Coal slurry diversion control system and control method

Abstract

The invention discloses a coal slurry diversion control system and method, and belongs to the field of coal slurry diversion control. The control system comprises: a coal water slurry feeding pipeline, which comprises a feeding header pipe and at least two feeding branch pipes; one end of each coal water slurry discharging pipeline is connected with the main feeding pipe, the other end of each coal water slurry discharging pipeline is communicated to a coal slurry tank, and each coal water slurry discharging pipeline comprises at least two rigid pipelines and at least one flexible pipeline; and the output end of the lifting assembly acts on the rigid pipeline between the adjacent flexible pipelines or the rigid pipeline between the flexible pipeline and the outlet of the coal water slurry discharging pipeline, so that the rigid pipeline ascends or descends. The problem that an existing coal slurry diversion control mode is high in energy consumption is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water-coal slurry diversion, and in particular to a coal slurry diversion control system and a control method. Background Art

[0002] Coal-water slurry is a new, efficient and clean coal-based fuel. It is a new member of the fuel family. It is a mixture of 65%-70% coal with different particle size distribution, about 29-34% water and about 1% chemical additives. After multiple rigorous processes, impurities such as unburnable components in coal are screened out, and only the carbon essence is retained, which becomes the essence of coal-water slurry. It has the same fluidity as oil, and its calorific value is equivalent to half of that of oil. It is called liquid coal product. Coal-water slurry technology includes key technologies such as coal-water slurry preparation, storage and transportation, combustion, and additives. It is a systematic technology involving multiple disciplines. Coal-water slurry has the characteristics of high combustion efficiency and low pollutant emissions. It can be used for power station boilers, industrial boilers and industrial kilns to replace oil, gas, and coal combustion, as well as various buildings such as hotels, residences, hotels, and office buildings for heating and domestic hot water. It is an important part of today's clean coal technology.

[0003] Water-coal slurry is made by adding coal, water and additives to a coal mill and grinding the coal mill. The water-coal slurry is pumped to a coal slurry tank for storage and use in a gasifier. In order to ensure that the water-coal slurry in the coal slurry tank is sufficient for the gasifier and that the gasifier production is not affected when the coal mill stops due to a fault, it is required that there is sufficient storage capacity for the water-coal slurry in the coal slurry tank. Generally, at least two or three coal slurry tanks are set up for water-coal slurry gasification. The material level of the coal slurry tank needs to be controlled to be relatively stable to avoid the impact of material level fluctuations on the inlet pressure of the high-pressure coal slurry pump and the operating status of the coal slurry tank agitator. The material level control of the coal slurry tank is generally controlled by a water-coal slurry diverter. At present, a common coal slurry diversion control system is controlled by a "human" shaped diverter with a diversion flap inside to control the water-coal slurry to enter different coal slurry tanks only through one side. This type of diversion control system is set at a higher position, generally about ten meters above the top of the coal slurry tank. Due to the high height and the high viscosity of the water-coal slurry, this type of coal slurry diversion control system invisibly increases the energy consumption of the coal slurry pump. Moreover, this diversion control system can only divert the coal slurry to the coal slurry tank on one side, which brings certain difficulties to the material level control of the coal slurry tank. In addition, this diverter flap is very easy to wear, and when the flap is worn, it will have a certain impact on the coal slurry diversion. How to ensure that the coal slurry diversion can be freely controlled and reduce energy consumption has become an urgent problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is the high energy consumption of the existing coal slurry diversion control method.

[0005] In view of the above technical problems, the present invention provides the following technical solutions:

[0006] A coal slurry diversion control system comprises: a water-coal slurry feed pipeline, including a feed main pipe and at least two feed branches; at least two groups of water-coal slurry discharge pipelines, one end of the water-coal slurry discharge pipeline is connected to the feed main pipe, and the other end is connected to a coal slurry tank, and the water-coal slurry discharge pipeline comprises at least two sections of rigid pipelines and at least one section of flexible pipeline; a lifting component, the output end of the lifting component acts on the rigid pipeline between adjacent flexible pipelines or on the rigid pipeline between the flexible pipeline and the outlet of the water-coal slurry discharge pipeline to raise or lower the rigid pipeline.

[0007] In some embodiments of the present invention, a control device is further included, which controls the lifting assembly to switch between a first position and a second position. When the lifting assembly is in the first position, the extension direction of the water-coal slurry discharge pipeline is consistent; when the lifting assembly is in the second position, at least one section of the rigid pipeline of the water-coal slurry discharge pipeline is inconsistent with the extension direction of other pipelines.

[0008] In some embodiments of the present invention, a first switch valve is provided on the water-coal slurry discharge pipeline, and the first switch valve is located on a rigid pipeline close to one side of the feed main pipe; a second switch valve is provided on the feed branch pipe.

[0009] In some embodiments of the present invention, the lifting assembly is a hydraulic lifting assembly, which includes a hydraulic cylinder and a hydraulic control assembly for controlling the lifting of the hydraulic cylinder.

[0010] In some implementation modes of the present invention, the rigid pipeline and the flexible pipeline are both made of metal, and the rigid pipeline and the flexible pipeline are connected via a flange.

[0011] In some embodiments of the present invention, the water-coal slurry discharge pipeline includes a first section of a rigid pipeline, a flexible pipeline, and a second section of a rigid pipeline connected in sequence, the first section of the rigid pipeline is a straight pipe extending in a horizontal direction, the second section of the rigid pipeline is a bent pipe, the bent pipe includes a first pipe section extending in a first direction and a second pipe section extending in a second direction, wherein the first pipe section is connected to the flexible pipeline, and the end of the second pipe section forms the outlet of the water-coal slurry discharge pipeline.

[0012] In some embodiments of the present invention, the output end of the lifting assembly acts on the first pipe segment of the second section of the rigid pipeline. When the lifting assembly is in the first position, the first pipe segment is in a state of extending in the horizontal direction under the action of the lifting assembly; when the lifting assembly is in the second position, the first pipe segment is tilted upward relative to the horizontal direction under the action of the lifting assembly.

[0013] In some embodiments of the present invention, a liquid level detection device is provided in the coal slurry tank.

[0014] The present invention also provides a control method for the coal slurry diversion system, comprising:

[0015] When the liquid level of the coal slurry tank is lower than the first threshold, the lifting assembly is controlled to be in the first position so that the extension direction of the water-coal slurry discharge pipeline remains consistent;

[0016] When the liquid level of the coal slurry tank is higher than the second threshold value, the lifting assembly is controlled to be in the second position, so that at least one section of the rigid pipeline of the water-coal slurry discharge pipeline is inconsistent with the extension direction of other pipelines.

[0017] In some implementations of the present invention, a first switch valve is provided on the water-coal slurry discharge pipeline, and when the liquid level in the coal slurry tank is higher than a third threshold value, the first switch valve is controlled to close.

[0018] The technical solution of the present invention has the following technical effects compared with the prior art:

[0019] In the coal slurry diversion control system provided by the present invention, the water-coal slurry discharge pipeline is set to at least two sections of rigid pipelines and at least one section of flexible pipeline, and a lifting component is set to control the rise or fall of one section of the rigid pipeline, so that a throttling effect is formed at the connection between the rigid pipeline and the flexible pipeline to change the flow through the water-coal slurry discharge pipeline, thereby controlling the liquid level of the water-coal slurry entering the coal slurry tank. The diversion system does not need to set up components such as diverters, and can stably control the material level of the coal slurry tank only by controlling the lifting component. It has a simple structure, low maintenance cost, and is easier to isolate when the coal slurry tank is overhauled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0021] Figure 1 A system principle diagram of a specific implementation of the coal slurry diversion control system of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a specific implementation of a water-coal slurry discharge pipeline in the coal slurry diversion control system of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 The figure shows a specific implementation of the coal slurry diversion control system provided by the present invention, which is used to controllably transport the water-coal slurry of the coal slurry pump pipeline of the mill to the coal slurry tank. The diversion control system includes a water-coal slurry feed pipeline 10 and at least two groups of water-coal slurry discharge pipelines 20, wherein the water-coal slurry feed pipeline 10 includes a main feed pipe 11 and at least two feed branch pipes 12, and the feed branch pipes 12 are respectively connected to the water-coal slurry supply tank obtained by grinding the coal mill through a coal slurry pump. Specifically, a second switch valve 121 is provided on the feed branch pipe 12; one end of the water-coal slurry discharge pipeline 20 is connected to the main feed pipe 11, and the other end is connected to the coal slurry tank 30, as shown in FIG. Figure 2 As shown, the water-coal slurry discharge pipeline 20 includes at least two sections of rigid pipelines 21 and at least one section of flexible pipeline 22; the diversion control system also includes a lifting component 40, the output end of the lifting component 40 acts on the rigid pipeline 21 between adjacent flexible pipelines 22 or the rigid pipeline 21 between the flexible pipeline 22 and the outlet of the water-coal slurry discharge pipeline 20 to raise or lower the rigid pipeline 21.

[0028] In the above-mentioned coal slurry diversion control system, the water-coal slurry discharge pipeline 20 is set to at least two sections of rigid pipelines 21 and at least one section of flexible pipeline 22, and a lifting assembly 40 is set to control one section of the rigid pipeline 21 to swing around the flexible pipeline 22 to achieve elevation or lowering, and a throttling effect is formed at the connection between the rigid pipeline 21 and the flexible pipeline 22 to change the flow through the water-coal slurry discharge pipeline 20, thereby controlling the liquid level of the water-coal slurry entering the coal slurry tank 30. The diversion system can realize the diversion operation without setting components such as diverters, and the material level of the coal slurry tank 30 can be stably controlled by controlling the lifting assembly 40. It has a simple structure and low maintenance cost. It is also easier to isolate the coal slurry tank 30 when it is overhauled.

[0029] Specifically, the coal slurry diversion control system includes a control device, which controls the lifting assembly 40 to switch between a first position and a second position. When the lifting assembly 40 is in the first position, the extension direction of the water-coal slurry discharge pipeline 20 is consistent, and the flow rate of the water-coal slurry discharge pipeline 20 is Q1; when the lifting assembly 40 is in the second position, at least a section of the rigid pipeline 21 of the water-coal slurry discharge pipeline 20 is inconsistent with the extension direction of other pipelines, and the flow rate of the water-coal slurry discharge pipeline 20 is Q2, wherein Q1>Q2.

[0030] Specifically, the water-coal slurry discharge pipeline 20 is provided with a first switch valve 23, which is located on the rigid pipeline 21 close to the feeding main pipe 11. When the liquid level of a coal slurry tank 30 is too high, the supply of water-coal slurry can be directly cut off by controlling the first switch valve 23 on the water-coal slurry discharge pipeline 20 where it is located to be closed.

[0031] Specifically, in an optional embodiment, the lifting assembly 40 is a hydraulic lifting assembly 40, which includes a hydraulic cylinder and a hydraulic control assembly for controlling the lifting of the hydraulic cylinder. The hydraulic control assembly includes a hydraulic pump and a control valve group, etc. The piston rod end of the hydraulic cylinder is fixedly connected to the outer wall of the rigid pipeline 21 through a flange to drive the rigid pipeline 21 to swing up and down around the flexible pipeline 22.

[0032] Specifically, in an optional implementation manner, the rigid pipeline 21 and the flexible pipeline 22 are both made of metal, and the rigid pipeline 21 and the flexible pipeline 22 are connected via a flange.

[0033] Specifically, in an optional embodiment, the water-coal slurry discharge pipeline 20 includes a first section of a rigid pipeline 21, a flexible pipeline 22 and a second section of a rigid pipeline 21 connected in sequence, the first section of the rigid pipeline 21 is connected to the feed main pipe 11, and extends in a horizontal direction, the second section of the rigid pipeline 21 is a bent pipe, and the bent pipe includes a first pipe segment 211 extending in a first direction and a second pipe segment 212 extending in a second direction, wherein the first pipe segment 211 is connected to the flexible pipeline 22, and the end of the second pipe segment 212 forms the outlet of the water-coal slurry discharge pipeline 20.

[0034] Specifically, in an optional embodiment, the piston rod of the hydraulic cylinder in the hydraulic lifting assembly 40 acts on the first pipe segment 211 of the second section of the rigid pipeline 21, and specifically, the end of the piston rod is connected to an area of ​​the first pipe segment 211 that is a certain distance away from the flexible pipeline 22; when the lifting assembly 40 is in the first position, the first pipe segment 211 is in a state of extending in the horizontal direction under the action of the lifting assembly 40; when the lifting assembly 40 is in the second position, the first pipe segment 211 is tilted upward relative to the horizontal direction under the action of the lifting assembly 40.

[0035] The above-mentioned coal slurry flow distribution system includes three groups of water-coal slurry discharge pipelines 20. By respectively controlling the water-coal slurry flow rates of the three groups of water-coal slurry discharge pipelines 20, reasonable distribution of the flow rates of the three groups of coal slurry tanks can be achieved.

[0036] The coal slurry tank 30 is provided with a liquid level detection device for detecting the liquid level height of the water-coal slurry in the coal slurry tank 30 .

[0037] The present invention also provides a control method for the above-mentioned coal slurry diversion system, comprising:

[0038] When the liquid level of the coal slurry tank 30 is lower than the first threshold, the lifting assembly 40 is controlled to be in the first position, so that the extension direction of the water-coal slurry discharge pipeline 20 remains consistent, and the water-coal slurry in the water-coal slurry discharge pipeline 20 is transported at a flow rate Q1 to quickly increase the liquid level of the coal slurry tank 30;

[0039] Specifically, the piston rod of the hydraulic cylinder in the lifting assembly 40 is controlled to be in a retracted position, so that the first pipe section 211 is in a state of extending in the horizontal direction to be consistent with the extension direction of other pipe sections, and the water-coal slurry flows in the water-coal slurry discharge pipeline 20 at a maximum flow rate;

[0040] When the liquid level of the coal slurry tank 30 is higher than the second threshold, the lifting assembly 40 is controlled to be in the second position, so that at least one section of the rigid pipeline 21 of the water-coal slurry discharge pipeline 20 is inconsistent with the extension direction of other pipelines, the water-coal slurry in the water-coal slurry discharge pipeline 20 is transported at a flow rate Q2, flows at a slower speed, and the liquid level of the coal slurry tank 30 rises slowly;

[0041] Specifically, the piston rod of the hydraulic cylinder in the lifting assembly 40 is controlled to be in the extended position, so that the first pipe section 211 is swung upward around the flexible pipeline 22 at a certain angle, so that the first pipe section 211 is in a state of being tilted upward in the horizontal direction, and a throttle is formed at the connection between the first pipe section 211 and the flexible pipeline 22, and the water-coal slurry flows at a low speed in the water-coal slurry discharge pipeline 20;

[0042] By means of the above control method, the water-coal slurry flow rates of the three groups of water-coal slurry discharge pipelines 20 can be automatically controlled respectively, so that the water-coal slurry liquid level of each coal slurry tank is maintained within a reasonable height range.

[0043] Furthermore, in an optional embodiment, a first switch valve 23 is provided on the water-coal slurry discharge pipeline 20. When the liquid level of the coal slurry tank 30 is higher than a third threshold value, the first switch valve 23 is controlled to close, and the supply to the water-coal slurry discharge pipeline 20 where the first switch valve 23 is located is stopped. The water-coal slurry in the feed main pipe 11 is delivered to other coal slurry tanks 30 through other parallel water-coal slurry discharge pipelines 20.

[0044] Furthermore, in an optional embodiment, when the liquid levels of multiple groups of water-coal slurry discharge pipelines 20 are all higher than the fourth threshold value, at least one group of the second switch valves 121 is controlled to be closed to reduce the supply of feed amount, wherein the second threshold value < the fourth threshold value < the third threshold value. Specifically, in an optional embodiment, when there are three groups of water-coal slurry discharge pipelines 20, when the liquid levels of the three groups of water-coal slurry discharge pipelines 20 are all higher than the fourth threshold value, one group of the second switch valves 121 is controlled to be closed, and when the liquid levels of the three groups of water-coal slurry discharge pipelines 20 are still higher than the fourth threshold value after the first predetermined time is reached, two groups of the second switch valves 121 are controlled to be closed, and the above steps are repeated until the liquid level of any one of the three groups of water-coal slurry discharge pipelines 20 is lower than the fourth threshold value.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A coal slurry diversion control system, characterized in that: include: A water-coal slurry feed pipeline, comprising a feed main pipe and at least two feed branch pipes; At least two groups of water-coal slurry discharge pipelines, one end of each of which is connected to the feed main pipe and the other end is connected to the coal slurry tank, and each of which includes at least two sections of rigid pipelines and at least one section of flexible pipeline; A lifting component, the output end of which acts on the rigid pipeline between adjacent flexible pipelines or on the rigid pipeline between the flexible pipeline and the outlet of the water-coal slurry discharge pipeline to raise or lower the rigid pipeline.

2. A coal slurry flow diversion control system according to claim 1, characterized in that: It also includes a control device, which controls the lifting assembly to switch between a first position and a second position. When the lifting assembly is in the first position, the extension direction of the water-coal slurry discharge pipeline is consistent; when the lifting assembly is in the second position, at least one section of the rigid pipeline of the water-coal slurry discharge pipeline is inconsistent with the extension direction of other pipelines.

3. A coal slurry flow diversion control system according to claim 1 or 2, characterized in that: A first switch valve is provided on the water-coal slurry discharge pipeline, and the first switch valve is located on a rigid pipeline close to one side of the feed main pipe; a second switch valve is provided on the feed branch pipe.

4. A coal slurry flow diversion control system according to claim 1 or 2, characterized in that: The lifting assembly is a hydraulic lifting assembly, which includes a hydraulic cylinder and a hydraulic control assembly for controlling the lifting of the hydraulic cylinder.

5. A coal slurry flow diversion control system according to claim 1 or 2, characterized in that: The rigid pipeline and the flexible pipeline are both made of metal, and the rigid pipeline and the flexible pipeline are connected via a flange.

6. A coal slurry flow diversion control system according to claim 1 or 2, characterized in that: The water-coal slurry discharge pipeline includes a first section of rigid pipeline, a flexible pipeline and a second section of rigid pipeline connected in sequence, the first section of rigid pipeline is a straight pipe extending in a horizontal direction, the second section of rigid pipeline is a bent pipe, and the bent pipe includes a first pipe section extending in a first direction and a second pipe section extending in a second direction, wherein the first pipe section is connected to the flexible pipeline, and the end of the second pipe section forms the outlet of the water-coal slurry discharge pipeline.

7. A coal slurry flow diversion control system according to claim 6, characterized in that: The output end of the lifting component acts on the first pipe section of the second section of the rigid pipeline. When the lifting component is in the first position, the first pipe section is in a state of extending in the horizontal direction under the action of the lifting component; when the lifting component is in the second position, the first pipe section is tilted upward relative to the horizontal direction under the action of the lifting component.

8. A coal slurry flow diversion control system according to claim 1 or 2, characterized in that: A liquid level detection device is arranged in the coal slurry tank.

9. A method for controlling a coal slurry diversion system according to any one of claims 1 to 8, characterized in that: include: When the liquid level of the coal slurry tank is lower than the first threshold, the lifting assembly is controlled to be in the first position so that the extension direction of the water-coal slurry discharge pipeline remains consistent; When the liquid level of the coal slurry tank is higher than the second threshold value, the lifting assembly is controlled to be in the second position, so that at least one section of the rigid pipeline of the water-coal slurry discharge pipeline is inconsistent with the extension direction of other pipelines.

10. The control method of the coal slurry diversion system according to claim 9, characterized in that: include: The water-coal slurry discharge pipeline is provided with a first switch valve, and when the liquid level of the coal slurry tank is higher than the third threshold value, the first switch valve is controlled to close.

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