Waste neutralizing and coal blending device for coking production and working method

Abstract

The invention relates to the technical field of coking production environmental protection, and particularly discloses a waste neutralization coal blending device for coking production and a working method.The waste neutralization coal blending device comprises a mixing tank and a sludge temporary storage tank, a stirring device is installed in the mixing tank, and a bottom outlet of the mixing tank communicates with an inlet of a grinding pump through a pipeline; an outlet of the grinding pump communicates with an inlet of the first conveying pump through a pipeline, an outlet of the first conveying pump communicates with a first temporary storage tank inlet in the top of the sludge temporary storage tank through a pipeline, and a bottom outlet of the sludge temporary storage tank communicates with an inlet of the second conveying pump through a pipeline. An outlet of the second conveying pump is communicated with a top temporary storage tank inlet II of the sludge temporary storage tank through a pipeline, so that the sludge in the sludge temporary storage tank returns to the sludge temporary storage tank through the second conveying pump; an outlet of the second conveying pump is communicated with a material distributing device through a pipeline, and the material distributing device is located over the first coal conveying belt; according to the invention, innocent treatment of acidic waste generated in the coking industry is realized, and generation of hydrogen chloride is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection in coking production, and in particular to a waste neutralization and coal blending device and a working method for coking production. Background Art

[0002] Coking crude benzene is an important chemical product in the coking industry with high economic value. The updated quality standard of YB / T5022-2016 "Crude benzene" has added a new chlorine content index for crude benzene, requiring the chlorine content in the crude benzene product for processing to be ≤15mg / kg, in order to reduce the adverse effects on subsequent crude benzene deep processing equipment.

[0003] In the coking production process, some waste materials that are difficult to handle are generated. These waste materials are highly polluting and difficult to handle alone. They are usually mixed with coking coal for treatment. Such as coking sludge, desulfurization and denitration condensate, activated carbon (coke) powder, coking concentrated salt (brine), etc. These waste materials usually contain high concentrations of acidic substances (such as ammonium chloride, sulfurous acid, sulfuric acid, nitric acid, etc.), chloride ions or magnesium ions. These substances will react and release hydrogen chloride gas during the high-temperature coking process. Hydrogen chloride gas reacts with active organic matter such as indene in the coal gas at high temperature to generate organic chlorides such as 1-chloroindane. These organic chlorides enter the coking benzene stripping device with the coal gas, causing the chlorine content in the coking crude benzene product produced to exceed the standard, seriously affecting the quality of the crude benzene product. How to eliminate the adverse effects of waste coal blending on the quality of crude benzene has become an important issue that needs to be solved urgently in the coking industry.

[0004] The reaction pathways that have been tested and discovered include:

[0005] Step 1: Generate Hydrogen Chloride

[0006]

[0007] Step 2: Generate organic chlorides, such as Figure 1 shown.

[0008] Patent Application No. 202310425193 discloses a device for co - firing pulverized coal with sludge, which adopts a technical scheme of adding steam coal for secondary stirring to carry out reduction, harmless treatment, resource utilization and large - scale treatment of sludge, effectively reducing the emission of harmful substances and environmental pollution. At the same time, the sludge is mixed into the pulverized coal and burned in the boiler, enabling the pulverized coal and other energy substances with a certain calorific value in the sludge to be fully burned and utilized in the boiler for power generation, turning the sludge into a valuable resource and creating new value from waste energy recovery. This scheme is a conventional sludge blending scheme for coal blending, which only solves the problem of uniformly blending coking sludge into coking coal and cannot solve the adverse effects on coking crude benzene products after blending waste materials with coal, thus unable to achieve ideal results. Therefore, a waste neutralization and coal blending device and working method for coking production are designed to solve the problem of the increase in the chlorine content of coking crude benzene caused by blending waste materials with coal. Summary of the Invention

[0009] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a waste neutralization and coal blending device and working method for coking production to eliminate the adverse effects of blending waste materials with coal on the quality of coking crude benzene products.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a waste neutralization and coal blending device for coking production, including a blending tank and a sludge storage tank. A stirring device is installed in the blending tank. The bottom outlet of the blending tank is connected to the inlet of a grinding pump through a pipeline, the outlet of the grinding pump is connected to the inlet of a first delivery pump through a pipeline, the outlet of the first delivery pump is connected to the top inlet one of the sludge storage tank through a pipeline, and the bottom outlet of the sludge storage tank is connected to the inlet of a second delivery pump through a pipeline. The outlet of the second delivery pump is connected to the top inlet two of the sludge storage tank through a pipeline, so that the sludge in the sludge storage tank can return to the sludge storage tank through the second delivery pump.

[0011] The outlet of the second delivery pump is connected to a feeding device through a pipeline, and the feeding device is directly above the first coal conveyor belt.

[0012] Specifically, the upper part of the blending tank is provided with a blending inlet one, a blending inlet two and a blending inlet three. The blending inlet one is connected to a pipeline for pumping acidic wastewater, the blending inlet two is connected to a pipeline for pumping coking sludge, and the blending inlet three is connected to a pipeline for activated carbon powder and liquid alkali.

[0013] The stirring device in the blending tank adopts a stirring frame, which is installed on the middle shaft. The upper part of the middle shaft is connected to the motor shaft of the stirring motor, and the stirring motor is installed outside the blending tank. A first liquid level gauge is provided at the top of the blending tank to detect the liquid level of the blending tank, and the first liquid level gauge adopts a radar liquid level gauge.

[0014] Specifically, the bottom of the blending tank adopts a conical structure, and the included angle a between the bottom plate of the conical structure at the bottom of the blending tank and the horizontal line is ≥ the angle of repose of the waste after blending.

[0015] Specifically, a second liquid level gauge is provided at the top of the sludge temporary storage tank. The second liquid level gauge is used to detect the liquid level of the sludge temporary storage tank, and the second liquid level gauge adopts a radar liquid level gauge.

[0016] Specifically, the bottom of the sludge temporary storage tank adopts a conical structure, and the included angle b between the bottom plate of the conical structure of the sludge temporary storage tank and the horizontal line is ≥ the angle of repose of the waste after blending.

[0017] Specifically, a first valve is provided on the pipeline from the second delivery pump to the sludge temporary storage tank, a second valve is provided on the pipeline from the second delivery pump to the cloth-feeding device, and a flow meter is provided on the pipeline from the second delivery pump to the cloth-feeding device. The flow meter is used to measure the coal blending flow rate, and the flow meter adopts an electromagnetic flow meter.

[0018] Specifically, the cloth-feeding device is a combined structure of single or multiple large-aperture fan-shaped nozzles. The cloth-feeding device evenly sprays the blended material on the first coal conveying belt. The first coal conveying belt is arranged between the coal tower and the pulverizer, and a second coal conveying belt is arranged between the pulverizer and the coal blending scale.

[0019] A working method of a waste neutralization and coal blending device for coking production includes the following steps:

[0020] S1. The coking sludge sent by the coking sewage pump is sent into the blending tank and mixed with one or several kinds of wastes such as acidic wastewater, concentrated brine, and waste activated carbon powder sent by other devices in the blending tank. Then, liquid alkali is added to the blending tank, and the stirring device is started to fully mix the materials to obtain a mixed slurry.

[0021] S2. The mixed slurry obtained in step S1 is first ground by a grinding pump. After removing the residual large-particle solids in the mixed slurry, it is sent to the sludge temporary storage tank for temporary storage by a first delivery pump.

[0022] S3. When the first coal conveying belt is not running, the first valve is opened and the second valve is closed. The mixed sludge stored in the sludge temporary storage tank in step S2 is pumped from the bottom by the second delivery pump and sent back to the top of the sludge temporary storage tank to keep the materials in the sludge temporary storage tank flowing and prevent the sludge from being blocked due to long-term static settlement.

[0023] S4. When the first coal conveying belt is running, the first valve is closed and the second valve is opened. The mixed sludge stored in the sludge temporary storage tank is pumped from the bottom by the second delivery pump and sent to the cloth-feeding device to evenly spray the mixed sludge on the blended coal on the first coal conveying belt.

[0024] Specifically, a neutralizing agent is added to the blending tank in step S1, and the neutralizing agent is sodium hydroxide or potassium hydroxide.

[0025] Specifically, the stirring time of the stirring device in step S1 is ≥ 60 min to obtain a mixed slurry with a water content of 80%-95% and a pH value of 11-14.

[0026] The present invention has the following beneficial effects:

[0027] The waste neutralization and coal blending device and working method for coking production designed by the present invention realize the harmless treatment of acidic waste generated in the coking industry and solve the problem of high operating costs brought by the separate disposal of such waste.

[0028] The waste neutralization and coal blending device and working method for coking production designed by the present invention use sodium hydroxide or potassium hydroxide as a neutralizing agent to convert harmful inorganic chlorides and free hydrogen chloride into magnesium hydroxide and hardly decomposable sodium chloride salts, which can effectively prevent the generation of hydrogen chloride and block the reaction conditions for the generation of organic chlorides, effectively reducing the generation of organic chlorides;

[0029] Reaction principle: NH 4 Cl + NaOH → NaCl + NH 3 ↑ + H 2 O;

[0030] MgCl 2 + 2NaOH → Mg(OH) 2 + 2NaCl;

[0031] Mg(OH)Cl + NaOH → Mg(OH) 2 + NaCl.

[0032] The waste neutralization and coal blending device and working method for coking production designed by the present invention solve the problem of excessive crude benzene chlorides caused by conventional acidic waste coal blending in the coking industry, greatly improve the quality of coking crude benzene, ensure the quality stability of coking crude benzene, and have great popularization significance in the coking industry. Description of the Drawings

[0033] Figure 1 It is a reaction schematic diagram for generating organic chlorides in existing tests.

[0034] Figure 2 It is a structural schematic diagram of a waste neutralization and coal blending device for coking production.

[0035] In the figure: 1 - blending tank, 101 - stirring device, 102 - stirring motor, 103 - first liquid level gauge, 104 - blending inlet 1, 105 - blending inlet 2, 106 - blending inlet 3;

[0036] 2 - Grinding pump; 3 - First transfer pump; 4 - Sludge storage tank, 401 - Second liquid level gauge, 402 - First inlet of the storage tank, 403 - Second inlet of the storage tank;

[0037] 5 - Second transfer pump; 6 - Feeding device; 7 - First valve; 8 - Second valve; 9 - Flowmeter; 10 - Coal tower; 11 - Crusher; 12 - Coal blending scale; 13 - First coal conveyor belt; 14 - Second coal conveyor belt. Detailed implementation mode

[0038] The technical solutions in the embodiments of the present invention will be further described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figure 2 shown, a waste neutralization and coal blending device for coking production includes a blending tank 1, a grinding pump 2, a first transfer pump 3, a sludge storage tank 4, a second transfer pump 5, and a feeding device 6. A stirring device 101 is installed in the blending tank 1. The stirring device 101 in the blending tank 1 adopts a stirring frame, the stirring frame is installed on the middle shaft, the upper part of the middle shaft is connected to the motor shaft of the stirring motor 102, and the stirring motor 102 is installed outside the blending tank 1.

[0040] The bottom outlet of the blending tank 1 is connected to the inlet of the grinding pump 2 through a pipeline, the outlet of the grinding pump 2 is connected to the inlet of the first transfer pump 3 through a pipeline, the outlet of the first transfer pump 3 is connected to the first inlet 402 of the top of the sludge storage tank 4 through a pipeline, the bottom outlet of the sludge storage tank 4 is connected to the inlet of the second transfer pump 5 through a pipeline, and the outlet of the second transfer pump 5 is connected to the second inlet 403 of the top of the sludge storage tank 4 through a pipeline, so that the sludge in the sludge storage tank 4 returns to the sludge storage tank 4 through the second transfer pump 5; a first valve 7 is provided on the pipeline from the second transfer pump 5 to the sludge storage tank 4, a second valve 8 is provided on the pipeline from the second transfer pump 5 to the feeding device 6, and a flowmeter 9 is provided on the pipeline from the second transfer pump 5 to the feeding device 6. The flowmeter 9 is used to measure the coal blending flow rate, and the flowmeter 9 adopts an electromagnetic flowmeter.

[0041] The outlet of the second transfer pump 5 is connected to the feeding device 6 through a pipeline, and the feeding device 6 is directly above the first coal conveyor belt 13. The feeding device 6 is a combined structure of single or multiple large-aperture fan-shaped nozzles. The feeding device 6 evenly sprays the blended materials on the first coal conveyor belt 13. The first coal conveyor belt 13 is arranged between the coal tower 10 and the crusher 11, and a second coal conveyor belt 14 is arranged between the crusher 11 and the coal blending scale 12.

[0042] Above the blending tank 1, there are a first blending inlet 104, a second blending inlet 105, and a third blending inlet 106. The first blending inlet 104 is connected to the pipeline for pumping acidic wastewater, the second blending inlet 105 is connected to the pipeline for pumping coking sludge, and the third blending inlet 106 is connected to the pipeline for activated carbon powder and liquid caustic soda.

[0043] On the top of the blending tank 1, there is a first liquid level gauge 103, which is used to detect the liquid level of the blending tank 1. The first liquid level gauge 103 adopts a radar liquid level gauge.

[0044] The bottom of the blending tank 1 adopts a conical structure, and the included angle a between the bottom plate of the conical structure of the blending tank 1 and the horizontal line is ≥ the angle of repose of the waste after blending.

[0045] On the top of the sludge storage tank 4, there is a second liquid level gauge 401, which is used to detect the liquid level of the sludge storage tank 4. The second liquid level gauge 401 adopts a radar liquid level gauge.

[0046] The bottom of the sludge storage tank 4 adopts a conical structure, and the included angle b between the bottom plate of the conical structure of the sludge storage tank 4 and the horizontal line is ≥ the angle of repose of the waste after blending.

[0047] A working method of a waste neutralization and coal blending device for coking production includes the following steps:

[0048] 1. The coking sludge sent by the coking sewage pump is sent into the blending tank, and is mixed with one or several kinds of wastes such as acidic wastewater, concentrated brine, and waste activated carbon powder sent by other devices in the blending tank. Then, liquid caustic soda is added into the blending tank, and the stirring device is started to fully mix the materials. The stirring time of the stirring device is ≥ 60 min, and a mixed slurry with a water content of 80%-95% and a pH value of 11-14 is obtained.

[0049] 2. The mixed slurry obtained in step S1 is first ground by a grinding pump. After removing the large particle solids remaining in the mixed slurry, it is sent to the sludge storage tank for temporary storage by a first transfer pump.

[0050] 3. When the first coal conveying belt is not running, open the first valve and close the second valve. The mixed sludge stored in the sludge storage tank in step S2 is pumped out by the second transfer pump at the bottom and sent back to the top of the sludge storage tank to keep the materials in the sludge storage tank flowing and prevent the sludge from being blocked due to long-term static settlement.

[0051] 4. When the first coal conveying belt is running, close the first valve and open the second valve. The mixed sludge stored in the sludge storage tank is pumped out by the second transfer pump at the bottom and sent to the feeding device, so that the mixed sludge is evenly sprayed on the blended coal of the first coal conveying belt.

[0052] The pH of the finally obtained mixed mud is 11 - 14, and the neutralizing agent added to the blending tank 1 is sodium hydroxide or potassium hydroxide. Alkali metal strong bases such as calcium hydroxide or magnesium hydroxide are not allowed to be used as substitutes to ensure that hydrogen ions, ammonium ions, and magnesium ions in the waste are completely fixed or transformed and no longer transformed or hydrogen chloride is generated during the coking process.

[0053] The stirring time after adding liquid caustic soda to the blending tank 1 is ≥ 60 min, so that the liquid caustic soda fully enters the interior of the colloid in the mixed mud to eliminate the existing wrapping phenomenon and ensure thorough neutralization.

[0054] The water content of the finally obtained mixed mud in the blending tank 1 is 80% - 95%. On the premise of ensuring the fluidity of the mixed sludge, the coal blending moisture is reduced to the greatest extent, and the energy consumption of the waste coal blending is reduced.

[0055] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

[0056] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A waste neutralization and coal blending device for coking production, characterized in that: It comprises a blending tank and a sludge temporary storage tank, wherein a stirring device is installed in the blending tank, the bottom outlet of the blending tank is connected to the inlet of a grinding pump through a pipeline, the outlet of the grinding pump is connected to the inlet of a first delivery pump through a pipeline, the outlet of the first delivery pump is connected to the first inlet of the top temporary storage tank of the sludge temporary storage tank through a pipeline, the bottom outlet of the sludge temporary storage tank is connected to the inlet of a second delivery pump through a pipeline, the outlet of the second delivery pump is connected to the second inlet of the top temporary storage tank of the sludge temporary storage tank through a pipeline, and the sludge in the sludge temporary storage tank is returned to the sludge temporary storage tank through the second delivery pump; The outlet of the second delivery pump is connected to the material distribution device through a pipeline, and the material distribution device is located directly above the first coal conveying belt.

2. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: The upper part of the mixing tank is provided with a mixing inlet 1, a mixing inlet 2 and a mixing inlet 3, the mixing inlet 1 is connected to a pipeline for pumping acidic wastewater, the mixing inlet 2 is connected to a pipeline for pumping coking sludge, and the mixing inlet 3 is connected to a pipeline for activated carbon powder and liquid alkali; The stirring device in the mixing tank adopts a stirring frame, which is installed on an intermediate shaft. The upper part of the intermediate shaft is connected to the motor shaft of the stirring motor. The stirring motor is installed outside the mixing tank. A first liquid level meter is provided on the top of the mixing tank. The first liquid level meter is used to detect the liquid level of the mixing tank. The first liquid level meter adopts a radar level meter.

3. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: The bottom of the blending tank adopts a conical structure, and the angle a between the bottom plate of the conical structure at the bottom of the blending tank and the horizontal line is ≥ the repose angle of the waste after blending.

4. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: A second liquid level gauge is provided on the top of the sludge temporary storage tank, and the second liquid level gauge is used to detect the liquid level of the sludge temporary storage tank. The second liquid level gauge is a radar liquid level gauge.

5. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: The bottom of the sludge temporary storage tank adopts a conical structure, and the angle b between the bottom plate of the conical structure of the sludge temporary storage tank and the horizontal line is greater than or equal to the repose angle of the waste after mixing.

6. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: A first valve is provided on the pipeline from the second delivery pump to the sludge temporary storage tank, a second valve is provided on the pipeline from the second delivery pump to the distribution device, and a flow meter is provided on the pipeline from the second delivery pump to the distribution device. The flow meter is used to measure the coal distribution flow rate, and the flow meter adopts an electromagnetic flow meter.

7. The waste neutralization and coal blending device for coking production according to claim 1, characterized in that: The material distribution device is a combination structure of a single or multiple large-aperture fan-shaped nozzles. The material distribution device allows the mixed material to be evenly sprayed on the coal conveyor belt one. The coal conveyor belt one is arranged between the coal tower and the crusher, and the coal conveyor belt two is arranged between the crusher and the coal blending scale.

8. The working method of the waste neutralization and coal blending device for coking production according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The coking sludge delivered by the coking sewage pump is sent to a blending tank, and mixed with one or more waste materials such as acidic wastewater, concentrated brine, and waste activated carbon powder delivered by other devices in the blending tank, and then liquid alkali is added to the blending tank, and a stirring device is turned on to fully mix the materials to obtain mixed sludge; S2, grinding the mixed sludge obtained in step S1 by a grinding pump to eliminate the large solid particles remaining in the mixed sludge, and then delivering it to the sludge temporary storage tank through a first delivery pump for temporary storage; S3, when the coal conveyor belt is not in operation, the first valve is opened and the second valve is closed, and the mixed sludge stored in the sludge temporary storage tank in step S2 is pumped out by the second delivery pump at the bottom and sent back to the top of the sludge temporary storage tank, so that the material in the sludge temporary storage tank keeps flowing to prevent the sludge from being blocked due to long-term standing; S4. When the coal conveyor belt 1 is started, close the first valve, open the second valve, and pump the mixed sludge stored in the sludge temporary storage tank to the distribution device through the second delivery pump at the bottom, so that the mixed sludge is evenly sprayed on the matching coal of the coal conveyor belt 1.

9. The working method of the waste neutralization and coal blending device for coking production according to claim 8, characterized in that: In the step S1, a neutralizing agent is added into the blending tank, and the neutralizing agent is sodium hydroxide or potassium hydroxide.

10. The working method of the waste neutralization and coal blending device for coking production according to claim 8, characterized in that: The stirring time of the stirring device in step S1 is ≥60 min, and a mixed slurry with a water content of 80%-95% and a pH value of 11-14 is obtained.

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