CN110631871A - Sealed piston type supercharged boiler ash taking device and method - Google Patents
Sealed piston type supercharged boiler ash taking device and method Download PDFInfo
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- G01—MEASURING; TESTING
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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Abstract
The invention discloses an ash taking device and method for a sealed piston type supercharged boiler. Inert gas is filled into the pressure container through the charging valve, so that the internal pressure of the ash taking device before working is equal to the pressure of the flue. The invention has the advantages of good sealing performance, high ash taking efficiency and easy maintenance. The ash taking method can solve the problems of flying ash splashing, ash collection amount reduction, environmental pollution caused by flue gas leakage and the like caused by the pressure difference between the inner side and the outer side of an ash taking point, and can avoid the damage to the flue gas flow field structure in the flue in the ash taking process, thereby realizing the safe and efficient ash taking from the high-pressure flue.
Description
Technical Field
The invention relates to an ash taking device and method, in particular to an ash taking device and method for a sealed piston type supercharged boiler, and belongs to the field of boiler ash taking devices.
Background
The basic pattern of primary energy mainly comprising coal is difficult to change in a short time, and clean and efficient utilization of coal is still an important technical subject of energy transformation development. In a thermal power plant, fly ash is an important component of boiler tail flue gas. The physical and chemical analysis result has great significance for operation regulation and control, cost control, design and reconstruction and environmental protection of the power plant. The pressurized combustion has the advantages of increasing the combustion rate of coal particles, improving the combustion efficiency, reducing the discharge amount of NO pollutants and the like. Both integrated coal gasification combined cycle and pressurized oxyfuel combustion technologies involve pressurized gasification/combustion processes.
Although there are many advantages to increasing the reaction pressure, the pressurization conditions increase the difficulty of ash extraction, placing higher demands on the ash extraction device. In the ash taking process, because of the huge pressure difference between the inner side and the outer side of an ash taking point, an ash sample is often sprayed out along with high-pressure flue gas, so that the ash taking amount is reduced, the ash taking efficiency is reduced, and the environment is polluted. Most of present ash taking devices are suitable for normal pressure boilers and are not suitable for taking ash under the pressurization condition. More importantly, the devices can have great influence on the pressure inside the flue in the ash taking process, so that the flue gas flowing structure inside the flue is damaged. In addition, part of the ash taking devices are used for processing the condition of continuous ash discharge and more ash amount, the system structure is complex, the manufacturing process difficulty is large, the cost is high, and the ash sample collection work cannot be conveniently and rapidly completed in a short time.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a device and a method for safely, efficiently and environmentally taking ash in a high-pressure flue, which aim to solve the problems.
The technical scheme is as follows: the invention discloses an ash taking device of a sealed piston type supercharged boiler, which comprises a pressure container, wherein the upper end of the pressure container is provided with an inlet pipeline, one side of the pressure container is provided with an inflation valve, the other side of the pressure container is provided with a flue gas outlet pipeline, the lower end of the pressure container is provided with an ash outlet pipeline, and a sealed piston is arranged in the pressure container; the sealing piston moves up and down through a regulating piston control part and is used for isolating the collected fly ash.
Preferably, the pressure vessel is divided into a plurality of sections, and each section can be connected by a flange.
When the sealing piston descends to the tail end, the peripheral side of the sealing piston is in sealing fit with the inner wall of the pressure container.
The sealing piston is in a platform shape, a conical shape or a circular truncated cone shape.
And a sample injection valve is arranged on the inlet pipeline.
And the smoke outlet pipeline is provided with an induced draft fan and a smoke outlet valve.
And an ash discharge valve is arranged on the ash outlet pipeline.
And the front part of the ash discharge valve is provided with a rotor, and the rotor is connected with a transmission and a motor. Preferably, the rotor may be a star-shaped rotor.
And a differential pressure gauge is arranged between the flue and the pressure container.
An ash taking method of an ash taking device of a sealed piston type supercharged boiler comprises the following steps:
a. closing all valves, connecting the device inlet pipeline to a flue sampling port, and connecting a flue gas outlet pipeline to a flue sample outlet;
b. opening the charging valve, and charging inert gas into the pressure container until the pressure in the container is the same as the pressure in the flue;
c. closing the gas charging valve, opening valves on the inlet pipeline and the flue gas outlet pipeline, allowing the flue gas carrying the fly ash to enter the pressure container and return to the flue through the flue gas outlet pipeline, and separating the sealing piston from the wall surface;
d. after the collection is finished, closing valves on the inlet pipeline and the flue gas outlet pipeline, and enabling the sealing piston to move downwards through the piston control part until the sealing piston is tightly attached to the wall surface of the pressure vessel;
e. and opening a valve on an ash outlet pipeline to discharge the deposited fly ash.
The step e can be preceded by the following steps:
f. and opening a valve on the flue gas outlet pipeline, and discharging the high-pressure flue gas in the space above the sealing piston out of the pressure container.
g. When the pressure difference between the flue and the pressure container is stable, the valve on the flue gas outlet pipeline is closed, and the sealing piston is moved upwards, so that the high-pressure gas on the lower side of the sealing piston enters the upper side normal pressure space again. The step is used for releasing the high-pressure smoke left at the lower part of the piston.
And c, when the smoke outlet pipeline of the ash taking device is provided with an induced draft fan, closing the induced draft fan while implementing the step b, and opening the induced draft fan while implementing the step c.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the invention conveniently, quickly and reliably realizes the separation of the fly ash and the flue gas and the pressure relief of the flue gas, and effectively prevents the problems of fly ash splashing, ash collection amount reduction and the like caused by overlarge pressure difference between the inner side and the outer side of the ash taking device in the common ash taking device.
(2) The invention can complete the ash extraction process without changing the internal flow structure of the high-pressure flue. Meanwhile, the extracted flue gas returns to the flue again, so that the problem of environmental pollution caused by flue gas leakage is avoided.
(3) The invention can effectively reduce the fly ash residue in the pressure container and improve the fly ash collection rate by filling and discharging the inert gas in the ash taking process.
(4) The rotor provided by the invention can realize the control of the fly ash discharge rate by externally connecting the motor and the speed changer. Meanwhile, the rotor has good sealing performance, and the problem of fly ash leakage caused by pressure difference unbalance under unexpected conditions can be prevented.
(5) The sectional design of the pressure container can effectively simplify the disassembly and assembly process and facilitate the inspection and maintenance of the internal components. Especially, when high-ash high-sulfur low-quality coal is combusted in a boiler, a large amount of fly ash easily causes certain damage to internal parts of the ash taking device, and the convenient and quick disassembly and assembly design is particularly important at the moment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2(a) is a schematic view of the sealing piston of the present invention in a state separated from the wall of the container;
FIG. 2(b) is a schematic view of the sealing piston and the wall of the container in a sealing state according to the present invention;
fig. 3 is a structure view of a sealing piston with different shapes.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the ash extraction device for the sealed piston type supercharged boiler comprises a pressure vessel 2, an inlet pipeline 15, a flue gas outlet pipeline 11 and an ash outlet pipeline 11. The wall surface of the pressure container 2 is provided with an inflation valve 5 and an exhaust valve 6, the other side of the pressure container is provided with a flue gas outlet pipeline 11, the top of the pressure container is provided with an inlet pipeline 15, the bottom of the pressure container is provided with an ash outlet pipeline 16, and a sealing piston 3 is arranged inside the pressure container. This pressure vessel 2 can be divided into the multistage, and flange joint is passed through to every section, conveniently overhauls the device inside. And a sample injection valve 13 is arranged on the inlet pipeline. And the smoke outlet pipeline is provided with an induced draft fan 12 and a smoke outlet valve 13. And an ash discharge valve 10 is arranged on the ash outlet pipeline. A differential pressure gauge 14 is arranged between the flue and the pressure container 2.
The sealing piston 3 can be moved up and down by adjusting the piston control 4 for isolating the collected fly ash. The sealing piston 3 may take different shapes according to the cohesiveness of the sampled ash, and may be a flat type, or a conical or circular truncated cone type, as shown in fig. 3. The platform type piston has the simplest structure and the lightest weight, but ash samples are most easily deposited on the surface; the conical piston has a structure, is complex and has large mass, but has the least accumulated dust; a truncated cone shaped piston is interposed therebetween.
As shown in fig. 2(a), when the sealing piston 3 is separated from the wall surface of the pressure vessel 3, the lower space of the piston communicates with the upper space, and ash falls down to the lower space in the pressure vessel 2 by gravity. When the sealing piston falls to the end, the pressure vessel is divided into two isolated spaces, and ash is pressed in the lower part of the pressure vessel 3 and the ash outlet pipe 11, as shown in fig. 2 (b). And a high-temperature-resistant sealing rubber ring can be arranged on the outer side of the sealing piston 3.
And the upper part of the ash discharge valve is provided with a rotor 9 which is connected with a speed changer 8 and a motor 7, and the rotating speed of the ash discharge valve is adjusted under the action of the speed changer 8 and the motor 7 so as to control the ash discharge speed. The rotor can play a role in blocking the fly ash and play a role in protecting the fly ash leakage problem caused by unbalance of the internal and external pressures of the ash taking device under special conditions. The gap between the outer side of the rotor 9 and the wall surface of the pressure container is smaller than 1mm, the rotor 9 can also be a star-shaped rotor, and the star-shaped rotor has good sealing performance.
Example 1
The ash extraction method of the present invention is described in detail in example 1, and comprises the following steps:
a. all valves (the sample injection valve 1, the gas charging valve 5, the exhaust valve 6, the ash discharge valve 10 and the flue gas outlet valve 13) are closed, the device inlet pipeline 15 is connected to the flue sampling port A, and the flue gas outlet pipeline 11 is connected to the flue sample outlet B.
b. And opening the charging valve 5, and charging inert gas into the pressure container 2 through the charging valve 5 until the pressure in the pressure container 2 is the same as the flue pressure, wherein the number of the differential pressure gauge 14 is 0. The inert gas may also have a pressure. The ash taking device has the same pressure as the flue, and the flow field distribution in the flue cannot be influenced in the ash taking process.
c. The charging valve 5 is closed, the inlet pipeline 15, the valves (the sampling valve 1 and the flue gas outlet valve 13) on the flue gas outlet pipeline 11 and the induced draft fan 12 are opened, the flue gas carrying the fly ash enters the pressure vessel 2 and returns to the flue through the flue gas outlet pipeline 11, at this time, the charging valve 5, the exhaust valve 6 and the ash discharge valve 10 are all in a closed state, and the sealing piston 3 is separated from the wall surface of the pressure vessel 2.
d. After a certain time, when all the inert gases in the pressure vessel 2 and the flue gas outlet pipeline 11 are changed into flue gas, the inlet pipeline, the valves (the sample injection valve 1 and the flue gas outlet valve 13) on the flue gas outlet pipeline 11 and the induced draft fan 12 are closed, the sealing piston 3 is moved downwards through the piston control part 4 until the sealing piston is tightly attached to the wall surface of the pressure vessel, and most fly ash is deposited in the space at the lower side of the sealing piston due to the action of gravity.
e. And opening a flue gas outlet valve 13 and an induced draft fan 12 on the flue gas outlet pipeline 11, and discharging the high-pressure flue gas in the upper side space of the sealing piston 3 out of the pressure container.
f. After the pressure difference between the flue and the pressure container is stable, the flue gas outlet valve 13 and the induced draft fan 12 on the flue gas outlet pipeline 11 are closed, and the sealing piston 3 is moved upwards, so that high-pressure gas on the lower side of the sealing piston enters the upper normal pressure space again, and because the volume of the upper space is far greater than that of the lower space, after the pressure release process is carried out for one time to two times, the inside of the pressure container can be changed into normal pressure, and fly ash still remains in the container and is not carried out by gas.
g. The valve on the ash outlet line 16 is opened and the deposited fly ash is discharged by adjusting the rotation speed of the rotor 9 by means of the speed variator 8 and the motor 7. After the ash is taken out, when the fly ash is left in the pressure container 2, the inflation valve 5, the exhaust valve 6 and the ash discharge valve 10 are opened (other valves are closed), pressurized inert gas can be introduced into the pressure container 2 through the inflation valve 5 to purge the fly ash, and the process is repeated, so that the residual fly ash is discharged through the rotor 9 and the ash discharge valve 10.
Claims (8)
1. The ash taking device for the sealed piston type supercharged boiler is characterized by comprising a pressure container (2), wherein an inlet pipeline (15) is arranged at the upper end of the pressure container (2), an inflation valve (5) is arranged at one side of the pressure container, a flue gas outlet pipeline (11) is arranged at the other side of the pressure container, an ash outlet pipeline (16) is arranged at the lower end of the pressure container, and a sealed piston (3) is arranged inside the pressure container; the sealing piston (3) moves up and down through the adjusting piston control piece (4).
2. The ash extraction device of a sealed piston supercharged boiler according to claim 1, characterized in that the peripheral side of the sealing piston (3) is in sealing abutment with the inner wall of the pressure vessel (2) when it is lowered to the end.
3. The ash extraction device of a sealed piston supercharged boiler according to claim 1, characterized in that the sealing piston (3) is platform-shaped, conical or truncated cone-shaped.
4. The ash extraction device of the sealed piston type supercharged boiler according to claim 1, characterized in that an induced draft fan (12) and a flue gas outlet valve (13) are arranged on the flue gas outlet pipeline (11).
5. The ash extraction device of a sealed piston type supercharged boiler according to claim 1, characterized in that the ash outlet line (16) is provided with a rotor (9) and an ash valve (10), the rotor connecting the transmission (8) and the motor (7).
6. The ash taking method of the ash taking device of the sealed piston type supercharged boiler based on the claim 1 is characterized by comprising the following steps:
a. closing all valves, connecting the device inlet pipeline to a flue sampling port, and connecting a flue gas outlet pipeline to a flue sample outlet;
b. opening the charging valve (5), and charging inert gas into the pressure container (2) until the pressure in the container is the same as the pressure in the flue;
c. closing the charging valve (5), opening valves on the inlet pipeline and the flue gas outlet pipeline, allowing the flue gas carrying the fly ash to enter the pressure container and return to the flue through the flue gas outlet pipeline (11), and separating the sealing piston (3) from the wall surface;
d. after the collection is finished, the valves on the inlet pipeline and the flue gas outlet pipeline are closed, and the sealing piston (3) is moved downwards through the piston control part (4) until the sealing piston is tightly attached to the wall surface of the pressure vessel;
e. and opening a valve on an ash outlet pipeline to discharge the deposited fly ash.
7. The supercharged boiler ash-removing method according to claim 6, wherein said step e is preceded by the steps of:
f. opening a valve on a flue gas outlet pipeline, and discharging high-pressure flue gas in the upper side space of the sealing piston (3) out of the pressure container;
g. and when the pressure difference between the flue and the pressure container is stable, closing the valve on the flue gas outlet pipeline and moving the sealing piston (3) upwards, so that the high-pressure gas on the lower side of the sealing piston (3) enters the upper normal-pressure space again.
8. The supercharged boiler ash taking method according to claim 6, wherein when an induced draft fan (12) is arranged on the flue gas outlet pipeline (11) of the ash taking device, the induced draft fan is turned off while the step b is implemented, and the induced draft fan is turned on while the step c is implemented.
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| CN201910952361.9A CN110631871B (en) | 2019-10-09 | 2019-10-09 | Sealed piston type supercharged boiler ash taking device and method |
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| CN201910952361.9A CN110631871B (en) | 2019-10-09 | 2019-10-09 | Sealed piston type supercharged boiler ash taking device and method |
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| CN110631871B CN110631871B (en) | 2022-04-12 |
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