CN212711680U - Pulverized coal conveying system with supercritical carbon dioxide as conveying gas - Google Patents
Pulverized coal conveying system with supercritical carbon dioxide as conveying gas Download PDFInfo
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- CN212711680U CN212711680U CN202020925408.0U CN202020925408U CN212711680U CN 212711680 U CN212711680 U CN 212711680U CN 202020925408 U CN202020925408 U CN 202020925408U CN 212711680 U CN212711680 U CN 212711680U
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Abstract
The utility model discloses a pulverized coal conveying system using supercritical carbon dioxide as conveying gas, which comprises a pulverized coal pipeline, a low-pressure storage tank, a plurality of pressure-variable lock buckets, an additive storage tank, a high-pressure feed tank, a gasification furnace, a carbon dioxide storage tank and a supercritical carbon dioxide preparation system; the gas outlet of the gas heater of the supercritical carbon dioxide preparation system is respectively communicated with the inlet of the pressure-variable lock hopper and the inlet of the high-pressure feed tank. The utility model has the advantages that the system of the utility model has simple connection relation, easy realization and automatic control function; the conveying stability of the pulverized coal is ensured, the pressure in the gasification furnace is further ensured to be stable, potential safety hazards such as over-temperature and over-pressure, even furnace explosion and the like in the gasification furnace are avoided, and the safety production is ensured; the heat energy recovery is realized, and the resources are saved; the continuous feeding of the gasification furnace is ensured, and the production efficiency is improved.
Description
The technical field is as follows:
the utility model relates to a conveying system, in particular to use super supercritical carbon dioxide as fine coal conveying system who carries gas.
Background art:
at present, the feeding mode of a gasification furnace for producing coal gas can be divided into two types of coal water slurry feeding and pulverized coal feeding; in the process of pulverized coal gasification, pulverized coal pressurized dense-phase conveying is one of key technologies, and conveying gas of the pulverized coal pressurized dense-phase conveying generally adopts nitrogen or carbon dioxide gas; however, for coal chemical technologies such as oil-from-coal, gas-from-coal, methanol-from-coal, and the like, in order to make the content of effective gas in the synthesis gas higher, carbon dioxide gas is mostly used as the transport gas; however, as the pressure of the existing gasification furnace is gradually increased, the pressure of a pressurized dense-phase conveying system for conveying pulverized coal must be correspondingly increased, and the critical temperature and the pressure of the conventional carbon dioxide gas are 31.4 ℃ and 7.38MPa respectively; when the highest pressure of a pulverized coal high-pressure dense-phase conveying system reaches more than 7.4MPa, the temperature reaches more than 80 ℃, and the pulverized coal high-pressure dense-phase conveying system is in a supercritical range, carbon dioxide gas can generate phase change in the conveying process, the stability of pulverized coal conveying is seriously influenced, the pressure in a gasification furnace is further unstable, the conditions of over-temperature and over-pressure and even furnace explosion are easily caused, and great potential safety hazards exist; the pressure grade of the gasification furnace of the pulverized coal gasification technology is not improved all the time, and the development of the gasification furnace is severely restricted.
The utility model has the following contents:
an object of the utility model is to provide a relation of connection is simple, has guaranteed fine coal conveying stability, and has improved the fine coal conveying system who uses supercritical carbon dioxide as carrying gas of production efficiency.
The utility model discloses by following technical scheme implement: a pulverized coal conveying system taking supercritical carbon dioxide as conveying gas comprises a pulverized coal pipeline, a low-pressure storage tank, a plurality of variable-pressure lock hoppers, an additive storage tank, a high-pressure feed tank, a gasification furnace, a carbon dioxide storage tank and a supercritical carbon dioxide preparation system;
the discharge hole of the pulverized coal pipeline is communicated with the feed inlet of the low-pressure storage tank; the discharge hole of the low-pressure storage tank is respectively communicated with the feed hole of each pressure-variable lock hopper through a pipeline;
the discharge port of the additive storage tank is respectively communicated with the feed port of each pressure-variable lock hopper through a pipeline;
the additive in the additive storage tank mainly comprises a nonionic organic surfactant, and a part of anionic surfactant is added at the same time, wherein the nonionic organic surfactant is preferably of a polyhydric alcohol type, and the molecular weight is preferably 180-400; the water content of the additive is required to be less than or equal to 20 percent; adding a small amount of alkali liquor to ensure that the pH value of the additive is between 7.0 and 7.5; the additive can be completely dissolved in the supercritical carbon dioxide, and is not easy to separate out along with the change of pressure and temperature; the dosage of the additive is 0.05 to 1 percent (wt) of the pulverized coal, preferably 0.1 to 0.5 percent (wt); the additive is added into the mixture of the pulverized coal and the supercritical carbon dioxide, so that the stability of pulverized coal conveying is ensured;
the discharge hole of each pressure swing lock hopper is communicated with the feed inlet of the high-pressure feed tank through a pipeline; the discharge hole of the high-pressure feed tank is communicated with the feed inlet of the gasification furnace through a pipeline;
the gas outlet of the carbon dioxide storage tank is respectively communicated with the low-pressure storage tank and the gas inlet of the carbon dioxide compressor of the supercritical carbon dioxide preparation system;
and the gas outlet of the gas heater of the supercritical carbon dioxide preparation system is respectively communicated with the variable pressure lock hopper and the inlet of the high-pressure feed tank.
Further, it also includes a filter;
the air outlets of the low-pressure storage tank and the variable-pressure lock hopper are communicated with the air inlet of the filter through a pipeline; and the discharge hole of the filter is communicated with the feed inlet of the low-pressure storage tank through a pipeline.
Further, an air outlet of the carbon dioxide storage tank is communicated with a back flushing inlet of the filter through a pipeline.
Further, the supercritical carbon dioxide production system comprises the carbon dioxide compressor, a heat exchanger and the gas heater;
the gas outlet of the carbon dioxide compressor is communicated with the cold medium inlet of the heat exchanger through a pipeline; a cold medium outlet of the heat exchanger is communicated with a gas inlet of the gas heater through a pipeline;
and a heat medium inlet of the heat exchanger is communicated with a gas outlet of the gasification furnace through a pipeline.
Furthermore, a powder heater is arranged on a pipeline between the high-pressure feeding tank and the gasification furnace.
Further, the device also comprises a first material level sensor, a second material level sensor, a pressure sensor and a controller; the first material level sensor is arranged in the low-pressure storage tank; the second material level sensor and the pressure sensor are arranged in the pressure-variable lock hopper;
the pulverized coal pipeline is provided with the feeding valve; a first air inlet valve is arranged on a pipeline between the carbon dioxide storage tank and the low-pressure storage tank; a balance valve is arranged on an air vent pipeline between the filter and the low-pressure storage tank; a discharge valve is arranged on a discharging pipeline between the filter and the low-pressure storage tank;
a stop valve is arranged on a pipeline between the low-pressure storage tank and each pressure-variable lock hopper; a dosing valve is arranged on a pipeline between the additive storage tank and the pressure-variable lock hopper; a second air inlet valve is arranged on a pipeline between the gas heater and the pressure-variable lock hopper; an exhaust valve is arranged on a pipeline between the variable pressure lock hopper and the filter; a shut-off valve is arranged on a pipeline between the pressure-changing lock hopper and the high-pressure feed tank; the signal output ends of the first material level sensor, the second material level sensor and the pressure sensor are connected with the signal input end of the controller through signals; the signal output end of the controller is respectively in signal connection with the signal input ends of the feeding valve, the first air inlet valve, the balance valve, the discharge valve, the stop valve, the dosing valve, the second air inlet valve, the exhaust valve and the shutoff valve.
Further, a back flushing valve is arranged on a pipeline between the carbon dioxide storage tank and the filter; and the signal output end of the controller is in signal connection with the signal input end of the back flushing valve.
The utility model has the advantages that: 1. the system of the utility model has simple connection relation, easy realization and realization of automatic control function; in the using process, the supercritical carbon dioxide is used as conveying gas, is suitable for a pulverized coal conveying system with higher temperature and higher pressure, ensures the conveying stability of pulverized coal, further ensures the pressure stability in the gasification furnace, avoids potential safety hazards such as overtemperature and overpressure in the gasification furnace, even furnace explosion and the like, and ensures safe production; 2. in the process of preparing the supercritical carbon dioxide, the carbon dioxide gas compressed by the carbon dioxide compressor is heated into the supercritical carbon dioxide by the gas heater after absorbing the heat of the coal gas coming out of the gasification furnace, so that the heat of the coal gas is effectively absorbed, the heat energy recovery is realized, and the resources are saved; 3. the utility model discloses an automatic control function, and then guaranteed the continuous feed to the gasifier, improved production efficiency.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a control schematic diagram of the present invention.
The system comprises a pulverized coal pipeline 1, a low-pressure storage tank 2, a variable-pressure lock hopper 3, an additive storage tank 4, a high-pressure feeding tank 5, a gasification furnace 6, a carbon dioxide storage tank 7, a supercritical carbon dioxide preparation system 8, a carbon dioxide compressor 8.1, a heat exchanger 8.2, a gas heater 8.3, a filter 9, a first material level sensor 10, a second material level sensor 11, a pressure sensor 12, a controller 13, a feeding valve 14, a first air inlet valve 15, a balance valve 16, a discharge valve 17, a stop valve 18, a medicine adding valve 19, a second air inlet valve 20, an exhaust valve 21, a shut-off valve 22, a back-flushing valve 23 and a powder heater 24.
The specific implementation mode is as follows:
as shown in fig. 1-2, a pulverized coal conveying system using supercritical carbon dioxide as conveying gas comprises a pulverized coal pipeline 1, a low-pressure storage tank 2, two pressure-changing lock hoppers 3, an additive storage tank 4, a high-pressure feed tank 5, a gasification furnace 6, a carbon dioxide storage tank 7, a supercritical carbon dioxide preparation system 8, a filter 9, a first level sensor 10, a second level sensor 11, a pressure sensor 12 and a controller 13; the discharge hole of the pulverized coal pipeline 1 is communicated with the feed inlet of the low-pressure storage tank 2; the discharge hole of the low-pressure storage tank 2 is respectively communicated with the feed hole of each pressure-variable lock hopper 3 through a pipeline; the discharge port of the additive storage tank 4 is respectively communicated with the feed port of each pressure-variable lock hopper 3 through a pipeline; the additive in the additive storage tank 4 comprises 80% of a sorbitan ester disk (span-20) which is a nonionic organic surfactant, 10% of an anionic surfactant is added at the same time, the water content is 10%, the nonionic organic surfactant is preferably of a polyhydric alcohol type, and the molecular weight is preferably 180-400; and adding a trace amount of 48% (wt) alkali liquor to make the pH value of the additive between 7.2; the additive can be completely dissolved in the supercritical carbon dioxide, and is not easy to separate out along with the change of pressure and temperature; the dosage of the additive is 0.3 percent (wt) of the pulverized coal; the additive is added into the mixture of the pulverized coal and the supercritical carbon dioxide, so that the stability of pulverized coal conveying is ensured.
The discharge hole of each pressure-changing lock hopper 3 is communicated with the feed inlet of the high-pressure feed tank 5 through a pipeline; the discharge hole of the high-pressure feeding tank 5 is communicated with the feed hole of the gasification furnace 6 through a pipeline; the gas outlet of the carbon dioxide storage tank 7 is respectively communicated with the low-pressure storage tank 2 and the gas inlet of a carbon dioxide compressor 8.1 of the supercritical carbon dioxide preparation system 8; the gas outlet of the gas heater 8.3 of the supercritical carbon dioxide preparation system 8 is respectively communicated with the inlet of the pressure-changing lock hopper 3 and the inlet of the high-pressure feed tank 5.
The air outlets of the low-pressure storage tank 2 and the pressure-variable lock hopper 3 are communicated with the air inlet of the filter 9 through pipelines; the discharge hole of the filter 9 is communicated with the feed inlet of the low-pressure storage tank 2 through a pipeline. The air outlet of the carbon dioxide storage tank 7 is communicated with the back-blowing inlet of the filter 9 through a pipeline.
The supercritical carbon dioxide preparation system 8 comprises a carbon dioxide compressor 8.1, a heat exchanger 8.2 and a gas heater 8.3; the gas outlet of the carbon dioxide compressor 8.1 is communicated with the cold medium inlet of the heat exchanger 8.2 through a pipeline; a cold medium outlet of the heat exchanger 8.2 is communicated with a gas inlet of the gas heater 8.3 through a pipeline; the hot medium inlet of the heat exchanger 8.2 is communicated with the gas outlet of the gasification furnace 6 through a pipeline; the powder heater 24 is arranged on the pipeline between the high-pressure feed tank 5 and the gasification furnace 6, so that the phenomenon that the supercritical carbon dioxide is changed into gas-phase carbon dioxide due to the fact that the air temperature is reduced in the conveying process in winter or under the condition that the pipeline is long is avoided.
A first level sensor 10 is arranged in the low-pressure storage tank 2; a second material level sensor 11 and a pressure sensor 12 are arranged in the pressure-variable lock hopper 3; a feeding valve 14 is arranged on the pulverized coal pipeline 1; a first air inlet valve 15 is arranged on a pipeline between the carbon dioxide storage tank 7 and the low-pressure storage tank 2; a balance valve 16 is arranged on the vent pipeline between the filter 9 and the low-pressure storage tank 2; a discharge valve 17 is arranged on a discharging pipeline between the filter 9 and the low-pressure storage tank 2; a stop valve 18 is arranged on a pipeline between the low-pressure storage tank 2 and each pressure-variable lock hopper 3; a dosing valve 19 is arranged on a pipeline between the additive storage tank 4 and the pressure-variable lock hopper 3; a second air inlet valve 20 is arranged on a pipeline between the gas heater 8.3 and the pressure-changing lock bucket 3; an exhaust valve 21 is arranged on a pipeline between the pressure-changing lock hopper 3 and the filter 9; a shut-off valve 22 is arranged on a pipeline between the pressure-changing lock bucket 3 and the high-pressure feed tank 5, and a back-flushing valve 23 is arranged on a pipeline between the carbon dioxide storage tank 7 and the filter 9.
The signal output ends of the first material level sensor 10, the second material level sensor 11 and the pressure sensor 12 are connected with the signal input end of the controller 13 through signals; the signal output end of the controller 13 is respectively connected with the signal input ends of the feed valve 14, the first air inlet valve 15, the balance valve 16, the discharge valve 17, the stop valve 18, the dosing valve 19, the second air inlet valve 20, the exhaust valve 21, the shut-off valve 22 and the blowback valve 23 through signals.
The working process is as follows:
(1) low pressure tank 2 feed
The controller 13 controls the feed valve 14 and the balance valve 16 to be opened, the pulverized coal enters the low-pressure storage tank 2 through the pulverized coal pipeline 1, and the gas in the low-pressure storage tank 2 is filtered by the filter 9 and then is exhausted; the first material level sensor 10 feeds back a material height signal in the low-pressure storage tank 2 to the controller 13 at any time, when the monitored material level height reaches a highest set value, the controller 13 controls the feed valve 14 and the balance valve 16 to be closed, the first air inlet valve 15 is opened, and low-pressure carbon dioxide enters the low-pressure storage tank 2, so that the pulverized coal is in a fluidized state, and the phenomena of spontaneous combustion and bridging of the pulverized coal are avoided; when the monitored material level height reaches the lowest set value, the controller 13 controls the first air inlet valve 15 to be closed, and the balance valve 16 and the feeding valve 14 to be opened to feed materials into the low-pressure storage tank 2;
(2) feeding and discharging of variable pressure lock hopper 3
The second material level sensor 11 transmits the material level signal in the first pressure-variable lock hopper 3 to the controller 13 at any moment; when the monitored material level reaches the lowest set value, closing the shutoff valve 22, opening the exhaust valve 21, and then opening the stop valve 18 and the dosing valve 19 in a delayed manner; simultaneously, opening a corresponding shut-off valve 22 of the second pressure-changing lock hopper 3, and continuously feeding the materials into the high-pressure feeding tank 5; the carbon dioxide gas in the first pressure swing lock hopper 3 is discharged after being filtered by a filter 9; then the pulverized coal in the low-pressure storage tank 2 enters the first variable-pressure lock bucket 3 under the conveying of low-pressure carbon dioxide, the additive also enters the first variable-pressure lock bucket 3, when the monitored material level reaches the highest set value, the controller 13 controls the exhaust valve 21, the stop valve 18 and the dosing valve 19 to be closed, the second intake valve 20 is opened in a delayed mode, supercritical carbon dioxide is introduced into the first variable-pressure lock bucket 3 to charge the variable-pressure lock bucket 3, the pulverized coal is fluidized, the pressure sensor 12 detects the pressure in the first variable-pressure lock bucket 3 at any moment and transmits a signal to the controller 13, and when the pressure in the first variable-pressure lock bucket 3 reaches the set value; controlling the second air inlet valve 20 to close, waiting for the material level in the second pressure swing lock hopper 3 to be reduced to the lowest set value, controlling the closing valve 22 of the first pressure swing lock hopper 3 to open by the controller 13, closing the closing valve 22 of the second pressure swing lock hopper 3, and ensuring that the feeding process of the second pressure swing lock hopper 3 is the same as that of the first pressure swing lock hopper 3; the material is circularly fed in such a way, so that the continuous material feeding of the gasification furnace 6 is ensured, and the production efficiency is improved;
(3) gasifier 6 continuously feeds
Supercritical carbon dioxide is continuously fed into the high-pressure feeding tank 5, pulverized coal in the high-pressure feeding tank 5 is continuously fed into the gasification furnace 6, coal gas generated by the reaction of the gasification furnace 6 enters the heat exchanger 8.2 to exchange heat with the pressurized carbon dioxide gas, the heat of the coal gas is effectively absorbed, the heat energy recovery is realized, and resources are saved.
The supercritical carbon dioxide is used as the conveying gas, is suitable for a pulverized coal conveying system with higher temperature and higher pressure, ensures the conveying stability of pulverized coal, further ensures the pressure stability in the gasification furnace 6, avoids the potential safety hazards of overtemperature and overpressure, even furnace explosion and the like in the gasification furnace 6, and ensures the safety production
Carbon dioxide gas discharged by the pressure swing lock hopper 3 is filtered by a filter 9 and then is discharged to the air; the controller 13 opens the back-flushing valve 23 periodically to purge the pulverized coal on the filter element in the filter 9, so as to ensure the filtering effect of the filter 9; the controller 13 periodically controls the discharge valve 17 to be opened to feed the fine coal filtered by the filter 9 to the low-pressure storage tank 2.
The carbon dioxide is compressed by a carbon dioxide compressor 8.1 to improve the pressure of the carbon dioxide, then is preheated by a heat exchanger 8.2, and then is heated by a gas heater 8.3 to obtain supercritical carbon dioxide; the utility model discloses a system connection relation is simple, easily realizes to automatic control function has been realized.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A pulverized coal conveying system taking supercritical carbon dioxide as conveying gas is characterized by comprising a pulverized coal pipeline, a low-pressure storage tank, a plurality of variable pressure lock hoppers, an additive storage tank, a high-pressure feed tank, a gasification furnace, a carbon dioxide storage tank and a supercritical carbon dioxide preparation system;
the discharge hole of the pulverized coal pipeline is communicated with the feed inlet of the low-pressure storage tank; the discharge hole of the low-pressure storage tank is respectively communicated with the feed hole of each pressure-variable lock hopper through a pipeline;
the discharge port of the additive storage tank is respectively communicated with the feed port of each pressure-variable lock hopper through a pipeline;
the discharge hole of each pressure swing lock hopper is communicated with the feed inlet of the high-pressure feed tank through a pipeline; the discharge hole of the high-pressure feed tank is communicated with the feed inlet of the gasification furnace through a pipeline;
the gas outlet of the carbon dioxide storage tank is respectively communicated with the low-pressure storage tank and the gas inlet of the carbon dioxide compressor of the supercritical carbon dioxide preparation system;
and the gas outlet of the gas heater of the supercritical carbon dioxide preparation system is respectively communicated with the variable pressure lock hopper and the inlet of the high-pressure feed tank.
2. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 1, characterized by further comprising a filter;
the air outlets of the low-pressure storage tank and the variable-pressure lock hopper are communicated with the air inlet of the filter through a pipeline; and the discharge hole of the filter is communicated with the feed inlet of the low-pressure storage tank through a pipeline.
3. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 2, characterized in that the gas outlet of the carbon dioxide storage tank is communicated with the blowback inlet of the filter through a pipeline.
4. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 1, characterized in that the supercritical carbon dioxide preparation system comprises the carbon dioxide compressor, a heat exchanger and the gas heater;
the gas outlet of the carbon dioxide compressor is communicated with the cold medium inlet of the heat exchanger through a pipeline; a cold medium outlet of the heat exchanger is communicated with a gas inlet of the gas heater through a pipeline;
and a heat medium inlet of the heat exchanger is communicated with a gas outlet of the gasification furnace through a pipeline.
5. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 1, wherein a pulverized coal heater is provided on a pipeline between the high-pressure feed tank and the gasification furnace.
6. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 3, characterized by further comprising a first level sensor, a second level sensor, a pressure sensor and a controller; the first material level sensor is arranged in the low-pressure storage tank; the second material level sensor and the pressure sensor are arranged in the pressure-variable lock hopper;
a feeding valve is arranged on the pulverized coal pipeline; a first air inlet valve is arranged on a pipeline between the carbon dioxide storage tank and the low-pressure storage tank; a balance valve is arranged on an air vent pipeline between the filter and the low-pressure storage tank; a discharge valve is arranged on a discharging pipeline between the filter and the low-pressure storage tank;
a stop valve is arranged on a pipeline between the low-pressure storage tank and each pressure-variable lock hopper; a dosing valve is arranged on a pipeline between the additive storage tank and the pressure-variable lock hopper; a second air inlet valve is arranged on a pipeline between the gas heater and the pressure-variable lock hopper; an exhaust valve is arranged on a pipeline between the variable pressure lock hopper and the filter; a shut-off valve is arranged on a pipeline between the pressure-changing lock hopper and the high-pressure feed tank;
the signal output ends of the first material level sensor, the second material level sensor and the pressure sensor are connected with the signal input end of the controller through signals; the signal output end of the controller is respectively in signal connection with the signal input ends of the feeding valve, the first air inlet valve, the balance valve, the discharge valve, the stop valve, the dosing valve, the second air inlet valve, the exhaust valve and the shutoff valve.
7. The pulverized coal conveying system using supercritical carbon dioxide as conveying gas as claimed in claim 6, characterized in that a blowback valve is arranged on a pipeline between the carbon dioxide storage tank and the filter; and the signal output end of the controller is in signal connection with the signal input end of the back flushing valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686267A (en) * | 2022-03-22 | 2022-07-01 | 新奥科技发展有限公司 | Conveying device and conveying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686267A (en) * | 2022-03-22 | 2022-07-01 | 新奥科技发展有限公司 | Conveying device and conveying method |
| CN114686267B (en) * | 2022-03-22 | 2023-11-17 | 新奥科技发展有限公司 | Conveying device and conveying method |
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