A water-coal slurry gasification device and a water-coal slurry gasification method

Abstract

The present invention discloses a water-coal slurry gasification device and a water-coal slurry gasification method. The water-coal slurry gasification device comprises a nozzle, the nozzle comprises a nozzle front end pipe and a nozzle, the nozzle is provided with an inner oxygen outlet, a water-coal slurry outlet and an outer oxygen outlet, the nozzle front end pipe is provided with an inner oxygen pipeline, a water-coal slurry pipeline and an outer oxygen pipeline, the water-coal slurry pipeline is connected to an external water-coal slurry delivery pipeline, and the water-coal slurry delivery pipeline and the nozzle front end pipe are provided with an electromagnetic coil outside. The water-coal slurry gasification method comprises the following steps: inputting the water-coal slurry into the water-coal slurry delivery pipeline, and then spraying it out through the water-coal slurry outlet, and gasifying it under the action of the oxygen sprayed from the inner oxygen outlet and the outer oxygen outlet. The water-coal slurry gasification device and the water-coal slurry gasification method of the present invention improve the flow characteristics of the water-coal slurry, reduce its flow resistance and energy consumption; and reduce the material wear of the water-coal slurry gasification device, thereby increasing the service life of the device.

Description

Technical Field

[0001] The invention relates to a water-coal slurry gasification device and a water-coal slurry gasification method. Background Art

[0002] Magnetic fields have been widely used in chemical industry and other fields, such as water treatment, crude oil treatment, magnetic separation of coal, etc. As the raw material for coal gasification, the slurry performance and stability of water-coal slurry are closely related to the properties of coal powder, water and additives. Coal powder generally has diamagnetic properties; hydrogen atoms in water molecules have diamagnetic properties, and oxygen atoms have paramagnetic properties. When diamagnetic elements are affected by an external magnetic field, the induced additional magnetic field is opposite to the direction of the external magnetic field; when paramagnetic elements are affected by an external magnetic field, the induced additional magnetic field is in the same direction as the external magnetic field.

[0003] When the water-coal slurry is affected by an external magnetic field, the oxygen atoms and hydrogen atoms in the water molecules generate magnetic fields in opposite directions. Therefore, the bond distance between oxygen and hydrogen becomes longer, the surface tension of the aqueous solution decreases, the wettability of water increases, the adhesion between coal and water in the water-coal slurry increases, and the coal particles are arranged in a directional manner in the water-coal slurry to form ordered flocs, which improves fluidity, increases stability, and reduces pipeline friction resistance.

[0004] The water-coal slurry flows in the pipeline of the gasification system and is atomized by high-speed gas at the outlet of the water-coal slurry gasification nozzle. Its flow resistance will lead to increased energy consumption, and the friction and resistance generated at the nozzle outlet will cause metal wear at the front end of the nozzle, reducing the service life of the nozzle. Therefore, a water-coal slurry gasification nozzle and a simple and effective method for reducing the flow resistance of the water-coal slurry in the nozzle are urgently needed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a water-coal slurry gasification device and a water-coal slurry gasification method in order to overcome the defects of the nozzle being easy to wear and having a short service life in the existing water-coal slurry gasification device and the high flow resistance of the water-coal slurry in the existing water-coal slurry gasification method. The water-coal slurry gasification device and the water-coal slurry gasification method of the present invention simply and effectively reduce the flow resistance of the water-coal slurry in the nozzle, reduce the energy consumption of the water-coal slurry transportation and the friction resistance between the water-coal slurry and the nozzle outlet pipe, and extend the service life of the nozzle.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a water-coal slurry gasification device, which comprises a nozzle, wherein the nozzle comprises a nozzle front end pipeline and a nozzle connected with the nozzle front end pipeline, wherein the nozzle is coaxially provided with an inner oxygen outlet, a water-coal slurry outlet and an outer oxygen outlet from the inside to the outside, and the nozzle front end pipeline is coaxially provided with an inner oxygen pipeline, a water-coal slurry pipeline and an outer oxygen pipeline from the inside to the outside, respectively, the water-coal slurry pipeline is connected to an external water-coal slurry delivery pipeline, and the outside of the water-coal slurry delivery pipeline and the nozzle front end pipeline are respectively provided with a first electromagnetic coil and a second electromagnetic coil, wherein the first electromagnetic coil is used to magnetize the water-coal slurry in the water-coal slurry delivery pipeline, and the second electromagnetic coil is used to magnetize the water-coal slurry in the nozzle front end pipeline.

[0008] In the present invention, the materials of the first electromagnetic coil and the second electromagnetic coil can be conventional in the art, preferably copper wires coated with insulating wire tubes.

[0009] The insulating wire tube may be conventional in the art, preferably an insulating wire tube made of polytetrafluoroethylene material.

[0010] In the present invention, preferably, a cooling device is provided outside the pipe at the front end of the nozzle.

[0011] In the present invention, the cooling device may be a conventional cooling device in the art for cooling, such as a shell water-cooled wall, a water-cooled jacket or a water-cooled coil.

[0012] Preferably, the cooling device is a water-cooled coil disposed outside the second electromagnetic coil. In the present invention, the pipes can be connected in a conventional manner in the art, such as by flange connection. Those skilled in the art are aware of selecting a suitable flange according to the specifications of the pipes used.

[0013] In the present invention, the water-coal slurry gasification device generally further includes a gasifier according to the convention in the art, and the nozzle is arranged on the top of the gasifier.

[0014] Preferably, the nozzle front end pipeline is connected to the gasifier through a gasifier interface flange.

[0015] The gasifier may be conventional in the art. Generally speaking, the gasifier operates under high temperature and high pressure conditions, and the general operating temperature is about 1200-1500°C.

[0016] The cooling device protects the second electromagnetic coil from being damaged by the high temperature and high pressure environment of the gasifier, and can take away the heat generated by the second electromagnetic coil when it is working.

[0017] In the present invention, the specifications of the inner oxygen pipeline, the water-coal slurry pipeline, the outer oxygen pipeline, the inner oxygen outlet, the water-coal slurry outlet and the outer oxygen outlet may be conventional in the art.

[0018] In one embodiment of the present invention, the inner oxygen pipeline is connected to an inner oxygen delivery pipeline through a flange with a specification of DN80; the water-coal slurry delivery pipeline and the water-coal slurry pipeline are connected through a flange with a specification of DN150; the inner oxygen pipeline is connected to an outer oxygen delivery pipeline through a flange with a specification of DN150; the inner diameter of the inner oxygen pipeline is 50mm and the wall thickness is 5mm; the inner diameter of the inner oxygen outlet is 17mm and the wall thickness is 2mm; the inner diameter of the water-coal slurry delivery pipeline and the water-coal slurry pipeline is 70mm and the wall thickness is 5mm; the inner diameter of the water-coal slurry outlet is 52mm and the wall thickness is 2.5mm; the annular gap between the water-coal slurry outlet and the inner oxygen outlet is about 15mm; the inner diameter of the outer oxygen pipeline and the outer oxygen delivery pipeline is 220mm and the wall thickness is 12mm; the inner diameter of the outer oxygen outlet is 60mm; the annular gap between the outer oxygen outlet and the water-coal slurry outlet is about 4mm.

[0019] The present invention also provides a water-coal slurry gasification method, which is carried out using the above-mentioned water-coal slurry gasification device, and includes the following steps: inputting the water-coal slurry into the water-coal slurry conveying pipeline, then spraying it out through the water-coal slurry outlet, and gasifying it under the action of oxygen sprayed from the inner oxygen outlet and the outer oxygen outlet.

[0020] In the present invention, those skilled in the art are aware of setting the positive and negative pole positions of the first electromagnetic coil and the second electromagnetic coil according to the flow direction of the water-coal slurry.

[0021] In the present invention, those skilled in the art are aware of adjusting the number of turns, length and magnetic field of the first electromagnetic coil and the second electromagnetic coil according to the magnetic field strength to be generated; the magnetic field strength refers to the magnetic field strength at the axis of each pipeline.

[0022] Preferably, the magnetic field strength generated by the first electromagnetic coil is greater than 50 mT; more preferably, 80 mT.

[0023] The electromagnetic field generated by the first electromagnetic coil is in the same direction as the flow direction of the water-coal slurry in the water-coal slurry delivery pipeline. The water-coal slurry is affected by the magnetic field, and its fluidity is improved, its stability is increased, and its pipeline friction resistance is reduced. The flow characteristics of the water-coal slurry treated by the electromagnetic field will not change in a short time due to the disappearance of the electromagnetic field, providing support for further resistance reduction after the water-coal slurry flows into the pipeline in front of the nozzle.

[0024] Preferably, the magnetic field strength generated by the second electromagnetic coil is greater than 200 mT; more preferably, 300 mT.

[0025] Among them, the second electromagnetic coil further reduces the flow resistance of the water-coal slurry, reduces the friction of the water-coal slurry when the water-coal slurry is atomized by oxygen in the nozzle, reduces the wear of the material of the nozzle, and increases the service life of the water-coal slurry gasification device.

[0026] In the present invention, those skilled in the art are aware that the current passing through the first electromagnetic coil and the second electromagnetic coil is generally supplied by direct current.

[0027] In the present invention, the flow ratio of inner oxygen to outer oxygen in the inner oxygen pipeline and the outer oxygen pipeline can be conventional in the art; preferably, it is 1:9 to 3:7; more preferably, it is 2:8.

[0028] In the present invention, the oxygen-to-carbon ratio of the gasification may be conventional in the art, and generally needs to meet the gasification operating conditions, that is, the oxygen-to-carbon ratio of the gasification is 1:(0.9-1.1).

[0029] The oxygen-carbon ratio refers to the ratio of the total content of oxygen in the inner oxygen pipeline and the outer oxygen pipeline to the carbon content of the water-coal slurry in the water-coal slurry pipeline.

[0030] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0031] The reagents and raw materials used in the present invention are commercially available.

[0032] The positive and progressive effects of the present invention are:

[0033] 1. The water-coal slurry gasification device and the water-coal slurry gasification method of the present invention improve the flow characteristics of the water-coal slurry, reduce the flow resistance of the water-coal slurry, and reduce energy consumption.

[0034] 2. The water-coal slurry gasification device and the water-coal slurry gasification method of the present invention reduce the material wear on the water-coal slurry outlet when the water-coal slurry is atomized at the nozzle, thereby increasing the service life of the water-coal slurry gasification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the water-coal slurry gasification device of the present invention.

[0036] Figure 2 It is a cross-sectional view of the pipeline at the front end of the nozzle of the water-coal slurry gasification device of the present invention.

[0037] Figure 3 for Figure 2 A partial enlarged view of the nozzle of the water-coal slurry gasification device of the present invention.

[0038] Description of reference numerals:

[0039] 1. Nozzle; 11. Nozzle front pipe; 12. Sprinkler;

[0040] 21. Coal-water slurry transportation pipeline; 22. Coal-water slurry pipeline; 23. Coal-water slurry outlet;

[0041] 32. Internal oxygen pipeline; 33. Internal oxygen outlet;

[0042] 42. External oxygen pipeline; 43. External oxygen outlet;

[0043] 51. a first electromagnetic coil; 52. a second electromagnetic coil;

[0044] 6. Water cooling coil. DETAILED DESCRIPTION

[0045] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0046] Example 1

[0047] A water-coal slurry gasification device, such as Figures 1 to 3 As shown, it includes a nozzle 1, which includes a nozzle front end pipe 11 and a nozzle head 12 connected to the nozzle front end pipe 11, the nozzle head 12 is coaxially provided with an inner oxygen outlet 33, a water-coal slurry outlet 23 and an outer oxygen outlet 43 from the inside to the outside, the nozzle front end pipe 11 is coaxially provided with an inner oxygen pipeline 32, a water-coal slurry pipeline 22 and an outer oxygen pipeline 42 from the inside to the outside, the water-coal slurry pipeline 22 is connected to an external water-coal slurry delivery pipeline 21, and the outside of the water-coal slurry delivery pipeline 21 and the nozzle front end pipe 11 are respectively provided with a first electromagnetic coil 51 and a second electromagnetic coil 52, the first electromagnetic coil 51 is used to magnetize the water-coal slurry in the water-coal slurry delivery pipeline 21, and the second electromagnetic coil 52 is used to magnetize the water-coal slurry in the nozzle front end pipe 11.

[0048] In this embodiment, the first electromagnetic coil 51 is located at the left end of the water-coal slurry conveying pipeline 21 as the positive pole position; the right end of the water-coal slurry conveying pipeline 21 is the negative pole position; the second electromagnetic coil 52 is located at the right end of the nozzle front end pipeline 11 as the positive pole position; the left end of the nozzle front end pipeline 11 is the negative pole position.

[0049] The first electromagnetic coil 51 and the second electromagnetic coil 52 are made of copper wire covered with an insulating wire tube, and the insulating wire tube is made of polytetrafluoroethylene material.

[0050] A cooling device is provided outside the nozzle front end pipe 11. In this embodiment, the cooling device is a water cooling coil 6 wrapped outside the second electromagnetic coil 52.

[0051] In this embodiment, each pipeline is connected by a flange. In this embodiment, the inner oxygen delivery pipeline and the inner oxygen pipeline 32 are connected by a flange with a specification of DN80; the water-coal slurry delivery pipeline 21 and the water-coal slurry pipeline 22 are connected by a flange with a specification of DN150; the outer oxygen delivery pipeline and the inner oxygen pipeline 32 are connected by a flange with a specification of DN150.

[0052] In this embodiment, the inner diameter of the inner oxygen pipeline 32 is 50 mm and the wall thickness is 5 mm; the inner diameter of the inner oxygen outlet 33 is 17 mm and the wall thickness is 2 mm; the inner diameter of the water-coal slurry delivery pipeline 21 and the water-coal slurry pipeline 22 is 70 mm and the wall thickness is 5 mm; the inner diameter of the water-coal slurry outlet 23 is 52 mm and the wall thickness is 2.5 mm; the annular gap between the water-coal slurry outlet 23 and the inner oxygen outlet 33 is about 15 mm; the inner diameter of the outer oxygen delivery pipeline and the outer oxygen pipeline 42 is 220 mm and the wall thickness is 12 mm; the inner diameter of the outer oxygen outlet 43 is 60 mm; the annular gap between the outer oxygen outlet 43 and the water-coal slurry outlet 23 is about 4 mm.

[0053] The nozzle front end pipe 11 is connected to the gasifier (not shown) through the gasifier interface flange, and the specification of the interface flange is DN450.

[0054] The operating temperature of the gasifier is about 1350°C and the pressure is 4.0mPa.

[0055] The water cooling coil 6 protects the second electromagnetic coil 52 from being damaged by the high temperature and high pressure environment of the gasifier, and can take away the heat generated by the second electromagnetic coil 52 when it is working.

[0056] The water-coal slurry gasification device of this embodiment can be operated according to the following water-coal slurry gasification method when applied to the gasification of water-coal slurry:

[0057] The water-coal slurry is input into the water-coal slurry conveying pipeline 21 , and then ejected from the water-coal slurry outlet 23 , and gasified under the action of oxygen ejected from the inner oxygen outlet 33 and the outer oxygen outlet 43 .

[0058] The magnetic field strength generated by the first electromagnetic coil 51 is 80 mT.

[0059] The electromagnetic field generated by the first electromagnetic coil 51 is in the same direction as the flow direction of the water-coal slurry in the water-coal slurry delivery pipeline 21. The water-coal slurry is affected by the magnetic field, and its fluidity is improved, its stability is increased, and the friction resistance of the pipeline is reduced. The flow characteristics of the water-coal slurry treated by the magnetic field will not change in a short time due to the disappearance of the magnetic field, which provides support for further resistance reduction after the water-coal slurry flows into the pipeline 11 at the front end of the nozzle.

[0060] The magnetic field strength generated by the second electromagnetic coil 52 is 200 mT.

[0061] The second electromagnetic coil 52 further reduces the flow resistance of the water-coal slurry, reduces the friction of the water-coal slurry when it is atomized by oxygen in the nozzle 12, reduces the wear of the material of the nozzle 12, and increases the service life of the water-coal slurry gasification device.

[0062] The first electromagnetic coil 51 and the second electromagnetic coil 52 are powered by direct current, wherein the maximum voltage of the direct current powering the first electromagnetic coil 51 is 60V and the maximum current is 20A; the maximum voltage of the direct current powering the second electromagnetic coil 52 is 60V and the maximum current is 35A.

[0063] The flow ratio of the inner oxygen to the outer oxygen in the inner oxygen pipe 32 and the outer oxygen pipe 42 is 2:8.

[0064] The oxygen-carbon ratio of the coal-water slurry in the coal-water slurry pipeline 22 and the oxygen in the inner oxygen pipeline 32 and the outer oxygen pipeline 42 is 1:1.

[0065] The use of the water-coal slurry gasification device and the water-coal slurry gasification method of the present embodiment can reduce the wear of the metal material of the nozzle 12 and increase the service life of the water-coal slurry gasification device by 15%.

[0066] Example 2

[0067] The difference between the water-coal slurry gasification device and the water-coal slurry gasification method of this embodiment and that of Embodiment 1 is that the magnetic field strength generated by the second electromagnetic coil 52 is 300 mT.

[0068] The use of the water-coal slurry gasification device and the water-coal slurry gasification method of the present embodiment can reduce the wear of the metal material of the nozzle 12 and increase the service life of the water-coal slurry gasification device by 18%.

[0069] Effect Example 1

[0070] The service life of the water-coal slurry gasification device can be estimated by measuring the wear of the water-coal slurry gasification device through intermittent experiments over a long period of time. For example, each test is 24 hours, and the next test is carried out 3-5 days after shutdown. After 24-30 tests, the end wear is measured.

[0071] This embodiment adopts a four-nozzle opposed water-coal slurry gasification test platform. In a pair of water-coal slurry gasification devices of the same geometric size, one adopts the water-coal slurry gasification device and the water-coal slurry gasification method in Example 2 of the present invention, and the other adopts the water-coal slurry gasification device and the water-coal slurry gasification method in the prior art. After 25 consecutive cycles of testing, the diameter wear of the water-coal slurry outlet of the water-coal slurry gasification device is measured. Among them, the structure of the water-coal slurry gasification device in the prior art is disclosed in the literature Visualization study on particle flow behaviors during atomization in an impinging entrained-flow gasifier, DOI: 10.1016 / j.ces.2020.115834 and the literature Detaileddeposition characteristics around burner plane in an impinging entrained-flowcoal gasifier, DOI: 10.1016 / j.ces.2019.01.016.

[0072] The results show that the wear amount of the water-coal slurry outlet in Example 2 is 18% lower than that in the prior art. It can be judged that the water-coal slurry gasification device and water-coal slurry gasification method in Example 2 of the present invention can increase the service life of the water-coal slurry gasification device by 18% compared with the prior art.

[0073] The present invention is not limited to the above-mentioned embodiments. Any changes in shape or structure are within the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are within the protection scope of the present invention.

Claims

1. A water-coal slurry gasification device, characterized in that: It comprises a nozzle, the nozzle comprises a nozzle front end pipe and a nozzle connected with the nozzle front end pipe, the nozzle is coaxially provided with an inner oxygen outlet, a water-coal slurry outlet and an outer oxygen outlet from the inside to the outside, the nozzle front end pipe is coaxially provided with an inner oxygen pipeline, a water-coal slurry pipeline and an outer oxygen pipeline from the inside to the outside, the water-coal slurry pipeline is connected with an external water-coal slurry delivery pipeline, the water-coal slurry delivery pipeline and the nozzle front end pipe are respectively provided with a first electromagnetic coil and a second electromagnetic coil outside, the first electromagnetic coil is used to magnetize the water-coal slurry in the water-coal slurry delivery pipeline, and the second electromagnetic coil is used to magnetize the water-coal slurry in the nozzle front end pipe; the first electromagnetic coil is located at the left end of the water-coal slurry delivery pipeline as a positive pole position; the right end of the water-coal slurry delivery pipeline is located at the negative pole position; the second electromagnetic coil is located at the right end of the nozzle front end pipe as a positive pole position; the left end of the nozzle front end pipe is located at the negative pole position; the first electromagnetic coil is used to generate a magnetic field with a magnetic field strength greater than 50mT, and the second electromagnetic coil is used to generate a magnetic field with a magnetic field strength greater than 200mT; A cooling device is arranged outside the front end pipeline of the nozzle; the water-coal slurry gasification device also includes a gasification furnace, and the nozzle is arranged on the top of the gasification furnace.

2. The water-coal slurry gasification device according to claim 1, characterized in that: The first electromagnetic coil and the second electromagnetic coil are powered by direct current; And / or, the first electromagnetic coil and the second electromagnetic coil are made of copper wire covered with an insulating wire tube.

3. The water-coal slurry gasification device according to claim 1, characterized in that: The cooling device is a shell water-cooled wall, a water-cooled jacket or a water-cooled coil; And / or, the nozzle front end pipeline is connected to the gasifier through a gasifier interface flange.

4. The water-coal slurry gasification device according to claim 1, characterized in that: The cooling device is a water cooling coil wrapped outside the second electromagnetic coil.

5. The water-coal slurry gasification device according to claim 1, characterized in that: The inner diameter of the inner oxygen pipeline is 50mm and the wall thickness is 5mm; the inner diameter of the inner oxygen outlet is 17mm and the wall thickness is 2mm; the inner diameter of the water-coal slurry delivery pipeline and the water-coal slurry pipeline is 70mm and the wall thickness is 5mm; the inner diameter of the water-coal slurry outlet is 52mm and the wall thickness is 2.5mm; the annular gap between the water-coal slurry outlet and the inner oxygen outlet is 15mm; the inner diameter of the outer oxygen pipeline is 220mm and the wall thickness is 12mm; the inner diameter of the outer oxygen outlet is 60mm; the annular gap between the outer oxygen outlet and the water-coal slurry outlet is 4mm.

6. A method for gasifying water-coal slurry, characterized in that: The method is carried out using the water-coal slurry gasification device as described in any one of claims 1 to 5, comprising the following steps: inputting the water-coal slurry into the water-coal slurry conveying pipeline, then spraying it out through the water-coal slurry outlet, and gasifying it under the action of oxygen sprayed from the inner oxygen outlet and the outer oxygen outlet.

7. The method for gasifying coal-water slurry according to claim 6, characterized in that: The magnetic field strength generated by the first electromagnetic coil is 80mT; And / or, the magnetic field strength generated by the second electromagnetic coil is 300 mT.

8. The method for gasifying coal-water slurry according to claim 6, characterized in that: When the water-coal slurry gasification device includes a gasifier, the operating temperature of the gasifier is 1200-1500°C.

9. The method for gasifying coal-water slurry according to claim 6, characterized in that: The flow ratio of inner oxygen to outer oxygen in the inner oxygen pipeline and the outer oxygen pipeline is 1:9 to 3:

7.

10. The method for gasifying coal-water slurry according to claim 6, characterized in that: The flow ratio of inner oxygen to outer oxygen in the inner oxygen pipeline and the outer oxygen pipeline is 2:

8.

11. The method for gasifying coal-water slurry according to claim 6, characterized in that: The oxygen-carbon ratio of the gasification is 1:(0.9-1.1), wherein the oxygen-carbon ratio is the ratio of the total content of oxygen in the inner oxygen pipeline and the outer oxygen pipeline to the carbon content of the water-coal slurry in the water-coal slurry pipeline.

Images