Treatment device, system and method for sodium reduction and quality improvement of coal

Abstract

The invention relates to a treatment device, system and method for sodium reduction and quality improvement of coal, and the treatment device comprises a gas inlet pipeline which is used for conveying gasification waste gas generated by a coal chemical industry unit; the coal washing unit comprises a coal washing container, a coal supply container and a water storage container, the coal washing container is respectively connected with the gas inlet pipeline, the coal supply container and the water storage container, the coal supply container provides coal, the water storage container provides solvent water, and the coal washing container can receive second-metering gasified waste gas entering from the gas inlet pipeline; and the coal washing container can be used for washing coal by utilizing a mixture of gasified waste gas and water. According to the method, the acid mixture generated by carbon dioxide and water is used for cleaning the coal, the gasified waste gas generated by coal gasification is used as a continuous, sufficient and stable carbon dioxide source, and the coal chemical industry waste gas is used for washing the coal, so that the sodium-reducing and quality-improving effects of the coal can be improved, and the coal utilization is cleaner and more efficient; meanwhile, resource utilization of waste gas in the coal chemical industry is achieved, and multi-aspect environmental protection is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal processing, in particular to a coal sodium reduction and quality improvement processing device, system and method. BACKGROUND

[0002] Coal is a high-quality energy source for power generation and gasification, with characteristics of large reserves, low mining cost, high volatile matter, and low sulfur content. However, the unique coal-forming environment of most varieties of coal results in high alkali content in coal, with an average sodium content (calculated as NaO) of about 3.5% (ash basis), and in some areas, the sodium content (calculated as NaO) even reaches 10%, far exceeding the standard of 1-2% for sodium content in power coal. Therefore, coal sodium reduction and quality improvement has become an important way for efficient and clean utilization of high-alkali coal. The occurrence form of sodium in coal is mainly water-soluble sodium and organic sodium, with low content of insoluble sodium. Therefore, leaching high-sodium coal in an acidic environment can effectively remove water-soluble sodium and organic sodium in coal. In related technologies, CO2 is used to reduce sodium and improve the quality of coal based on laboratory level, which can only reduce sodium and improve the quality of a small amount of coal and cannot achieve the scale of actual production, and there is a lack of stable source of CO2 in actual process. SUMMARY

[0003] Therefore, it is necessary to provide a coal sodium reduction and quality improvement processing device, system and method which are convenient for industrial application, environmentally friendly and efficient.

[0004] In one aspect, a coal sodium reduction and quality improvement processing device is provided, which comprises:

[0005] An air inlet pipeline connected to an external coal chemical unit for conveying gasification waste gas generated by the coal chemical unit, the gasification waste gas containing a preset concentration of carbon dioxide; and

[0006] A coal washing unit comprising a coal washing container, a coal supply container and a water storage container, the coal washing container being connected to the air inlet pipeline, the coal supply container and the water storage container respectively, the coal supply container being configured to supply a first amount of coal to the coal washing container, the water storage container being configured to supply solvent water to the coal washing container, the coal washing container being capable of receiving a second amount of gasification waste gas from the air inlet pipeline, and the coal washing container being capable of using a mixture of gasification waste gas and water to wash the coal.

[0007] In one embodiment, the coal washing unit further comprises a wastewater container and a purifier, the wastewater container being connected to an outlet of the coal washing container, and the purifier being connected between the water storage container and the wastewater container.

[0008] In one aspect, a coal sodium reduction and quality improvement processing system is provided, which uses the above processing device.

[0009] In one of the embodiments, the processing system further comprises a coal chemical unit, the coal chemical unit comprises a coal storage bin, a crushing station for crushing the coal provided by the coal storage bin, and a coal gasifier for gasifying the crushed coal.

[0010] In one of the embodiments, the coal chemical unit further comprises a low-temperature methanol washing device, a methanol synthesizer, and a methanol container, the low-temperature methanol washing device is connected to the coal gasifier at the inlet and connected to the coal washing container at the outlet, the methanol synthesizer is used to make methanol, and the methanol container is connected to the methanol synthesizer and used to store methanol.

[0011] In one of the embodiments, the coal chemical unit further comprises a waste heat exchanger connected between the coal gasifier and the low-temperature methanol washing device, the waste heat exchanger is used to utilize the waste heat of the products of the coal gasifier, and the gasification exhaust gas in the products is cooled by the waste heat exchanger and then enters the low-temperature methanol washing device.

[0012] In one of the embodiments, the coal chemical unit further comprises a waste heat exchanger connected to the coal gasifier, the waste heat exchanger is used to utilize the waste heat of the products of the coal gasifier, the coal washing unit is provided with a dryer, the dryer is arranged at the outlet of the coal washing container and used to dry the washed coal, the waste heat exchanger is connected to the dryer, and the waste heat exchanger can supply heat to the dryer.

[0013] In one of the embodiments, the coal chemical unit further comprises a waste heat exchanger connected to the coal gasifier, the waste heat exchanger is used to utilize the waste heat of the products of the coal gasifier, the waste heat exchanger is connected to the coal washing container, and the waste heat exchanger can supply heat to the coal washing container.

[0014] In one aspect, a processing method for sodium reduction and quality improvement of coal is provided, the processing method comprises the following steps:

[0015] Obtaining gasification exhaust gas generated by coal gasification, the gasification exhaust gas comprises carbon dioxide at a preset concentration;

[0016] Providing a first amount of coal, a second amount of gasification exhaust gas, and solvent water;

[0017] Cleaning the coal by using a mixture of the gasification exhaust gas and the water.

[0018] In one of the embodiments, the processing method further comprises:

[0019] Obtaining waste heat generated by coal gasification;

[0020] Using the waste heat to heat the coal cleaning process, or using the waste heat to dry the cleaned coal.

[0021] The processing device uses the acidic mixture generated by carbon dioxide and water to clean coal, uses the gasification waste gas generated by coal gasification as a continuous, sufficient and stable carbon dioxide source, and makes the sodium reduction effect of coal better in a weak acid environment, thereby improving the sodium reduction and upgrading effect of coal, making the utilization of coal cleaner and more efficient, and realizing the resource utilization of coal chemical industry waste gas in multiple aspects. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic diagram of a coal sodium reduction and upgrading processing system and processing device according to an embodiment of the present application.

[0023] Figure 2 A flowchart of a coal sodium reduction and upgrading processing method according to an embodiment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 20 - processing device; 100 - processing system; 1 - coal chemical unit; 2 - coal washing unit;

[0026] 11 - coal storage bin; 12 - crushing station; 13 - coal gasification furnace; 14 - waste heat exchanger; 15 - low-temperature methanol washing device; 16 - methanol synthesizer; 17 - methanol container;

[0027] 21 - coal washing container; 22 - dryer; 23 - high-quality coal container; 24 - wastewater container; 25 - purifier; 26 - water storage container. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted in a broad sense. For example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, if there is a description such as "on" or "under" of the first feature to the second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0033] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0034] As a weak acid, carbonic acid does not cause pollution in the utilization process, and the effect of using CO2 water washing on the removal of sodium in coal is better than that of conventional water washing. In the related art, the use of CO2 to reduce sodium and upgrade coal is based on the laboratory level, and only a small amount of coal is used to reduce sodium and upgrade, which cannot achieve the scale of actual production, and there is a lack of stable source of CO2 in the actual process. The occurrence form of sodium in coal is mainly water-soluble sodium and organic sodium, so the water-soluble sodium and organic sodium in coal can be more effectively removed in the acid environment. It is found through research that the waste gas of low-temperature methanol washing in the coal chemical industry process contains a large amount of CO2. Modern coal chemical industry is an effective way to improve the clean and efficient utilization level of coal, and realize the transformation of coal from single fuel to fuel and raw material. However, a large amount of waste gas containing CO2 is generated in the low-temperature methanol washing process of coal chemical industry, and if the waste gas is directly discharged, it will cause environmental pollution and resource waste.

[0035] In the application process of coal chemical industry, the emission amount of low-temperature methanol washing waste gas is large and continuous, and the gas fluctuation is small, wherein the volume fraction content of CO2 is usually 78-90%, and if the waste gas is directly discharged, it will not only pollute the environment, but also cause resource waste. Based on this, the embodiment considers the characteristics of high sodium content in coal, selects coupling with coal chemical industry, aims to realize the two purposes of CO2 water washing coal sodium reduction and upgrading and resource utilization of coal chemical waste gas to reduce carbon emission, and provides a coal sodium reduction and upgrading treatment device, system and method which are convenient for industrial application, environmentally friendly and efficient.

[0036] Referring to Figure 1 , Figure 1 A coal sodium reduction and upgrading treatment device 20 provided by an embodiment of the application is shown, and the treatment device 20 comprises a gas inlet pipeline and a coal washing unit.

[0037] The gas inlet pipeline is connected with an external coal chemical unit and is used to transport gasification waste gas generated by the coal chemical unit, and the gasification waste gas comprises a preset concentration of carbon dioxide; and

[0038] The coal washing unit 2 comprises a coal washing container 21, a coal supply container and a water storage container 26, the coal washing container 21 is connected with the gas inlet pipeline, the coal supply container and the water storage container 26 respectively, the coal supply container is used to provide a first amount of coal to the coal washing container 21, the water storage container 26 is used to provide solvent water to the coal washing container 21, the coal washing container 21 can accept a second amount of gasification waste gas entering from the gas inlet pipeline, and the coal washing container 21 can use the mixture of gasification waste gas and water to wash the coal.

[0039] The processing device 20 uses the acidic mixture generated by carbon dioxide and water to clean the coal, uses the gasification waste gas generated by coal gasification as a continuous, sufficient and stable source of carbon dioxide, and makes the sodium reduction effect of the coal better in a weak acid environment. The use of coal chemical industry waste gas to wash coal improves the effect of sodium reduction and quality improvement of coal, makes the utilization of coal cleaner and more efficient, and also realizes the resource utilization of coal chemical industry waste gas, achieving environmental protection in multiple aspects.

[0040] The coal washing container 21 is provided with at least three inlets, and the at least three inlets are respectively connected with the gas inlet pipeline, the coal supply container and the water storage container 26. The coal washing container 21 is provided with at least two outlets, one of which is used for discharging waste water or waste gas, and the other of which is used for extracting the cleaned coal.

[0041] The solvent water is a liquid with high solubility to carbon dioxide, and can be selected from pure water, pure water or recycled water. The first metering and the second metering are calculated according to the preset concentration of carbon dioxide and the required acidity (ph value) of cleaning, wherein the required acidity of cleaning can be determined according to the sodium content of each batch of coal. Specifically, due to the unique coal-forming environment of some types of coal, the content of alkali metal in the coal is high, and the average content of sodium (calculated as NaO) is about 3.5% (ash basis), and the sodium content (calculated as NaO) in some areas is even as high as 10%. As a preferred embodiment, the coal is quasi-eastern coal.

[0042] In one embodiment, the coal washing unit 2 further comprises a waste water container 24 and a purifier 25, the waste water container 24 is connected to the outlet of the coal washing container 21, and the purifier 25 is connected between the water storage container 26 and the waste water container 24.

[0043] Specifically, at least one outlet of the coal washing container 21 is connected to the inlet of the waste water container 24 through a pipeline, the outlet of the waste water container 24 is connected to the inlet of the purifier 25 through a pipeline, and the outlet of the purifier 25 is connected to the inlet of the water storage container 26 through a pipeline. The waste water participating in the cleaning of the coal in the coal washing container 21 is first stored in the waste water container 24, part of the waste water is purified by the purifier 25 to meet the standard of the solvent water, and then enters the water storage container 26 as recycled water to participate in the cleaning of the coal again. From the coal washing container 21, the waste water container 24, the purifier 25, the water storage container 26 and their pipelines are sequentially passed through, and then return to the coal washing container 21, which together constitute a recycling loop. Preferably, the purifier 25 is a reverse osmosis purifier 25.

[0044] In one embodiment, the coal washing unit 2 further comprises a high-quality coal container 23, the high-quality coal container 23 is used for storing the cleaned coal, and a dryer 22 is arranged between the coal washing container 21 and the high-quality coal container 23, and the outlet of the dryer 22 is connected to the inlet of the high-quality coal container 23.

[0045] The application considers the problem of treating coal washing wastewater, and purifies the coal washing wastewater by introducing reverse osmosis purification technology. The water purified by reverse osmosis purification is returned to the coal washing container 21 to continue coal washing, thereby reducing the cost of water in the coal washing process and avoiding waste of wastewater resources.

[0046] As shown in Figure 1 The coal sodium reduction and quality improvement treatment device 20 provided by the embodiment of the application is used in a coal sodium reduction and quality improvement treatment system 100. The treatment system 100 includes a structure for manufacturing coal gasification products and providing gasification waste gas, so that the coal washing unit 2 can be combined with the coal gasification industry to form a complete treatment system 100, or the coal washing unit 2 can be integrated into an existing coal gasification industrial system to form a complete treatment system 100.

[0047] In one embodiment, the treatment system 100 further includes a coal chemical unit 1, the coal chemical unit 1 includes a coal storage bin 11, a crushing station 12 and a coal gasification furnace 13, the crushing station 12 is used for crushing coal provided by the coal storage bin 11, and the coal gasification furnace 13 is used for gasifying the crushed coal.

[0048] Specifically, the coal used by the coal chemical unit 1 and the coal stored in the coal storage bin 11 can be Zhundong coal or other coal types other than Zhundong coal. Further, when the coal used by the coal chemical unit 1 and the coal stored in the coal storage bin 11 is Zhundong coal, it can be Zhundong coal before sodium reduction and quality improvement or Zhundong coal after sodium reduction and quality improvement. As a preferred embodiment, the outlet of the coal storage bin 11 is connected to the two inlets of the crushing station 12 and the coal washing container 21, and the coal storage bin 11 is the supply container, providing two use ways for Zhundong coal. Different use ways can flexibly adjust the ratio of coal for chemical industry and coal for washing according to market demand, produce coal products more suitable for the current market; different coal products can be promoted through multiple channels to increase sales opportunities and sales; using different use ways can reduce the risk of a company marketing in a single channel; having multiple high-quality coal products through different use ways can greatly improve customer satisfaction and optimize customer experience.

[0049] In one embodiment, the coal chemical unit 1 further includes a low-temperature methanol washing device 15, a methanol synthesizer 16 and a methanol container 17, the inlet of the low-temperature methanol washing device 15 is connected to the coal gasification furnace 13, and the outlet is connected to the inlet of the coal washing container 21, the methanol synthesizer 16 is used for making methanol, and the methanol container 17 is connected to the methanol synthesizer 16 and is used for storing methanol.

[0050] In the chemical production with coal as raw material, the crude synthesis gas contains a large amount of excess CO2, a small amount of H2S, COS and other acid gases, which are not conducive to production. The sulfides in them can cause catalyst poisoning in downstream production and must be removed and recovered. The physical absorption method is more economical and mature, and is widely used in industrial production, with Rectisol and NHD as its representatives. The low-temperature methanol washing process in the low-temperature methanol washing device 15 uses cold methanol as the absorption solvent, takes advantage of the excellent characteristics of methanol that has a very large solubility for acid gases (CO2, H2S, COS, etc.) at low temperatures, removes the acid gases in the raw material gas, and in the subsequent methanol regeneration process of the methanol synthesizer 16, CO2 and H2S are respectively released for recycling. CO2 is directly introduced into the coal washing container 21, thereby obtaining pure methanol products and storing them in the methanol container 17.

[0051] The above-mentioned coupling of the coal chemical unit 1 and the coal washing unit 2, the low-temperature methanol washing device of the coal chemical unit 1 and the methanol synthesizer 16 can produce a large amount of CO2, and the coal can be washed with a large amount of CO2 waste gas. Compared with pure water washing, the coal immersed in the carbonic acid environment can more effectively remove water-soluble sodium and organic sodium in the coal. Therefore, using coal chemical waste gas to wash coal can improve the effect of coal sodium reduction and upgrading, making the coal utilization more clean and efficient, and the waste gas in the coal chemical industry production process is also resourceized. By adjusting the coupling degree between the two units, the performance and stability of the overall system can be improved, and the reliability and safety can be improved.

[0052] In one embodiment, the coal chemical unit 1 further comprises a waste heat exchanger 14 connected between the coal gasifier 13 and the low-temperature methanol washing device 15, and the waste heat exchanger 14 is used to utilize the waste heat of the product of the coal gasifier 13. The gasification waste gas in the product is cooled by the waste heat exchanger 14 and then enters the low-temperature methanol washing device 15.

[0053] The waste heat in coal gasification mainly includes the waste heat of gasified coal, the waste heat of gasification waste gas, and the waste heat of waste water, etc. The waste heat exchanger 14 can be a device for heating water or gas with waste heat. According to the temperature range of the waste heat, a suitable heating object is selected, and the heated water or gas provides heat for the coal washing container 21 or the dryer. The waste heat exchanger 14 is arranged upstream of the low-temperature methanol washing device 15. The gasified coal and the gasification waste gas in the product are first introduced from the coal gasifier 13 and then pass through the waste heat exchanger 14 for waste heat utilization. After being cooled, they are introduced into the low-temperature methanol washing device 15 for CO2 capture, thereby achieving full utilization of waste heat.

[0054] In one of the embodiments, the coal chemical unit further comprises a waste heat exchanger 14 connected to the coal gasifier 13, the waste heat exchanger 14 is used to utilize the waste heat of the product of the coal gasifier 13, the coal washing unit 2 is provided with a dryer, the dryer is arranged at the outlet of the coal washing container 21 and is used to dry the cleaned coal, the waste heat exchanger 14 is connected to the dryer, and the waste heat exchanger 14 can supply heat to the dryer. In one of the embodiments, the waste heat exchanger 14 is connected to the coal washing container 21, and the waste heat exchanger 14 can supply heat to the coal washing container 21.

[0055] The present application reasonably utilizes the heat energy generated by the coal chemical unit 1, utilizes the excess heat energy generated in the coal gasification process, supplies heat to the coal washing container 21 and the dryer through the waste heat exchanger, and finally achieves the dual purposes of increasing the sodium reduction effect and drying the coal by increasing the coal washing temperature, so that the heat energy is reasonably utilized without waste.

[0056] Referring to Figure 2 , Figure 2 A coal sodium reduction and upgrading treatment method in one of the embodiments of the present application is shown, the treatment method comprises the steps of:

[0057] S1, obtaining the gasification waste gas generated in the coal gasification, the gasification waste gas comprises carbon dioxide of a preset concentration;

[0058] S2, providing a first amount of coal, a second amount of gasification waste gas, and solvent water;

[0059] S3, cleaning the coal by using the mixture of the gasification waste gas and water.

[0060] In one of the embodiments, the treatment method further comprises:

[0061] S4, a waste heat utilization step, specifically comprising:

[0062] S41, obtaining the waste heat generated in the coal gasification;

[0063] S42, heating the coal cleaning process by using the waste heat, or drying the cleaned coal by using the waste heat.

[0064] In one of the embodiments, between steps S2 and S3, the treatment method further comprises:

[0065] S5, a step of obtaining carbon dioxide in the gasification waste gas, specifically comprising:

[0066] S51, obtaining the gasification waste gas after cooling after step S41;

[0067] S52, capturing the carbon dioxide in the gasification waste gas by using low-temperature methanol;

[0068] S53, separating the carbon dioxide and obtaining methanol.

[0069] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered to be within the scope of the present disclosure.

[0070] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A coal sodium reduction and upgrading treatment device, characterized in that, The processing device includes: An intake pipe, connected to an external coal chemical unit, is used to transport the gasification waste gas generated by the coal chemical unit, the gasification waste gas containing a preset concentration of carbon dioxide; and A coal washing unit includes a coal washing container, a coal supply container, and a water storage container. The coal washing container is connected to the air inlet pipe, the coal supply container, and the water storage container. The coal supply container is used to supply a first meter of coal to the coal washing container. The water storage container is used to supply solvent water to the coal washing container. The coal washing container can accept a second meter of gasification waste gas entering from the air inlet pipe, and the coal washing container can use a mixture of gasification waste gas and water to clean the coal.

2. The coal sodium reduction and upgrading treatment device according to claim 1, characterized in that, The coal washing unit also includes a wastewater container and a purifier. The wastewater container is connected to the outlet of the coal washing container, and the purifier is connected between the water storage container and the wastewater container.

3. A coal sodium reduction and upgrading system, characterized in that, The processing apparatus described in claim 1 or 2 is used.

4. The coal sodium reduction and upgrading system according to claim 3, characterized in that, The processing system also includes a coal chemical unit, which includes a coal storage silo, a crushing station, and a coal gasification furnace. The crushing station is used to crush the coal provided by the coal storage silo, and the coal gasification furnace is used to gasify the crushed coal.

5. The coal sodium reduction and upgrading system according to claim 4, characterized in that, The coal chemical unit also includes a low-temperature methanol washer, a methanol synthesizer, and a methanol container. The inlet of the low-temperature methanol washer is connected to the coal gasification furnace, and the outlet is connected to the inlet of the coal washing container. The methanol synthesizer is used to produce methanol, and the methanol container is connected to the methanol synthesizer and used to store methanol.

6. The coal sodium reduction and upgrading system according to claim 5, characterized in that, The coal chemical unit also includes a waste heat exchanger connected between the coal gasifier and the low-temperature methanol scrubber. The waste heat exchanger is used to utilize the waste heat of the products from the coal gasifier. The gasification waste gas in the products is cooled by the waste heat exchanger and then enters the low-temperature methanol scrubber.

7. The coal sodium reduction and upgrading system according to claim 4, characterized in that, The coal chemical unit also includes a waste heat exchanger connected to the coal gasification furnace. The waste heat exchanger is used to utilize the waste heat of the products of the coal gasification furnace. The coal washing unit is equipped with a dryer. The dryer is located at the outlet of the coal washing container and is used to dry the washed coal. The waste heat exchanger is connected to the dryer and can supply heat to the dryer.

8. The coal sodium reduction and upgrading system according to claim 4, characterized in that, The coal chemical unit also includes a waste heat exchanger connected to the coal gasification furnace. The waste heat exchanger is used to utilize the waste heat of the products of the coal gasification furnace. The waste heat exchanger is connected to the coal washing container and can supply heat to the coal washing container.

9. A method for reducing sodium content and improving the quality of coal, characterized in that, The processing method includes the following steps: Obtain gasification waste gas generated from coal gasification, wherein the gasification waste gas contains carbon dioxide at a preset concentration; It provides a first meter of coal, a second meter of gasification waste gas, and solvent water; Coal is cleaned using a mixture of gasification waste gas and water.

10. The coal sodium reduction and upgrading method according to claim 9, wherein the method further comprises: To extract waste heat generated during coal gasification; The waste heat is used to heat the coal washing process, or to dry the washed coal.

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