Coal slime dehydration process

Abstract

The invention provides a coal slime dehydration process which comprises a feeding unit, and the feeding unit is provided with a feeding channel; an inlet of the preheating unit communicates with the feeding channel so as to preheat the materials conveyed from the feeding channel to form a preheated product; an inlet of the dehydration unit is communicated with an outlet of the preheating unit so as to dehydrate the preheating product conveyed from the preheating unit to form a dehydration product, the dehydration product comprises dry coal slime and saturated water, and an outlet of the dehydration unit is used for being communicated with an inlet of the preheating unit so as to convey the saturated water into the preheating unit to supply energy to the preheating unit; the gasification unit is used for conveying at least part of gasification products into the feeding unit; the problems of low coal slime dehydration rate and low efficiency in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal slime dehydration, and in particular to a coal slime dehydration process. Background Art

[0002] Coal slime, as a byproduct of coal washing, has long been regarded as a waste that is difficult to handle due to its characteristics, such as high moisture content (up to 70%-90%), high ash content, high viscosity and low calorific value. These characteristics not only limit the direct use of coal slime, but also cause many inconveniences in storage and transportation. In particular, the high moisture content of coal slime leads to low energy density and poor economic benefits. At the same time, if it is not handled properly, it may also cause environmental pollution.

[0003] The traditional way to utilize coal slime is to use it as a fuel in the boiler of a thermal power plant to reduce resource waste and environmental pollution. However, due to the high water content of coal slime, direct mixing will consume a lot of heat energy for water evaporation, thereby reducing boiler efficiency and increasing operating costs. In addition, the transportation and storage of coal slime are also difficult. The high viscosity makes it easy to form blockages in pipelines, and the high water content makes it difficult to store in open air environments.

[0004] At present, the dehydration treatment technologies for coal slime mainly include direct drying, filter press dehydration, centrifuge dehydration and filter dehydration. Among them, the direct drying method has low energy consumption, but is limited by weather and site, and has low efficiency; filter press and centrifuge dehydration can effectively reduce the moisture content of coal slime, but the energy consumption is relatively high and the equipment is seriously worn; filter dehydration is suitable for coal slime with low moisture content. In recent years, with the increasingly stringent environmental protection policies in my country, the requirements for coal slime dehydration have been continuously improved, and traditional dehydration methods can no longer meet the needs. Summary of the invention

[0005] The main purpose of the present invention is to provide a coal slime dehydration process to solve the problems of low coal slime dehydration rate and low efficiency in the prior art.

[0006] In order to achieve the above object, according to one aspect of the present invention, a coal slime dehydration process is provided, comprising:

[0007] A feeding unit, wherein the feeding unit has a feeding channel;

[0008] A preheating unit, the inlet of which is connected to the feeding channel, so as to preheat the material transported from the feeding channel to form a preheated product;

[0009] A dehydration unit, wherein the inlet of the dehydration unit is connected to the outlet of the preheating unit so as to dehydrate the preheating product transported from the preheating unit to form a dehydrated product, wherein the dehydrated product includes dry coal slime and saturated water, and the outlet of the dehydration unit is used to be connected to the inlet of the preheating unit so as to transport the saturated water into the preheating unit to provide energy for the preheating unit.

[0010] A gasification unit, wherein the inlet of the gasification unit is connected to the outlet of the dehydration unit, and the outlet of the gasification unit is connected to the feeding unit to gasify the dry coal slime output from the dehydration unit to generate gasification products, and to transport at least part of the gasification products to the feeding unit, wherein the gasification products include gasification gas and gasification slag.

[0011] Further, the preheating unit comprises: a primary preheater, the inlet of the primary preheater is connected to the feeding channel to perform primary preheating on the material and form a primary preheating product;

[0012] The inlet of the secondary preheater is connected to the outlet of the primary preheater to perform secondary preheating on the primary preheating product and generate a preheating product.

[0013] Further, the dehydration unit comprises: a hydrothermal reactor, the inlet of which is connected to the outlet of the secondary preheater, so as to hydrothermally dehydrate the secondary preheating product and generate a dehydrated product;

[0014] A filter press, the inlet of the filter press is connected to the outlet of the hydrothermal reactor to filter and dehydrate the dehydrated product to generate dry coal slime and saturated water;

[0015] Wherein, the outlet of the filter press is connected to the inlet of the primary preheater; and / or, the temperature of the saturated water is 60° C. to 120° C., and / or, the moisture content of the dry coal slime is less than 30%.

[0016] Further, the gasification unit comprises: a gasifier, the inlet of the gasifier is connected to the outlet of the dehydration unit to gasify 20% to 40% of the dry coal slime output from the dehydration unit to generate a gasification product;

[0017] The outlet of the gasifier is communicated with the feeding unit to transport the gasified slag into the feeding unit as a flotation agent to select materials from the original materials stored in the feeding unit.

[0018] Furthermore, the coal slime dehydration process further comprises: a burner, the outlet end of the burner being connected to the inlet of the hydrothermal reactor in the dehydration unit to provide energy for the hydrothermal reactor to perform hydrothermal dehydration;

[0019] The outlet end of the burner is also connected to the gasifier to provide energy for the gasifier to gasify the dry coal slime;

[0020] The outlet end of the gasifier is also communicated with the inlet end of the burner so as to transport the gasification gas in the gasification product to the burner.

[0021] Furthermore, the coal slime dehydration process also includes: a flue gas processor, the inlet of the flue gas processor is connected to the outlet of the burner, and the outlet of the flue gas processor is connected to the secondary preheater in the preheating unit to treat the exhaust gas generated by the burner, and the treated exhaust gas is transported to the secondary preheater to preheat the primary preheating product formed by preheating in the first preheater to form a preheating product.

[0022] Furthermore, the coal slime dehydration process also includes: a wastewater pool, the inlet of which is connected to the outlet of the primary preheater to collect wastewater generated by the primary preheater after preheating the material.

[0023] Furthermore, the feeding unit comprises: a storage bin in which raw materials are stored;

[0024] A flotation tank, the inlet of which is connected to the outlet of the storage bin, so that the original material transported from the storage bin is floated under the action of a flotation agent to obtain the material;

[0025] The water content of the material is 80% to 95%.

[0026] Furthermore, the hydrothermal temperature of the hydrothermal reactor is 120°C to 240°C.

[0027] Furthermore, the temperature of the gas generated by the burner is 200°C to 300°C.

[0028] By applying the technical solution of the present invention, the moisture content of the dry coal slime after treatment by this process can be reduced to below 30%. Compared with the traditional coal slime dehydration method, the drying efficiency of the coal slime is greatly improved, making it more suitable for direct utilization and transportation, and improving the calorific value and energy utilization efficiency of the coal slime.

[0029] The preheating unit uses the saturated water produced by the dehydration unit for preheating. This design realizes energy recycling, which not only reduces the consumption of external energy, but also improves the energy efficiency of the entire system and reduces the energy consumption cost during the dehydration process.

[0030] The preheating step allows the coal slime to be preheated before dehydration, which can accelerate the evaporation of water, improve the processing efficiency of dehydration equipment such as filter presses, shorten the coal slime dehydration cycle, and help improve the production efficiency of the entire process.

[0031] The recycling of saturated water reduces wastewater discharge and the impact on the environment. At the same time, the low-water content dry coal slime produces less pollutants during combustion or gasification, further improving the environmental performance of the process. At the same time, the inlet of the gasification unit is also used to connect with the outlet of the dehydration unit to transport the gasified slag in the gasification product generated by the gasification unit to the feeding unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 A flow chart of a coal slime dehydration process according to an embodiment of the present application is shown.

[0034] The above drawings include the following reference numerals:

[0035] 1. Primary preheater; 2. Secondary preheater; 3. Hydrothermal reactor; 4. Filter press; 5. Gasifier; 6. Burner; 7. Flue gas treatment device; 8. Wastewater pool; 9. Storage silo; 10. Flotation tank. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Coal slime, as a byproduct of coal washing, has long been regarded as a waste that is difficult to handle due to its characteristics, such as high moisture content (up to 70%-90%), high ash content, high viscosity and low calorific value. These characteristics not only limit the direct use of coal slime, but also cause many inconveniences in storage and transportation. In particular, the high moisture content of coal slime leads to low energy density and poor economic benefits. At the same time, if it is not handled properly, it may also cause environmental pollution.

[0038] The traditional way to utilize coal slime is to use it as a fuel in the boiler of a thermal power plant to reduce resource waste and environmental pollution. However, due to the high water content of coal slime, direct mixing will consume a lot of heat energy for water evaporation, thereby reducing boiler efficiency and increasing operating costs. In addition, the transportation and storage of coal slime are also difficult. The high viscosity makes it easy to form blockages in pipelines, and the high water content makes it difficult to store in open air environments.

[0039] At present, the dehydration treatment technologies for coal slime mainly include direct drying, filter press dehydration, centrifuge dehydration and filter dehydration. Among them, the direct drying method has low energy consumption, but is limited by weather and site, and has low efficiency; filter press and centrifuge dehydration can effectively reduce the moisture content of coal slime, but the energy consumption is relatively high and the equipment is seriously worn; filter dehydration is suitable for coal slime with low moisture content. In recent years, with the increasingly stringent environmental protection policies in my country, the requirements for coal slime dehydration have been continuously improved, and traditional dehydration methods can no longer meet the needs.

[0040] The main purpose of the present invention is to provide a coal slime dehydration process to solve the problems of low coal slime dehydration rate and low efficiency in the prior art.

[0041] The present application provides a coal slime dehydration process, comprising: a feeding unit, the feeding unit having a feeding channel;

[0042] A preheating unit, the inlet of which is connected to the feeding channel, so as to preheat the material transported from the feeding channel to form a preheated product;

[0043] A dehydration unit, wherein the inlet of the dehydration unit is connected to the outlet of the preheating unit to dehydrate the preheating product delivered from the preheating unit to form a dehydrated product, wherein the dehydrated product includes dry coal slime and saturated water, and the outlet of the dehydration unit is used to communicate with the inlet of the preheating unit to deliver the saturated water to the preheating unit to provide energy for the preheating unit;

[0044] A gasification unit, wherein the inlet of the gasification unit is connected to the outlet of the dehydration unit, and the outlet of the gasification unit is connected to the feeding unit to gasify the dry coal slime output from the dehydration unit to generate gasification products, and to transport at least part of the gasification products to the feeding unit, wherein the gasification products include gasification gas and gasification slag.

[0045] Specifically, Figure 1 As shown, the present application provides a coal slime dehydration process, including a feeding unit having a feeding channel, the outlet of the feeding unit is connected to the preheating unit to transport materials to the preheating unit through the feeding channel, the preheating unit preheats the materials to form a preheating product, and the preheating product is transported to the dehydration unit for dehydration to form a dehydrated product, the dehydrated product includes dry coal slime and saturated water, and after the dehydration process of the present application, the water content of the dry coal slime after final dehydration is less than 30%.

[0046] The moisture content of dry coal slime after treatment by this process can be reduced to below 30%. Compared with traditional coal slime dehydration methods, the drying efficiency of coal slime is greatly improved, making it more suitable for direct use and transportation, and improving the calorific value and energy utilization efficiency of coal slime.

[0047] The preheating unit uses the saturated water produced by the dehydration unit for preheating. This design realizes energy recycling, which not only reduces the consumption of external energy, but also improves the energy efficiency of the entire system and reduces the energy consumption cost during the dehydration process.

[0048] The preheating step allows the coal slime to be preheated before dehydration, which can accelerate the evaporation of water, improve the processing efficiency of dehydration equipment such as filter presses, shorten the coal slime dehydration cycle, and help improve the production efficiency of the entire process.

[0049] The recycling of saturated water reduces wastewater discharge and environmental impact. At the same time, the low-water content of dry coal slime produces less pollutants during combustion or gasification, further improving the environmental performance of the process.

[0050] Further, the preheating unit comprises: a primary preheater 1, the inlet of the primary preheater 1 is connected to the feeding channel to perform primary preheating on the material and form a primary preheating product;

[0051] The inlet of the secondary preheater 2 is connected to the outlet of the primary preheater 1 to perform secondary preheating on the primary preheating product and generate a preheating product.

[0052] Specifically, in this embodiment, the preheating unit includes a primary preheater 1, which is used to preheat the material transported from the loading unit and obtain a primary preheating product. The primary preheating product is transported to the secondary preheater 2, which performs secondary preheating and forms a preheating product.

[0053] The primary preheater 1 first uses a relatively low temperature heat source to preheat the saturated water from the dehydration unit to preliminarily preheat the material, so that the temperature of the material gradually increases, reducing the thermal shock when the material contacts the high temperature heat source, and improving the uniformity and efficiency of preheating. Subsequently, the secondary preheater 2 uses a higher temperature heat source, such as the high temperature flue gas generated by the burner 6, to preheat the material at a deeper level, ensuring that the material reaches the ideal pre-dehydration temperature, thereby improving the efficiency of the subsequent dehydration steps.

[0054] The design of the primary preheater 1 and the secondary preheater 2 realizes the cascade utilization of energy. The lower temperature heat source used in the primary preheating process, such as saturated water, is effectively utilized in this embodiment, reducing the demand for high-quality energy. The secondary preheater 2 uses high-temperature flue gas to further increase the temperature of the material, while also ensuring that the waste heat of the high-temperature flue gas can be fully recovered and utilized, avoiding energy waste and reducing overall energy consumption.

[0055] Through the combination of primary preheating and secondary preheating, the material has reached an ideal preheating state before entering the dehydration unit, which helps to improve the dehydration performance of the material, reduce energy consumption during the dehydration process, and improve dehydration efficiency. The preheating process makes it easier for the moisture in the material to evaporate, so that dry coal slime is formed faster in the dehydration unit, reducing the load of the dehydration equipment and extending the service life of the equipment.

[0056] The dual preheating mechanism helps to stabilize the material temperature, avoids the impact of temperature fluctuations on the dehydration unit, and enhances the stability and reliability of the entire system. The optimization of the preheating process also provides more stable raw materials for the subsequent gasification and combustion units, improving the efficiency of gasification and combustion.

[0057] Furthermore, the dehydration unit comprises: a hydrothermal reactor 3, the inlet of the hydrothermal reactor 3 is connected to the outlet of the secondary preheater 2, so as to perform hydrothermal dehydration on the secondary preheating product and generate a dehydrated product.

[0058] A filter press 4, the inlet of which is connected to the outlet of the hydrothermal reactor 3, so as to filter and dehydrate the dehydrated product to generate dry coal slime and saturated water;

[0059] The outlet of the filter press 4 is connected to the inlet of the primary preheater 1; and / or the temperature of the saturated water is 60° C. to 120° C., and / or the moisture content of the dry coal slime is less than 30%.

[0060] Specifically, the dehydration unit includes a hydrothermal reactor 3, the inlet of the hydrothermal reactor 3 is connected to the outlet of the secondary preheater 2, so that the secondary preheating product can be hydrothermally dehydrated to generate a dehydrated product, and the dehydrated product is transported to the filter press 4 for filter pressing and dehydration. After filter pressing and dehydration, dry coal slime and saturated water are generated. The temperature of the generated saturated water is 60°C to 120°C, and the water content of the obtained dry coal slime is less than 30%.

[0061] The hydrothermal reactor 3 utilizes high temperature and high pressure conditions to perform hydrothermal dehydration on the secondary preheating product. This process can significantly accelerate the evaporation of water, so that most of the water is removed from the material before entering the filter press, so that when further dehydrated in the filter press 4, dry coal slime with a water content of less than 30% can be more effectively generated, thereby improving the depth and efficiency of dehydration.

[0062] The temperature of the saturated water generated in the hydrothermal reactor 3 is controlled at 60°C to 120°C. This part of the heat energy is recovered and used for the primary preheating of the material in the preheating unit, realizing the cascade utilization and closed-loop circulation of energy, reducing the energy consumption of the entire system and improving the energy utilization efficiency.

[0063] The moisture content of the dry coal slime after being treated by the hydrothermal reactor 3 and the filter press 4 is significantly reduced, which not only improves the calorific value and economic benefits of the coal slime, but also facilitates subsequent storage, transportation and utilization, and reduces transportation costs and energy utilization efficiency problems caused by high moisture content.

[0064] The recycling of saturated water reduces waste liquid discharge and reduces environmental pollution. At the same time, the efficient dehydration of the hydrothermal reactor 3 and the filter press 4 reduces energy consumption in the subsequent combustion or gasification process and reduces pollutant emissions, reflecting the environmental protection and energy-saving characteristics of the process.

[0065] Further, the gasification unit comprises: a gasifier 5, the inlet of the gasifier 5 is connected to the outlet of the dehydration unit to gasify 20% to 40% of the dry coal slime output from the dehydration unit to generate gasification gas and gasification slag;

[0066] The outlet of the gasifier 5 is communicated with the feeding unit to transport the gasified slag to the feeding unit as a flotation agent to select materials from the original materials stored in the feeding unit.

[0067] Specifically, the coal slime dehydration process also includes a gasifier 5 connected to the dehydration unit to gasify part of the dry coal slime output from the dehydration unit to form gasification gas and gasification slag, and the gasification slag is used as a flotation agent to be transported to the feeding unit, and the original material transported by the feeding unit is floated to obtain material for dehydration.

[0068] The reuse of gasification slag as a flotation agent achieves efficient recovery and resource utilization of by-products in the process of coal slime treatment, reduces waste emissions, and improves the comprehensive utilization rate of resources. This closed-loop resource utilization model reduces the demand for new resources, reduces processing costs, and also reduces the impact on the environment.

[0069] The gasification gas can be used as the fuel of the burner 6 to provide heat energy for the hydrothermal reactor 3 and support the operation of the dehydration unit. This not only reduces the dependence on external energy and reduces energy consumption, but also improves the self-sufficiency of the system and enhances the energy utilization efficiency and economy of the system.

[0070] Fumed slag contains certain active ingredients and structures. When used as a flotation agent, it can improve the flotation performance of coal slime, increase flotation efficiency and selectivity, and thus obtain higher quality materials for subsequent dehydration. This helps to improve the quality of dry coal slime in the entire system and increase its market value.

[0071] The recycling of gasification slag and gasification gas establishes a stable connection between the dehydration unit and the gasifier, which helps the stability and controllability of the system operation. This collaborative working mode reduces the possible fluctuations in system operation and improves the overall efficiency and reliability of the system.

[0072] The recycling of gasified slag reduces the burden on the environment. At the same time, due to the recycling of energy within the system, the consumption of fossil fuels is reduced, greenhouse gas emissions are reduced, which meets the requirements of green production and reflects the environmental protection characteristics of this process.

[0073] Furthermore, the coal slime dehydration process further includes: a burner 6, the outlet end of the burner 6 is connected to the inlet of the hydrothermal reactor 3 in the dehydration unit to provide energy for the hydrothermal reactor 3 to perform hydrothermal dehydration;

[0074] The outlet end of the burner 6 is also connected to the gasifier 5 to provide energy for the gasifier 5 to gasify the dry coal slime;

[0075] The outlet end of the gasifier 5 is also communicated with the inlet end of the burner 6 so as to transport the gasification gas in the gasification product to the burner 6 .

[0076] Specifically, it also includes a burner 6 connected to the inlet of the hydrothermal reactor 3 in the dehydration unit, which is used to provide energy for the hydrothermal dehydration reaction of the hydrothermal reactor 3. The outlet end of the burner 6 is also connected to the gasifier 5, and can also provide energy for the gasifier 5 to gasify the dry coal slime.

[0077] The burner 6 directly provides heat energy for the hydrothermal reactor 3, ensuring the efficient hydrothermal dehydration process. At the same time, the heat energy of the burner 6 can also be used for gasification of dry coal slime in the gasifier, realizing the optimal distribution and cascade utilization of energy in the system and improving the overall energy efficiency.

[0078] As the heat source center, the burner 6 can continuously and stably provide the required heat for the hydrothermal reactor 3 and the gasifier 5, ensuring the continuity and stability of the dehydration and gasification process and reducing the loss of production efficiency caused by heat source fluctuations.

[0079] The fuel of the burner 6 can be materials recycled from within the system, such as some dry coal slime. This not only reduces dependence on external fuel and reduces operating costs, but also realizes the resource utilization of waste and increases the economic benefits of the system. The gasification gas generated by the gasifier 5 can be input into the burner 6 to provide energy for the burner 6.

[0080] Furthermore, the coal slime dehydration process also includes: a flue gas processor 7, the inlet of the flue gas processor 7 is connected to the outlet of the burner 6, and the outlet of the flue gas processor 7 is connected to the secondary preheater 2 in the preheating unit to treat the exhaust gas generated by the burner 6, and the treated exhaust gas is transported to the secondary preheater 2 to preheat the primary preheating product formed by preheating in the first preheater 1 to form a preheating product.

[0081] Specifically, the flue gas processor 7 purifies the exhaust gas generated by the burner, effectively removing harmful substances such as particulate matter, sulfide, nitrogen oxide, etc., reducing pollution to the environment. At the same time, the treated exhaust gas still carries a large amount of waste heat, which is transported to the secondary preheater 2, realizing the recovery and reuse of heat energy and improving the comprehensive utilization rate of energy.

[0082] The waste gas heat energy output by the flue gas processor 7 is used for secondary preheating of the material in the secondary preheater 2. This process can heat the material to a temperature close to that required by the hydrothermal reactor 3, reducing the energy consumption of the hydrothermal reactor 3, while improving the temperature uniformity and preheating efficiency of the material before entering the hydrothermal reactor 3, creating better conditions for hydrothermal dehydration.

[0083] The combination of the flue gas processor 7 and the secondary preheater 2 not only solves the environmental problem of exhaust gas emissions, but also optimizes the energy flow of the system through the cascade utilization of thermal energy, reduces the demand for high-quality energy, and reduces the overall energy consumption of the system.

[0084] The purification of waste gas reduces pollutant emissions, while the recovery and utilization of heat energy reduces dependence on traditional energy and reduces greenhouse gas emissions, reflecting the environmentally friendly characteristics of this process and meeting the requirements of green production.

[0085] The recovery and utilization of waste gas heat energy reduces the need for auxiliary heating equipment, thereby reducing the construction and operation costs of the system. At the same time, it improves the economic efficiency of the production process by reducing energy consumption and waste disposal costs.

[0086] Furthermore, the coal slime dehydration process also includes: a wastewater pool 8, the inlet of the wastewater pool 8 is connected to the outlet of the primary preheater 1 to collect wastewater generated by the primary preheater 1 after preheating the material.

[0087] Specifically, when the primary preheater 1 preheats the material, it will discharge wastewater containing a certain amount of heat. Direct discharge not only wastes energy, but may also have an impact on the environment. By introducing the wastewater into the wastewater pool, the wastewater can be centrally managed, providing the possibility for subsequent wastewater treatment or reuse. For example, the wastewater can be used as cooling water in other production links after cooling, or recycled as process water after purification.

[0088] The provision of the wastewater pool 8 helps to avoid direct discharge of untreated wastewater, reducing the risk of contamination of surface water and groundwater. Centralized treatment of wastewater can also ensure that harmful substances in the wastewater are effectively removed, meet national or local emission standards, and reduce environmental risks.

[0089] The wastewater discharged from the primary preheater 1 usually carries a certain amount of heat energy, which can be temporarily stored in the wastewater pool 8, providing conditions for the subsequent use or treatment of the wastewater. For example, the wastewater can be used as a heat source for heating or hot water supply, reducing the dependence on traditional heat sources such as boilers, and achieving energy conservation and emission reduction.

[0090] The wastewater pool 8 collects and preliminarily treats the wastewater, which helps to realize the recycling of water resources and reduce the consumption of fresh water. This measure is of great significance for saving water resources and reducing production costs, especially in areas where water resources are scarce.

[0091] The setting of the wastewater tank 8 improves the material flow and energy flow cycle of the entire system, enhances the coordination between the various units and the self-sufficiency of the system as a whole. Reasonable management and reuse of wastewater helps to improve the stability and economy of the system.

[0092] Further, the feeding unit comprises: a storage bin 9, in which the raw materials are stored;

[0093] The flotation cell 10 has an inlet connected to the outlet of the storage bin 9, so that the original material transported from the storage bin 9 is floated under the action of the flotation agent to obtain the material; wherein the water content of the material is 80% to 95%.

[0094] Specifically, the storage bin 9 can store a large amount of raw materials to provide a stable supply of raw materials for subsequent processing procedures. This helps to reduce the frequent entry and exit of raw materials, reduces energy consumption and costs in the material processing process, and also facilitates the orderly management and pre-processing of materials.

[0095] The flotation tank 10 performs flotation treatment on the raw material under the action of the flotation agent. This process can effectively separate the useful components and useless components in the material and improve the purity and quality of the material. By controlling the water content of the material between 80% and 95%, it can ensure that the material has a better treatment effect in the subsequent dehydration and gasification process, while reducing energy consumption.

[0096] The moisture content of the material after flotation treatment is controlled within a relatively high range, which provides sufficient moisture for the subsequent dehydration unit, allowing the hydrothermal reactor 3 and the filter press 4 and other equipment to operate more efficiently, thereby improving the efficiency and capacity of the entire dehydration process.

[0097] The moisture content of the material is controlled between 80% and 95%, avoiding the material state of being too dry or too wet, and reducing the energy consumption in the subsequent processing process. For example, too dry material requires additional humidification before entering the hydrothermal reactor 3, while too wet material will increase the dehydration burden of the hydrothermal reactor 3. Controlling the moisture content within this range helps optimize the system energy efficiency.

[0098] The gasified slag produced during the flotation process is re-introduced into the flotation tank 10 as a flotation agent. This closed-loop utilization model maximizes the use of internal system resources, reduces the demand for new resources, reduces costs, and also reduces waste emissions, reflecting the concept of resource conservation and environmental protection.

[0099] Furthermore, the hydrothermal temperature of the hydrothermal reactor 3 is 120°C to 240°C.

[0100] Furthermore, the temperature of the gas generated by the burner 6 is 200°C to 300°C.

[0101] Specifically, the hydrothermal temperature of the hydrothermal reactor 3 is set between 120°C and 240°C, which is an ideal temperature range for hydrothermal reaction, and can accelerate the separation of water from the coal slime, promote the dehydration process of the coal slime, and improve the dehydration efficiency. At the same time, reasonable control of temperature also helps to avoid excessive decomposition of materials during the processing process, ensuring the quality of the dehydrated coal slime.

[0102] The temperature of the gas generated by the burner 6 is set between 200°C and 300°C. This temperature range can ensure sufficient combustion, improve combustion efficiency, and reduce the emission of unburned materials. At the same time, the heat energy at this temperature can be effectively used by the secondary preheater 2 to preheat the material twice, thereby reducing the energy consumption of the hydrothermal reactor 3 and improving the overall thermal energy utilization efficiency of the system.

[0103] Precisely controlling the temperature of the hydrothermal reactor 3 and the burner 6 helps the system to operate stably, avoiding equipment damage or poor treatment results caused by excessively high or low temperatures. Stable temperature control is also a key factor in achieving automation and intelligent management of the entire process.

[0104] After the high-temperature gas generated by the burner 6 is processed by the flue gas processor, the exhaust gas can meet the environmental protection standard, reducing the pollution to the environment. At the same time, by improving the combustion efficiency and heat recovery rate, the energy consumption of the system is reduced and the operating cost is reduced.

[0105] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0106] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0107] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0108] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0109] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal slime dehydration process, characterized in that: include: A feeding unit, wherein the feeding unit has a feeding channel; A preheating unit, the inlet of which is in communication with the feeding channel, so as to preheat the material transported from the feeding channel to form a preheated product; a dehydration unit, wherein the inlet of the dehydration unit is connected to the outlet of the preheating unit to dehydrate the preheating product transported from the preheating unit to form a dehydrated product, wherein the dehydrated product comprises dry coal slime and saturated water, and the outlet of the dehydration unit is used to communicate with the inlet of the preheating unit to transport the saturated water into the preheating unit to provide energy for the preheating unit; A gasification unit, wherein the inlet of the gasification unit is connected to the outlet of the dehydration unit, and the outlet of the gasification unit is connected to the feeding unit to gasify the dry coal slime output from the dehydration unit to generate gasification products, so as to transport at least part of the gasification products to the feeding unit, wherein the gasification products include gasification gas and gasification slag.

2. The coal slime dehydration process according to claim 1, characterized in that: The preheating unit comprises: A primary preheater (1), the inlet of the primary preheater (1) being in communication with the feeding channel, so as to perform primary preheating on the material and form a primary preheating product; A secondary preheater (2), wherein the inlet of the secondary preheater (2) is connected to the outlet of the primary preheater (1) so as to perform secondary preheating on the primary preheating product and generate the preheating product.

3. The coal slime dehydration process according to claim 2, characterized in that: The dehydration unit comprises: A hydrothermal reaction kettle (3), the inlet of which is connected to the outlet of the secondary preheater (2) to hydrothermally dehydrate the secondary preheating product and generate a dehydrated product; A filter press (4), the inlet of the filter press (4) being connected to the outlet of the hydrothermal reaction kettle (3) so as to filter and dehydrate the dehydrated product to generate the dry coal slime and the saturated water; Wherein, the outlet of the filter press (4) is connected to the inlet of the primary preheater (1); and / or the temperature of the saturated water is 60° C. to 120° C., and / or the moisture content of the dry coal slime is less than 30%.

4. The coal slime dehydration process according to claim 2, characterized in that: The gasification unit comprises: a gasifier (5), the inlet of the gasifier (5) being in communication with the outlet of the dehydration unit, so as to gasify 20% to 40% of the dry coal slime output from the dehydration unit to generate the gasification product; The outlet of the gasifier (5) is in communication with the feeding unit so as to transport the gasified slag into the feeding unit as a flotation agent so as to select the material from the original material stored in the feeding unit.

5. The coal slime dehydration process according to claim 4, characterized in that: The coal slime dehydration process also includes: A burner (6), the outlet end of the burner (6) being connected to the inlet end of the hydrothermal reaction kettle (3) in the dehydration unit so as to provide energy for the hydrothermal dehydration of the hydrothermal reaction kettle (3); The outlet end of the burner (6) is also connected to the gasifier (5) to provide energy for the gasifier (5) to gasify the dry coal slime; The outlet end of the gasifier (5) is also connected to the inlet end of the burner (6) so as to transport the gasification gas in the gasification product to the burner (6).

6. The coal slime dehydration process according to claim 5, characterized in that: The coal slime dehydration process also includes: A flue gas processor (7), wherein the inlet of the flue gas processor (7) is connected to the outlet of the burner (6), and the outlet of the flue gas processor (7) is connected to the secondary preheater (2) in the preheating unit to treat the exhaust gas generated by the burner (6), and convey the treated exhaust gas to the secondary preheater (2) to preheat the primary preheating product formed by preheating in the primary preheater (1) to form the preheating product.

7. The coal slime dehydration process according to claim 2, characterized in that: The coal slime dehydration process also includes: A wastewater pool (8), the inlet of which is connected to the outlet of the primary preheater (1) so as to collect wastewater generated by the primary preheater (1) after preheating the material.

8. The coal slime dehydration process according to claim 1, characterized in that: The feeding unit comprises: A material storage bin (9), wherein raw materials are stored in the material storage bin (9); a flotation cell (10), wherein the inlet of the flotation cell (10) is connected to the outlet of the storage bin (9), so as to float the raw material transported from the storage bin (9) under the action of the flotation agent to obtain the material; Wherein, the water content of the material is 80% to 95%.

9. The coal slime dehydration process according to claim 3, characterized in that: The hydrothermal temperature of the hydrothermal reaction kettle (3) is 120°C to 240°C.

10. The coal slime dehydration process according to claim 5, characterized in that: The temperature of the gas generated by the burner (6) is 200°C to 300°C.

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