CN111720844A - Granulating water system and method based on liquid slag discharging boiler of large coal-fired power plant - Google Patents
Granulating water system and method based on liquid slag discharging boiler of large coal-fired power plant Download PDFInfo
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- CN111720844A CN111720844A CN202010518428.0A CN202010518428A CN111720844A CN 111720844 A CN111720844 A CN 111720844A CN 202010518428 A CN202010518428 A CN 202010518428A CN 111720844 A CN111720844 A CN 111720844A
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- granulating
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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
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/08—Liquid slag removal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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Abstract
The invention discloses a granulating water system and a method based on a large coal-fired power plant slag tapping boiler, which comprises a granulating water tank and a torrent granulating water tank, wherein the torrent granulating water tank is connected with a granulating water source pipe, the torrent granulating water tank is connected with a granulating water source branch pipe, one end of the granulating water source branch pipe is connected with the granulating water source pipe, a torrent granulating water pump is serially arranged at a position, close to the position between the granulating water source branch pipe and the torrent granulating water tank, the granulating water pump is serially arranged at a position, close to the position between the granulating water source pipe and the granulating water tank, on the granulating water source branch pipe, and a plurality of granulating water nozzles which are parallelly arranged are arranged at the bottom of the side wall. The invention solves the scum problem of the slag tapping boiler of the large coal-fired power plant, which is possibly caused by incomplete combustion or the viscosity-temperature characteristic change of slag liquid and the like, prevents the slag hopper from being blocked due to the scum problem and ensures the safe and temperature operation of the unit.
Description
Technical Field
The invention relates to the technical field of slag tapping boilers of coal-fired power plants, in particular to a granulating water system and a granulating method based on a slag tapping boiler of a large-scale coal-fired power plant.
Background
The slag tapping boiler of the large coal-fired power plant melts the ash into a fluid state by utilizing higher hearth temperature, and catches the ash in the flue gas through the slag catching screen, so that most of the ash forms molten slag liquid and falls into a slag pool through a slag flowing port at the bottom of the furnace, thereby achieving the purpose of reducing the volume and the weight of the ash. However, due to the slag tapping characteristic of the slag tapping boiler, when high-temperature slag liquid enters the slag bath, scum is easily formed on the water surface of the slag bath along with the cooling of the slag liquid and the vaporization of cooling water of the slag bath, and when the scum is slowly accumulated to prevent the slag liquid from smoothly falling into the slag bath and finally blocking a slag hopper, the safe operation of the boiler can be seriously influenced, so that the granulating water system and the granulating method based on the slag tapping boiler of the large-scale coal-fired power plant are provided.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a granulating water system and a method based on a slag tapping boiler of a large coal-fired power plant.
The invention provides a granulating water system based on a slag tapping boiler of a large coal-fired power plant, which comprises a granulating water tank and a torrent granulating water tank, wherein the torrent granulating water tank is connected with a granulating water source pipe, the torrent granulating water tank is connected with a granulating water source branch pipe, one end of the granulating water source branch pipe is connected with the granulating water source pipe, a torrent granulating water pump is connected in series at a position, close to the position between the granulating water source branch pipe and the torrent granulating water tank, on the granulating water source branch pipe, a granulating water pump is connected in series at a position, close to the position between the granulating water source pipe and the granulating water tank, the bottom of the side wall of the granulating water tank is provided with a plurality of granulating water nozzles arranged in parallel, and the bottom of the side wall of the torrent granulating water.
An operation method of a granulating water system based on a slag tapping boiler of a large coal-fired power plant comprises the following steps: the granulation water is pumped into a granulation water tank and a torrent granulation water tank from a granulation water source pipe through a granulation water pump and a torrent granulation water pump, and is pressurized and sent into a granulation water nozzle and a torrent granulation water nozzle, the pressurized granulation water forms granulation water flow through the granulation water nozzle to be sprayed out and is torrently sprayed on the surface of high-temperature slag liquid, so that the high-temperature slag liquid is rapidly quenched to form a vitreous body, meanwhile, the internal stress is rapidly increased, so that slag blocks are crushed to form vitreous body slag particles which fall into a slag bath, and the torrent granulation water is obliquely downwards sprayed out from the position close to the water surface of the slag bath at an inclination angle of degree, and forms torrent in the slag.
Preferably, the granulated water flow is a mesh-shaped granulated water flow and covers a high-temperature slag liquid falling position.
The beneficial effects of the invention are as follows:
1. by utilizing the principle that the internal stress of high-temperature molten slag liquid can be rapidly increased to cause slag blocks to be broken to form vitreous slag particles when the high-temperature molten slag liquid is quenched to form vitreous bodies, the slag bucket of the large coal-fired power station liquid slag discharging boiler is provided with the granulating water system, and the high-temperature slag liquid is cooled and impacted by pressurized granulating water flow, so that the slag liquid is quenched and granulated into vitreous particles to be difficult to form floating slag, and the problem of the floating slag existing on the large coal-fired power station liquid slag discharging boiler all the time is solved.
2. The problem of scum that large-scale coal fired power plant slag tapping boiler probably caused because of reasons such as incomplete combustion or the change of slag-liquid viscosity temperature characteristic is solved, prevented to appear because of the condition that the scum problem leads to the jam of slag bucket, guaranteed the safety of unit, temperature operation, also eliminated the safe risk in the clearance stifled sediment simultaneously, the vitreous body slag grain bulk density through granulating is higher than general lime-ash simultaneously, has also realized the target of power plant solid waste volume reduction decrement.
Drawings
FIG. 1 is a schematic diagram of the installation of a granulated water system based on a slag tapping boiler of a large-scale coal-fired power plant according to the present invention.
FIG. 2 is a schematic diagram of a water granulation system based on a slagging tap boiler of a large coal-fired power plant according to the present invention.
In the figure: the slag tapping system comprises a slag tapping boiler 1, a combustor 2, a slag tapping port 3, a granulation water nozzle 4, a torrent granulation water nozzle 5, a granulation water pump 6, a granulation water tank 7, a torrent granulation water dividing pump 8, a torrent granulation water tank 9, a granulation water source pipe 10, a slag pool 11 and a slag dragging machine 12.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a granulating water system based on a slag tapping boiler of a large-scale coal-fired power plant comprises a granulating water tank 7 and a torrent granulating water tank 9, wherein the torrent granulating water tank 9 is connected with a granulating water source pipe 10, the torrent granulating water tank 9 is connected with a granulating water source branch pipe, one end of the granulating water source branch pipe is connected with the granulating water source pipe 10, a torrent granulating water pump 8 is serially arranged at a position, close to the position between the granulating water source branch pipe and the torrent granulating water tank 9, on the granulating water source branch pipe, a granulating water pump 6 is serially arranged at a position, close to the position between the granulating water source pipe 10 and the granulating water tank 7, a plurality of granulating water nozzles 4 arranged in parallel are arranged at the bottom of the side wall of the granulating water tank 7, and a plurality of torrent granulating water nozzles 5.
An operation method of a granulating water system based on a slag tapping boiler of a large coal-fired power plant comprises the following steps: the granulation water is pumped into a granulation water tank 7 and a torrent granulation water tank 9 from a granulation water source pipe 10 through a granulation water pump 6 and a torrent granulation water pump 8, and is pressurized and sent into a granulation water nozzle 4 and a torrent granulation water nozzle 5, the pressurized granulation water forms granulation water flow through the granulation water nozzle 4 to be sprayed out and is shot on the surface of high-temperature slag liquid, the high-temperature slag liquid is quenched to form a vitreous body, meanwhile, the internal stress is rapidly increased, so that slag blocks are crushed to form vitreous body slag particles which fall into a slag pool 11, and the torrent granulation water is shot obliquely downwards from the position close to the water surface of the slag pool 11 at an inclination angle of 30 degrees to form torrent in the slag pool 11.
In the invention, the temperature of the used granulating water source is kept at about 45 ℃, the lower granulating water temperature can better realize the effect of granulating the high-temperature slag liquid, a cooling tower can be arranged on the granulating water source to ensure the temperature of the granulating water source, the pressure provided by the granulating water pump 6 and the torrent granulating water pump 8 can be determined according to the required outlet speed of the granulating water flow, the granulating water pump ensures that the granulating water flow keeps certain flow velocity and pressure, the granulating water flow can cover the high-temperature slag liquid, and the granulating water flow also has certain kinetic energy to ensure that the slag liquid is impacted by the water flow in the process of quenching and granulating to accelerate the granulating.
The slag system consists of a slag tapping boiler 1, a combustor 2 and a slag tapping hole 3, the system converges high-temperature slag liquid generated by the slag tapping boiler 1 during power generation and heat supply at the bottom of a furnace and then flows out of the slag tapping hole to fall into a slag hopper, coal powder airflow enters the slag tapping boiler 1 through the combustor 2, the coal powder airflow is vigorously combusted to form high-temperature slag liquid which is gathered near the slag tapping hole 3 at the bottom of the furnace and flows out of the slag tapping hole 3, a granulating water pipeline connects a granulating water source pipe 10 with a granulating water tank 7 and a torrent granulating water tank 9, granulating water is pumped to the granulating water tank 7 and the torrent granulating water tank 9 from the granulating water source pipe 10 through a granulating water pump 6 and a torrent granulating water pump 8 and is pressurized to be sent to a granulating water nozzle 4 and a torrent granulating water nozzle 5, the pressurized granulating water forms granulating water flow which is sprayed out through the granulating water nozzle 4 and is blasted on the surface of the, meanwhile, the internal stress can be rapidly lifted to cause the slag block to be broken, so that vitreous slag particles are finally formed and fall into a slag pool 11, and are finally conveyed to a transfer station by a slag dragging machine 12 to be processed by the transfer station, the torrent granulating water is obliquely ejected downwards at an inclination angle of 30 degrees near the water surface of the slag pool 11 through a torrent granulating water nozzle 5 to form torrent in the slag pool 11, on one hand, the cooling of the slag liquid is accelerated through the rapid flowing of the pool water to enable the high-temperature slag liquid to be more easily granulated to form vitreous particles, on the other hand, the obliquely downward torrent granulating water can form water flow impacting towards the rear part of the slag bucket in the slag pool 11 to flush the scum blocks in the pool from the rear part of the slag bucket, so as to avoid the scum from being accumulated and blocked in the slag bucket, the granulating nozzle water 4 is selected at the position below the slag bucket but not too close to the slag pool, so as to prevent the slag water wave impact of the slag pool from causing the slag nozzle to accumulate and block, the granulating water nozzle, because the high-temperature slag liquid may be disturbed or solidified for a short time when flowing down from the slag flowing port 3, and the flowing position of the slag liquid is changed, the mesh-shaped granulating water flow can effectively cover the falling point of the high-temperature slag liquid, the adaptability of the granulating water system is improved, the granulating water flow sprayed into the slag hopper is ensured to be within the allowable range of slag pool overflow, the slag pool overflow is too large due to the too large granulating water amount, and the slag water in the slag pool is difficult to discharge in time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A granulating water system based on a slag tapping boiler of a large coal-fired power plant comprises a granulating water tank (7) and a torrent granulating water tank (9), it is characterized in that the torrent granulation water tank (9) is connected with a granulation water source pipe (10), the torrent granulation water tank (9) is connected with a granulation water source branch pipe, one end of the granulating water source branch pipe is connected with a granulating water source pipe (10), a torrent granulating water pump (8) is arranged in series at the position of the granulating water source pipe (10) close to the position between the granulating water source branch pipe and the torrent granulating water tank (9), a granulation water pump (6) is connected in series on the granulation water source branch pipe at a position close to the position between the granulation water source pipe (10) and the granulation water tank (7), a plurality of granulating water nozzles (4) arranged in parallel are arranged at the bottom of the side wall of the granulating water tank (7), a plurality of torrent granulating water nozzles (5) which are arranged in parallel are arranged at the bottom of the side wall of the torrent granulating water tank (9).
2. The method of claim 1, comprising the steps of: the granulation water is pumped into a granulation water tank (7) and a torrent granulation water tank (9) through a granulation water pump (6) and a torrent granulation water pump (8) from a granulation water source pipe (10), and is pressurized and sent into a granulation water nozzle (4) and a torrent granulation water nozzle (5), the pressurized granulation water forms granulation water flow through the granulation water nozzle (4) and is sprayed on the surface of high-temperature slag liquid, the high-temperature slag liquid is quenched to form a vitreous body, meanwhile, the internal stress is rapidly increased, so that slag blocks are crushed to form vitreous slag particles which fall into a slag pool (11), and the torrent granulation water is obliquely sprayed out from the position close to the water surface of the slag pool (11) at an inclination angle of 30 degrees to form torrent in the slag pool (11).
3. The method of claim 2, wherein the granulated water stream is a mesh-shaped granulated water stream and covers a high-temperature slag liquid falling position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010518428.0A CN111720844A (en) | 2020-06-09 | 2020-06-09 | Granulating water system and method based on liquid slag discharging boiler of large coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010518428.0A CN111720844A (en) | 2020-06-09 | 2020-06-09 | Granulating water system and method based on liquid slag discharging boiler of large coal-fired power plant |
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| CN111720844A true CN111720844A (en) | 2020-09-29 |
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| CN202010518428.0A Pending CN111720844A (en) | 2020-06-09 | 2020-06-09 | Granulating water system and method based on liquid slag discharging boiler of large coal-fired power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676297A (en) * | 2020-11-05 | 2021-04-20 | 大唐安阳发电有限责任公司 | Thermal power factory sediment stuff pump forebay sediment thick liquid conveying system |
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2020
- 2020-06-09 CN CN202010518428.0A patent/CN111720844A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676297A (en) * | 2020-11-05 | 2021-04-20 | 大唐安阳发电有限责任公司 | Thermal power factory sediment stuff pump forebay sediment thick liquid conveying system |
| CN112676297B (en) * | 2020-11-05 | 2021-10-19 | 大唐安阳发电有限责任公司 | Thermal power factory sediment stuff pump forebay sediment thick liquid conveying system |
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Effective date of registration: 20200927 Address after: No. 246, Xiqing Road, Xiqing District, Tianjin Applicant after: HUANONG YANGLIUQING THERMOELEC Applicant after: Xi'an Thermal Power Research Institute Co.,Ltd. Applicant after: North China branch of China Huaneng Group Co., Ltd Address before: No. 246, Xiqing Road, Xiqing District, Tianjin Applicant before: Zhou Hao |
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