CN109370661B - Coal slurry pressurizing pneumatic feeding system and method - Google Patents
Coal slurry pressurizing pneumatic feeding system and method Download PDFInfo
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- CN109370661B CN109370661B CN201811554813.XA CN201811554813A CN109370661B CN 109370661 B CN109370661 B CN 109370661B CN 201811554813 A CN201811554813 A CN 201811554813A CN 109370661 B CN109370661 B CN 109370661B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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Abstract
The invention discloses a coal slurry pressurization pneumatic feeding system and a coal slurry pressurization pneumatic feeding method, wherein the system comprises a control module, a coal slurry storage tank mechanism and a pneumatic pressurization mechanism, the coal slurry storage tank mechanism comprises a low-pressure coal slurry pump of a low-pressure coal slurry storage tank and a high-pressure coal slurry storage tank, the pneumatic pressurization mechanism comprises a gas compressor, a gas source storage tank and a pressure relief tank, the control module comprises a controller, and the input end of the controller is connected with a liquid level sensor group, a pressure sensor group, a flow sensor group and a gas supply flow sensor; the method comprises the following steps: firstly, compressing and storing an air source; secondly, storing the coal slurry and conveying the coal slurry at low pressure; thirdly, pneumatically pressurizing and conveying the coal slurry; and fourthly, feeding gas raw materials. The coal slurry pump has the advantages of reasonable design, high-pressure coal slurry delivery by utilizing the pressurized gas, elimination of pulse generated by a mechanical delivery mode of a high-pressure coal slurry pump, improvement of the accuracy of coal slurry metering, equipment investment cost saving and strong practicability.
Description
Technical Field
The invention belongs to the technical field of coal slurry feeding, and particularly relates to a coal slurry pressurizing pneumatic feeding system and a coal slurry pressurizing pneumatic feeding method.
Background
Coal gasification and natural gas conversion are the main processes for producing synthesis gas in modern chemical industry. The coal gasification process has more and less carbon and less hydrogen, and is rich in heat, the natural gas conversion process has more and less hydrogen and needs to consume heat, the natural gas is conveyed by adopting a gas compression feeding mode according to the characteristics of coal gasification and natural gas conversion, the coal slurry is conveyed by adopting a pumping mode, and due to the problem of self design of a pump, flow pulse can be generated when different cylinder bodies are switched, so that the accurate measurement of a flowmeter is influenced. Meanwhile, due to the characteristics of high body height, viscosity and high abrasion of the coal slurry, the high requirement on a diaphragm of the pump is met, the increase of the pressure of the pump is restricted, the increase of the conveying pressure of the coal slurry is also restricted, and the increase of the gasification pressure of the device is restricted.
Under the condition of mechanical pressurization, most of high-pressure coal slurry pumps used at present at home are imported abroad, so that the feeding period is long, and the cost is high.
Therefore, a coal slurry pressurizing pneumatic feeding system and a coal slurry pressurizing pneumatic feeding method which are simple in structure and reasonable in design are lacked at present, pressurized gas is used for pressurizing and conveying coal slurry, the pressurized gas is used for replacing a high-pressure coal slurry pump for conveying the coal slurry, and equipment investment cost is saved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a coal slurry pressurizing pneumatic feeding system aiming at the defects in the prior art, which has the advantages of simple structure and reasonable design, utilizes pressurizing gas to pressurize and convey coal slurry, eliminates pulses generated by a mechanical conveying mode of a high-pressure coal slurry pump, improves the accuracy of coal slurry metering, utilizes the pressurizing gas to replace the high-pressure coal slurry pump to convey the coal slurry, saves equipment investment cost, is easy for large-scale industrial application, and has strong practicability.
In order to solve the technical problems, the invention adopts the technical scheme that: a coal slurry pressurized pneumatic feeding system is characterized in that: the system comprises a control module, a coal slurry storage tank mechanism and a pneumatic pressurizing mechanism for pressurizing the coal slurry storage tank mechanism, wherein the coal slurry storage tank mechanism and the pneumatic pressurizing mechanism are both connected with a gasification furnace;
the coal slurry storage tank mechanism comprises a low-pressure coal slurry storage tank, a low-pressure coal slurry pump connected with the low-pressure coal slurry storage tank and a high-pressure coal slurry storage tank connected with the low-pressure coal slurry pump, wherein a liquid inlet of the high-pressure coal slurry storage tank is provided with a feed valve, a liquid outlet of the high-pressure coal slurry storage tank is provided with a discharge valve, a gas switch valve is arranged at a gas inlet of the high-pressure coal slurry storage tank, and the number of the high-pressure coal slurry storage tanks is at least two;
the pneumatic pressurization mechanism comprises a gas compressor, a gas source storage tank connected with an outlet of the gas compressor and a pressure relief tank connected with an inlet of the gas compressor, a liquid outlet of the high-pressure coal slurry storage tank is connected with the gasification furnace through a coal slurry conveying pipe, a discharge valve is positioned on the coal slurry conveying pipe, a pressure relief pipe connected with the pressure relief tank is arranged on the high-pressure coal slurry storage tank, a pressure relief valve is arranged on the pressure relief pipe, the gas source storage tank is connected with the high-pressure coal slurry storage tank through a coal slurry pressurization gas pipe, the gas source storage tank is connected with the gasification furnace through a gasification gas inlet pipe, and a gas switch valve is positioned on the coal slurry pressurization gas pipe;
the control module comprises a controller, and the low-pressure coal slurry pump, the feed valve, the discharge valve and the gas switch valve are controlled by the controller. The input termination of controller has been used for detecting the liquid level sensor group of liquid level in the high pressure coal slurry storage tank, is used for detecting pressure sensor group of high pressure coal slurry storage tank internal pressure, is used for detecting the flow sensor group of the flow of the liquid outlet of high pressure coal slurry storage tank and is used for detecting the air supply flow sensor of air supply storage tank for the gasifier air feed.
The coal slurry pressurized pneumatic feeding system is characterized in that: the coal slurry conveying pipe comprises an A coal slurry conveying pipe connected between a liquid outlet of the A high-pressure coal slurry storage tank and the gasification furnace and a B coal slurry conveying pipe connected between a liquid outlet of the B high-pressure coal slurry storage tank and the gasification furnace.
The coal slurry pressurized pneumatic feeding system is characterized in that: the feed valve is including setting up the A feed valve at the inlet of A high-pressure coal slurry storage tank and setting up the B feed valve at the inlet of B high-pressure coal slurry storage tank, liquid level sensor group is including setting up the A level sensor on A high-pressure coal slurry storage tank and setting up the B level sensor on B high-pressure coal slurry storage tank, the output of A level sensor and B level sensor all with the input of controller meets, A feed valve and B feed valve are controlled by the controller.
The coal slurry pressurized pneumatic feeding system is characterized in that: the bleeder valve is including setting up the A bleeder valve at the liquid outlet of A high-pressure coal slurry storage tank and setting up the B bleeder valve at the liquid outlet of B high-pressure coal slurry storage tank, flow sensor group is including setting up A flow sensor on the A coal slurry conveyer pipe is in with setting up B flow sensor on the B coal slurry conveyer pipe, A flow sensor and B flow sensor's output with the input of controller meets, A bleeder valve and B bleeder valve are controlled by the controller.
The coal slurry pressurized pneumatic feeding system is characterized in that: the coal slurry pressurizing gas pipe comprises a coal slurry pressurizing gas pipe A arranged between the gas source storage tank and the coal slurry high-pressure storage tank A and a coal slurry pressurizing gas pipe B arranged between the gas source storage tank and the coal slurry high-pressure storage tank B, and the gas switch valve comprises a gas switch valve A arranged on the coal slurry pressurizing gas pipe A and a gas switch valve B arranged on the coal slurry pressurizing gas pipe B;
the pressure sensor group comprises an A pressure sensor arranged on the A high-pressure coal slurry storage tank and a B pressure sensor arranged on the B high-pressure coal slurry storage tank, the output ends of the A pressure sensor and the B pressure sensor are connected with the input end of the controller, and the A gas switch valve and the B gas switch valve are controlled by the controller.
Meanwhile, the invention also discloses a coal slurry pressurizing pneumatic feeding method which is simple in method steps, reasonable in design and good in using effect, and is characterized by comprising the following steps:
step one, compressing and storing an air source:
pressurizing gas outside the battery compartment or gas returned by the pressure relief tank through a gas compressor, and then entering a gas source storage tank for storage, wherein the gas is used as a gasification raw material or a pressurization power source;
step two, coal slurry storage and low-pressure conveying:
step 201, preparing coal slurry by using a coal mill, storing the prepared coal slurry in a low-pressure coal slurry storage tank, controlling the opening of a feed valve by a controller, controlling a low-pressure coal slurry pump to work by the controller, and sending the coal slurry in the low-pressure coal slurry storage tank to the high-pressure coal slurry storage tank through a low-pressure coal slurry pump;
202, in the process that the coal slurry in the low-pressure coal slurry storage tank is sent to the high-pressure coal slurry storage tank through a low-pressure coal slurry pump, detecting the liquid level in the high-pressure coal slurry storage tank by a liquid level sensor group to obtain the liquid level of the high-pressure coal slurry storage tank, and sending the liquid level to a controller;
step 203, comparing the obtained liquid level of the high-pressure coal slurry storage tank with a normal liquid level set value by the controller, and controlling the feed valve to be closed by the controller when the liquid level of the high-pressure coal slurry storage tank obtained by the controller accords with the normal liquid level set value, and simultaneously controlling the low-pressure coal slurry pump to stop working by the controller;
step three, coal slurry pneumatic pressurization and conveying:
301, controlling the gas switch valve to be opened by a controller, and boosting the pressure of the high-pressure coal slurry storage tank;
step 302, in the process of boosting the high-pressure coal slurry storage tank, detecting the pressure in the high-pressure coal slurry storage tank by a pressure sensor group to obtain the pressure of the high-pressure coal slurry storage tank, and sending the pressure to a controller;
step 303, comparing the obtained pressure of the high-pressure coal slurry storage tank with a normal pressure set value by the controller, and maintaining the pressure of the high-pressure coal slurry storage tank when the pressure of the high-pressure coal slurry storage tank obtained by the controller meets a coal slurry conveying pressure set value;
304, controlling the high-pressure coal slurry in the A high-pressure coal slurry storage tank to be delivered to a gasification furnace through the A coal slurry delivery pipe by the controller through the discharge valve; the pressure of the A high-pressure coal slurry storage tank is maintained at a coal slurry conveying pressure set value;
305, in the process that the high-pressure coal slurry in the A high-pressure coal slurry storage tank is conveyed to the gasification furnace through the A coal slurry conveying pipe, detecting the liquid level in the A high-pressure coal slurry storage tank by a liquid level sensor group to obtain the liquid level of the A high-pressure coal slurry storage tank, and sending the liquid level to a controller, comparing the obtained liquid level of the A high-pressure coal slurry storage tank with a low liquid level set value by the controller, controlling the high-pressure coal slurry in the B high-pressure coal slurry storage tank to be conveyed to the gasification furnace through the B coal slurry conveying pipe by the controller through a discharging valve when the liquid level of the A high-pressure coal slurry storage tank detected by the liquid level sensor group is lower than the low liquid level set value, keeping the continuity of the feeding of the gasification furnace; the pressure of the high-pressure coal slurry storage tank B is maintained at a coal slurry conveying pressure set value;
step four, feeding gas raw materials:
step 401, delivering pressurized gas in a gas source storage tank to the gasification furnace through a gasification gas inlet pipe;
step 402, in the process of conveying pressurized gas to the gasification furnace, a gas supply flow sensor detects the flow in the gasification gas inlet pipe and sends the flow to a controller, so that the flow in the gasification gas inlet pipe meets a gas supply flow set value, and the gasification furnace is maintained to continuously perform conversion reaction.
The above method is characterized in that: after the controller controls the a high-pressure coal slurry storage tank to stop conveying the slurry in step 305, the following steps are performed:
step A, a controller controls the A high-pressure coal slurry storage tank to reduce the pressure through the pressure relief valve until the pressure of the A high-pressure coal slurry storage tank detected by a pressure sensor group reaches 0.1-0.2 MPa, the controller controls the A high-pressure coal slurry storage tank to stop reducing the pressure, and in the process of reducing the pressure of the A high-pressure coal slurry storage tank, pressurized gas in the A high-pressure coal slurry storage tank is sent to a gas compressor through a pressure relief tank to be recycled;
b, controlling the feed valve to add coal slurry into the A high-pressure coal slurry storage tank by the controller until the liquid level of the A high-pressure coal slurry storage tank in the A high-pressure coal slurry storage tank meets a normal liquid level set value;
and step C, according to the methods from step 301 to step 303, boosting the liquid level of the high-pressure coal slurry storage tank A and maintaining the pressure.
The above method is characterized in that: in the step 305, in the process that the high-pressure coal slurry in the B high-pressure coal slurry storage tank is conveyed to the gasification furnace through the B coal slurry conveying pipe, the following steps are carried out:
the method comprises the steps that a liquid level sensor group detects the liquid level in a B high-pressure coal slurry storage tank to obtain the liquid level of the B high-pressure coal slurry storage tank, the liquid level sensor group sends the liquid level to a controller, the controller compares the obtained liquid level of the B high-pressure coal slurry storage tank with a low liquid level set value, when the liquid level of the B high-pressure coal slurry storage tank detected by a liquid level sensor group is lower than the low liquid level set value, the controller controls high-pressure coal slurry in the A high-pressure coal slurry storage tank to be sent to a gasification furnace through an A coal slurry conveying pipe under the condition that the A high-pressure coal slurry storage tank finishes adding, boosting and pressure maintaining, the continuity of the gasification furnace feeding is kept, and then the controller controls the B high-pressure;
the controller controls the B high-pressure coal slurry storage tank to reduce the pressure through the pressure relief valve until the pressure of the B high-pressure coal slurry storage tank detected by the pressure sensor group reaches 0.1-0.2 MPa, the controller controls the B high-pressure coal slurry storage tank to stop reducing the pressure, and in the process of reducing the pressure of the B high-pressure coal slurry storage tank, pressurized gas in the B high-pressure coal slurry storage tank is sent to a gas compressor through the pressure relief tank to be recycled;
the controller controls the feed valve to add coal slurry into the B high-pressure coal slurry storage tank until the liquid level of the B high-pressure coal slurry storage tank in the B high-pressure coal slurry storage tank meets a normal liquid level set value;
and step (3) according to the method from step (301) to step (303), boosting and maintaining the pressure of the B high-pressure coal slurry storage tank to realize the alternate coal slurry transportation of the A high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank.
The above method is characterized in that: in the first step, the gas outside the boundary area is natural gas, industrial waste gas containing hydrocarbon or carbon dioxide.
The above method is characterized in that: the normal liquid level set value is 20% -95% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, and the low liquid level set value is 2% -18% of the height of the straight cylinder section in the high-pressure coal slurry storage tank;
the set value of the coal slurry conveying pressure is 0.5MPa to 13.2 MPa;
in step 303, the pressure of the A high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank is maintained for 2 to 5 seconds;
in step 402, the set value of the gas supply flow is 0.5-2 times of the set value of the coal slurry flow.
Compared with the prior art, the invention has the following advantages:
1. the coal slurry pressurizing pneumatic feeding system is simple in structure, reasonable in design, simple and convenient to install and arrange and low in investment cost.
2. The pneumatic pressurizing mechanism in the adopted coal slurry pressurizing pneumatic feeding system can pressurize the high-pressure coal slurry storage tank, pressurized gas is used for pressurizing and conveying the coal slurry, pulses generated by a mechanical conveying mode of a high-pressure coal slurry pump are eliminated, the accuracy of coal slurry metering is improved, in addition, the pressurized gas is used for replacing the high-pressure coal slurry pump for conveying the coal slurry, and the equipment investment cost is saved.
3. The pressure relief tank in the coal slurry pressurization pneumatic feeding system is used for delivering pressurized gas in the high-pressure coal slurry storage tank to a gas compressor for recycling through the pressure relief tank when the high-pressure coal slurry storage tank is depressurized.
4. The pneumatic pressurizing mechanism is used for pressurizing the high-pressure coal slurry storage tank to convey coal slurry in the high-pressure coal slurry storage tank to the gasification furnace, and is used for enabling pressurized gas to be gas containing hydrocarbon to enter the gasification furnace from the side face of the gasification furnace in two layers when the pressurized gas is gas containing hydrocarbon, gasification reaction is carried out by utilizing heat generated by coal gasification, and the yield of synthesis gas is improved.
5. Because the mechanical feeding of traditional high pressure coal stuff pump need switch the use between different cylinder bodies, can produce the undulant of pulsed to the coal stuff material feeding, influence the accuracy of the measurement of coal stuff flow, in order to eliminate this drawback, high pressure coal stuff pump often adopts multi-cylinder body design at present, and the cylinder body is more, and is less to the influence of flow pulse, but the cylinder body figure grow, and the design of high pressure coal stuff pump is more complicated, and the cost is also higher. The pneumatic pressurizing mechanism is used for pneumatically feeding the coal slurry, the coal slurry feeding is linear under the condition of constant pressure of the high-pressure coal slurry storage tank, the coal slurry feeding continuity in the pipeline is good, the flow pulse is basically eliminated, and the accuracy of slurry feeding metering is improved.
6. The liquid level sensor group, the pressure sensor group, the flow sensor group and the gas supply flow sensor are respectively used for sending the liquid level, the pressure, the coal slurry flow and the gas supply flow of the high-pressure coal slurry storage tank to the controller, so that the liquid level, the pressure, the coal slurry flow and the gas supply flow of the high-pressure coal slurry storage tank meet the feeding requirement, and the coal slurry feeding continuity in the pipeline is good.
7. The adopted coal slurry pressurizing pneumatic feeding method has simple steps, convenient realization and simple and convenient operation, and realizes the continuous conveying of the coal slurry in the gasification furnace.
8. The adopted coal slurry pressurizing pneumatic feeding method is simple and convenient to operate and good in using effect, firstly, air source compression and storage are carried out, secondly, coal slurry storage and low-pressure conveying are carried out, then, a pneumatic pressurizing mechanism is adopted to carry out pressure boosting and pressure maintaining on the high-pressure coal slurry storage tank, and the coal slurry in the high-pressure coal slurry storage tank is conveyed to the gasification furnace; and then the pressurized gas in the gas source storage tank is sent to the gasification furnace through the gasification gas inlet pipe, so that the gasification furnace is ensured to continuously perform conversion reaction, and the operation cost of enterprises is saved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of the configuration of a coal slurry pressurized pneumatic feed system of the present invention.
FIG. 2 is a schematic block diagram of the electrical circuit of the coal slurry pressurized pneumatic feed system of the present invention.
FIG. 3 is a block flow diagram of a coal slurry pressurized pneumatic feed process of the present invention.
Description of reference numerals:
1-a gas compressor; 2-an air source storage tank; 3, a coal mill;
4-low pressure coal slurry storage tank; 5-low pressure coal slurry pump; 6-A high-pressure coal slurry storage tank;
7-B high-pressure coal slurry storage tank; 8, gasifying a furnace; 9-pressure relief tank;
10-a gas switching valve; 11-B gas switching valve; 12-a controller;
14-a pressure sensor; 15-B pressure sensor;
16-a feed valve; 17-B feed valve; 18-a relief valve;
19-B relief valve; 20-a discharge valve; 21-B discharge valve;
22-a level sensor; 23-B level sensor; 24-a flow sensor;
25-B flow sensor; and 26, an air supply flow sensor.
Detailed Description
As shown in fig. 1 and 2, the coal slurry pressurizing pneumatic feeding system includes a control module, a coal slurry storage tank mechanism and a pneumatic pressurizing mechanism for pressurizing the coal slurry storage tank mechanism, wherein the coal slurry storage tank mechanism and the pneumatic pressurizing mechanism are both connected with a gasification furnace 8;
the coal slurry storage tank mechanism comprises a low-pressure coal slurry storage tank 4, a low-pressure coal slurry pump 5 connected with the low-pressure coal slurry storage tank 4 and a high-pressure coal slurry storage tank connected with the low-pressure coal slurry pump 5, wherein a liquid inlet of the high-pressure coal slurry storage tank is provided with a feed valve, a liquid outlet of the high-pressure coal slurry storage tank is provided with a discharge valve, an air inlet of the high-pressure coal slurry storage tank is provided with an air switch valve, and the number of the high-pressure coal slurry storage tanks is at least two;
the pneumatic pressurization mechanism comprises a gas compressor 1, a gas source storage tank 2 connected with an outlet of the gas compressor 1 and a pressure relief tank 9 connected with an inlet of the gas compressor 1, wherein a liquid outlet of the high-pressure coal slurry storage tank is connected with the gasification furnace 8 through a coal slurry conveying pipe, a discharge valve is positioned on the coal slurry conveying pipe, a pressure relief pipe connected with the pressure relief tank 9 is arranged on the high-pressure coal slurry storage tank, a pressure relief valve is arranged on the pressure relief pipe, the gas source storage tank 2 is connected with the high-pressure coal slurry storage tank through a coal slurry pressurization gas pipe, the gas source storage tank 2 is connected with the gasification furnace 8 through a gasification gas inlet pipe, and a gas switch valve is positioned on the coal slurry pressurization gas pipe;
the control module comprises a controller 12, and the low-pressure coal slurry pump 5, the feed valve, the discharge valve and the gas switch valve are controlled by the controller 12. The input termination of controller 12 is used for detecting the liquid level sensor group of liquid level in the high pressure coal slurry storage tank, is used for detecting the pressure sensor group of high pressure coal slurry storage tank internal pressure, is used for detecting the flow sensor group of the flow of the liquid outlet of high pressure coal slurry storage tank and is used for detecting air supply flow sensor 26 of air supply storage tank 2 for gasifier 8 air feed.
In this embodiment, the number of the high-pressure coal slurry storage tanks is two, two the high-pressure coal slurry storage tanks are respectively a high-pressure coal slurry storage tank 6 and a high-pressure coal slurry storage tank B7, the coal slurry conveying pipe includes an a coal slurry conveying pipe connected between a liquid outlet of the a high-pressure coal slurry storage tank 6 and the gasification furnace 8 and a B coal slurry conveying pipe connected between a liquid outlet of the B high-pressure coal slurry storage tank 7 and the gasification furnace 8.
In this embodiment, the feed valve includes an a feed valve 16 disposed at a liquid inlet of the a high-pressure coal slurry storage tank 6 and a B feed valve 17 disposed at a liquid inlet of the B high-pressure coal slurry storage tank 7, the liquid level sensor group includes an a liquid level sensor 22 disposed on the a high-pressure coal slurry storage tank 6 and a B liquid level sensor 23 disposed on the B high-pressure coal slurry storage tank 7, output ends of the a liquid level sensor 22 and the B liquid level sensor 23 are connected to an input end of the controller 12, and the a feed valve 16 and the B feed valve 17 are controlled by the controller 12.
In this embodiment, in the actual use process, a level sensor 22 and B level sensor 23 are PDS463 level sensors, a flow sensor 24 and B flow sensor 25 are coal slurry electromagnetic flowmeters, and air supply flow sensor 26 is a QX-L UX series gas flowmeter, and has the advantages of strong function, convenient installation, automatic temperature and pressure compensation, and improved accuracy of flow measurement.
In this embodiment, the bleeder valve includes an a bleeder valve 20 arranged at the liquid outlet of the a high-pressure coal slurry storage tank 6 and a B bleeder valve 21 arranged at the liquid outlet of the B high-pressure coal slurry storage tank 7, the flow sensor group includes an a flow sensor 24 arranged on the a coal slurry conveying pipe and a B flow sensor 25 arranged on the B coal slurry conveying pipe, the output ends of the a flow sensor 24 and the B flow sensor 25 are connected with the input end of the controller 12, and the a bleeder valve 20 and the B bleeder valve 21 are controlled by the controller 12.
In this embodiment, the coal slurry pressurizing gas pipe includes a coal slurry pressurizing gas pipe a arranged between the gas source storage tank 2 and the coal slurry storage tank 6 a, and a coal slurry pressurizing gas pipe B arranged between the gas source storage tank 2 and the coal slurry storage tank 7B, and the gas switch valve includes a gas switch valve a 10 arranged on the coal slurry pressurizing gas pipe a and a gas switch valve B11 arranged on the coal slurry pressurizing gas pipe B;
the pressure sensor group comprises an A pressure sensor 14 arranged on the A high-pressure coal slurry storage tank 6 and a B pressure sensor 15 arranged on the B high-pressure coal slurry storage tank 7, the output ends of the A pressure sensor 14 and the B pressure sensor 15 are connected with the input end of the controller 12, and the A gas switch valve 10 and the B gas switch valve 11 are controlled by the controller 12.
In this embodiment, the gas compressor 1 is a VW-2.5/3-250 compressor.
In this embodiment, the low-pressure coal slurry storage tank 4 is firstly arranged to be connected with the coal mill 3, so as to be convenient for storing the coal slurry prepared by the coal mill 3; secondly, the low-pressure coal slurry pump 5 can convey coal slurry to a plurality of high-pressure coal slurry storage tanks conveniently, so that the coal slurry in the high-pressure coal slurry storage tanks can be rapidly added, and the requirement of alternate feeding of the high-pressure coal slurry storage tanks is met; thirdly, because the low-pressure coal slurry pump 5 has lower cost, the low-pressure coal slurry pump 5 is matched with the low-pressure coal slurry storage tank 4, so that the coal slurry can be conveyed and the flow of the coal slurry can be ensured; fourthly, the system needs to add coal slurry to a plurality of high-pressure coal slurry storage tanks, and the direct supply cannot meet the supply of the plurality of high-pressure coal slurry storage tanks without the buffer of the low-pressure coal slurry storage tank 4.
In this embodiment, adopt pneumatic pressurization mechanism, firstly consider that traditional high-pressure coal stuff pump machinery feeding because need switch the use between different cylinder bodies, can produce pulsed fluctuation to the coal thick liquid material feeding, influence the accuracy of the measurement of coal thick liquid flow, in order to eliminate this drawback, current high-pressure coal stuff pump often adopts multi-cylinder body design, and the cylinder body is more, and influence to the flow pulse is less, but the cylinder body figure grow, and the design of high-pressure coal stuff pump is more complicated, and the cost is also higher. The pneumatic pressurizing mechanism is used for pneumatically feeding the coal slurry, the coal slurry feeding is linear under the condition of constant pressure of the high-pressure coal slurry storage tank, the coal slurry feeding continuity in the pipeline is good, the flow pulse is basically eliminated, and the accuracy of slurry feeding metering is improved; secondly, considering the coal slurry transportation by adopting a high-pressure coal slurry pump, the coal slurry can be deposited at the root of a diaphragm in the high-pressure coal slurry pump, so that the diaphragm is abraded, once the high-pressure coal slurry pump fails, the high-pressure coal slurry pump must be stopped urgently, and the normal continuous operation cannot be ensured; thirdly, most of the high-pressure coal slurry pumps used at home are imported abroad, so that the feeding period is long and the cost is high; fourthly, because the coal slurry has the characteristics of high viscosity and high abrasion, the high requirement on a diaphragm of the pump restricts the pressure rise of the pump, and also restricts the conveying pressure rise of the coal slurry, thereby restricting the gasification pressure rise of the device.
A method of pressurized pneumatic feeding of coal slurry as shown in fig. 3, comprising the steps of:
step one, compressing and storing an air source:
pressurizing gas outside the battery compartment or gas returned by the pressure relief tank 9 through a gas compressor 1, and then entering a gas source storage tank 2 for storage, wherein the gas is used as a gasification raw material or a pressurization power source;
step two, coal slurry storage and low-pressure conveying:
step 201, preparing coal slurry by using a coal mill 3, storing the prepared coal slurry in a low-pressure coal slurry storage tank 4, controlling a feed valve A16 and a feed valve B17 to be opened by a controller 12, controlling a low-pressure coal slurry pump 5 to work by the controller 12, and sending the coal slurry in the low-pressure coal slurry storage tank 4 to a high-pressure coal slurry storage tank A6 and a high-pressure coal slurry storage tank B7 through the low-pressure coal slurry pump 5;
step 202, in the process that the coal slurry in the low-pressure coal slurry storage tank 4 is sent to the A high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 through the low-pressure coal slurry pump 5, the A liquid level sensor 22 detects the liquid level in the A high-pressure coal slurry storage tank 6 to obtain the liquid level of the A high-pressure coal slurry storage tank and sends the liquid level to the controller 12, and the B liquid level sensor 23 detects the liquid level in the B high-pressure coal slurry storage tank 7 to obtain the liquid level of the B high-pressure coal slurry storage tank and sends the liquid level to the controller 12;
step 203, the controller 12 compares the obtained liquid levels of the A high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank with a normal liquid level set value respectively, when the liquid levels of the A high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank obtained by the controller 12 meet the normal liquid level set value, the controller 12 controls the A feed valve 16 and the B feed valve 17 to be closed, and meanwhile, the controller 12 controls the low-pressure coal slurry pump 5 to stop working;
step three, coal slurry pneumatic pressurization and conveying:
step 301, the controller 12 controls the gas switch valve A10 and the gas switch valve B11 to be opened, and the pressure of the high-pressure coal slurry storage tank A6 and the high-pressure coal slurry storage tank B7 is increased;
step 302, in the process of boosting the pressure of the a high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7, the a pressure sensor 14 detects the pressure in the a high-pressure coal slurry storage tank 6 to obtain the pressure of the a high-pressure coal slurry storage tank and sends the pressure of the a high-pressure coal slurry storage tank to the controller 12, and the B pressure sensor 15 detects the pressure in the B high-pressure coal slurry storage tank 7 to obtain the pressure of the B high-pressure coal slurry storage tank and sends the pressure of the B high-pressure coal slurry storage tank to the controller;
step 303, the controller 12 compares the obtained pressure of the a high-pressure coal slurry storage tank and the obtained pressure of the B high-pressure coal slurry storage tank with a normal pressure set value respectively, and maintains the pressure of the a high-pressure coal slurry storage tank 6 and the pressure of the B high-pressure coal slurry storage tank 7 when the pressure of the a high-pressure coal slurry storage tank and the pressure of the B high-pressure coal slurry storage tank obtained by the controller 12 meet the coal slurry conveying pressure set value;
step 304, the controller 12 controls the discharge valve 20A to be opened, and the high-pressure coal slurry in the high-pressure coal slurry storage tank A is conveyed to the gasification furnace 8 through the coal slurry conveying pipe A; the pressure of the A high-pressure coal slurry storage tank is maintained at a coal slurry conveying pressure set value;
305, in the process that the high-pressure coal slurry in the A high-pressure coal slurry storage tank is conveyed to the gasification furnace 8 through the A coal slurry conveying pipe, the A liquid level sensor 22 detects the liquid level in the A high-pressure coal slurry storage tank 6 to obtain the liquid level of the A high-pressure coal slurry storage tank, and sends the liquid level to the controller 12, the controller 12 compares the obtained liquid level of the A high-pressure coal slurry storage tank with a low liquid level set value, when the liquid level of the A high-pressure coal slurry storage tank detected by the A liquid level sensor 22 is lower than the low liquid level set value, the controller 12 controls the B discharging valve 21 to be opened, the high-pressure coal slurry in the B high-pressure coal slurry storage tank is conveyed to the gasification furnace 8 through the B coal slurry conveying pipe, the continuity of the feeding of the gasification furnace 8 is kept, then, the controller 12 controls the A discharging; the pressure of the high-pressure coal slurry storage tank B is maintained at a coal slurry conveying pressure set value;
step four, feeding gas raw materials:
step 401, delivering the pressurized gas in the gas source storage tank 2 to the gasification furnace 8 through a gasification gas inlet pipe;
step 402, in the process of delivering the pressurized gas to the gasification furnace 8, the gas supply flow sensor 26 detects the flow in the gasification gas inlet pipe and sends the detected flow to the controller 12, so that the flow in the gasification gas inlet pipe meets the gas supply flow set value, and the gasification furnace 8 is maintained to continuously perform the conversion reaction.
In this embodiment, after the controller 12 controls the a high-pressure coal slurry storage tank 6 to stop conveying the slurry in step 305, the following steps are performed:
step A, the controller 12 controls the pressure relief valve 18A to be opened, the pressure of the high-pressure coal slurry storage tank A is reduced until the pressure of the high-pressure coal slurry storage tank A detected by the pressure sensor 14A reaches 0.1 MPa-0.2 MPa, the controller 12 controls the pressure relief valve 18A to be closed, the pressure reduction of the high-pressure coal slurry storage tank A is stopped, and in the process of reducing the pressure of the high-pressure coal slurry storage tank A, the pressurized gas in the high-pressure coal slurry storage tank A is sent to the gas compressor 1 through the pressure relief tank 9 to be recycled;
step B, the controller 12 controls the A feed valve 16 to be opened, and coal slurry is added into the A high-pressure coal slurry storage tank 6 until the liquid level of the A high-pressure coal slurry storage tank in the A high-pressure coal slurry storage tank 6 meets a normal liquid level set value;
and step C, according to the methods from step 301 to step 303, boosting the liquid level of the high-pressure coal slurry storage tank A and maintaining the pressure.
In this embodiment, in the step 305, in the process that the high-pressure coal slurry in the B high-pressure coal slurry storage tank is sent to the gasification furnace 8 through the B coal slurry conveying pipe, the following steps are performed:
step one, a B liquid level sensor 23 detects the liquid level in a B high-pressure coal slurry storage tank 7 to obtain the liquid level of the B high-pressure coal slurry storage tank, the liquid level is sent to a controller 12, the controller 12 compares the obtained liquid level of the B high-pressure coal slurry storage tank with a low liquid level set value, when the liquid level of the B high-pressure coal slurry storage tank detected by the B liquid level sensor 23 is lower than the low liquid level set value, the controller 12 controls an A discharge valve 20 to be opened under the condition that coal slurry is added, boosted and pressure-maintained in an A high-pressure coal slurry storage tank 6, the high-pressure coal slurry in the A high-pressure coal slurry storage tank is sent to a gasification furnace 8 through an A coal slurry conveying pipe, the continuity of the feeding of the gasification furnace 8 is kept, and then the controller;
step two, the controller 12 controls the B pressure release valve 19 to open, the B high-pressure coal slurry storage tank 7 is subjected to pressure reduction until the pressure of the B high-pressure coal slurry storage tank detected by the B pressure sensor 15 reaches 0.1-0.2 MPa, the controller 12 controls the B pressure release valve 19 to close, the B high-pressure coal slurry storage tank 7 stops pressure reduction, and in the process of pressure reduction of the B high-pressure coal slurry storage tank, pressurized gas in the B high-pressure coal slurry storage tank is sent to the gas compressor 1 through the pressure release tank 9 to be recycled;
step B, the controller 12 controls the feed valve 17 of the B to be opened, and coal slurry is added into the B high-pressure coal slurry storage tank 7 until the liquid level of the B high-pressure coal slurry storage tank in the B high-pressure coal slurry storage tank 7 meets a normal liquid level set value;
and step C, according to the methods from step 301 to step 303, boosting and maintaining the pressure of the B high-pressure coal slurry storage tank 7 to realize the alternate coal slurry transportation of the A high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7.
In this embodiment, the gas outside the boundary area in the first step is natural gas, industrial waste gas containing hydrocarbon, or carbon dioxide.
In this embodiment, the normal liquid level setting value is 20% to 95% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, and the low liquid level setting value is 2% to 18% of the height of the straight cylinder section in the high-pressure coal slurry storage tank;
the set value of the coal slurry conveying pressure is 0.5MPa to 13.2 MPa;
in step 303, the pressure of the A high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 is maintained for 2 to 5 seconds;
in step 402, the set value of the gas supply flow is 0.5-2 times of the set value of the coal slurry flow.
In this embodiment, in the process that the high-pressure coal slurry in the high-pressure coal slurry storage tank 6 a in step 304 is delivered to the gasification furnace 8 through the coal slurry delivery pipe a, the flow sensor 24 detects the flow rate in the coal slurry delivery pipe a, and sends the detected flow rate of the coal slurry delivery pipe a to the controller 12, so that the flow sensor 24 detects that the flow rate of the coal slurry delivery pipe a meets the coal slurry flow rate set value; in the process that the high-pressure coal slurry in the B high-pressure coal slurry storage tank 7 is delivered to the gasification furnace 8 through the B coal slurry delivery pipe in step 305, the B flow sensor 25 detects the flow rate in the B coal slurry delivery pipe, and sends the detected flow rate of the B coal slurry delivery pipe to the controller 12, so that the B flow sensor 25 detects that the flow rate of the B coal slurry delivery pipe meets the coal slurry flow rate set value.
In the embodiment, the coal slurry flow rate set value is 2500 kg/h-3000 kg/h.
In this embodiment, it should be noted that the coal slurry flow rate set value is a coal slurry mass flow rate set value.
In this embodiment, the reason why the normal liquid level setting value is 20% to 95% of the height of the straight cylinder section in the high-pressure coal slurry storage tank is that the normal liquid level setting value is lower than 20% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, on one hand, the normal liquid level setting value cannot supply coal slurry required by the gasification furnace 8 and cannot effectively perform gasification reaction; on the other hand, the A high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 need to be switched alternately ceaselessly, so that the vaporization effect is influenced; in addition, the set value of the normal liquid level is more than 95% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, on one hand, because more coal slurry is in the high-pressure coal slurry storage tank, precipitation and silting are easy to occur, the coal slurry has poor fluidity and is inconvenient to discharge; on the other hand, when the pressurizing pneumatic mechanism pressurizes the high-pressure coal slurry storage tank, the coal slurry in the high-pressure coal slurry storage tank overflows to cause blockage of an air inlet and a pressure relief opening, and the coal slurry overflows to cause pollution to the high-pressure coal slurry storage tank and a construction site, so that the normal and stable operation of the high-pressure coal slurry storage tank cannot be ensured.
In this embodiment, the reason why the low liquid level setting value is 2% to 18% of the height of the straight cylinder section in the high-pressure coal slurry storage tank is that if the low liquid level setting value is lower than 2% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, on one hand, the switching between the a high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 cannot be satisfied, and the continuous supply of the coal slurry in the pipeline cannot be effectively ensured; on the other hand, the phenomenon that the pressure in the gasification furnace 8 is too high due to the fact that the pressurized gas enters the gasification furnace 8 along with the coal slurry when the coal slurry in the high-pressure coal slurry storage tank is discharged is avoided; in addition, the set value of the low liquid level is greater than 18% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, so that the coal slurry in the high-pressure coal slurry storage tank cannot be fully discharged, the switching times between the A high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 are increased, and the energy consumption is high.
In this embodiment, the set value of the coal slurry delivery pressure is 0.5MPa to 13.2MPa, because if the set value of the coal slurry delivery pressure is less than 0.5MPa, the flow of the coal slurry cannot be effectively promoted, the fluidity is poor, the coal slurry delivery is slow until the coal slurry cannot continuously and uniformly enter the gasification furnace 8, and if the set value of the coal slurry delivery pressure is greater than 13.2MPa, on one hand, the requirement on the pressure bearing capacity of the coal slurry delivery pipeline is high, the equipment cost is high, on the other hand, the flow of the coal slurry is large, so that the impact on the pipeline is large, and the pipeline is easily corroded. In addition, the aim is to meet the reaction requirement of the gasification furnace 8 as much as possible and avoid the flow velocity of the coal slurry from being too small or too large.
In the embodiment, the set value of the gas supply flow is 0.5-2 times of the set value of the coal slurry flow, and the adjustment of the carbon-hydrogen ratio in the synthesis gas is considered. In addition, the gas supply flow is too low, sensible heat generated by coal gasification cannot be reasonably utilized, the energy utilization efficiency of the system is reduced, the gas supply flow is too high, and the gasification temperature is greatly reduced due to the fact that a large amount of heat is absorbed by the conversion reaction.
In this embodiment, the pressure of the a high-pressure coal slurry storage tank 6 and the B high-pressure coal slurry storage tank 7 is maintained for 2 to 5 seconds, and firstly, the discharge valve is opened after the pressure in the a high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank is ensured to be stable, so that the coal slurry in the a high-pressure coal slurry storage tank or the B high-pressure coal slurry storage tank can uniformly flow, and the coal slurry flow in the a high-pressure coal slurry storage tank or the B high-pressure coal slurry storage tank is ensured to meet the requirement of a coal slurry flow set value; secondly, whether the pressure in the A high-pressure coal slurry storage tank and the B high-pressure coal slurry storage tank can be maintained at the coal slurry conveying pressure set value or not is verified, and the accuracy of pneumatic pressurization is ensured.
In this embodiment, in the first step, the gas outside the battery compartment or the gas returned from the pressure relief tank 9 is pressurized to 6.0MPa to 8.0MPa by the gas compressor 1.
In the present embodiment, the reason why the pressurized gas is pressurized to 6.0 to 8.0MPa by the gas compressor 1 is that the pressurized gas is easily transported to the high-pressure coal slurry storage tank, and the pressurized gas is transported to the gasification furnace for gasification reaction.
In conclusion, the coal slurry pump has reasonable design, pressurized gas is used for pressurized conveying of the coal slurry, pulses generated by a mechanical conveying mode of a high-pressure coal slurry pump are eliminated, the accuracy of coal slurry metering is improved, the pressurized gas is used for replacing the high-pressure coal slurry pump for coal slurry conveying, the equipment investment cost is saved, the large-scale industrial application is easy, and the practicability is high.
In the present embodiment, the above description is only a preferred embodiment of the present invention, and does not limit the present invention, and any simple modification, change and equivalent structural change made on the above embodiment according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (6)
1. A coal slurry pressurization pneumatic feeding method adopts a system comprising a control module, a coal slurry storage tank mechanism and a pneumatic pressurization mechanism for pressurizing the coal slurry storage tank mechanism, wherein the coal slurry storage tank mechanism and the pneumatic pressurization mechanism are both connected with a gasification furnace (8);
the coal slurry storage tank mechanism comprises a low-pressure coal slurry storage tank (4), a low-pressure coal slurry pump (5) connected with the low-pressure coal slurry storage tank (4) and a high-pressure coal slurry storage tank connected with the low-pressure coal slurry pump (5), wherein a liquid inlet of the high-pressure coal slurry storage tank is provided with a feed valve, a liquid outlet of the high-pressure coal slurry storage tank is provided with a discharge valve, and a gas inlet of the high-pressure coal slurry storage tank is provided with a gas switch valve;
the pneumatic pressurization mechanism comprises a gas compressor (1), a gas source storage tank (2) connected with an outlet of the gas compressor (1) and a pressure relief tank (9) connected with an inlet of the gas compressor (1), wherein a liquid outlet of the high-pressure coal slurry storage tank is connected with the gasification furnace (8) through a coal slurry conveying pipe, a discharge valve is positioned on the coal slurry conveying pipe, a pressure relief pipe connected with the pressure relief tank (9) is arranged on the high-pressure coal slurry storage tank, a pressure relief valve is arranged on the pressure relief pipe, the gas source storage tank (2) is connected with the high-pressure coal slurry storage tank through a coal slurry pressurization gas pipe, the gas source storage tank (2) is connected with the gasification furnace (8) through a gasification gas inlet pipe, and a gas switch valve is positioned on the coal slurry pressurization gas pipe;
the coal slurry conveying pipe comprises an A coal slurry conveying pipe connected between a liquid outlet of the A high-pressure coal slurry storage tank (6) and the gasification furnace (8) and a B coal slurry conveying pipe connected between a liquid outlet of the B high-pressure coal slurry storage tank (7) and the gasification furnace (8);
control module includes controller (12), low pressure slurry pump (5) the feed valve the bleeder valve with the gas switch valve is controlled by controller (12), the input termination of controller (12) is used for detecting the liquid level sensor group of liquid level in the high pressure slurry storage tank, be used for detecting the pressure sensor group of high pressure slurry storage tank internal pressure, be used for detecting the flow sensor group of the flow of the liquid outlet of high pressure slurry storage tank and be used for detecting air supply storage tank (2) is air feed flow sensor (26) of gasifier (8) air feed, its characterized in that:
step one, compressing and storing an air source:
pressurizing gas outside the battery compartment or gas returned by the pressure relief tank (9) through a gas compressor (1) and then entering a gas source storage tank (2) for storage, wherein the gas is used as a gasification raw material or a pressurization power source;
step two, coal slurry storage and low-pressure conveying:
step 201, preparing coal slurry by using a coal mill (3), storing the prepared coal slurry in a low-pressure coal slurry storage tank (4), controlling the opening of a feed valve by a controller (12), controlling a low-pressure coal slurry pump (5) to work by the controller (12), and conveying the coal slurry in the low-pressure coal slurry storage tank (4) to the high-pressure coal slurry storage tank by a low-pressure coal slurry pump (5);
202, in the process that the coal slurry in the low-pressure coal slurry storage tank (4) is sent to the high-pressure coal slurry storage tank through a low-pressure coal slurry pump (5), a liquid level sensor group detects the liquid level in the high-pressure coal slurry storage tank to obtain the liquid level of the high-pressure coal slurry storage tank, and the liquid level is sent to a controller (12);
step 203, the controller (12) compares the obtained liquid level of the high-pressure coal slurry storage tank with a normal liquid level set value, when the liquid level of the high-pressure coal slurry storage tank obtained by the controller (12) meets the normal liquid level set value, the controller (12) controls the feed valve to be closed, and meanwhile, the controller (12) controls the low-pressure coal slurry pump (5) to stop working;
step three, coal slurry pneumatic pressurization and conveying:
step 301, a controller (12) controls the gas switch valve to be opened to boost the pressure of the high-pressure coal slurry storage tank;
step 302, in the process of boosting the high-pressure coal slurry storage tank, detecting the pressure in the high-pressure coal slurry storage tank by a pressure sensor group to obtain the pressure of the high-pressure coal slurry storage tank, and sending the pressure to a controller (12);
step 303, comparing the obtained pressure of the high-pressure coal slurry storage tank with a normal pressure set value by the controller (12), and maintaining the pressure of the high-pressure coal slurry storage tank when the pressure of the high-pressure coal slurry storage tank obtained by the controller (12) meets a coal slurry conveying pressure set value;
304, controlling the high-pressure coal slurry in the A high-pressure coal slurry storage tank to be delivered to the gasification furnace (8) through the A coal slurry delivery pipe by the controller (12) through the discharge valve; the pressure of the A high-pressure coal slurry storage tank is maintained at a coal slurry conveying pressure set value;
305, in the process that high-pressure coal slurry in the A high-pressure coal slurry storage tank is conveyed to the gasification furnace (8) through the A coal slurry conveying pipe, a liquid level sensor group detects the liquid level in the A high-pressure coal slurry storage tank (6) to obtain the liquid level of the A high-pressure coal slurry storage tank, the liquid level sensor group sends the liquid level of the A high-pressure coal slurry storage tank to a controller (12), the controller (12) compares the obtained liquid level of the A high-pressure coal slurry storage tank with a low liquid level set value, when the liquid level of the A high-pressure coal slurry storage tank detected by a liquid level sensor group is lower than a low liquid level set value, the controller (12) controls high-pressure coal slurry in the B high-pressure coal slurry storage tank to be conveyed to the gasification furnace (8) through the B coal slurry conveying pipe through the discharging valve, the feeding continuity of the gasification furnace (8; the pressure of the high-pressure coal slurry storage tank B is maintained at a coal slurry conveying pressure set value;
step four, feeding gas raw materials:
step 401, delivering the pressurized gas in the gas source storage tank (2) to the gasification furnace (8) through a gasification gas inlet pipe;
step 402, in the process of conveying pressurized gas to the gasification furnace (8), detecting the flow in the gasification gas inlet pipe by a gas supply flow sensor (26), and sending the flow to a controller (12) to enable the flow in the gasification gas inlet pipe to meet a gas supply flow set value, so as to maintain the gasification furnace (8) to continuously perform conversion reaction;
the normal liquid level set value is 20% -95% of the height of the straight cylinder section in the high-pressure coal slurry storage tank, and the low liquid level set value is 2% -18% of the height of the straight cylinder section in the high-pressure coal slurry storage tank;
the set value of the coal slurry conveying pressure is 0.5MPa to 13.2 MPa;
in the step 303, the pressure of the A high-pressure coal slurry storage tank (6) and the B high-pressure coal slurry storage tank (7) is maintained for 2 to 5 seconds;
in the step 402, the set value of the gas supply flow is 0.5-2 times of the set value of the coal slurry flow;
in the first step, the gas outside the boundary area is natural gas, industrial waste gas containing hydrocarbon or carbon dioxide.
2. A coal slurry pressurized pneumatic feed method as defined in claim 1 wherein: the feed valve is including setting up A feed valve (16) at the inlet of A high pressure coal slurry storage tank (6) and setting up B feed valve (17) at the inlet of B high pressure coal slurry storage tank (7), the liquid level sensor group is including setting up A level sensor (22) on A high pressure coal slurry storage tank (6) and setting up B level sensor (23) on B high pressure coal slurry storage tank (7), the output of A level sensor (22) and B level sensor (23) all with the input of controller (12) meets, A feed valve (16) and B feed valve (17) are controlled by controller (12).
3. A coal slurry pressurized pneumatic feed method as defined in claim 1 wherein: the discharge valve is including setting up A bleeder valve (20) at the liquid outlet of A high-pressure coal slurry storage tank (6) and setting up B bleeder valve (21) at the liquid outlet of B high-pressure coal slurry storage tank (7), the flow sensor group is including setting up A flow sensor (24) on the A coal slurry conveyer pipe and setting are in B flow sensor (25) on the B coal slurry conveyer pipe, the output of A flow sensor (24) and B flow sensor (25) with the input of controller (12) meets, A bleeder valve (20) and B bleeder valve (21) are controlled by controller (12).
4. A coal slurry pressurized pneumatic feed method as defined in claim 1 wherein: the coal slurry pressurizing gas pipe comprises a coal slurry pressurizing gas pipe A arranged between the gas source storage tank (2) and the coal slurry storage tank A (6) and a coal slurry pressurizing gas pipe B arranged between the gas source storage tank (2) and the coal slurry storage tank B (7), and the gas switch valve comprises a gas switch valve A (10) arranged on the coal slurry pressurizing gas pipe A and a gas switch valve B (11) arranged on the coal slurry pressurizing gas pipe B;
the pressure sensor group comprises an A pressure sensor (14) arranged on the A high-pressure coal slurry storage tank (6) and a B pressure sensor (15) arranged on the B high-pressure coal slurry storage tank (7), the output ends of the A pressure sensor (14) and the B pressure sensor (15) are connected with the input end of the controller (12), and the A gas switch valve (10) and the B gas switch valve (11) are controlled by the controller (12).
5. A coal slurry pressurized pneumatic feed method as defined in claim 1 wherein: in the step 305, after the controller (12) controls the A high-pressure coal slurry storage tank (6) to stop conveying slurry, the following steps are carried out:
step A, a controller (12) controls the A high-pressure coal slurry storage tank to reduce the pressure through the pressure relief valve until the pressure of the A high-pressure coal slurry storage tank detected by a pressure sensor group reaches 0.1-0.2 MPa, the controller (12) controls the A high-pressure coal slurry storage tank (6) to stop reducing the pressure, and in the process of reducing the pressure of the A high-pressure coal slurry storage tank, pressurized gas in the A high-pressure coal slurry storage tank is sent to a gas compressor (1) through a pressure relief tank (9) to be recycled;
step B, the controller (12) controls the feed valve to add coal slurry into the A high-pressure coal slurry storage tank (6) until the liquid level of the A high-pressure coal slurry storage tank in the A high-pressure coal slurry storage tank (6) meets a normal liquid level set value;
and step C, according to the methods from step 301 to step 303, boosting the liquid level of the high-pressure coal slurry storage tank A and maintaining the pressure.
6. A coal slurry pressurized pneumatic feed method as defined in claim 5 wherein: in the step 305, in the process that the high-pressure coal slurry in the B high-pressure coal slurry storage tank is conveyed to the gasification furnace (8) through the B coal slurry conveying pipe, the following steps are carried out:
the method comprises the steps that (A) a liquid level sensor group detects the liquid level in a B high-pressure coal slurry storage tank (7) to obtain the liquid level of the B high-pressure coal slurry storage tank, the liquid level is sent to a controller (12), the controller (12) compares the obtained liquid level of the B high-pressure coal slurry storage tank with a low liquid level set value, when the liquid level of the B high-pressure coal slurry storage tank detected by the liquid level sensor group is lower than the low liquid level set value, the controller (12) controls high-pressure coal slurry in the A high-pressure coal slurry storage tank to be sent to a gasification furnace (8) through an A coal slurry conveying pipe under the condition that the A high-pressure coal slurry storage tank (6) completes coal slurry adding, boosting and pressure maintaining, the feeding continuity of the gasification furnace (8) is kept, and then the controller (12) controls the B high-pressure coal slurry;
step two, the controller (12) controls the B high-pressure coal slurry storage tank (7) to reduce the pressure through the pressure relief valve until the pressure of the B high-pressure coal slurry storage tank detected by the pressure sensor group reaches 0.1-0.2 MPa, the controller (12) controls the B high-pressure coal slurry storage tank (7) to stop reducing the pressure, and in the process of reducing the pressure of the B high-pressure coal slurry storage tank, the pressurized gas in the B high-pressure coal slurry storage tank is sent to the gas compressor (1) through the pressure relief tank (9) to be recycled;
step three, the controller (12) controls the feed valve to add coal slurry into the B high-pressure coal slurry storage tank (7) until the liquid level of the B high-pressure coal slurry storage tank in the B high-pressure coal slurry storage tank (7) meets a normal liquid level set value;
and step four, according to the method from the step 301 to the step 303, boosting and maintaining the pressure of the B high-pressure coal slurry storage tank (7) to realize the alternate coal slurry transportation of the A high-pressure coal slurry storage tank (6) and the B high-pressure coal slurry storage tank (7).
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| CN1553078A (en) * | 2003-05-26 | 2004-12-08 | 邓立新 | Boosting slurry-supply system for combusting water coal slurry |
| CN205917223U (en) * | 2016-08-29 | 2017-02-01 | 江苏江泰能源科技有限公司 | Gasification is with preparation system of coal slurry |
| CN106995724A (en) * | 2017-05-09 | 2017-08-01 | 北京清创晋华科技有限公司 | A kind of system and method that water-gas is prepared with oven gas and water-coal-slurry |
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| CN1553078A (en) * | 2003-05-26 | 2004-12-08 | 邓立新 | Boosting slurry-supply system for combusting water coal slurry |
| CN205917223U (en) * | 2016-08-29 | 2017-02-01 | 江苏江泰能源科技有限公司 | Gasification is with preparation system of coal slurry |
| CN106995724A (en) * | 2017-05-09 | 2017-08-01 | 北京清创晋华科技有限公司 | A kind of system and method that water-gas is prepared with oven gas and water-coal-slurry |
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