 mpa; the throttle orifice plate of the first air supply valve is adjusted within the range of 8-10 holes with the diameter of 5 mm; the throttle orifice of the blowing-assisting valve is adjusted within the range of 18-24 mm.
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| CN202110323876.XA CN113060557B (en) | 2021-03-26 | 2021-03-26 | Method for improving positive pressure concentrated phase ash conveying system output and optimizing ash conveying operation |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031439A (en) * | 1983-08-02 | 1985-02-18 | Mitsubishi Heavy Ind Ltd | Open-shut control method for ash intake |
| US5402857A (en) * | 1994-02-17 | 1995-04-04 | Dietzen; Gary H. | Oil and gas well cuttings disposal system |
| CN100395164C (en) * | 2005-04-21 | 2008-06-18 | 南京顺风气力输送系统有限公司 | Large falling head pneumatic material conveying system |
| CN202414800U (en) * | 2012-01-05 | 2012-09-05 | 华能国际电力股份有限公司玉环电厂 | Energy-saving dry ash removing intelligent conveying device of coal-fired power plant |
| CN103604131B (en) * | 2013-11-25 | 2016-01-13 | 镇江市电站辅机厂有限公司 | Suspension type economizer ash-transmission system |
| CN203682609U (en) * | 2014-02-13 | 2014-07-02 | 河北大唐国际丰润热电有限责任公司 | Pneumatic dust delivery device of boiler electric dust precipitation system |
| CN203857473U (en) * | 2014-04-02 | 2014-10-01 | 河北省电力勘测设计研究院 | Ash discharge delivery system of coal economizer |
| CN108840106B (en) * | 2018-05-04 | 2019-11-05 | 太原理工大学 | A kind of visualization long range concentrated phase positive pneumatic transport experimental rig |
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