CN-116624865-B - Coal motor group pulverized coal stable combustion and concentration device

CN116624865BCN 116624865 BCN116624865 BCN 116624865BCN-116624865-B

Abstract

The invention relates to a coal stabilizing and concentrating device for coal powder of a coal motor group, which comprises a combustor, a stabilizing burner and a concentrator, wherein the concentrator is used for dividing primary air coal powder airflow provided by a coal powder air source into first airflow, second airflow and third airflow, the first airflow, the second airflow and the third airflow are combusted in the stabilizing burner and the combustor, a first inlet is communicated with the concentrator so as to introduce the first airflow into a coal powder pipe assembly, the coal powder pipe assembly can divide the first airflow to obtain first sub-airflow and second sub-airflow, the coal powder concentration of the first sub-airflow is smaller than that of the second sub-airflow, a first outlet is used for discharging the first sub-airflow into a cavity, a second outlet is used for discharging the second sub-airflow into the cavity, and a secondary air pipe is arranged on the outer periphery of the inlet end of the stabilizing burner and is communicated with the cavity. Therefore, the coal motor group pulverized coal stable combustion and concentration device provided by the embodiment of the invention has the advantages of good combustion stability, good environmental protection effect, low production cost and the like.

Inventors

NIU FANG
ZHANG BIN
ZHANG XUFANG
CUI MINGSHUANG
WANG XIN
WANG ZHIXING
LIANG XING
YAN SHUJUAN
YU HAIPENG
DONG ZHI
WANG SHIJUN
ZHANG HONGSHUN
LIU PENGZHONG
TAN JING
ZHANG JING
LIU GANG
LIU ZENGBIN
CHEN ANHE
DUAN LU
GONG YANYAN
JIA DONGLIANG
WEI YANRONG
DU BOXI

Assignees

北京天地融创科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230625

Claims (9)

1. The utility model provides a coal motor group buggy steady burning and enrichment facility which characterized in that includes: A burner and a concentrator; A burner having an outlet end in communication with the burner, the burner extending in a first direction, the burner comprising a cavity and a pulverized coal pipe assembly at least partially disposed within the cavity, the concentrator being communicable with the pulverized coal pipe assembly for introducing a first flow of gas with pulverized coal into the pulverized coal pipe assembly; The pulverized coal pipe assembly can divide the first air flow into a first sub-air flow and a second sub-air flow and guide the first air flow into the cavity, the pulverized coal concentration of the first sub-air flow is smaller than that of the second sub-air flow, and the guide position of the second sub-air flow is adjacent to the outlet end of the stabilizer relative to the guide position of the first sub-air flow; The secondary air pipe is communicated with the cavity; the combustion stabilizer comprises a shell, a first inlet, a first outlet and a second outlet, wherein the cavity is arranged in the shell, the first direction comprises a first sub-direction and a second sub-direction opposite to the first sub-direction, and the direction from the inlet end of the combustion stabilizer to the outlet end of the combustion stabilizer is the first sub-direction; The first inlet, the first outlet and the second outlet are all arranged on the pulverized coal pipe assembly and are sequentially and alternately arranged along a first sub-direction, the first inlet is communicated with each of the first outlet and the second outlet, the first outlet and the second outlet are all arranged in the cavity and are all arranged towards the first inlet along the second sub-direction, and the outlet end of the stabilizer is provided with a stabilizer outlet; The concentrator is adapted to communicate with a pulverized coal gas source, the concentrator is for splitting a primary air pulverized coal gas stream provided by the pulverized coal gas source into the first gas stream, a second gas stream and a third gas stream, the concentrator is communicable with the first inlet for injecting the first gas stream into the pulverized coal pipe assembly, and the concentrator is communicable with the burner for injecting the second gas stream and the third gas stream into the burner; The first inlet is communicated with the concentrator so as to guide the first airflow into the pulverized coal pipe assembly, the pulverized coal pipe assembly can split the first airflow to obtain the first sub-airflow and the second sub-airflow, the first outlet is used for discharging the first sub-airflow into the cavity, and the second outlet is used for discharging the second sub-airflow into the cavity; the secondary air pipe is arranged on the outer peripheral side of the inlet end of the flame stabilizer, and the air outlet direction of the secondary air pipe is tangential with the inner peripheral wall of the shell.
2. The coal motor group pulverized coal stable combustion and concentration device according to claim 1, wherein the pulverized coal pipe assembly comprises: a first tube, an inlet end of the first tube and an outlet end of the first tube being arranged opposite in the first direction, the first inlet being provided at the inlet end of the first tube; The concentration piece is annular, the inner peripheral wall of the concentration piece is provided with a concentration adjusting channel, and the cross section area of the concentration adjusting channel is gradually reduced and then gradually increased along the first sub-direction; The concentrating piece and the second pipe are arranged in the first pipe, the concentrating piece and the second pipe are sequentially and alternately arranged in the first sub-direction, the inner peripheral wall of the first pipe and the outer peripheral wall of the second pipe define a first channel, the inner peripheral wall of the second pipe defines a second channel, and the inlet end of the second pipe and the outlet end of the second pipe are oppositely arranged in the first direction; The first backflow part is sleeved on the outer peripheral side of the second pipe and is connected with the outlet end of the second pipe, the outlet end of the first pipe stretches into the space between the first backflow part and the second pipe, so that the inner peripheral wall of the first backflow part and the outer peripheral wall of the first pipe define a backflow channel, the backflow channel is communicated with the first channel, and the opening of the backflow channel faces the inlet end of the first pipe to form the first outlet; the first backflow part and the second backflow part are sequentially and alternately arranged in the first sub-direction, and a part of the second backflow part is sleeved on the outer peripheral side of the first backflow part so as to form the second outlet.
3. The coal motor group pulverized coal stable combustion and concentration device according to claim 1, wherein the shell comprises a first section, a second section, a third section and a fourth section which are sequentially connected in the first direction, the secondary air pipe is connected with the first section, the first section and the third section are cylindrical, the cross-sectional area of the second section is gradually increased along the first sub-direction, the cross-sectional area of the fourth section is gradually decreased along the first sub-direction, the first outlet is arranged in the second section, and the second outlet is arranged in the third section.
4. A coal electric group pulverized coal stable combustion and concentration apparatus according to any one of claims 1 to 3, wherein the burner comprises a burner tube assembly, the stable burner and the burner tube assembly being arranged in sequence along the first sub-direction, an outlet end of the burner tube assembly being adapted to be connected to a burner furnace; the combustion tube assembly comprises an inner tube and an outer tube, and the outer tube is sleeved outside the inner tube; The inner pipe comprises a first combustion section and a second combustion section which are sequentially arranged and communicated in the first sub-direction, and the outlet end of the first combustion section extends into the inlet end of the second combustion section, so that the outer peripheral wall of the first combustion section and the inner peripheral wall of the second combustion section define a third channel; The outer tube comprises a rectifying section and a flow guiding section which are sequentially arranged along the first sub-direction, the inlet end of the rectifying section is in sealing connection with the inlet end of the first combustion section, and the inner peripheral wall of the flow guiding section and the outer peripheral wall of the second combustion section define a fourth channel.
5. The coal-electric-group pulverized coal stable combustion and concentration device according to claim 4, wherein the combustor further comprises a feeding pipe assembly, the feeding pipe assembly comprises a first feeding pipe and a second feeding pipe which are sequentially and alternately arranged in the first sub-direction, the first feeding pipe is used for communicating the concentrator with the first combustion section so as to guide the second airflow into the inner pipe, the second feeding pipe is used for communicating the concentrator with the rectifying section so as to guide the third airflow into the combustion pipe assembly, the combustion pipe assembly can divide the third airflow into a third sub-airflow and a fourth sub-airflow, the third channel is used for allowing the third sub-airflow to enter the second combustion section, and the fourth channel is used for allowing the fourth sub-airflow to pass so as to be converged with the airflow in the second combustion section.
6. The coal motor group pulverized coal stable combustion and concentration device according to claim 5, wherein the first feeding pipe comprises: A first transition section extending along the first direction, the cross-sectional area of the first transition section gradually decreasing along the first sub-direction; The inlet end of the first feeding section extends along a second direction, the second direction is orthogonal to the first direction, the outlet end of the first feeding section extends along the first direction, the first feeding section, the first transition section and the first combustion section are sequentially communicated, the burner is connected with the first feeding section, the inlet end of the burner is arranged outside the first feeding section, the outlet end of the burner penetrates through the side wall of the first feeding section and stretches into the first feeding section, and the burner outlet is positioned in the first transition section.
7. The coal motor group pulverized coal stable combustion and concentration device according to claim 5 or 6, wherein the concentrator comprises: the inlet end of the total feeding pipe is suitable for being communicated with a pulverized coal air source, and the total feeding pipe extends along a second direction; A first branch pipe, a second branch pipe and a third branch pipe, wherein the first branch pipe, the second branch pipe and the third branch pipe are arranged at intervals, and the outlet end of the total feeding pipe is communicated with each of the first branch pipe, the second branch pipe and the third branch pipe; The main feed pipe is suitable for leading the primary air pulverized coal airflow into the concentrator, the concentrator can split the primary air pulverized coal airflow so as to obtain the first airflow, the second airflow and the third airflow, the first branch pipe is communicated with the first inlet so as to lead the first airflow into the combustor, the second branch pipe is communicated with the first feed pipe so as to lead the second airflow into the combustor, and the third branch pipe is communicated with the second feed pipe so as to lead the third airflow into the combustor.
8. The coal motor group pulverized coal stable combustion and concentration device according to claim 7, wherein the concentrator further comprises a concentration assembly, the concentration assembly is arranged in the total feed pipe, the concentration assembly comprises a first concentration block, a second concentration block and a flow dividing plate, the first concentration block, the second concentration block and the flow dividing plate are sequentially and alternately arranged in the second direction, and the first concentration block is arranged adjacent to the inlet end of the total feed pipe relative to the flow dividing plate; the total feeding pipe is provided with a first side wall, a second side wall, a third side wall and a fourth side wall which are sequentially connected in the circumferential direction, the first side wall and the third side wall are oppositely arranged in the first direction, the third side wall is adjacent to the third branch pipe relative to the first side wall, and the second side wall and the fourth side wall are oppositely arranged; A first runner, a second runner, a third runner and a fourth runner which are arranged in an array are arranged in the total feed pipe, in the first sub-direction, the first runner and the second runner are sequentially arranged, the third runner and the fourth runner are sequentially arranged, the first runner is arranged adjacent to the second side wall relative to the third runner, the first concentration block is arranged on the third side wall so as to block the second runner and the fourth runner, the second concentration block is arranged on the second side wall so as to block the first runner and the second runner, or the second concentration block is arranged on the fourth side wall so as to block the third runner and the fourth runner; the flow dividing plate is cross-shaped so as to be adapted to the first to fourth flow passages.
9. The apparatus for stabilizing and concentrating pulverized coal in a coal electric machine set according to claim 8, further comprising a baffle plate provided on an inner peripheral wall of an inlet end of the second branch pipe, and disposed adjacent to the first branch pipe with respect to the third branch pipe, the baffle plate being disposed opposite to the third flow passage in an extending direction of the total feed pipe.

Description

Coal motor group pulverized coal stable combustion and concentration device Technical Field The invention relates to the technical field of pulverized coal combustion, in particular to a pulverized coal stable combustion and concentration device of a coal motor group. Background If the stable combustion capability of the pulverized coal burner in the low-load and variable-load operation process of the coal-fired power plant needs to be improved, the stable combustion is usually realized by adding an ignition device or adding auxiliary fuel. The common ignition and stable combustion method uses diesel oil as fuel, and the method needs to use a large amount of diesel oil, has very high cost, and brings new pollutant generation, such as sulfide and nitrogen oxide, for oil injection combustion supporting. The pulverized coal burner with the plasma ignition device can improve the stable combustion capability of low load, but the service life of the cathode material of the plasma ignition device is very short, thereby increasing the running cost of the unit. In recent years, a method of heating the combustion chamber housing by using the resistance wire to heat fuel in the combustion chamber has appeared, however, the heating efficiency of indirectly heating the internal structure of the combustion chamber by using the resistance wire is low, and the resistance wire and the combustion chamber housing need to bear high temperature in the heating process, so that the requirements on the materials of the resistance wire and the combustion chamber are high. In summary, how to provide a technology for improving the stable combustion capability of a pulverized coal burner in the low-load and variable-load operation process without adding auxiliary fuel and without adding an ignition device has become an important problem to be solved by the research and technicians in the field. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a pulverized coal stable combustion and concentration device of a coal motor group. The coal motor group pulverized coal stable combustion and concentration device provided by the embodiment of the invention comprises: A burner and a concentrator; A burner having an outlet end in communication with the burner, the burner extending in a first direction, the burner comprising a cavity and a pulverized coal pipe assembly at least partially disposed within the cavity, the concentrator being communicable with the pulverized coal pipe assembly for introducing a first flow of gas with pulverized coal into the pulverized coal pipe assembly; The pulverized coal pipe assembly can divide the first air flow into a first sub-air flow and a second sub-air flow and guide the first air flow into the cavity, the pulverized coal concentration of the first sub-air flow is smaller than that of the second sub-air flow, and the guide position of the second sub-air flow is adjacent to the outlet end of the stabilizer relative to the guide position of the first sub-air flow; and the secondary air pipe is communicated with the cavity. Therefore, the coal motor group pulverized coal stable combustion and concentration device provided by the embodiment of the invention has the advantages of good combustion stability, good environmental protection effect, low production cost and the like. In some embodiments, the stabilizer comprises a housing, a first inlet, a first outlet, and a second outlet, the cavity is disposed in the housing, the first direction comprises a first sub-direction and a second sub-direction opposite to the first sub-direction, and a direction from an inlet end of the stabilizer to an outlet end of the stabilizer is the first sub-direction; The first inlet, the first outlet and the second outlet are all arranged on the pulverized coal pipe assembly and are sequentially and alternately arranged along a first sub-direction, the first inlet is communicated with each of the first outlet and the second outlet, the first outlet and the second outlet are all arranged in the cavity and are all arranged towards the first inlet along the second sub-direction, and the outlet end of the stabilizer is provided with a stabilizer outlet; The concentrator is adapted to communicate with a pulverized coal gas source, the concentrator is for splitting a primary air pulverized coal gas stream provided by the pulverized coal gas source into the first gas stream, a second gas stream and a third gas stream, the concentrator is communicable with the first inlet for injecting the first gas stream into the pulverized coal pipe assembly, and the concentrator is communicable with the burner for injecting the second gas stream and the third gas stream into the burner; The first inlet is communicated with the concentrator so as to guide the first airflow into the pulverized coal pipe assembly, the p