Device for reducing waste slurry discharge and improving utilization

Abstract

The utility model relates to the technical field of coal chemical industry, and provides a device for reducing waste slurry discharge and improving utilization, which comprises a waste coal slurry storage tank, a coal slurry pump, a raw coal bunker, a coal feeder, a coal mill and a discharge chute, the bottom of the waste coal slurry storage tank is connected with a slurry discharge pipe, the coal slurry pump is arranged on the slurry discharge pipe, a first connecting flange is arranged on the slurry discharge pipe, a second connecting flange is arranged on an articulated chute of the coal mill, a conveying hose is arranged between the first connecting flange and the second connecting flange, the raw coal bunker is connected with the coal feeder, and the coal feeder is connected with the coal mill. The coal feeder is connected with the coal mill, and the coal mill is connected with the discharge chute. The slurry discharging pipe is communicated with the elephant trunk through the conveying hose, so that the waste coal slurry in the waste coal slurry storage tank can be reused and mixed with coarse coal to be ground into qualified coal slurry to be used by the gasification furnace, and the coal slurry conveying device has good environmental protection property, economical efficiency and safety.

Description

Technical Field

[0001] This application belongs to the field of coal chemical technology, and more specifically, relates to a device for reducing waste slurry discharge and improving utilization. Background Technology

[0002] The coal-water slurry gasification technology involves mixing water and raw coal in a coal mill to produce a qualified coal slurry. This slurry is then incompletely combusted with pure oxygen in a gasifier to produce crude coal gas, primarily composed of carbon monoxide and hydrogen, which is used as raw material for subsequent processes. The slurry preparation wastewater used in this plant contains approximately 6% high-salt caprolactam wastewater, with a COD exceeding 100,000 PPM, ammonia nitrogen exceeding 2,000 PPM, and a small amount of toxic benzene, classifying it as hazardous waste. It also frequently contains hydrogen peroxide and other waste liquids, resulting in a strong odor. Previously treated by incineration, this wastewater is now mixed with raw coal in a specific ratio to produce coal-water slurry for use in the gasifier, offering advantages in environmental friendliness, economy, and safety.

[0003] The slurry preparation system of the coal-water slurry gasification unit may produce coal slurry that does not meet the process specifications due to various reasons. This slurry cannot be used as feedstock for the gasifier to produce crude syngas and must be disposed of as waste slurry. In the initial stage of the unit, due to equipment failure, more than 1400 tons of substandard coal slurry containing 60% caprolactam was generated. Discharging this hazardous waste on-site would inevitably cause environmental pollution, failing to meet regulatory requirements and causing the system's wastewater discharge to exceed standards. Hazardous waste disposal is costly; treating the waste coal slurry as waste increases coal usage costs. During operation, waste slurry is repeatedly generated in the coal slurry discharge trough, and existing hazardous waste coal slurry discharge and treatment methods are clearly insufficient. Utility Model Content

[0004] In view of the technical problems of high difficulty, high cost and environmental unfriendliness in the treatment of waste slurry in the prior art, the purpose of this application is to provide a device for reducing waste slurry discharge and improving utilization, which has the advantages of waste slurry reuse, low treatment cost, environmental protection and reduced coal cost.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A device for reducing waste slurry discharge and improving utilization is provided, comprising: a waste coal slurry storage tank, a coal slurry pump, a raw coal bunker, a coal feeder, a coal mill, and a discharge trough; the bottom of the waste coal slurry storage tank is connected to a slurry discharge pipe, the coal slurry pump is mounted on the slurry discharge pipe, a first connecting flange is provided on the slurry discharge pipe, a second connecting flange is provided on the chute of the coal mill, a conveying hose is provided between the first connecting flange and the second connecting flange, the raw coal bunker is connected to the coal feeder, the coal feeder is connected to the coal mill, and the coal mill is connected to the discharge trough.

[0006] In one embodiment, the coal slurry pump is a variable frequency coal slurry pump.

[0007] In one embodiment, the delivery hose comprises at least two metal hoses connected in series.

[0008] In one embodiment, the slurry discharge pipe is provided with multiple branch pipes at intervals, each branch pipe is provided with the first connecting flange and the switch valve, the conveying hose is provided with multiple hoses at intervals, and the chute is provided with multiple second connecting flanges at intervals.

[0009] In one embodiment, the metal hose is a stainless steel metal hose.

[0010] In one embodiment, the metal ointment is a DN80 metal tube.

[0011] The beneficial effects of the device for reducing waste slurry discharge and improving utilization provided in this application are as follows: Compared with the prior art, by connecting the discharge pipe and the chute through the conveying hose, the waste coal slurry in the waste coal slurry storage tank can be reused and mixed with coarse coal to be ground into qualified coal slurry for use in the gasification furnace, which has good environmental protection, economy and safety. 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 of the device for reducing waste slurry discharge and improving utilization provided in the embodiments of this application.

[0014] The following are the labeling elements in the figure:

[0015] 1. Waste coal slurry storage tank; 2. Coal slurry pump; 3. Raw coal bunker; 4. Coal feeder; 5. Coal mill; 6. Discharge chute; 7. Slurry discharge pipe; 8. First connecting flange; 9. Chute; 10. Second connecting flange; 11. Conveying hose; 12. Branch pipe; 13. Switch valve; 14. Slurry water; 15. Additives. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] like Figure 1 As shown, an apparatus for reducing waste slurry discharge and improving utilization provided in this application embodiment will now be described. This apparatus includes: a waste coal slurry storage tank 1, a coal slurry pump 2, a raw coal bunker 3, a coal feeder 4, a coal mill 5, and a discharge chute 6. The waste coal slurry storage tank 1, the raw coal bunker 3, the coal feeder 4, the coal mill 5, and the discharge chute 6 are all existing equipment in the factory. The improvement in this embodiment is that a discharge pipe 7 is connected to the bottom of the waste coal slurry storage tank 1. One end of the discharge pipe 7 is connected to the waste coal slurry storage tank 1, and the other end is equipped with a valve for opening and closing. The coal slurry pump 2 is installed on the discharge pipe 7, and a first connecting flange 8 is provided on the discharge pipe 7. A second connecting flange 10 is provided on the chute 9 of the coal mill 5. A conveying hose 11 is provided between the first connecting flange 8 and the second connecting flange 10 for a sealed connection. The raw coal bunker 3 is connected to the coal feeder 4, the coal feeder 4 is connected to the coal mill 5, the coal mill 5 is connected to the discharge chute 6, and the chute is also connected to the slurry preparation water 14 and the additive 15. The coal slurry in the discharge chute 6 is sent to the coal slurry tank by the low-pressure coal slurry pump 2, and the coal slurry in the coal slurry tank is sent to the gasifier by the high-pressure coal slurry pump 2, where it undergoes an incomplete reaction with pure oxygen to produce crude syngas.

[0021] The coal slurry pump 2 is used to pump waste coal slurry into the chute, where it is mixed with raw coal, slurry water 14 and additives 15 and then reprocessed into qualified coal slurry in the coal mill 5.

[0022] Specifically, the coal slurry pump 2 is a variable frequency coal slurry pump 2. The frequency of the variable frequency coal slurry pump 2 can be adjusted to control a certain proportion to grind qualified coal slurry for use in the gasifier.

[0023] Specifically, when the distance between the slurry discharge pipe 7 and the chute 9 is short, the conveying hose 11 is a single metal hose; when the distance between the slurry discharge pipe 7 and the chute 9 is long, depending on the specific distance, the conveying hose 11 includes at least two metal hoses connected in series, and adjacent metal hoses are also connected by a flange seal.

[0024] To further control the ratio of waste coal slurry to raw coal, multiple branch pipes 12 are spaced apart on the slurry discharge pipe 7. Each branch pipe 12 is equipped with a first connecting flange 8 and a switch valve 13. Multiple conveying hoses 11 are spaced apart, and multiple second connecting flanges 10 are spaced apart on the chute 9. When the demand for waste coal slurry is large, the switch valves 13 on the corresponding number of branch pipes 12 can be opened according to the actual situation, so that multiple conveying hoses 11 can supply waste coal slurry simultaneously.

[0025] Specifically, the metal hose is a stainless steel metal hose, preferably a DN80 metal hose with a pressure rating of 300 psi. It has the advantages of readily available material, low cost, and sufficient spare quantity.

[0026] The device for reducing waste slurry discharge and improving utilization provided in this embodiment utilizes existing slurry preparation equipment without changing the existing operating methods. It only uses a metal flexible hose connected via a flange to transport the waste coal slurry from the waste coal slurry storage tank 1 to the coal mill 5 for regrinding with raw coal to produce coal slurry. Simultaneously, a certain proportion is controlled by adjusting the frequency converter of the coal slurry pump 2 to produce qualified coal slurry for use in the gasification furnace. This avoids environmental pollution, occupational health accidents, and environmental incidents such as exceeding the standards for ash water discharge from the system, which would otherwise result from hazardous waste being discharged into the slag pit. It also saves considerable hazardous waste disposal costs and avoids increasing coal usage costs by treating waste slurry as hazardous waste. It has good environmental protection, economic efficiency, and safety.

[0027] 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. An apparatus for reducing waste slurry discharge and increasing utilization, comprising: The utility model relates to a coal slurry pump system of coal slurry preparation system, including: The waste coal slurry storage tank (1) is connected with the slurry discharge pipe (7) in the bottom, the coal slurry pump (2) is arranged on the slurry discharge pipe (7), the first connecting flange (8) is equipped on the slurry discharge pipe (7), the chute (9) of the coal mill (5) is equipped with the second connecting flange (10), the first connecting flange (8) and the second connecting flange (10) are equipped with the conveying hose (11) between, the raw coal bunker (3) is connected with the coal feeder (4), the coal feeder (4) is connected with the coal mill (5), and the coal mill (5) is connected with the discharge chute (6).

2. The apparatus of claim 1, wherein: The coal slurry pump (2) is a variable frequency coal slurry pump.

3. The apparatus of claim 2, wherein: The conveying hose (11) includes at least two metal hoses connected in series.

4. The apparatus of claim 3, wherein: Multiple branch pipes (12) are arranged on the slurry discharge pipe (7) at intervals, and the first connecting flange (8) and the on-off valve (13) are arranged on each branch pipe (12).

5. The apparatus of claim 4, wherein: The metal hose is a stainless steel metal hose.

6. The apparatus of claim 5, wherein: The metal hose is a DN80 metal hose.

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