CN216481074U - Novel pulverized coal boiler blending and gasifying fine slag system in pulverized coal conveying mode - Google Patents
Novel pulverized coal boiler blending and gasifying fine slag system in pulverized coal conveying mode Download PDFInfo
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- CN216481074U CN216481074U CN202220324131.5U CN202220324131U CN216481074U CN 216481074 U CN216481074 U CN 216481074U CN 202220324131 U CN202220324131 U CN 202220324131U CN 216481074 U CN216481074 U CN 216481074U
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Abstract
The utility model discloses a novel system and method for blending and burning gasified fine slag in a pulverized coal boiler in a powder conveying mode, which mainly comprise a gasified fine slag conveying system, a high-temperature high-pressure atomizing and drying system and a novel powder conveying system. The gasification fine slag conveying system comprises a gasification fine slag storage bin, a positive-pressure feeder, a paste pump and a conveying pipeline which are connected in sequence; the high-temperature high-pressure atomization drying system comprises a hot primary air bypass and an atomization device, atomized air is led out from the hot primary air bypass, a pressure head is improved by a booster fan and then led to the atomization device, and atomization and drying of gasified fine slag are achieved; the gasification fine slag carrying flow conveying pipeline at the outlet of the atomizing device is connected with the pulverized coal pipeline through the mixing device to form a novel powder conveying system, so that the gasification fine slag carrying flow and the pulverized coal airflow are efficiently mixed. The invention avoids the corrosion of the gasified fine slag to the coal conveying system and the components in the coal mill; synchronously realizing atomization and drying of the gasified fine slag; the blending combustion proportion is easy to control; the transformation of a boiler body and a coal mill is avoided.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation and solid waste handle, concretely relates to system of thin sediment of coal powder boiler blending burning gasification under novel defeated powder mode.
Background
The State administration of China, "carbon Peak action scheme 2030 ago", aims at implementing major strategic decisions of carbon Peak and carbon neutralization, strengthening and promoting carbon Peak action, and emphasizing the strengthening of the comprehensive utilization of bulk solid wastes. The comprehensive development and utilization level and the comprehensive utilization rate of mineral resources are improved, the key points are that large solid wastes such as coal gangue, fly ash, tailings, associated minerals, smelting slag, industrial byproduct gypsum, building garbage, crop straws and the like are used, large-dosage, large-scale and high-valued utilization is supported, and the application to substitute resources such as native non-metallic ores, gravels and the like is encouraged. By 2025 years, the annual use amount of large solid wastes reaches about 40 hundred million tons; by 2030 years, annual utilization amount reaches about 45 hundred million tons.
With the large-scale popularization of the coal gasification technology, the generation, stockpiling and landfill of the coal gasification slag are larger and larger, so that serious environmental pollution and land resource waste are caused, the sustainable development of coal chemical enterprises is adversely affected, and the coal gasification slag treatment is urgent. The proportion of coal gasification ash in solid waste is large, the ash is reasonably utilized, the harm of the ash can be eliminated, a large amount of substance resources can be saved, waste is changed into wealth, and the method is an important aspect related to green sustainable development of the coal chemical industry and an important aspect of realizing carbon peak reaching and carbon neutralization. The comprehensive utilization of the gasified slag mainly comprises building materials, soil water body remediation, residual carbon utilization based on co-combustion and high-value utilization based on a catalyst carrier. The carbon content of the gasified fine slag is higher than that of the gasified coarse slag, so that the building material mixing amount is low, the quality is unstable, and the economic and environmental benefits are poor. In the aspects of development and utilization of carbon materials, preparation of ceramic materials and the like, the gasification fine slag has relatively obvious economic benefit, but is in the laboratory research stage, has the problems of high cost, complex flow, difficult regulation and control of impurities, small downstream market and the like, and cannot realize large-scale utilization.
The high carbon content of the gasified fine slag is one of the reasons that the gasified fine slag is difficult to utilize, and the high carbon content gasified fine slag is circularly mixed and burnt, so that not only is the carbon resource utilized, but also the high carbon slag is converted into the low carbon slag, and the gasification utilization of building materials of the gasified slag is facilitated. The gasified fine slag has high water content and high viscosity, can be directly introduced into a circulating fluidized bed boiler for mixed combustion through a pipeline conveying system by virtue of a paste pump, and can also be introduced into a coal conveying system after being pre-dried. Because the gasification fine slag has high water content, a large amount of drying media such as steam and the like are consumed through the pre-drying treatment process, the operation cost is high, and secondary dust pollution is easily caused; meanwhile, the gasified fine slag is dried by the drying equipment, mixed with raw coal and sent to a boiler for combustion, crushing equipment and a coal bunker are often blocked, and the mixing combustion proportion is low.
The pulverized coal boiler is a boiler device using pulverized coal as fuel, and has the advantages of rapid and complete combustion, large capacity, high efficiency, wide coal adaptation range, convenient control and adjustment, and the like. The pulverized coal boiler is adopted to mix and burn the gasified fine slag, so that the processing path of the gasified fine slag is greatly widened, the resource comprehensive utilization of the gasified fine slag in a wider range is realized, and the environmental pollution is reduced. But the technology of directly mixing and burning gasified fine slag in the existing pulverized coal boiler is not mature.
The water content of the gasified fine slag is high, and the traditional conveying mode causes blockage of a coal conveying system and a coal feeding system, adhesion to a belt of a coal feeder, unsmooth coal feeding and unit load fluctuation.
The synthetic gas of the gasification device contains a large amount of chloride, and when the synthetic gas is subjected to washing and flash evaporation processes at all levels, chloride ions are not easy to react with other substances, are not easy to precipitate and can not be decomposed, and finally, a part of chloride enters the gasified fine slag, so that the gasified fine slag has high corrosivity. If the gasified fine slag is directly introduced into the coal mill, the corrosion and abrasion of parts in the coal mill, such as a grinding roller, a grinding disc, a separator and the like, can be accelerated; the moisture content of the gasified fine slag is high, and the gasification fine slag enters a coal mill to have great influence on the drying output of a powder making system.
Disclosure of Invention
In order to overcome above technical problem, the utility model provides a system of thin sediment of gasification is mixed to coal powder boiler under novel defeated powder mode is provided, introduces pulverized coal boiler furnace through adopting pressurization pumping installations, high temperature high pressure atomizing drying device, novel defeated powder mode with the thin sediment of gasification, with the help of the air current of high temperature, high mixing strength, promotes the high-efficient burning conversion of the thin sediment of gasification, realizes that the thin sediment of gasification scale is absorbed and high-valued utilization.
In order to realize the purpose, the utility model discloses a technical scheme is:
a system for blending and burning gasified fine slag in a pulverized coal boiler in a novel powder conveying mode comprises a gasified fine slag conveying system, a high-temperature high-pressure atomizing and drying system and a novel powder conveying system;
the gasification fine slag conveying system comprises a gasification fine slag storage bin 2 for storing finished product gasification fine slag, and the gasification fine slag storage bin 2 is connected with the high-temperature high-pressure atomization drying system through a positive-pressure feeder 3 and a paste pump 4 through a conveying pipeline 5;
the high-temperature high-pressure atomization drying system mainly comprises an atomization device 6 and a hot primary air bypass 8, wherein the hot primary air bypass 8 is led out from a proper position of a hot primary air main pipe 7, a booster fan 10 is arranged on the bypass, and the downstream of the bypass is connected with the atomization device 6;
the novel powder conveying system comprises a gasified fine slag carrying flow conveying pipeline 11 connected with the outlet of the atomizing device 6, and the gasified fine slag carrying flow conveying pipeline 11 is connected with a coal powder pipeline 14 through a mixing device 15.
The gasification fine slag conveying system and the raw coal conveying system are independently arranged.
The pulverized coal pipeline 14 is connected with raw coal through a coal mill 13 and a coal feeding system 12.
The mixing device 15 is of a Y-shaped mixing structure, and the included angle of the two branch pipelines is small; the outlet pipeline of the mixing device 15 is connected with the hearth of the pulverized coal boiler 1 through a burner 16.
And an atomization air quantity regulating valve 9 is arranged between the hot primary air bypass 8 and the booster fan 10.
A novel use method of a system for blending and burning gasified fine slag in a pulverized coal boiler in a powder conveying mode comprises the following steps;
(a) the finished product gasified fine slag is stored in a gasified fine slag storage bin 2 and is led to an atomization device 6 through a positive pressure feeder 3 and a paste pump 4 through a conveying pipeline 5; leading raw coal to a coal mill 13 through a coal conveying system 12, and leading the raw coal to a pulverized coal pipeline 14 after grinding and drying;
(b) hot air for atomizing and drying the gasified fine slag is led out through a hot primary air bypass 8, is pressurized by a booster fan 10 and then is led to an atomizing device 6, and the atomization and drying of the gasified fine slag are realized by high-temperature and high-pressure hot air; the atomization air flow is adjusted through the atomization air flow adjusting valve 9, and the performance of the atomization device 6 is improved;
(c) the atomization device 6 is used for realizing the sufficient atomization and drying of the gasified fine slag, and the formed gasified fine slag carrying flow is introduced into the coal powder pipeline 14 through the mixing device 15;
(d) after the gasified fine slag carrying flow is mixed with the pulverized coal airflow, the mixed flow is introduced into a hearth of the pulverized coal boiler 1 by the combustor 16, and the high-efficiency combustion conversion of the gasified fine slag is realized by virtue of the high-temperature and high-mixing-strength airflow.
The utility model has the advantages that:
the utility model discloses a lotion pump realizes the transport of the thin sediment of gasification, make full use of the thin sediment moisture content of gasification high characteristics. By adopting the conveying scheme, the gasified fine slag does not pass through a coal conveying system, a coal feeding system and a coal mill, so that the blockage of a raw coal bin is avoided, the adhesion of a belt of the coal mill to raw coal is reduced, and the corrosion of the highly corrosive gasified fine slag to the raw coal bin and internal parts of the coal mill is avoided; the direct influence of the gasified fine slag on the drying output of the powder making system is avoided.
The utility model discloses with the help of dry atomizing device of high temperature high pressure and novel defeated powder system, realize the atomizing and the drying of the thin sediment of gasification, promote the thin sediment of gasification to carry the intensive mixing of flow and buggy air current.
The utility model discloses fine sediment of well gasification is mixed and is burnt, only carries out local transformation to stokehold pulverized coal pipeline, optimize the hybrid mode can, do not relate to boiler body and coal pulverizer body.
The grain size of the gasified fine slag is very small, the gasified fine slag can be directly introduced into a hearth by means of a pulverized coal pipeline without being ground by a coal mill, and the burnout characteristic of the gasified fine slag is basically not influenced;
the utility model discloses the fine sediment of well gasification need not pass through extra predrying, has reduced drying device's investment cost and steam cost.
The proportion of the fine gasification slag mixed burning is easy to control.
Drawings
FIG. 1 is a system layout diagram of the pulverized coal boiler for direct blending gasification of fine slag.
Description of reference numerals:
1 is a pulverized coal boiler; 2 is a gasification fine slag storage bin; 3 is a positive pressure feeder; 4 paste pump; 5, conveying a pipeline; 6 is an atomization device; 7 is a hot primary air main pipe; 8 is a hot primary air bypass; 9 is an atomization air quantity regulating valve; 10 is a booster fan; 11 is a gasification fine slag carrying flow conveying pipeline; 12, a raw coal conveying system; 13 is a coal mill; 14 a pulverized coal pipeline; 15 is a mixing device; and 16 is a burner.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the system for direct blending and gasification of fine slag for a pulverized coal boiler provided by the present invention mainly comprises a pulverized coal boiler 1; a gasification fine slag storage bin 2; a positive pressure feeder 3; a paste pump 4; a delivery duct 5; an atomizing device 6; a hot primary air bypass 8; a booster fan 10; a pulverized coal pipe 14; a mixing device 15. The atomized air is led to the atomizing device 6 through the hot primary air bypass 8; the gasification fine slag carrying flow conveying pipeline 11 is connected with a coal powder pipeline 14 through a mixing device 15.
When the pulverized coal boiler is used for blending and burning the gasified fine slag, the gasified fine slag conveying system and the raw coal conveying system are independently arranged. The gasified fine slag is stored in a gasified fine slag storage bin 2 and is led to an atomizing device 6 through a positive pressure feeder 3 and a paste pump 4 through a conveying pipeline 5; the raw coal is introduced to a coal mill 13 through a coal conveying system 12, and is introduced to a pulverized coal pipeline 14 after being ground and dried.
The atomization and drying of the gasified fine slag are realized by the atomization device 6, and a gasified fine slag carrying flow is formed. The gasification fine slag carrying flow conveying pipeline 11 is connected with the pulverized coal pipeline 14 through a Y-shaped mixing device 15, and the included angle of the two branch pipelines is small.
The gasified fine slag carrying flow is mixed with the pulverized coal airflow and then introduced into the hearth of the pulverized coal boiler 1 by the burner 16.
The hot air for atomizing and drying the gasified fine slag is led out through the hot primary air bypass 8, pressurized by the booster fan 10 and led to the atomizing device 6. The atomization air flow is adjusted through the atomization air flow adjusting valve 9, and the performance of the atomization device is improved.
The output force and the number of the atomization devices 6 determine the proportion of the fine slag mixed and gasified in the pulverized coal boiler.
The utility model discloses a concrete implementation process does:
the gasification fine slag storage bin 2 is used for storing finished gasification fine slag after impurity removal (solid large objects, metal and the like); quantitative feeding and metering of the gasified fine slag are realized through the positive-pressure feeder 3; the gasification fine slag is pressurized by a paste pump 4 and then led to an atomization device 6 through a conveying pipeline 5. The system and the method are adopted to finish the primary conveying of the gasified fine slag.
High-temperature hot primary air is led out through a bypass, a pressure head is improved by adopting a booster fan 10, the high-temperature hot primary air is led into an atomizing device 6, atomization and drying of gasified fine slag are completed through the atomizing device 6, gasified fine slag carrying flow is formed, and the high-temperature hot primary air is led into a pulverized coal pipeline 14 through a gasified fine slag carrying flow conveying pipeline 11 and a mixing device 15. The system and the method are adopted to complete the secondary conveying of the gasified fine slag. A thermocouple can be arranged on the gasification fine slag carrying flow conveying pipeline 11 to monitor the temperature of the mixed gasification fine slag carrying flow.
An atomization air quantity regulating valve 9 for regulating the air quantity is arranged on the hot primary air bypass 8, and the valve adopts an electric valve and can carry out feedback control according to the temperature of the gasified fine slag carrying flow.
The raw coal is introduced to a coal mill 13 through a coal conveying system 12, and is introduced to a pulverized coal pipeline 14 after being ground and dried. The system and the method are adopted to complete the conveying of the raw coal.
The mixing device 15 adopts a Y-shaped structure, the gasification fine slag carrying flow pipeline and the coal powder airflow pipeline are arranged at a small included angle, and during specific implementation, the gasification fine slag carrying flow pipeline can be arranged at an included angle not greater than 30 degrees, and the tail end of the gasification fine slag carrying flow conveying pipeline can be arranged in the coal powder pipeline 14, so that the leading-out direction of the gasification fine slag carrying flow is consistent with the coal powder airflow direction, and the mixing effect is improved.
The gasified fine slag carrying flow is mixed with the pulverized coal airflow and then introduced into the hearth of the pulverized coal boiler 1 through the burner 16.
The utility model discloses at the concrete implementation in-process, fine sediment conveying system of gasification, atomizing device, mixed structure and low reaches buggy pipeline all need adopt corrosion-resistant material to make, and atomizing device can adopt multistage atomizing structure.
The above description is provided for the purpose of describing the present invention in more detail with reference to the specific preferred embodiments, and it should not be construed that the present invention is limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in various forms without departing from the spirit and scope of the present invention.
Claims (6)
1. A system for blending and burning gasified fine slag in a coal powder boiler in a novel powder conveying mode is characterized by comprising a gasified fine slag conveying system, a high-temperature high-pressure atomization drying system, a raw coal conveying system and a novel powder conveying system;
the gasification fine slag conveying system comprises a gasification fine slag storage bin (2) for storing finished product gasification fine slag, and the gasification fine slag storage bin (2) is connected with the high-temperature high-pressure atomization drying system through a positive-pressure feeder (3), a paste pump (4) and a conveying pipeline (5);
the high-temperature high-pressure atomization drying system comprises a hot primary air bypass (8) and an atomization device (6), wherein the hot primary air bypass (8) is led out from a proper position of a hot primary air main pipe (7), a booster fan (10) is arranged on the bypass, and the downstream of the hot primary air bypass is connected with the atomization device (6);
the raw coal conveying system comprises a coal conveying system (12), a coal mill (13) and a pulverized coal pipeline (14);
the novel powder conveying system comprises a gasified fine slag carrying flow conveying pipeline (11) connected with an outlet of the atomizing device (6), and the gasified fine slag carrying flow conveying pipeline (11) is connected with a coal powder pipeline (14) through a mixing device (15).
2. The system for blending and burning gasified fine slag in the pulverized coal boiler in the novel pulverized coal conveying mode as claimed in claim 1, wherein the gasified fine slag conveying system and the raw coal conveying system are independently arranged.
3. The system for blending and burning gasified fine slag in a pulverized coal boiler in a novel powder conveying mode as claimed in claim 1, wherein the atomization device (6) is used for atomizing and drying the gasified fine slag to form a gasified fine slag carrying flow.
4. The system for blending and burning gasified fine slag in the pulverized coal boiler in the novel powder conveying mode as claimed in claim 1, wherein the mixing device (15) is of a Y-shaped structure, and the gasified fine slag carrying flow conveying pipeline (11) and the pulverized coal pipeline (14) are arranged at a small included angle; the gasified fine slag carrying flow is mixed with the pulverized coal airflow and then is connected with a hearth of the pulverized coal boiler (1) through a burner (16).
5. The system for blending, burning and gasifying fine slag for the pulverized coal boiler in the novel powder conveying mode as claimed in claim 1, wherein an atomizing air quantity regulating valve (9) is arranged between the primary hot air bypass (8) and the booster fan (10), and the performance of the atomizing device is improved by regulating the atomizing air quantity through the atomizing air quantity regulating valve (9).
6. The system for blending and burning gasified fine slag in a pulverized coal boiler in a novel powder conveying mode as claimed in claim 1, wherein the gasified fine slag conveying system, the atomizing device (6), the mixing device (15) and the downstream pulverized coal pipeline thereof are all made of corrosion-resistant materials.
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| CN202220324131.5U CN216481074U (en) | 2022-02-17 | 2022-02-17 | Novel pulverized coal boiler blending and gasifying fine slag system in pulverized coal conveying mode |
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| CN202220324131.5U CN216481074U (en) | 2022-02-17 | 2022-02-17 | Novel pulverized coal boiler blending and gasifying fine slag system in pulverized coal conveying mode |
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