Coal water slurry acceleration device
By introducing nitrogen branch pipes into the coal-water slurry system to increase the flow rate of coal slurry on the outside, the problems of high-temperature erosion of the burner and channel blockage were solved, and the flame extension and atomization effect were improved.
Patent Information
- Application Number
- CN202422818443.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The existing four-channel coal-water slurry burner has a low flow velocity in the outer coal slurry channel, which causes the flame to be too close to the burner end. The radiant heat causes high-temperature erosion of the burner, and the coal slurry is prone to adhesion, coking, and blockage.
By adding a nitrogen branch pipe, high-pressure nitrogen is used to increase the flow rate of the coal slurry on the outside. The nitrogen branch pipe is connected to the start-up fuel gas pipeline, and a flow meter and a remote pressure gauge are installed for control, which prolongs the coal slurry combustion flame and improves the atomization effect.
It increases the outer coal slurry flow rate to 3.5 m/s, extends the flame black zone length, protects the burner, prevents channel blockage, improves coal slurry atomization, is low in cost, and is applicable to all four-channel burner coal-water slurry gasification systems.
Smart Images
Figure CN223535043U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of coal gasification technology for coal-water slurry, and more specifically, relates to a coal-water slurry acceleration device. Background Technology
[0002] like Figure 1 As shown, the existing four-channel coal-water slurry burner consists of a central oxygen channel, an inner coal slurry channel, an outer annular oxygen channel, and an outer coal slurry channel from the inside out. Two shut-off valves are installed on the start-up gas pipeline. During the start-up heating phase, the start-up fuel gas enters the gasifier through the outer coal slurry channel. After the outer coal slurry is added, the start-up fuel gas shut-off valve is interlocked and closed, while the start-up gas nitrogen distribution valve connected between the two shut-off valves opens. High-pressure nitrogen is used for nitrogen plugging to ensure the downstream shut-off valve functions effectively. Currently, the flow velocity in the outer coal slurry channel of the four-channel coal-water slurry burner is less than 1.5 m / s. Therefore, the flame black zone formed in the outer coal slurry channel is relatively short, and the flame generated by the combustion of coal slurry and oxygen is too close to the burner tip. The radiant heat causes the temperature at the end of the outer coal slurry channel to be too high, leading to burner damage due to high-temperature erosion.
[0003] Meanwhile, due to the high viscosity of the coal slurry, the low-flow-rate coal slurry tends to adhere to the outer coal slurry channel, where it cokes and melts under high-temperature conditions, causing blockage of the outer coal slurry channel. Utility Model Content
[0004] To address the shortcomings of the existing technology, the purpose of this application is to provide a coal-water slurry acceleration device that increases the flow rate of the outer coal slurry, prolongs the combustion flame of the coal slurry, expands the black zone of the flame, thereby protecting the burner, preventing blockage of the outer coal slurry channel, and improving the coal slurry atomization effect.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a coal-water slurry acceleration device is provided, comprising: an initial fuel gas pipeline, an outer coal slurry supply pipeline, a high-pressure nitrogen pipeline, and a burner. An upstream shut-off valve and a downstream shut-off valve are sequentially installed on the initial fuel gas pipeline. The high-pressure nitrogen pipeline is connected between the upstream and downstream shut-off valves. The initial fuel gas pipeline and the outer coal slurry supply pipeline converge and are connected to the outer coal slurry channel of the burner via a main supply pipe. The device also includes a nitrogen branch pipe, one end of which is connected to the high-pressure nitrogen pipeline, and the other end of which is connected to the initial fuel gas pipeline located downstream of the downstream shut-off valve. An acceleration nitrogen switch valve is installed on the nitrogen branch pipe. A first flow meter is installed on the high-pressure nitrogen pipeline, and a second flow meter is installed on the outer coal slurry supply pipeline.
[0006] In one embodiment, the nitrogen branch pipe is provided with a shut-off valve and a branch pipe check valve downstream of the speed-up nitrogen switch valve.
[0007] In one embodiment, a first remote pressure gauge is provided on the high-pressure nitrogen pipeline, a second remote pressure gauge is provided on the main feed pipe, and a third remote pressure gauge is provided on the gasifier where the burner is located. The first, second, and third remote pressure gauges are all electrically interlocked with the speed-up nitrogen switch valve.
[0008] In one embodiment, a low flow rate alarm for the outer coal slurry channel is also included.
[0009] In one embodiment, the high-pressure nitrogen pipeline is equipped with a start-up gas nitrogen distribution valve and a high-pressure nitrogen check valve, and the nitrogen branch pipe is connected between the start-up gas nitrogen distribution valve and the high-pressure nitrogen check valve.
[0010] In one embodiment, three start-up fuel gas check valves are provided downstream of the downstream shut-off valve, and the nitrogen branch pipe is connected between the first start-up fuel gas check valve and the second start-up fuel gas check valve.
[0011] The beneficial effects of the coal-water slurry acceleration device provided in this application are as follows: by setting up a nitrogen branch pipe, the existing high-pressure nitrogen is utilized to increase the flow rate of the outer coal slurry, thereby prolonging the combustion flame of the coal slurry and expanding the black zone of the flame, thus protecting the burner and preventing blockage of the outer coal slurry channel; using nitrogen as the carrier for acceleration, the gas-liquid two-phase system helps to improve the atomization effect of the coal-water slurry; the operating cost is low, it can utilize the existing high-pressure nitrogen system, and it is applicable to all four-channel burner coal-water slurry gasification systems, with a wide range of applications. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a schematic diagram showing the connection relationship between the burner and the coal-water slurry, the start-up fuel gas, and the high-pressure nitrogen in the existing technology.
[0014] Figure 2 This is a simplified structural diagram of a coal-water slurry acceleration device provided in an embodiment of this application.
[0015] The following are the labeling elements in the figure:
[0016] 1. Start-up fuel gas pipeline; 11. Upstream shut-off valve; 12. Downstream shut-off valve; 13. Start-up fuel gas check valve; 2. Outer coal slurry supply pipeline; 21. Second flow meter; 3. High-pressure nitrogen pipeline; 31. First flow meter; 32. First remote pressure gauge; 33. Start-up gas nitrogen distribution valve; 34. High-pressure nitrogen check valve; 4. Burner; 5. Main feed pipe; 51. Second remote pressure gauge; 6. Nitrogen branch pipe; 61. Accelerated nitrogen switch valve; 62. Shut-off valve; 63. Branch pipe check valve; 7. Third remote pressure gauge. Detailed Implementation
[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0021] like Figure 2As shown, a coal-water slurry acceleration device provided in this application embodiment will now be described. This coal-water slurry acceleration device includes: a start-up fuel gas pipeline 1, an outer coal slurry supply pipeline 2, a high-pressure nitrogen pipeline 3, and a burner 4. An upstream shut-off valve 11 and a downstream shut-off valve 12 are sequentially installed on the start-up fuel gas pipeline 1. The high-pressure nitrogen pipeline 3 is connected between the upstream shut-off valve 11 and the downstream shut-off valve 12. The start-up fuel gas pipeline 1 and the outer coal slurry supply pipeline 2 converge and are connected to the outer coal slurry channel of the burner 4 through a main supply pipe 5. To increase the flow rate of the outer coal slurry entering the outer coal slurry channel, the improvement in this embodiment is as follows: A nitrogen branch pipe 6 is added. One end of the nitrogen branch pipe 6 is connected to the high-pressure nitrogen pipeline 3, and the other end is connected to the start-up fuel gas pipeline located downstream of the downstream shut-off valve 12. A nitrogen boosting switch valve 61 is installed on the nitrogen branch pipe 6. A first flow meter 31 is installed on the high-pressure nitrogen pipeline 3, and a second flow meter 21 is installed on the outer coal slurry supply pipeline 2. The first flow meter 31 and the second flow meter 21 are electrically connected to a distributed control system (DCS). The DCS has a configuration formula: Outer coal slurry channel medium flow rate = (Outer coal slurry flow rate + Coal slurry boosting nitrogen flow rate) / Outer coal slurry pipeline cross-sectional area. The first flow meter 31 is used to calculate the coal slurry boosting nitrogen flow rate, and the second flow meter 21 is used to measure the outer coal slurry flow rate in the outer coal slurry supply pipeline 2. The outer coal slurry channel medium flow rate calculated by the DCS can be displayed on a monitor for intuitive confirmation by the staff. In this embodiment, the flow rate of the medium in the external coal slurry channel is required to be above 3.5 m / s. This extends the coal slurry combustion flame and increases the black zone length to 163 mm, thus protecting the burner 4. The speed-up nitrogen switching valve 61 is a pneumatic switching valve, facilitating automated opening and closing.
[0022] In this embodiment, a shut-off valve 62 and a branch check valve 63 are provided downstream of the nitrogen booster switch valve 61 on the nitrogen branch pipe 6. The shut-off valve 62 can be used to regulate the nitrogen flow rate, and the branch check valve 63 can prevent nitrogen backflow. The nitrogen branch pipe 6 is a DN25 pipe.
[0023] In this embodiment, a first remote pressure gauge 32 is installed on the high-pressure nitrogen pipeline 3, a second remote pressure gauge 51 is installed on the main feed pipe 5, and a third remote pressure gauge 7 is installed on the gasifier where the burner 4 is located. The first, second, and third remote pressure gauges 32, 51, and 7 are all electrically interlocked with the speed-up nitrogen switch valve 61. Specifically, the speed-up nitrogen switch valve 61 closes when the reading of the first remote pressure gauge 32 is below 6.7 MPag; it closes when the pressure difference between the readings of the second and first remote pressure gauges 51 and 32 is less than 0.3 MPag; it closes when the pressure difference between the readings of the third and first remote pressure gauges 7 and 32 is less than 0.3 MPag; and it closes when the gasifier shutdown sequential control is triggered.
[0024] In this embodiment, the coal-water slurry acceleration device also includes an external coal slurry channel low flow rate alarm that is electrically connected to the distributed control system. When the flow rate of the medium in the external coal slurry channel is lower than the preset flow rate, an alarm is triggered. The preset flow rate is 2 m / s.
[0025] In this embodiment, the high-pressure nitrogen pipeline 3 is equipped with a start-up gas nitrogen distribution valve 33 and a high-pressure nitrogen check valve 34, and the nitrogen branch pipe 6 is connected between the start-up gas nitrogen distribution valve 33 and the high-pressure nitrogen check valve 34. The opening and closing of the start-up gas nitrogen distribution valve 33 is used to realize the supply of nitrogen, and the high-pressure nitrogen check valve 34 is used to prevent nitrogen from flowing back when it obstructs the downstream shut-off valve 12.
[0026] In this embodiment, in order to prevent fuel gas backflow, three start-up fuel gas check valves 13 are provided downstream of the downstream shut-off valve 12. The nitrogen branch pipe 6 is connected between the first start-up fuel gas check valve 13 and the second start-up fuel gas check valve 13. The start-up fuel gas check valves 13 are used to prevent fuel gas and coal-water slurry backflow.
[0027] In this embodiment, the pressure of the high-pressure nitrogen gas is 8.2 MPag, and the temperature is 20°C. The amount of high-pressure nitrogen gas used is 20 m³. 3 / h (converted to standard state volumetric flow rate is 1530 Nm³) 3 The design flow rate of the mixing medium in the outer coal slurry channel is 4.1 m / s, and the design flow rate of the outer coal slurry is 12 m³ / h. 3 / h.
[0028] Operating Procedure: After activating the outer coal slurry channel according to the original gasifier start-up plan, the operator on the screen manually opens the booster nitrogen switch valve 61, and the on-site operator opens the shut-off valve 62 to activate the booster nitrogen. Observe the flow rate of the medium in the outer coal slurry channel. Manually adjust the flow rate to above 3.5 m / s through the shut-off valve 62. Observe whether the readings of the first flow meter 31 and the second flow meter 21 are within the normal range. The pressure of the outer coal slurry inlet burner 4 should rise slightly under normal conditions.
[0029] In this embodiment, the coal-water slurry acceleration device effectively increases the flow rate of the outer coal slurry, prolongs the combustion flame, and doubles the size of the black zone, thereby protecting the burner 4, preventing slurry channel blockage, and improving the atomization effect of the coal slurry. This coal-water slurry acceleration device has low technical application costs, can utilize existing high-pressure nitrogen systems, and requires no additional construction or introduction of other hazardous media. Practical application results demonstrate that this coal-water slurry acceleration device effectively solves two major industry problems: high-temperature erosion of the burner 4 and coking blockage of the outer coal slurry channel.
[0030] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A coal-water slurry acceleration device, comprising: The system includes a start-up fuel gas pipeline (1), an outer coal slurry supply pipeline (2), a high-pressure nitrogen pipeline (3), and a burner (4). The start-up fuel gas pipeline (1) is equipped with an upstream shut-off valve (11) and a downstream shut-off valve (12) in sequence. The high-pressure nitrogen pipeline (3) is connected between the upstream shut-off valve (11) and the downstream shut-off valve (12). The start-up fuel gas pipeline (1) and the outer coal slurry supply pipeline (2) converge and are connected to the outer coal slurry channel of the burner (4) via a main supply pipe (5). The invention is characterized by including a nitrogen branch pipe (6), one end of which is connected to the high-pressure nitrogen pipeline (3), and the other end of which is connected to the start-up fuel gas pipeline (1) located downstream of the downstream shut-off valve (12). The nitrogen branch pipe (6) is equipped with a speed-up nitrogen switch valve (61); the high-pressure nitrogen pipeline (3) is equipped with a first flow meter (31), and the outer coal slurry supply pipeline (2) is equipped with a second flow meter (21).
2. The water-coal slurry acceleration device as described in claim 1, characterized in that: The nitrogen branch pipe (6) is provided with a shut-off valve (62) and a branch pipe check valve (63) downstream of the speed-up nitrogen switch valve (61).
3. The water-coal slurry acceleration device as described in claim 2, characterized in that: The high-pressure nitrogen pipeline (3) is equipped with a first remote pressure gauge (32), the main feed pipe (5) is equipped with a second remote pressure gauge (51), and the gasifier where the burner (4) is located is equipped with a third remote pressure gauge (7). The first remote pressure gauge (32), the second remote pressure gauge (51) and the third remote pressure gauge (7) are all electrically interlocked with the speed-up nitrogen switch valve (61).
4. The water-coal slurry acceleration device as described in claim 1, characterized in that: It also includes a low flow rate alarm for the outer coal slurry channel.
5. A coal-water slurry acceleration device as described in any one of claims 1-4, characterized in that: The high-pressure nitrogen pipeline (3) is equipped with a start-up gas nitrogen distribution valve (33) and a high-pressure nitrogen check valve (34), and the nitrogen branch pipe (6) is connected between the start-up gas nitrogen distribution valve (33) and the high-pressure nitrogen check valve (34).
6. The water-coal slurry acceleration device as described in claim 5, characterized in that: Downstream of the downstream shut-off valve (12), there are three start-up fuel gas check valves (13), and the nitrogen branch pipe (6) is connected between the first start-up fuel gas check valve (13) and the second start-up fuel gas check valve (13).