Low-consumption and energy-saving needle coke production device

Abstract

The utility model relates to a low-consumption and energy-saving needle coke production device which comprises a coal bed gas tank, a fuel tank and a needle coke kiln, the coal bed gas tank is communicated with a coal bed gas main pipeline through a coal bed gas inlet pipeline, the fuel tank is communicated with the coal bed gas tank through a pressure reducing and stabilizing pipeline, and the fuel tank provides fuel for the needle coke kiln through a fuel pipeline; an electric regulating valve is arranged on the pressure reducing and stabilizing pipeline, a first pressure transmitter is arranged on the fuel tank, and the electric regulating valve and the first pressure transmitter are both in circuit connection with the PID valve position controller; the electric adjusting valve on the pressure reducing and stabilizing pipeline is matched with the PID valve position controller, so that the air pressure in the fuel tank is smaller than that in the coal bed gas tank, and the gas pressure in the fuel tank tends to be dynamically stable. The device can provide fuel with stable pressure for the needle coke kiln, utilizes coal bed gas to replace coke oven gas, does not use high-power coal gas pressurizing equipment (coal gas compressor), and can greatly reduce the production cost of the coal-based needle coke.

Description

TECHNICAL FIELD

[0001] The utility model relates to needle coke production technical field especially a low -consumption energy -conserving needle coke production device. BACKGROUND

[0002] Needle coke can be divided into oil-based needle coke and coal-based needle coke, and the needle coke produced by using petroleum residue as raw material is oil-based needle coke, and the needle coke produced by using coal tar pitch and its distillate as raw material is coal-based needle coke.

[0003] In the domestic needle coke production device, because coal-based needle coke is a downstream industry of the coking plant, and coke oven gas is one of the most important by-products of the coking plant, due to the industrial cluster effect, the production fuel of coal-based needle coke is generally selected as coke oven gas.

[0004] Specifically, in the coking plant, several bituminous coals are used to prepare coking coal, and coke and tar products are produced at the same time when the coking coal is subjected to high-temperature dry distillation in a coking oven; the coal tar pitch is mainly processed from the coal tar produced in the coking process, and the coal tar pitch is the raw material for the production of coal-based needle coke; the main components of coke oven gas are hydrogen and methane, accounting for 56% and 27% respectively, and the coke oven gas is usually collected by a dust collector during the coking process.

[0005] However, because the coke oven gas is usually collected by a dust collector, the pressure of the coke oven gas is low and difficult to meet the needs of the device, and the needle coke device is equipped with a coal gas pressurizing equipment (coal gas compressor), so that the pressure of the coke oven gas is increased from about 5 kPa to several hundred kPa, and the pressure of the coke oven gas is increased by tens of times to meet the operation needs of the needle coke device. Because the power of the coal gas pressurizing equipment (coal gas compressor) is high, and the coal gas compressor needs circulating water for heat exchange and cooling, nitrogen and instrument air, and the water, electricity and gas energy consumption cost during the operation of the coal gas compressor, and the monthly maintenance cost of the coal gas compressor, the operation cost is high, and the overall production cost is high.

[0006] In addition, the coal raw material required by the coking plant is produced by coal mines, and the coal and coalbed methane in the coal mine often coexist in the same geological body, and the exploitation pressure of the coalbed methane is high, and the reservoir pressure is usually up to 0.5 MPa to tens of MPa, and the average conveying pressure after exploitation is up to several MPa to tens of MPa.

[0007] Moreover, due to the industrial cluster effect, and the coal mine, the coking plant and the coal-based needle coke production plant belong to the same industrial chain, and the three are usually located in the same region, and even the three often belong to the same group of affiliated industries, and the overall use cost of the coalbed methane is low, so the related feasibility scheme of using the coalbed methane instead of the coke oven gas as the production fuel of the coal-based needle coke gradually begins to be applied in the production device of the coal-based needle coke. INVENTION CONTENTS

[0008] In view of the defects or deficiencies in the prior art, the low-consumption and energy-saving needle coke production device aims to solve the above-mentioned problems existing in the prior art.

[0009] In order to solve the above-mentioned problems, the low-consumption and energy-saving needle coke production device comprises a coal bed gas tank, a fuel tank and a needle coke furnace, the coal bed gas tank is communicated with a coal bed gas main pipeline through a coal bed gas inlet pipeline, the fuel tank is communicated with the coal bed gas tank through a pressure reducing and stabilizing pipeline, and the fuel tank provides fuel for the needle coke furnace through a fuel pipeline; an electric regulating valve is arranged on the pressure reducing and stabilizing pipeline, a first pressure transmitter is arranged on the fuel tank, and the electric regulating valve and the first pressure transmitter are both connected with a PID valve position controller circuit; the electric regulating valve on the pressure reducing and stabilizing pipeline cooperates with the PID valve position controller, so that the gas pressure in the fuel tank is less than the gas pressure in the coal bed gas tank, and the gas pressure in the fuel tank tends to be dynamically stable.

[0010] The low-consumption and energy-saving needle coke production device provided by the utility model further has the following technical features:

[0011] Further, the maximum gas flow rate of the pressure reducing and stabilizing pipeline is greater than the maximum gas flow rate of the fuel pipeline.

[0012] Further, the utility model further includes a coke oven gas tank, the coke oven gas tank is communicated with the fuel tank through a gas pipeline, and a piston type gas pump is arranged on the gas pipeline to deliver coke oven gas to the fuel tank.

[0013] Further, the gas pipeline is provided with a gas cut-off valve on both sides of the piston type gas pump.

[0014] Further, a pressure relief pipeline is further arranged between the coke oven gas tank and the fuel tank, and a pressure relief valve is arranged on the pressure relief pipeline.

[0015] Further, the coke oven gas tank is connected to a coke oven gas collecting device through a coke oven pipeline, and a gas collection cut-off valve is arranged on the coke oven pipeline.

[0016] Further, a first coal bed gas cut-off valve is arranged on the coal bed gas inlet pipeline close to the coal bed gas tank.

[0017] Further, a second pressure transmitter and a third pressure transmitter are arranged on both sides of the first coal bed gas cut-off valve, and the second pressure transmitter, the third pressure transmitter and the first coal bed gas cut-off valve are all connected with a PLC valve position controller circuit.

[0018] Further, a second coal bed gas cut-off valve is arranged between the electric regulating valve on the pressure reducing and stabilizing pipeline and the fuel tank.

[0019] Further, a fuel regulating valve is arranged on the fuel pipeline.

[0020] The low-consumption and energy-saving needle coke production device has the advantages that the low-consumption and energy-saving needle coke production device can provide fuel with stable pressure for a needle coke furnace, and can greatly reduce the production cost of coal-based needle coke by using coal bed gas to replace coke oven gas and stopping using high-power gas pressurizing equipment (a gas compressor). BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole schematic view of the low-consumption and energy-saving needle coke production device.

[0022] In the drawing, the reference signs are:

[0023] The coal bed gas tank 10, the coal bed gas inlet pipeline 11, the first coal bed gas cut-off valve 12, the second pressure transmitter 13, the third pressure transmitter 14, and the PLC valve position controller 15.

[0024] The fuel tank 20, the pressure reduction and pressure stabilization pipeline 21, the electric regulating valve 22, the first pressure transmitter 23, the PID valve position controller 24, and the second coal bed gas cut-off valve 25.

[0025] The coke oven gas tank 30, the gas pipeline 31, the piston type gas conveying pump 32, the gas cut-off valve 33, the pressure relief pipeline 34, the pressure relief valve 35, the coke oven pipeline 36, the gas collection cut-off valve 37, and the coke oven gas collection device 38.

[0026] The needle coke furnace 40, the fuel pipeline 41, the fuel regulating valve 42, DETAILED DESCRIPTION

[0027] Hereinafter, the utility model will be described in detail with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0028] As Figure 1 shown in the embodiment of the low-consumption and energy-saving needle coke production device of the utility model, the low-consumption and energy-saving needle coke production device comprises a coal bed gas tank 10, a fuel tank 20, and a needle coke furnace 40, the coal bed gas tank 10 receives coal bed gas and conveys the coal bed gas to the fuel tank 20, and the fuel tank 20 provides fuel for the needle coke furnace 40.

[0029] The coal bed gas tank 10 is communicated with the coal bed gas main pipeline through the coal bed gas inlet pipeline 11, specifically, an opening is formed on the coal bed gas main pipeline, and then the coal bed gas is introduced into the coal bed gas tank 10 through the coal bed gas inlet pipeline 11, so as to facilitate the subsequent use of the needle coke production device; as a supply source of the coal bed gas, the pressure of the coal bed gas on the coal bed gas main pipeline can usually reach several megapascals, which is much higher than the fuel pressure required by the needle coke furnace 40, so that the pressure in the coal bed gas tank 10 can reach the fuel pressure required by the needle coke furnace 40 without the need of a pressurizing device (such as a compressor).

[0030] The fuel tank 20 is communicated with the coalbed gas tank 10 and serves as a transfer tank, and the fuel tank 20 stores the coalbed gas from the coalbed gas tank 10 after pressure reduction and pressure stabilization, so that the fuel tank 20 has a relatively stable fuel pressure for supplying the needle coke furnace 40, and specifically, the fuel tank 20 provides fuel for the needle coke furnace 40 through the fuel pipeline 41.

[0031] Specifically, the fuel tank 20 is communicated with the coalbed gas tank 10 through the pressure reduction and pressure stabilization pipeline 21, the pressure reduction and pressure stabilization pipeline 21 is provided with an electric regulating valve 22, and the fuel tank 20 is provided with a first pressure transmitter 23; the electric regulating valve 22 and the first pressure transmitter 23 are both circuit-connected with a PID valve position controller 24; wherein, as prior art, the principle of the PID valve position controller 24 is briefly described as follows: the PID (Proportion Integration Differentiation) controller compares the collected data (such as the value collected by the first pressure transmitter 23) with a reference value (i.e. a set value), and then uses the difference to calculate a new input value, and the purpose of the new input value is to make the data of the system reach or maintain the reference value; in the embodiment, the PID valve position controller 24 compares and calculates the reference value (i.e. the set value) and the pressure value of the fuel tank 20 collected by the first pressure transmitter 23, continuously adjusts the valve scale of the electric regulating valve 22, so that the flow rate from the coalbed gas tank 10 into the fuel tank 20 is continuously changed, so that the gas pressure in the fuel tank 20 tends to a dynamic stable value, i.e. the reference value (set value), and the fuel pressure value in the fuel tank 20 after passing through the fuel pipeline 41 can reach the required fuel pressure value of the needle coke furnace 40. Therefore, the electric regulating valve 22 on the pressure reduction and pressure stabilization pipeline 21 and the PID valve position controller 24 can cooperate to make the gas pressure in the fuel tank 20 tend to be dynamically stable, and by setting the reference value (i.e. the set value) of the PID valve position controller 24, the gas pressure in the fuel tank 20 can be less than the gas pressure in the coalbed gas tank 10.

[0032] The low-consumption and energy-saving needle coke production device can provide fuel with stable pressure for the needle coke furnace 30, and can greatly reduce the production cost of coal-based needle coke by using coalbed gas to replace coke oven gas and stopping the use of high-power coal gas pressurizing equipment (coal gas compressor).

[0033] In actual production application, the coal gas pressure is increased from about 5 kPa to several hundred kPa, the pressure is increased by tens of times, the operating power of the coal gas compressor is generally 210 KW, and the water, electricity and gas energy consumption cost of the coal gas compressor during operation is about 5000 yuan per day, the energy consumption cost is about 150,000 yuan per month, in addition, according to the maintenance convention, the coal gas compressor needs to be maintained once a month, and the maintenance cost is 10,000 yuan each time. By replacing the coke oven gas with the coal bed gas, the coal gas compressor is stopped, the operation and maintenance cost of the coal gas compressor is saved, about 160,000 yuan per month can be saved, and nearly 2 million yuan of production cost can be saved per year.

[0034] In an embodiment of the present application, preferably, the maximum gas flow rate of the pressure reduction and stabilization pipeline 21 is greater than the maximum gas flow rate of the fuel pipeline 41; in this way, while the fuel tank 20 is delivering fuel to the needle coke furnace 40, the coal bed gas tank 10 can timely supplement sufficient coal bed gas into the fuel tank 20 to keep the pressure in the fuel tank 20 stable.

[0035] In an embodiment of the present application, preferably, the fuel adjusting valve 42 is arranged on the fuel pipeline 41, in this way, the combustion power in the needle coke furnace 40 can be adjusted according to the opening scale of the fuel adjusting valve 42 to adapt to the needs of needle coke production.

[0036] In an embodiment of the present application, preferably, the coke oven gas tank 30 is further included, the coke oven gas tank 30 is connected with the fuel tank 20 through the gas pipeline 31, and the piston type gas delivery pump 32 is arranged on the gas pipeline 31 to deliver the coke oven gas to the fuel tank 20; according to the current situation in China, for example, in 2010, 85 billion m3 of coke oven gas was left over in China except that 40% to 45% of the coke oven gas was used to ensure the temperature of the coking furnace, which exceeds the total heat value of the West-East Gas Transmission Project, and how to use the remaining coke oven gas efficiently is a problem that has puzzled coking enterprises for many years, therefore, in this embodiment, while the fuel pressure in the fuel tank 20 can meet the needs of the needle coke furnace 40, and under the premise of abandoning the high-power compressor, the coke oven gas is mixed into the fuel tank 20 to form a mixed fuel with the coal bed gas to achieve the effect of consuming a certain amount of coke oven gas; specifically, the piston type gas delivery pump 32 is used to deliver the coke oven gas to the fuel tank 20, the piston type gas delivery pump 32 does not need to pressurize the coke oven gas or pressurize the coke oven gas at a small power, and can achieve the purpose of delivering the coke oven gas from the coke oven gas tank 30 to the fuel tank 20; in this way, compared with the existing high-power coal gas pressurizing equipment (coal gas compressor), the piston type gas delivery pump 32 can greatly reduce the production cost and has high safety, and will not have the risk of explosion due to the large pressure of the coal gas like the coal gas compressor.

[0037] In one embodiment of the present application, preferably, a gas cut-off valve 33 is arranged on the gas pipeline 31 on both sides of the piston gas pump 32, and the gas cut-off valve 33 can be connected or cut off the passage between the coke oven gas tank 30 and the fuel tank 20 at any time as needed.

[0038] In one embodiment of the present application, preferably, a pressure relief pipeline 34 is further arranged between the coke oven gas tank 30 and the fuel tank 20, and a pressure relief valve 35 is arranged on the pressure relief pipeline 34; when the gas pressure in the fuel tank 20 is higher than the PID valve position controller 24 according to the reference value (i.e. the set value) to open, the pressure relief valve 35 can relieve the high-pressure gas in the fuel tank 20 to the low-pressure coke oven gas tank 30, so as to ensure the stability of the gas pressure in the fuel tank 20.

[0039] In one embodiment of the present application, preferably, the coke oven gas tank 30 is connected to the coke oven gas collecting device 38 through a coke oven pipeline 36, and a gas collecting cut-off valve 37 is arranged on the coke oven pipeline 36; in this way, when the pressure relief valve 35 is opened, the coke oven gas tank 30 will be pressurized to a certain extent, and at this time, the gas collecting cut-off valve 37 is cut off, so as to prevent the high-pressure gas from impacting the coke oven gas collecting device 38.

[0040] In one embodiment of the present application, preferably, a first coal bed gas cut-off valve 12 is arranged on the coal bed gas inlet pipeline 11 close to the coal bed gas tank 10, so as to cut off the supply of coal bed gas from the coal bed gas main pipeline as needed.

[0041] In one embodiment of the present application, preferably, a second pressure transmitter 13 and a third pressure transmitter 14 are arranged on both sides of the first coal bed gas cut-off valve 12, and the second pressure transmitter 13 and the third pressure transmitter 14 are both electrically connected with the PLC valve position controller 15. The PLC valve position controller 15 can control the first coal bed gas cut-off valve 12 to be cut off in time according to the value of the second pressure transmitter 13, so as to avoid the danger caused by the excessive pressure of the coal bed gas tank 10; and at the same time, the PLC valve position controller 15 can control the first coal bed gas cut-off valve 12 to be cut off in time according to the values of the second pressure transmitter 13 and the third pressure transmitter 14 when the value of the third pressure transmitter 14 is less than that of the second pressure transmitter 13, so as to avoid the coal bed gas backflow caused by the decrease of the pressure in the coal bed gas main pipeline.

[0042] In one embodiment of the present application, preferably, a second coal bed gas cut-off valve 25 is arranged between the electric regulating valve 22 on the pressure reduction and pressure stabilization pipeline 21 and the fuel tank 20, so as to cut off the supply of coal bed gas from the coal bed gas tank 10 to the fuel tank 20 as needed.

[0043] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A low consumption and energy saving needle coke production apparatus, characterized by, The application relates to a coal bed gas tank (10), a fuel tank (20) and a needle coke furnace (40), the coal bed gas tank (10) is connected with a coal bed gas main pipeline through a coal bed gas inlet pipeline (11), the fuel tank (20) is connected with the coal bed gas tank (10) through a pressure reduction and pressure stabilization pipeline (21), and the fuel tank (20) provides fuel for the needle coke furnace (40) through a fuel pipeline (41); an electric regulating valve (22) is arranged on the pressure reduction and pressure stabilization pipeline (21), a first pressure transmitter (23) is arranged on the fuel tank (20), and the electric regulating valve (22) and the first pressure transmitter (23) are both connected with a PID valve position controller (24) in an electric circuit; the electric regulating valve (22) on the pressure reduction and pressure stabilization pipeline (21) cooperates with the PID valve position controller (24), so that the gas pressure in the fuel tank (20) is smaller than the gas pressure in the coal bed gas tank (10), and the gas pressure in the fuel tank (20) tends to be dynamically stable.

2. The low consumption and energy-saving production device of needle coke according to claim 1, characterized in that, The maximum gas flow rate of the pressure reduction and pressure stabilization pipeline (21) is greater than the maximum gas flow rate of the fuel pipeline (41).

3. The low consumption and energy-saving production device of needle coke according to claim 1, characterized in that, The application further relates to a coke oven gas tank (30), the coke oven gas tank (30) is connected with the fuel tank (20) through a gas pipeline (31), and a piston type gas conveying pump (32) is arranged on the gas pipeline (31) to convey coke oven gas to the fuel tank (20).

4. The low consumption and energy-saving production device of needle coke according to claim 3, characterized in that, Gas cut-off valves (33) are arranged on the gas pipeline (31) on the two sides of the piston type gas conveying pump (32).

5. The low consumption and energy-saving production device of needle coke according to claim 3, characterized in that, A pressure relief pipeline (34) is further arranged between the coke oven gas tank (30) and the fuel tank (20), and a pressure relief valve (35) is arranged on the pressure relief pipeline (34).

6. The low consumption and energy-saving production device of needle coke according to claim 5, characterized in that, The coke oven gas tank (30) is connected to a coke oven gas collecting device through a coke oven pipeline (36), and a gas collection cut-off valve (37) is arranged on the coke oven pipeline (36).

7. The low consumption and energy-saving production device of needle coke according to claim 1, characterized by, A first coal bed gas cut-off valve (12) is arranged on the coal bed gas inlet pipeline (11) close to the coal bed gas tank (10).

8. The low consumption and energy-saving production device of needle coke according to claim 7, characterized in that, Second and third pressure transmitters (13) and (14) are arranged on the two sides of the first coal bed gas cut-off valve (12), and the second and third pressure transmitters (13) and (14) and the first coal bed gas cut-off valve (12) are all connected with a PLC valve position controller (15) in an electric circuit.

9. The low consumption and energy-saving production device of needle coke according to claim 1, characterized by, A second coal bed gas cut-off valve (25) is arranged between the electric regulating valve (22) on the pressure reduction and pressure stabilization pipeline (21) and the fuel tank (20).

10. The low consumption and energy-saving production device of needle coke according to claim 1, characterized by, A fuel regulating valve (42) is arranged on the fuel pipeline (41).

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