CN117165342B - Conveying system for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas and using method thereof - Google Patents
Conveying system for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas and using method thereof Download PDFInfo
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- CN117165342B CN117165342B CN202311317278.7A CN202311317278A CN117165342B CN 117165342 B CN117165342 B CN 117165342B CN 202311317278 A CN202311317278 A CN 202311317278A CN 117165342 B CN117165342 B CN 117165342B
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Abstract
The invention discloses a conveying system for reducing viscosity of high-concentration coal water slurry by utilizing waste heat of boiler flue gas and a using method thereof, wherein the conveying system comprises a coal water slurry stirring tank, a slurry conveying pipe is arranged at an outlet of the coal water slurry stirring tank, the slurry conveying pipe is connected with an inlet of a heat exchanger, an outlet of the heat exchanger is communicated with a combustor inlet, the combustor outlet is communicated with a hearth inlet, a coiled pipe heat exchanger is arranged in the hearth, the coiled pipe heat exchanger is communicated with an economizer inlet, a boiler water supply pipe is connected with the economizer, one path of an outlet of the boiler water supply pipe is connected to the inlet of the coiled pipe heat exchanger, the other path of the outlet of the boiler water supply pipe is pressurized by a circulating water pump and conveyed to the heat exchanger, a water outlet of the heat exchanger is connected to the inlet of the coiled pipe heat exchanger, a slurry returning pipe bypass is arranged on a slurry conveying pipeline behind the outlet of the heat exchanger, and the coiled pipe is communicated with the coal water slurry stirring tank through the slurry returning pipe. The invention can utilize the waste heat of the flue gas to heat the water-coal-slurry before the pumping process, reduce the viscosity and facilitate the transportation.
Description
Technical Field
The invention relates to the field of coal slurry conveying, in particular to a conveying system for reducing the viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas and a using method thereof.
Background
At present, the high-concentration coal water slurry has the consequences of high slurry viscosity, large transportation along-distance friction resistance, blockage risk of a transportation pipeline, influence on safe operation of a system, maintenance requirement, economic loss and the like. The viscosity-temperature characteristic of the coal water slurry exists, and when the temperature rises, the viscosity of the coal water slurry is reduced. Meanwhile, the smoke of the coal water slurry boiler contains a large amount of unused heat energy, and the waste is caused by discharging air.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a conveying system for reducing the viscosity of high-concentration coal water slurry by using the waste heat of boiler flue gas and a using method thereof, and the viscosity of the coal water slurry before the pumping process can be reduced by using the waste heat of the flue gas so as to reduce the along-path friction. The heat energy is saved, the blocking risk is reduced, and meanwhile, the conveying pressure required by the pump is reduced, so that the purposes of energy saving and safety in conveying the coal water slurry are achieved.
The technical scheme provided by the invention is as follows: the utility model provides an utilize conveying system of boiler flue gas waste heat reduction high concentration coal water slurry viscosity, includes the coal water slurry stirred tank, the export of coal water slurry stirred tank is provided with the thick liquid pipe that carries, carry thick liquid pipe and the access connection of heat exchanger, the export of heat exchanger communicates with the import of combustor, the export of combustor communicates with the import of furnace, be provided with coil pipe heat exchanger in the furnace, coil pipe heat exchanger communicates with the economizer import, boiler feed pipe links to each other with the economizer, and the export of boiler feed pipe is connected to coil pipe heat exchanger entry all the way, and all the way is through the heat supply circulating pipe, is pressurized the water inlet of sending to the heat exchanger through circulating water pump, the delivery port of heat exchanger is connected to coil pipe heat exchanger entry, is equipped with the thick liquid pipe bypass of returning behind the heat exchanger export on the thick liquid pipeline, communicates with the coal water slurry stirred tank through returning thick liquid pipe.
Further, the slurry conveying pipe comprises at least two conveying pipelines which are connected in parallel, each conveying pipeline is sequentially provided with an electric gate valve, a coal slurry pump and a filter, and the slurry conveying pipe after being connected in parallel is provided with a pressure sensor, a concentration meter and a flowmeter and then connected with the heat exchanger.
Further, a temperature sensor and a first electric regulating valve are arranged on the slurry conveying pipeline behind the outlet of the heat exchanger and are communicated with the inlet of the combustor.
Further, a flushing water pipe bypass is arranged between the coal water slurry stirring tank and the parallel conveying pipeline, a flushing water interface is arranged, a discharging pipe bypass is arranged between the parallel conveying pipeline and the heat exchanger, and a discharging port is arranged.
Further, a second electric regulating valve is arranged on the slurry returning pipe, a stirrer, a temperature sensor and a liquid level meter are arranged in the water-coal slurry stirring tank in a matched mode, and a third electric regulating valve is arranged on the heat supply circulating pipe.
Further, liquid level, temperature, pressure, flow and concentration signals in the conveying system are connected into centralized control and are interlocked with an electric gate valve, an electric regulating valve, a circulating water pump and a coal slurry pump, so that automatic control of the system is realized.
Further, the conveying system further comprises a blower, and an outlet of the blower is sequentially communicated with the air preheater and the burner through an air supply pipeline.
Further, an outlet of the economizer is communicated with an air preheater, and an outlet of the air preheater is communicated with a smoke exhaust pipe.
And a check valve is arranged on a pipeline of the water outlet of the heat exchanger connected to the inlet of the coiled pipe type heat exchanger.
The invention provides another technical scheme that: a conveying method for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas comprises the following steps:
(1) The high-concentration coal water slurry in the coal water slurry stirring tank flows out from the outlet at the bottom of the stirring tank, is pressurized by a coal slurry pump, screens out coarse particles which do not meet the granularity requirement by a filter, collects signals by a concentration meter and a flowmeter, enters a heat exchanger, is heated by waste heat from a boiler, and is further conveyed to a combustor to serve as heat source fuel of the boiler;
(2) The boiler water supply is connected with the economizer through a water supply pipe, flue gas in the economizer is heated to become hot water, a part of hot water enters a heat supply circulating pipe through a third electric regulating valve and is pumped to a heat exchanger through a circulating water pump in a pressurizing mode, a heating pipe in the heat exchanger is coiled around a slurry conveying pipe to heat the slurry conveying pipe, the hot water subjected to heat exchange is directionally conveyed to a coiled pipe heat exchanger inlet in a hearth through a check valve and is heated through the hearth to form superheated steam, and the superheated steam is sent to a steam turbine for power generation;
(3) Air enters an air preheater through a blower and an air supply pipeline, and the flue gas discharged from the economizer is preheated and then is conveyed to the burner, and the flue gas at the outlet of the air preheater is treated through a flue gas discharge pipe;
(4) When the temperature or concentration of the slurry does not reach the standard, the second electric regulating valve on the slurry returning pipe is controlled to enable the quantitative flow of the water-coal slurry to be returned to the water-coal-slurry stirring tank for circularly heating.
Compared with the prior art, the invention has the following beneficial effects:
(1) The filter is internally provided with the filter screen and the slag discharge port, and in the process of conveying the coal water slurry from the inlet end to the outlet end of the filter tank, the filter screen can intercept coarse particles and large-volume slag, and discharge the coarse particles and large-volume slag from the slag discharge port, so that the safety of a pipe conveying system is ensured.
(2) The system can lead the boiler water heated in the economizer into the heat exchanger, and recover the waste heat of the boiler flue gas to heat the slurry conveying pipe, and in the process, the conveying temperature of the water-coal-slurry is increased, so that the viscosity of the water-coal-slurry is reduced, and the friction of the water-coal-slurry conveying is further reduced. And the hot water flow led out of the economizer is controlled by adjusting the frequency of the circulating water pump and the opening of the electric regulating valve, so that the heating degree of the slurry conveying pipe is controlled.
(3) The slurry conveying pipe is provided with a slurry returning pipe bypass, the slurry returning pipe is communicated with the water-coal-slurry stirring tank, and when the temperature of slurry does not reach the standard, the water-coal-slurry with quantitative flow is returned to the water-coal-slurry stirring tank by controlling the electric regulating valve on the slurry returning pipe, so that the circulating heating of the water-coal-slurry is realized, and the heating efficiency is improved.
(4) Be equipped with wash water bypass and blowing pipe bypass on the slurry delivery pipe, set up wash water point and blowing point respectively, when the pipeline conveying system appears accident operating mode and shut down, can in time open wash water system and drain hole, discharge the intraductal thick liquids of pipeline, reduce the pipe-line and block up the risk.
(5) The slurry storage tank is provided with a temperature sensor and a liquid level meter, and the slurry conveying pipe is provided with a temperature sensor, a concentration meter, a flowmeter and a pressure sensor, so that the slurry conveying temperature, flow and concentration and the pressure along the line can be monitored in real time. The liquid level, temperature, pressure, flow and concentration signals in the system are connected into centralized control and are interlocked with an electric valve, an electric regulating valve, a circulating water pump and a coal slurry pump, so that the automatic control of the system is realized, and the overall automation degree is high.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-coal water slurry stirring tank, 2-electric gate valve, 3-coal slurry pump, 4-filter, 5-pressure sensor, 6-concentration meter, 7-flowmeter, 8-heat exchanger, 9-temperature sensor, 10-burner, 11-furnace, 12-coil heat exchanger, 13-economizer, 14-boiler feed water pipe, 15-circulating water pump, 16-check valve, 17-first electric control valve, 18-air preheater, 19-blower, 20-liquid level meter, 21-slurry conveying pipe, 21.1-slurry returning pipe bypass, 21.2-flushing pipe bypass, 21.3-discharge pipe bypass, 22-slurry returning pipe, 23-circulating heat supply pipe, 24-smoke discharge pipe, 25-air supply pipe, 26-second electric control valve, 27-third electric control valve.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are for illustrative purposes only and are shown in schematic, rather than physical, drawings, and are not to be construed as limiting the invention, and wherein certain components of the drawings are omitted, enlarged or reduced in size, and do not represent the actual product size, so it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted, and that all other embodiments obtained by those of ordinary skill in the art without making inventive efforts, based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The conveying system for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas comprises a coal water slurry stirring tank 1, wherein a slurry conveying pipe 21 is arranged at an outlet of the coal water slurry stirring tank 1, the slurry conveying pipe 21 is connected with an inlet of a heat exchanger 8, an outlet of the heat exchanger 8 is communicated with an inlet of a combustor 10, an outlet of the combustor 10 is communicated with an inlet of a hearth 11, a coiled pipe heat exchanger 12 is arranged in the hearth 11, the coiled pipe heat exchanger 12 is communicated with an inlet of an economizer 13, a boiler water feeding pipe 14 is connected with the economizer 13, one path of the outlet of the boiler water feeding pipe 14 is connected to an inlet of the coiled pipe heat exchanger 12, the other path of the outlet of the boiler water feeding pipe 14 is pressurized and conveyed to a water inlet of the heat exchanger 8 through a heat supply circulating pipe 23, a water outlet of the heat exchanger 8 is connected to the inlet of the coiled pipe heat exchanger 12, a slurry returning pipe bypass 21.1 is arranged on the slurry conveying pipe after the outlet of the heat exchanger 8, and the slurry returning pipe is communicated with the coal water slurry stirring tank 1 through a slurry returning pipe 22.
The slurry conveying pipe 21 comprises at least two conveying pipelines which are connected in parallel, each conveying pipeline is sequentially provided with an electric gate valve 2, a coal slurry pump 3 and a filter 4, and the slurry conveying pipes which are connected in parallel are provided with a pressure sensor 5, a concentration meter 6 and a flowmeter 7 and then connected with the heat exchanger 8. The coal slurry pump and the filter are both provided with standby equipment, so that the stability of the system is not affected when one equipment fails.
A temperature sensor 9 and a first electric regulating valve 17 are arranged on the slurry conveying pipeline behind the outlet of the heat exchanger 8 and are communicated with the inlet of the combustor 10.
A flushing water pipe bypass 21.2 is arranged between the water-coal-slurry stirring tank 1 and the parallel conveying pipeline, a flushing water interface is arranged, a discharging pipe bypass 21.3 is arranged between the parallel conveying pipeline and the heat exchanger 8, and a discharging port is arranged.
The slurry return pipe 22 is provided with a second electric regulating valve 26, the water-coal-slurry stirring tank 1 is provided with a stirrer, a temperature sensor and a liquid level meter 20 in a matching way, the heat supply circulating pipe 23 is provided with a circulating water pump 15 and a third electric regulating valve 27, and the heat supply circulating pipe is communicated with the economizer 13. The water outlet of the heat exchanger 8 is connected with a pipeline connected with the inlet of the coil pipe type heat exchanger 12, and a check valve 16 is arranged on the pipeline.
The liquid level, temperature, pressure, flow and concentration signals in the conveying system are connected into centralized control and are interlocked with an electric gate valve, an electric regulating valve, a circulating water pump and a coal slurry pump, so that the automatic control of the system is realized.
The delivery system further comprises a blower 19, the outlet of the blower 19 is in communication with the air preheater 18 and the burner 10 in sequence via an air supply duct 25. The outlet of the economizer 13 is communicated with an air preheater 18, and the outlet of the air preheater 18 is communicated with a smoke exhaust pipe 24.
The invention relates to a conveying system for reducing the viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas, which is arranged behind a pulping system of a coal water slurry pipeline conveying engineering process station and in front of a coal water slurry boiler burner.
When the system is in normal operation, high-concentration coal water slurry in the coal water slurry stirring tank flows out from the outlet at the bottom of the stirring tank, is pressurized by a coal slurry pump, coarse particles which do not meet the granularity requirement are sieved by a filter, signals are collected by a concentration meter and a flowmeter, enter a heat exchanger, are heated by waste heat from a boiler, and are further conveyed to a combustor to serve as heat source fuel of the boiler.
The flowing coal water slurry passes through the filter, the coal water slurry with the volume meeting the requirement enters the downstream through the filter screen, coarse particles and large-volume slag are intercepted by the filter screen which is obliquely arranged and enter the conical chute at the bottom, and the coarse particles and the large-volume slag are gathered near the slag discharge port at the bottom of the chute, so that the coarse particles and the large-volume slag are conveniently discharged.
The boiler water supply is connected with the economizer through a water supply pipe, flue gas in the economizer is heated to become hot water, a part of hot water enters a heat supply circulating pipe through an electric regulating valve and is pressurized and pumped to a heat exchanger through a circulating water pump, a heating pipe in the heat exchanger is coiled around a slurry conveying pipe to heat the slurry conveying pipe, the hot water subjected to heat exchange is directionally conveyed to a coil pipe type heat exchanger inlet in a hearth through a check valve and is heated through the hearth to form superheated steam, and the superheated steam is sent to a steam turbine for power generation.
Air enters the air preheater through the air blower and the air supply pipeline, and the flue gas discharged from the economizer is preheated and then is conveyed to the burner, and the flue gas at the outlet of the air preheater is treated through the flue gas discharge pipe.
The circulating water pump arranged on the heat supply circulating pipe is variable in frequency, and the flow of hot water flowing out of the economizer can be controlled by adjusting the frequency of the circulating water pump and the opening of the electric regulating valve, so that the heating degree of the slurry conveying pipe is controlled.
The slurry conveying pipe is provided with a temperature sensor and a slurry returning pipe bypass, the slurry returning pipe is communicated with the water-coal-slurry stirring tank, and when the temperature of slurry does not reach the standard, the water-coal-slurry with quantitative flow is returned to the water-coal-slurry stirring tank by controlling the electric regulating valve on the slurry returning pipe, so that the circulating heating of the water-coal-slurry is realized, and the heating efficiency is improved.
The concentration meter is arranged on the slurry conveying pipe, the concentration signal of the water-coal-slurry is transmitted in real time, when the concentration of the slurry does not reach the standard, the switching of the slurry pipeline is realized by adjusting the slurry conveying pipe and the electric regulating valve on the slurry returning pipe, and the unqualified slurry is returned to the water-coal-slurry stirring tank for being processed by the slurry making flow.
Be equipped with wash water bypass and blowing pipe bypass on the slurry delivery pipe, set up wash water point and blowing point respectively, when the pipeline conveying system appears accident operating mode and shut down, can in time open wash water system and drain hole, discharge the intraductal thick liquids of pipeline, reduce the pipe-line and block up the risk.
The slurry storage tank is provided with a temperature sensor and a liquid level meter, and the slurry conveying pipe is provided with a temperature sensor, a concentration meter, a flowmeter and a pressure sensor, so that the slurry conveying temperature, flow and concentration and the pressure along the line can be monitored in real time. The liquid level, temperature, pressure, flow and concentration signals in the system are connected into centralized control and are interlocked with an electric valve, an electric regulating valve, a circulating water pump and a coal slurry pump, so that the automatic control of the system is realized.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a utilize conveying system of boiler flue gas waste heat reduction high concentration coal water slurry viscosity, which is characterized in that, including coal water slurry stirred tank (1), the export of coal water slurry stirred tank (1) is provided with defeated thick liquid pipe (21), defeated thick liquid pipe (21) are connected with the import of heat exchanger (8), the export of heat exchanger (8) communicates with the import of combustor (10), the export of combustor (10) communicates with the import of furnace (11), be provided with coiled heat exchanger (12) in furnace (11), coiled heat exchanger (12) communicate with economizer (13) import, boiler feed pipe (14) links to each other with economizer (13), the export of boiler feed pipe (14) is connected to coiled heat exchanger (12) import all the way, and is connected to the water inlet of heat exchanger (8) through heat supply circulating pump (23) pressurization, the delivery port of heat exchanger (8) is connected to coiled heat exchanger (12) import, is equipped with thick liquid pipe (21.1) and is connected with coal slurry bypass (1) through the return channel (1) through the coal slurry of stirring of returning behind heat exchanger (8);
The slurry conveying pipe (21) comprises at least two conveying pipelines which are connected in parallel, each conveying pipeline is sequentially provided with an electric gate valve (2), a coal slurry pump (3) and a filter (4), and the slurry conveying pipes which are connected in parallel are provided with a pressure sensor (5), a concentration meter (6) and a flowmeter (7) and then connected with the heat exchanger (8);
A temperature sensor (9) and a first electric regulating valve (17) are arranged on a slurry conveying pipeline behind the outlet of the heat exchanger (8) and are communicated with the inlet of the combustor (10);
a flushing water pipe bypass (21.2) is arranged between the water-coal-slurry stirring tank (1) and the parallel conveying pipeline, a flushing water interface is arranged, a discharging pipe bypass (21.3) is arranged between the parallel conveying pipeline and the heat exchanger (8), and a discharging port is arranged.
2. The conveying system for reducing viscosity of high-concentration coal water slurry by utilizing waste heat of boiler flue gas according to claim 1, wherein a second electric regulating valve (26) is arranged on the slurry returning pipe (22), a stirrer, a temperature sensor and a liquid level meter (20) are arranged on the coal water slurry stirring tank (1) in a matching way, and a third electric regulating valve (27) is arranged on the heat supply circulating pipe (23).
3. The conveying system for reducing the viscosity of high-concentration coal water slurry by utilizing the waste heat of boiler flue gas according to claim 2, wherein liquid level, temperature, pressure, flow and concentration signals in the conveying system are connected into a centralized control and electric gate valve, an electric regulating valve, a circulating water pump and a coal slurry pump to be interlocked, so that automatic control of the system is realized.
4. The conveying system for reducing viscosity of high-concentration coal water slurry by utilizing waste heat of boiler flue gas according to claim 1, wherein the conveying system further comprises a blower (19), and an outlet of the blower (19) is sequentially communicated with an air preheater (18) and a burner (10) through a gas supply pipeline (25).
5. The conveying system for reducing viscosity of high-concentration coal water slurry by utilizing waste heat of boiler flue gas according to claim 4, wherein an outlet of the economizer (13) is communicated with an air preheater (18), and an outlet of the air preheater (18) is communicated with a smoke exhaust pipe (24).
6. The conveying system for reducing the viscosity of high-concentration coal water slurry by utilizing the waste heat of boiler flue gas according to claim 1, wherein a check valve (16) is arranged on a pipeline of a water outlet of the heat exchanger (8) connected to an inlet of the coiled heat exchanger (12).
7. A conveying method for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas, which is applied to the conveying system as claimed in claim 1, and is characterized by comprising the following steps:
(1) The high-concentration coal water slurry in the coal water slurry stirring tank flows out from the outlet at the bottom of the stirring tank, is pressurized by a coal slurry pump, screens out coarse particles which do not meet the granularity requirement by a filter, collects signals by a concentration meter and a flowmeter, enters a heat exchanger, is heated by waste heat from a boiler, and is further conveyed to a combustor to serve as heat source fuel of the boiler;
(2) The boiler water supply is connected with the economizer through a water supply pipe, flue gas in the economizer is heated to become hot water, a part of hot water enters a heat supply circulating pipe through a third electric regulating valve and is pumped to a heat exchanger through a circulating water pump in a pressurizing mode, a heating pipe in the heat exchanger is coiled around a slurry conveying pipe to heat the slurry conveying pipe, the hot water subjected to heat exchange is directionally conveyed to a coiled pipe heat exchanger inlet in a hearth through a check valve and is heated through the hearth to form superheated steam, and the superheated steam is sent to a steam turbine for power generation;
(3) Air enters an air preheater through a blower and an air supply pipeline, and the flue gas discharged from the economizer is preheated and then is conveyed to the burner, and the flue gas at the outlet of the air preheater is treated through a flue gas discharge pipe;
(4) When the temperature or concentration of the slurry does not reach the standard, the second electric regulating valve on the slurry returning pipe is controlled to enable the quantitative flow of the water-coal slurry to be returned to the water-coal-slurry stirring tank for circularly heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311317278.7A CN117165342B (en) | 2023-10-12 | 2023-10-12 | Conveying system for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311317278.7A CN117165342B (en) | 2023-10-12 | 2023-10-12 | Conveying system for reducing viscosity of high-concentration coal water slurry by using waste heat of boiler flue gas and using method thereof |
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| CN117165342A CN117165342A (en) | 2023-12-05 |
| CN117165342B true CN117165342B (en) | 2024-05-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910098A (en) * | 2016-04-11 | 2016-08-31 | 华中科技大学 | Coal water slurry oxygen-rich combustion system |
| CN210287243U (en) * | 2019-06-14 | 2020-04-10 | 张佐永 | Pulverized coal furnace of power plant |
| CN210560287U (en) * | 2019-07-23 | 2020-05-19 | 中石化南京工程有限公司 | Gasification coal water slurry preheating system |
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2023
- 2023-10-12 CN CN202311317278.7A patent/CN117165342B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910098A (en) * | 2016-04-11 | 2016-08-31 | 华中科技大学 | Coal water slurry oxygen-rich combustion system |
| CN210287243U (en) * | 2019-06-14 | 2020-04-10 | 张佐永 | Pulverized coal furnace of power plant |
| CN210560287U (en) * | 2019-07-23 | 2020-05-19 | 中石化南京工程有限公司 | Gasification coal water slurry preheating system |
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