A coal gasification fine slag multi-mixed combustion conversion boiler system and working method

Abstract

The present invention provides a coal gasification fine slag multi-mixed combustion conversion boiler system and a working method, which relate to the field of environmental protection technology. In view of the current problem that gasification fine slag, a non-combustible solid waste, is difficult to treat and the gasification fine slag mixing ratio and operating efficiency are low, a system suitable for gasification fine slag treatment is adopted, and a combustible waste gas source is utilized to participate in combustion, and the waste gas is used as fuel to participate in combustion, thereby realizing energy recycling and reducing dependence on additional fuel. The burner of the first combustion chamber and the second combustion chamber are both connected to the combustible waste gas source, so that the combustible waste gas can be fully burned in the system, providing energy for the system operation and reducing operating costs. The feeding component can supply gasification fine slag to the second combustion chamber, and a boiling material for carrying the gasification fine slag is provided on the air distribution plate, which helps to improve the combustion efficiency of the gasification fine slag. The mixed combustion furnace realizes multi-mixed combustion, thereby meeting the coal chemical enterprise's demand for gasification fine slag treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection, and in particular to a coal gasification fine slag multi-mixed combustion conversion boiler system and a working method. Background Art

[0002] Coal chemical industries (fertilizer, methanol, coal-to-liquids, olefins) generate large quantities of coal gasification slag (also known as filter cake or coal slime) during their production processes. This slag is extremely fine, with 75% being larger than 200 mesh. It has no volatile matter, exhibits semi-coke properties, and is difficult to burn. Its dry carbon content is 18-22%, its water content is 45-52%, and its lower calorific value is 800-900 kcal / kg. The daily production volume reaches 300-500 tons. Conventional methods are unable to properly combust it, or the combustion rate is less than 50%. Currently, a fluidized bed co-combustion furnace is commonly used to treat industrial waste. This furnace utilizes the principle of fluidized combustion of coal (slag) and a mixed combustion method using gasification airflow. Leveraging some circulating fluidized bed technology, it employs a membrane-based method for waste heat recovery from the gasification airflow. The furnace fluidizes and combusts the gasification slag and fine dust from the gasification dust collector generated during the fixed-bed gasification process. The furnace then ignites the airflow, generating high-temperature flue gas and achieving heat recovery. However, it has high requirements on the combustion value of industrial waste, and it is difficult to process the low calorific value gasification fine slag. Although the gasification fine slag can reduce the moisture content through dehydration treatment, it can only be used for secondary combustion in pulverized coal boilers and is difficult to treat alone.

[0003] A Chinese patent (publication number CN 111121059 B, publication date 20200508) discloses an energy-saving and environmentally friendly treatment system for the mixed combustion of industrial waste, the three wastes, and the incineration. Through the cooperation of a circulating fluidized bed boiler and a secondary combustion chamber, a two-stage incineration is adopted. The furnace of the circulating fluidized bed mainly incinerates solid waste and waste liquid, and the secondary combustion chamber mainly incinerates waste gas, so that waste gas and waste residue with different calorific values ​​enter the system successively, and finally are mixed and burned in the secondary combustion chamber to form a combined combustion form. It uses diesel or natural gas as fuel to supply the entire system operation, which requires additional fuel supply, increases operating costs and dependence on external energy. Moreover, the waste residue in the three wastes it targets is conventional solid waste, and it is difficult to carry out targeted treatment for solid waste such as gasified fine slag that is not easy to burn. Due to its own characteristics, the gasified fine slag has a low mixing ratio and low overall operation efficiency, which makes it difficult to meet the treatment needs of coal chemical enterprises for gasified fine slag. Summary of the Invention

[0004] The purpose of the present invention is to address the defects of the existing technology and provide a coal gasification fine slag multi-mixed combustion conversion boiler system and working method. A system suitable for the treatment of gasification fine slag is adopted, and a combustible waste gas source is utilized to participate in the combustion, and the waste gas is used as fuel to participate in the combustion, thereby realizing energy recovery and reducing dependence on additional fuel. The burner of the first combustion chamber and the second combustion chamber are both connected to the combustible waste gas source, so that the combustible waste gas can be fully burned in the system, providing energy for the operation of the system and reducing operating costs. The feeding component can supply gasification fine slag to the second combustion chamber, and a boiling material for carrying the gasification fine slag is provided on the air distribution plate, which helps to improve the combustion efficiency of the gasification fine slag. The mixed combustion furnace realizes multi-mixed combustion, thereby meeting the coal chemical enterprise's treatment needs for gasification fine slag.

[0005] The first object of the present invention is to provide a coal gasification fine slag multi-mixed combustion conversion boiler system, which adopts the following scheme:

[0006] include:

[0007] The mixed combustion furnace has a combustion chamber 1 formed below the furnace and a combustion chamber 2 formed inside the furnace. An air distribution plate with an air hood is provided between the combustion chamber 1 and the combustion chamber 2. The air hood of the air distribution plate is provided with a boiling material for carrying the gasified fine slag. The combustion chamber 1 is used to fill with hot air or to generate hot air from combustion and supply it to the combustion chamber 2, so that the combustion chamber 2 forms an environment for the combustion of the gasified fine slag. The air distribution plate and the air hood are made of high-temperature resistant materials.

[0008] A feeding assembly is provided with an output end and is connected to the second combustion chamber to supply gasified fine slag to the second combustion chamber;

[0009] The heat exchange component includes a boiler, the inlet end of the boiler is connected to the top of the furnace and forms a height difference with the output end of the feeding component, and the outlet end of the boiler is connected to the post-processing component.

[0010] Furthermore, the first combustion chamber is equipped with a burner, which is connected to a primary air blower and a combustible gas source through pipelines, and the second combustion chamber is connected to a secondary air blower and a combustible gas source through pipelines.

[0011] Furthermore, the combustible gas source is an exhaust gas source and / or a combustible gas source, and the combustible gas source is connected to the second combustion chamber through a pipeline, which is a combustible gas injection port. The axis of the combustible gas injection port is arranged tangentially compared to the inner wall of the furnace where it is located to output a tangential combustible gas flow.

[0012] Furthermore, vertically along the furnace, the output end of the feeding assembly is located between the combustible waste gas injection port and the boiling material.

[0013] Furthermore, a flue gas outlet is provided on the side of the furnace top, and the elevation between the flue gas outlet and the output end of the feeding assembly is configured to allow the gasified fine slag to be fully burned in the furnace.

[0014] Furthermore, an exhaust gas fan is installed on the pipeline connecting the first combustion chamber to the combustible exhaust gas source, and the boiler outlet is connected to the post-processing component through a waste heat utilization mechanism. The primary fan is connected to the pipeline of the first combustion chamber, and the secondary fan is connected to the pipeline of the second combustion chamber, which respectively cooperate with the waste heat utilization mechanism. The waste heat from the waste heat utilization mechanism is input into the mixed combustion furnace.

[0015] Furthermore, the feeding assembly includes a feeder, a loader and a conveyor that are connected in sequence to transport the gasified fine slag. The conveyor passes through the side wall of the co-burning furnace and is connected to the second combustion chamber. The connection position forms the output end of the feeding assembly.

[0016] Furthermore, the output end includes a plurality of output ports arranged at intervals and respectively connected to the second combustion chamber. The second combustion chamber is connected to the combustion-supporting air through the combustion-supporting air port. There are multiple combustion-supporting air ports and they are distributed at intervals.

[0017] Furthermore, the boiler is provided with heat exchange tubes, the waste heat utilization mechanism includes an economizer and a heat exchanger, and the pipelines of the primary fan and the secondary fan connected to the co-firing furnace are preheated in conjunction with the heat exchanger.

[0018] Furthermore, the first combustion chamber is filled with hot air, and the hot air passes through the air distribution plate into the second combustion chamber to heat the boiling material and heat the second combustion chamber, so that the gasified fine slag is dried and exploded in the second combustion chamber.

[0019] A second object of the present invention is to provide an operating method of the coal gasification fine slag multi-mixed combustion reforming boiler system as described in the first object, comprising:

[0020] Hot air is charged into the first combustion chamber or combustible gas is burned in the first combustion chamber to generate hot air, and the hot air passes through the air distribution plate and enters the second combustion chamber to heat the boiling material and the second combustion chamber;

[0021] The feeding assembly transports the gasified fine slag to the second combustion chamber and drops it onto the boiling material; the gasified fine slag is dried and boiled in a high-temperature environment, and the gasified fine slag is fully burned in the high-temperature area of ​​the second combustion chamber, and the temperature in the second combustion chamber is maintained;

[0022] The flue gas generated in the second combustion chamber is transported to the boiler to recover the heat contained in the flue gas.

[0023] Furthermore, the height of the second combustion chamber is set to meet the requirement of sufficient combustion time of gasified fine slag in the second combustion chamber. The hot air in the first combustion chamber is input into the second combustion chamber through the air distribution plate to provide a high temperature environment for the second combustible chamber.

[0024] Compared with the prior art, the present invention has the following advantages and positive effects:

[0025] In response to the current problems that gasified fine slag, a non-combustible solid waste, is difficult to treat and has a low co-combustion ratio and low operating efficiency, a system suitable for the treatment of gasified fine slag is adopted. The combustible waste gas source is used to participate in the combustion, and the waste gas is used as fuel to participate in the combustion, thereby realizing energy recovery and reducing dependence on additional fuel. The burner of the first combustion chamber and the second combustion chamber are both connected to the combustible waste gas source, so that the combustible waste gas can be fully burned in the system, providing energy for the system operation and reducing operating costs. The feeding component can supply the gasified fine slag to the second combustion chamber, and a boiling material for carrying the gasified fine slag is provided on the air distribution plate, which helps to improve the combustion efficiency of the gasified fine slag. The co-burning furnace realizes multi-mixed combustion, thereby meeting the coal chemical enterprise's treatment needs for gasified fine slag.

[0026] Make full use of the internal combustible waste gas energy to drive the combustion process, reduce the cost of external fuel procurement, recover waste heat to preheat air and produce steam, improve the overall energy efficiency of the system, reduce energy consumption costs, optimize the entire energy utilization process, enhance the company's economic benefits and competitiveness, and transform waste into energy assets.

[0027] The first combustion chamber can be filled with hot air or burned to form hot air which is then supplied to the second combustion chamber to heat the boiling material and establish a high temperature environment in the second combustion chamber. The hot air can be obtained by heat exchange with external high temperature flue gas, or by heating the air with other combustible gases (coal gas, natural gas); or the process waste gas can be used as combustible waste gas to be filled into the first combustion chamber for combustion to generate hot air, thereby improving the flexibility of the mixed combustion furnace.

[0028] The primary and secondary fans are connected to the pipeline in conjunction with the waste heat utilization mechanism for preheating to reduce energy consumption; multiple feeding components work together to transport gasified fine slag to ensure stable feeding; the reasonable layout of the first and second combustion chambers and the design of multiple air inlets and multiple output ports ensure uniform and stable combustion, overcoming the defects of high operating energy consumption and poor stability.

[0029] The tangential arrangement of the combustible waste gas injection port allows the combustible waste gas to be ejected at high speed along the tangential direction of the inner wall of the furnace when entering the second combustion chamber, thereby forming a rotating airflow in the second combustion chamber. The rotating airflow can produce a stirring effect and continuously stir the inside of the furnace. In the second combustion chamber, the gasified fine slag is transported by the feeding assembly to the boiling material for combustion. The tangential combustible waste gas flow can effectively drive the gasified fine slag particles, so that they are fully mixed with the combustion-supporting air and other combustible waste gases transported by the secondary fan. Since the gasified fine slag itself is not easy to burn, the good mixing effect can ensure that it is fully in contact with oxygen, providing favorable conditions for the combustion reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute a part of the present invention, 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 improper limitations on the present invention.

[0031] Figure 1 Schematic diagram of a co-combustion furnace and boiler of a coal gasification fine slag multi-combustion conversion boiler system in one or more embodiments of the present invention.

[0032] Figure 2 Schematic diagram of post-processing components of a coal gasification fine slag multi-mixed combustion conversion boiler system in one or more embodiments of the present invention.

[0033] Among them, 1. Mixed combustion furnace; 2. Feeding assembly; 3. Combustion chamber 1; 4. Combustion chamber 2; 5. Boiling material; 6. Exhaust gas fan; 7. Primary fan; 8. Secondary fan; 9. Waste heat utilization mechanism; 10. Boiler; 11. Furnace; 12. Combustible exhaust gas source; 13. Combustible exhaust gas injection port; 14. Combustion-supporting air port; 15. Burner; 16. Output end; 17. Bag filter; 18. Draft fan; 19. Chimney; 20. Water source. DETAILED DESCRIPTION

[0034] Example 1

[0035] In a typical embodiment of the present invention, Figure 1-Figure 2 As shown, a coal gasification fine slag multi-mixed combustion conversion boiler system is provided.

[0036] The gasification fine slag (coal slime) produced by coal chemical enterprises has fine particle size (75% of which is above 200 mesh), no volatile matter, semi-coke characteristics, high water content (45-52%) and low low calorific value (800-900kcal / kg). The daily output is 300-500 tons. Conventional combustion methods are difficult to make it burn effectively, and the combustion rate is often less than 50%, resulting in a large amount of resource waste and environmental pollution. In addition, although chemical enterprises have a large amount of waste gas with calorific value (low calorific value 2000-3500kcal / m 3 , gas volume 3000-5000Nm 3 / h), but lacks an effective integration and utilization mechanism, and has not fully tapped its synergistic efficiency potential in the gasification fine slag combustion process. At the same time, previous systems have limited utilization of combustion waste heat, resulting in energy waste, increased production costs and environmental pressure. Based on this, the present embodiment provides a coal gasification fine slag multi-mixed combustion conversion boiler system, which adopts a system suitable for gasification fine slag treatment, utilizes a combustible waste gas source 12 to participate in combustion, and uses the waste gas as fuel to participate in combustion, thereby realizing energy recycling and reducing dependence on additional fuel. The burner 15 of the first combustion chamber 3 and the second combustion chamber 4 are both connected to the combustible waste gas source 12, so that the combustible waste gas can be fully burned in the system, providing energy for system operation and reducing operating costs.

[0037] In addition, in this embodiment, the feeding assembly 2 supplies gasified fine slag to the second combustion chamber 4. A boiling material 5 is provided on the air distribution plate to carry the gasified fine slag, which helps improve the combustion efficiency of the gasified fine slag. The co-firing furnace 1 achieves multi-mixed combustion, thus meeting the gasified fine slag processing needs of coal chemical enterprises. A hood is installed on the air distribution plate to carry the gasified fine slag. Both the air distribution plate and the hood are made of high-temperature resistant materials.

[0038] It should be pointed out that in other optional embodiments, the combustion chamber 3 can also be directly filled with hot air. The hot air can be obtained by heat exchange with external high-temperature flue gas, or by heating air with other combustible gases (coal gas, natural gas). Unlike burning combustible waste gas, the solution of directly filling with hot air is suitable for scenarios where it is inconvenient to provide combustible waste gas in the factory area, or the amount of combustible waste gas provided is obviously unable to meet the combustion requirements of the co-combustion furnace 1.

[0039] Specifically, when some processes do not burn combustible gas in the bottom combustion chamber 3 to provide hot air, and instead use 400-950°C high-temperature air as the hot air, the operating requirements of the co-firing furnace 1 can also be met. The hot air can be obtained by exchanging heat between high-temperature flue gas and air before entering the boiler inlet (using a heater to heat the air), or by burning process exhaust gas to heat the air separately, or by burning combustible gas (coal gas, natural gas, etc.) to heat the air.

[0040] like Figure 1 and Figure 2 As shown, the coal gasification fine slag multi-mixed combustion conversion boiler system includes a mixed combustion furnace 1, a feeding component 2, a heat exchange component and a post-processing component. In this embodiment, the combustion chamber 3 is installed with a burner 15 to generate hot air and supply it to the second combustion chamber 4 for explanation, wherein the combustible gas source is an exhaust gas source and / or a combustible gas source, and the exhaust gas source is a combustible exhaust gas source 12, which can supply combustible gases such as coal gas and natural gas to the combustion chamber 3. The process of the combustible gas source supplying combustible gas to the combustion chamber 3 to form hot air is similar to the process of the combustible exhaust gas source 12 supplying combustible exhaust gas to the combustion chamber 3 to form hot air. In this embodiment, the combustible exhaust gas source 12 supplying combustible exhaust gas to the combustion chamber 3 is explained in detail.

[0041] A furnace 11 is provided in the mixed combustion furnace 1, and a combustion chamber 13 is formed below the furnace 11, and a combustion chamber 2 is formed in the furnace 11. An air distribution plate is provided between the combustion chamber 13 and the combustion chamber 2, 4, and a boiling material 5 for carrying gasified fine slag is provided on the air distribution plate. The flue gas generated by the combustion in the combustion chamber 13 can be input into the combustion chamber 2 4 to create a high-temperature environment for the combustion chamber 2 4. The burner 15 of the combustion chamber 13 is respectively connected to the primary fan 7 and the combustible waste gas source 12 through pipelines, so that the combustible waste gas input to the burner 15 can burn and release heat in the combustion chamber 13; the combustion chamber 2 is respectively connected to the secondary fan 8 and the combustible waste gas source 12 through pipelines, so that the combustible waste gas input to the burner 15 can burn and release heat in the combustion chamber 3; the combustion chamber 2 is respectively connected to the secondary fan 8 and the combustible waste gas source 12 through pipelines, so that the combustible waste gas input to the combustion chamber 4 can burn and release heat in the combustion chamber 2.

[0042] The combustible waste gas in this embodiment comes from multiple production links. For example, synthesis vent air, flash gas desorption gas, etc. may be the source of combustible waste gas. These waste gases usually contain some combustible components, such as carbon monoxide, hydrogen, methane, etc., and their low calorific value is generally 2000-3500kcal / m 3 The general enterprise waste gas volume is 3000-5000Nm 3 / h, which is sufficient to support the co-combustion process of gasified fine slag. In this system, it participates in the combustion reaction as an important energy source, realizing comprehensive energy utilization and energy conservation and emission reduction.

[0043] For the layout of the combustion chamber, such as Figure 1 As shown, the first combustion chamber 3 is constructed below the furnace 11, and the second combustion chamber 4 is located within the furnace 11, separated by an air distribution plate. The first combustion chamber 3 utilizes a burner 15 in conjunction with a primary fan 7 and a combustible waste gas source 12 to provide energy for initiating and maintaining the combustion process. The high-temperature flue gas (800-1000°C) after combustion is systematically introduced into the second combustion chamber 4 through the air chamber, air distribution plate, and air hood, preheating the environment in the second combustion chamber 4 and forming a cascaded heat utilization structure.

[0044] The air distribution plate carries the boiling material 5, providing stable support and good air permeability for the gasified fine slag, ensuring that the gasified fine slag is in a boiling combustion state in the second combustion chamber 4, increasing the contact area with oxygen, strengthening the combustion reaction kinetics conditions, and improving combustion efficiency.

[0045] Specifically, the boiling material 5 can support the gasification of fine slag, promote uniform distribution of airflow, and enhance combustion reaction kinetics.

[0046] The boiling material 5 on the air distribution plate provides a stable support foundation for the gasified fine slag. Due to the characteristics of the gasified fine slag itself, such as fine particle size and high water content, if there is no suitable support structure, it is easy to accumulate or distribute unevenly in the combustion chamber; the boiling material 5 ensures that the gasified fine slag can be reasonably distributed in the second combustion chamber 4, so that it is in a state conducive to combustion, avoiding combustion obstruction caused by its own physical properties.

[0047] During the combustion process, the airflow from the primary fan 7, secondary fan 8, and combustible exhaust gas needs to be evenly diffused within the combustion chamber to ensure sufficient contact between the gasified fine slag and oxygen. The presence of the boiling material 5 helps change the flow path and distribution of the airflow, dispersing and buffering the airflow as it passes through the boiling material 5 layer, thereby forming a relatively uniform airflow field within the second combustion chamber 4. This uniform airflow distribution provides a stable oxygen supply environment for the combustion of the gasified fine slag, thereby improving combustion efficiency.

[0048] The boiling material 5 causes the gasified slag to be in a state of motion similar to "boiling." The gasified slag continuously tumbles and stirs on the boiling material 5, significantly increasing the contact area and frequency with the surrounding gaseous medium (including combustible waste gas and combustion-supporting air). Compared to static accumulation combustion, the dynamic combustion process significantly strengthens the combustion reaction kinetics, accelerates the combustion reaction rate of the gasified slag, and promotes more complete and rapid combustion of the gasified slag, effectively improving the treatment effect of the gasified slag and reducing the residual unburned material.

[0049] The feeding assembly 2 is composed of a feeder, a loader and a conveyor connected in sequence, which stably transports the gasified fine slag to the second combustion chamber 4, and the output end 16 is located between the combustible waste gas injection port 13 and the boiling material 5, ensuring that the gasified fine slag can accurately fall into the boiling material 5 and be mixed with the combustible waste gas and combustion-supporting air in time to maintain the continuity and stability of the material supply to the second combustion chamber 4.

[0050] The inlet of boiler 10 is connected to the top of furnace 11. The heat from the high-temperature flue gas discharged from the top of furnace 11 is used to produce 20-50 t / h of high-temperature, high-pressure steam, converting combustion heat into steam energy and recovering some of the energy. A waste heat utilization mechanism 9 (such as an economizer and heat exchanger) is connected in series between the outlet of boiler 10 and the post-processing components. The primary and secondary fans 7 and 8 are connected to the pipelines of the co-fired furnace 1 and work in conjunction with the heat exchanger to preheat the input air, improving the overall thermal efficiency of the system, fully utilizing the waste heat value, and reducing energy consumption.

[0051] The boiling combustion design of combustion chamber 2 (4) prolongs the combustion time of gasified fine slag in the high-temperature zone, significantly improving the combustion rate. This effectively solves the problem of difficult combustion of gasified fine slag, achieves efficient resource recycling, reduces solid waste storage pollution, and processes large quantities of gasified fine slag daily, significantly reducing the company's environmental burden. The staged utilization of combustible waste gas in combustion chambers 1 (3) and 2, and the recycling of waste heat within the system, establish a highly efficient energy utilization network. This reduces reliance on external fuels and lowers operating costs. The waste gas drives the combustion of gasified fine slag and converts it into steam energy, improving overall energy utilization efficiency and enhancing the company's energy self-sufficiency and economic benefits.

[0052] Furthermore, the close coordination and collaboration of all components, with the loading, combustion, and heat exchange processes seamlessly linked, ensures long-term, stable system operation. Stable material supply, uniform combustion, and efficient waste heat recovery reduce equipment failures and maintenance requirements, improve production continuity, and provide coal chemical companies with reliable gasification fine slag treatment and energy utilization solutions, contributing to their sustainable development.

[0053] Specifically, such as Figure 1 As shown, the combustible waste gas source 12 is connected to the second combustion chamber 4 through a pipeline, which is a combustible waste gas injection port 13. The axis of the combustible waste gas injection port 13 is arranged tangentially compared to the inner wall of the furnace 11 where it is located, so as to output a tangential combustible waste gas flow.

[0054] It should be pointed out that the main function of the structure for injecting combustible waste gas is to enhance the airflow disturbance and mixing effect in the second combustion chamber 4, thereby achieving technical effects such as improving combustion efficiency, promoting full combustion of gasified fine slag, and improving the temperature distribution of the furnace 11.

[0055] The tangential arrangement of the combustible waste gas injection port 13 allows the combustible waste gas to be ejected at high speed along the tangential direction of the inner wall of the furnace 11 when entering the second combustion chamber 4, thereby forming a rotating airflow in the second combustion chamber 4. The rotating airflow can produce a stirring effect and continuously stir the inside of the furnace 11.

[0056] In the secondary combustion chamber 4, the gasified fine slag is transported by the loading assembly 2 onto the boiling material 5 for combustion. The tangential flow of combustible waste gas effectively drives the gasified fine slag particles, allowing them to mix thoroughly with the combustion-supporting air and other combustible waste gas delivered by the secondary fan 8. Because the gasified fine slag is inherently non-combustible, this good mixing ensures its full contact with oxygen, creating favorable conditions for the combustion reaction.

[0057] By promoting the thorough mixing of gasified fine slag with combustible waste gas and combustion-supporting air, the contact area and opportunity for reaction are increased, enabling more complete combustion of the gasified fine slag. Compared to traditional air intake methods, the tangential air intake structure helps improve the combustion conversion rate of gasified fine slag, reduce unburned residue, and enhance the overall system's processing capacity for gasified fine slag and energy recovery efficiency.

[0058] The rotating airflow forms a relatively stable flow field within the furnace 11, helping to maintain combustion stability. This prevents unstable phenomena such as localized over-combustion or flameout, making the combustion process within the second combustion chamber 4 more uniform and continuous, and ensuring reliable system operation. The rotating motion of the tangential combustible exhaust gas flow within the furnace 11 facilitates the uniform distribution of heat within the second combustion chamber 4. This prevents the combustion of the gasified fine slag from being affected by the presence of localized high or low temperature areas, making the temperature field within the furnace 11 more reasonable and creating a favorable thermal environment for the efficient combustion of the gasified fine slag.

[0059] like Figure 1 As shown, an exhaust blower 6 is installed on the pipeline connecting the first combustion chamber 3 to the combustible exhaust gas source 12 to ensure that the combustible exhaust gas can be stably and smoothly transported to the first combustion chamber 3. In this embodiment, the exhaust blower 6 is a Roots blower. Because the combustible exhaust gas may experience pressure fluctuations or unstable flow, the exhaust blower 6 can provide sufficient power to overcome pipeline resistance, ensure that the first combustion chamber 3 has an adequate supply of combustible exhaust gas, and maintain a stable combustion state. This enhances the stability and reliability of combustion in the first combustion chamber 3, ensures the continuous combustion process, and provides stable high-temperature flue gas and heat support for the subsequent combustion of gasified fine slag in the second combustion chamber 4.

[0060] The pipelines of the primary fan 7 connected to the first combustion chamber 3 and the pipelines of the secondary fan 8 connected to the second combustion chamber 4 are respectively coordinated with the waste heat utilization mechanism 9. The waste heat from the waste heat utilization mechanism 9 is input into the co-combustion furnace 1, making full use of the waste heat in the system and improving energy utilization efficiency. During the combustion of combustible waste gas and gasified fine slag, a large amount of high-temperature flue gas will be generated. The heat carried by the flue gas can be used to preheat the air delivered by the primary fan 7 and the secondary fan 8 through the waste heat utilization mechanism 9. After the preheated air enters the first combustion chamber 3 and the second combustion chamber 4, it can promote the combustion reaction faster, reduce the demand for additional energy during the combustion process, and reduce the energy consumption of the system. It realizes the recovery and reuse of energy, reduces the operating cost of the system, and improves the thermal efficiency of the entire system. It helps to improve the combustion efficiency in the combustion chamber, enables the fuel to burn more fully, and further improves the performance of the system.

[0061] like Figure 1 As shown, vertically along the furnace 11, the output end 16 of the feeding assembly 2 is located between the combustible waste gas injection port 13 and the boiling material 5, ensuring that the gasified fine slag immediately contacts the combustible waste gas and boiling material 5 upon entering the second combustion chamber 4. This allows the gasified fine slag to be quickly drawn into the combustion process, fully utilizing the heat and airflow environment within the combustion chamber, reducing the uncertainty of the gasified fine slag's residence time within the furnace 11, and improving the timeliness and efficiency of combustion. This optimizes the combustion process of the gasified fine slag, enabling it to reach a combustion state more quickly, improving combustion efficiency, and also reducing combustion problems that may be caused by the accumulation or uneven distribution of the gasified fine slag.

[0062] A flue gas outlet is provided on the top side of the furnace 11. The elevation between the flue gas outlet and the output end 16 of the loading assembly 2 is configured to ensure that the gasified fine slag is fully combusted within the furnace 11. Reasonable design of the flue gas outlet's position and elevation can control the residence time and flow path of the flue gas within the furnace 11. This ensures that the flue gas can fully release heat before exiting the furnace 11, providing a sufficiently high temperature environment for the combustion of the gasified fine slag, while also preventing heat loss caused by premature flue gas discharge.

[0063] In this embodiment, the residence time of the gasified fine slag within furnace 11 is controlled to exceed 10 seconds, and the cross-sectional flow velocity within furnace 11 is controlled to be less than 2 m / s. The combustible exhaust gas in combustion chamber 1 3 forms flue gas at a temperature of 700°C to 950°C. In combustion chamber 2 4 , the combustible flue gas forms an environment at a temperature of 900°C to 1150°C, enabling the gasified fine slag to be fully combusted. This improved temperature uniformity within furnace 11 facilitates the full combustion of the gasified fine slag in a high-temperature environment, further improving combustion efficiency and enhancing the thermal efficiency of the system.

[0064] The feeder, loader, and conveyor of the loading assembly 2 are connected in sequence to achieve stable and continuous transportation of the gasified fine slag. The conveyor passes through the side wall of the co-firing furnace 1 and connects to the second combustion chamber 4. The connection point forms the output end 16 of the loading assembly 2. The fine particle size and high moisture content of the gasified fine slag are prone to blockage and poor transportation. The multi-stage conveying structure can overcome these problems and ensure that the gasified fine slag can reach the second combustion chamber 4 smoothly.

[0065] Output end 16 is provided with multiple, spaced-apart output ports, each connected to secondary combustion chamber 4. This ensures that the gasified fine slag is evenly distributed within secondary combustion chamber 4, preventing localized accumulation and ensuring sufficient contact and mixing between the gasified fine slag, combustible waste gas, and combustion-supporting air. This improves the reliability and stability of material feeding, ensures a continuous material supply to secondary combustion chamber 4, promotes uniform combustion of the gasified fine slag within the combustion chamber, and enhances combustion efficiency and treatment results.

[0066] The location where the secondary fan 8 is connected to the second combustion chamber 4 via a pipeline is the combustion-supporting air port 14. Multiple combustion-supporting air ports 14 are provided and spaced apart. The combustion of gasified fine slag requires sufficient oxygen. These multiple, spaced-apart combustion-supporting air ports 14 allow the combustion air provided by the secondary fan 8 to be evenly distributed throughout the second combustion chamber 4, ensuring that the gasified fine slag receives sufficient oxygen at all locations. This improves the combustion efficiency of the gasified fine slag, making the combustion process more complete and stable, and reducing incomplete combustion caused by insufficient oxygen.

[0067] like Figure 1 As shown, the boiler 10 is provided with heat exchange pipes, the waste heat utilization mechanism 9 includes an economizer and a heat exchanger, and the pipelines of the primary fan 7 and the secondary fan 8 connected to the co-firing furnace 1 are respectively preheated in conjunction with the heat exchanger. In addition, corresponding SCR equipment can also be provided in the waste heat utilization mechanism 9 to perform corresponding treatment on the flue gas.

[0068] The heat exchange tubes within boiler 10 absorb heat from the high-temperature flue gas generated by combustion, heating water and converting it into high-temperature, high-pressure steam. Boiler 10 is connected to a water source 20 via a pipeline, supplying water to the water-cooled walls or water-cooled coils of boiler 10. This converts combustion heat into steam energy, making it one of the primary heat recovery components in the system. The economizer and heat exchanger within waste heat utilization mechanism 9 further recycle waste heat from the flue gas discharged by boiler 10. The economizer is primarily used to preheat the feed water to boiler 10, raising its temperature and reducing fuel consumption; the heat exchanger is responsible for preheating the air in the pipelines connecting primary and secondary fans 7 and 8 to the co-fired furnace 1.

[0069] The air delivered by the primary fan 7 and the secondary fan 8 is preheated by exchanging heat with the high-temperature flue gas waste heat through the heat exchanger before entering the first combustion chamber 3 and the second combustion chamber 4. This can increase the initial temperature of the air when it enters the combustion chamber, so that the fuel can reach the ignition point and burn fully in the combustion chamber more quickly, thereby enhancing the combustion effect. At the same time, it reduces the demand for additional fuel during the combustion process and improves energy utilization efficiency.

[0070] like Figure 2 As shown, the post-processing component includes a bag filter 17, an induced draft fan 18 and a chimney 19 which are connected in sequence. The chimney 19 is provided with a corresponding desulfurization component, and the bag filter 17 is connected to the flue gas outlet of the waste heat utilization component. As the first purification equipment, the bag filter 17 uses the filtering effect of the bag to intercept particulate matter in the flue gas and prevent it from being discharged into the atmosphere and causing pollution. The induced draft fan 18 provides power for the flow of the flue gas, ensuring that the flue gas can smoothly pass through the bag filter 17 and the subsequent desulfurization components in sequence, and finally be discharged from the chimney 19. The desulfurization component in the chimney 19 is used to remove acidic gases such as sulfur dioxide in the flue gas, reduce the pollutancy of the flue gas, and make it meet environmental emission standards.

[0071] The bag filter 17 is connected to the flue gas outlet of the waste heat recovery component, allowing the flue gas after waste heat recovery to enter the post-processing process in an orderly manner. This achieves a close connection between heat utilization and flue gas purification in the entire system, ensuring the consistency and stability of the system. The bag filter 17 and the desulfurization component effectively remove particulate matter and acid gases from the flue gas, greatly reducing the degree of flue gas pollution, ensuring that the company's waste gas emissions comply with environmental regulations, reducing negative impacts on the surrounding environment, and protecting the ecological environment.

[0072] Example 2

[0073] In another typical embodiment of the present invention, Figure 1-Figure 2 As shown, a working method of a coal gasification fine slag multi-mixed combustion conversion boiler system is provided, using the coal gasification fine slag multi-mixed combustion conversion boiler system as in Example 1.

[0074] A method for operating a coal gasification fine slag multi-mix combustion conversion boiler system, comprising:

[0075] Hot air is charged into the first combustion chamber 3 or combustible gas is burned in the first combustion chamber 3 to generate hot air, and the hot air passes through the air distribution plate and enters the second combustion chamber 4 to heat the boiling material 5 and the second combustion chamber 4;

[0076] The feeding assembly transports the gasified fine slag to the second combustion chamber 4 and lands on the boiling material 5; the gasified fine slag is dried and boiled in a high-temperature environment, and the gasified fine slag is fully burned in the high-temperature area of ​​the second combustion chamber 4, and the temperature in the second combustion chamber 4 is maintained;

[0077] The flue gas generated by the second combustion chamber 4 is transported to the boiler 10, and the heat contained in the flue gas is recovered and utilized.

[0078] Specifically, the example of charging the combustible waste gas into the combustion chamber 3 for combustion is used for explanation.

[0079] The combustible waste gas and the air flow delivered by the primary fan 7 are input into the burner 15 together, so that the combustible waste gas is burned in the first combustion chamber 3, and the flue gas passes through the air distribution plate and enters the second combustion chamber 4;

[0080] The feeding assembly 2 transports the gasified fine slag to the second combustion chamber 4 and lands on the boiling material 5. The combustible waste gas and the air flow transported by the secondary fan 8 are jointly input into the second combustion chamber 4, causing the gasified fine slag to boil and burn. The gasified fine slag is fully burned in the high temperature area of ​​the second combustion chamber 4.

[0081] The flue gas generated by the second combustion chamber 4 is transported to the boiler 10 and the waste heat utilization component to recover and utilize the heat contained in the flue gas.

[0082] The height of the second combustion chamber 4 is set to meet the requirement of sufficient combustion time of gasified fine slag in the second combustion chamber 4. After the combustible waste gas is burned in the first combustion chamber 3, a high temperature environment is provided for the second combustion chamber.

[0083] Make full use of the internal combustible waste gas energy to drive the combustion process, reduce the cost of external fuel procurement, recover waste heat to preheat air and produce steam, improve the overall energy efficiency of the system, reduce energy consumption costs, optimize the entire energy utilization process, enhance the company's economic benefits and competitiveness, and transform waste into energy assets.

[0084] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A coal gasification fine slag multi-mix combustion conversion boiler system, characterized in that: include: A mixed combustion furnace has a first combustion chamber formed below the furnace and a second combustion chamber formed inside the furnace. An air distribution plate with an air hood is provided between the first and second combustion chambers. The air hood of the air distribution plate is provided with a boiling material for carrying gasified fine slag. The first combustion chamber is used to fill with hot air or to generate hot air from combustion and supply it to the second combustion chamber, so that the second combustion chamber forms an environment for combustion of gasified fine slag. A feeding assembly is provided with an output end and is connected to the second combustion chamber to supply gasified fine slag to the second combustion chamber; The heat exchange component includes a boiler. The inlet end of the boiler is connected to the top of the furnace and forms a height difference with the output end of the feeding component. The outlet end of the boiler is connected to the post-processing component through a waste heat utilization mechanism. An exhaust gas fan is installed on the pipeline connecting the first combustion chamber to the combustible waste gas source. The pipeline connecting the primary fan to the first combustion chamber and the pipeline connecting the secondary fan to the second combustion chamber are respectively equipped with waste heat utilization mechanisms. After the waste heat is discharged from the waste heat utilization mechanism, it is input into the co-burning furnace. The first combustion chamber is equipped with a burner, which is connected to the primary fan and the combustible waste gas source through pipelines, and the second combustion chamber is connected to the secondary fan and the combustible waste gas source through pipelines; The combustible waste gas source is connected to the second combustion chamber through a pipeline, and the combustible waste gas injection port is provided. The axis of the combustible waste gas injection port is arranged tangentially to the inner wall of the furnace where it is located, so as to output a tangential combustible waste gas flow; Vertically along the furnace, the output end of the charging assembly is located between the combustible waste gas injection port and the boiling material.

2. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 1, characterized in that: A flue gas outlet is provided on the side of the top of the furnace, and the elevation between the flue gas outlet and the output end of the feeding assembly is configured to allow the gasified fine slag to be fully burned in the furnace.

3. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 1, characterized in that: The feeding assembly includes a feeder, a loader and a conveyor which are connected in sequence to transport the gasified fine slag. The conveyor passes through the side wall of the co-burning furnace and is connected to the second combustion chamber. The connection position forms the output end of the feeding assembly.

4. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 3, characterized in that: The output end includes a plurality of output ports arranged at intervals and connected to the second combustion chamber respectively. The second combustion chamber is connected to the combustion-supporting air through the combustion-supporting air port. There are a plurality of combustion-supporting air ports and they are distributed at intervals.

5. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 1, characterized in that: The first combustion chamber is filled with hot air, which passes through the air distribution plate and enters the second combustion chamber to heat the boiling material and the second combustion chamber, so that the gasified fine slag is dried and exploded in the second combustion chamber.

6. An operating method of a coal gasification fine slag multi-mix combustion conversion boiler system, utilizing the coal gasification fine slag multi-mix combustion conversion boiler system according to any one of claims 1 to 5, characterized in that: include: Hot air is charged into the first combustion chamber or combustible waste gas is burned in the first combustion chamber to generate hot air, and the hot air passes through the air distribution plate and enters the second combustion chamber to heat the boiling material and the second combustion chamber; The feeding assembly transports the gasified fine slag to the second combustion chamber and drops it onto the boiling material; the gasified fine slag is dried and boiled in a high-temperature environment, and the gasified fine slag is fully burned in the high-temperature area of ​​the second combustion chamber, and the temperature in the second combustion chamber is maintained; The flue gas generated in the second combustion chamber is transported to the boiler to recover the heat contained in the flue gas.

7. The operating method of the coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 6, characterized in that: The height of the second combustion chamber is set to meet the requirement of sufficient combustion time of gasified fine slag in the second combustion chamber. The hot air in the first combustion chamber is input into the second combustion chamber through the air distribution plate to provide a high temperature environment for the second combustible chamber.

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