Coal gasification fine slag multi-mixing combustion conversion boiler system and working method

Abstract

The invention provides a coal gasification fine slag multi-mixing combustion conversion boiler system and a working method, relates to the technical field of environmental protection, and aims at solving the problems that at present, gasification fine slag which is solid waste not prone to combustion is difficult to treat, the blending combustion proportion of the gasification fine slag is low, and the operation efficiency is low. Waste gas serves as fuel to participate in combustion, energy recycling is achieved, dependence on additional fuel is reduced, a combustion engine of the first combustion chamber and the second combustion chamber are both connected into a combustible waste gas source, so that combustible waste gas can be fully combusted in the system, energy is provided for system operation, the operation cost is reduced, and the feeding assembly can supply gasified fine slag to the second combustion chamber. The boiling material for bearing the gasified fine slag is arranged on the air distribution plate, so that the combustion efficiency of the gasified fine slag is improved, the mixed combustion furnace realizes multi-mixed combustion, and the treatment requirements of coal chemical enterprises on the gasified fine slag are met.

Description

Technical Field

[0001] The 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 industry (fertilizer, methanol, coal-to-liquid, olefin) and other enterprises produce a large amount of coal gasification fine slag (or filter cake or coal slime) in their production process. It is very fine, accounting for 75% of the slag above 200 mesh, no volatile matter, semi-coke characteristics, not easy to burn, dry basis carbon content 18-22%, water content 45-52%, low calorific value 800-900kcal / kg, daily production of 300-500 tons, conventional means can not make it burn normally, or the combustion rate is less than 50%. At present, the three wastes fluidized bed co-combustion furnace device is commonly used to treat industrial three wastes. The principle of the three wastes fluidized bed co-combustion furnace is to utilize the principle of coal (slag) boiling combustion, gasification blowing to match the wind mixed combustion method, with the help of some circulating fluidized bed technology, adopt the membrane type of gasification blowing gas waste heat recovery, the gasification furnace slag, gasification dust collector fine ash, etc. generated in the production process of fixed bed gasification, add part of the bituminous coal to the furnace for fluidized combustion and ignite the blowing gas to generate high-temperature flue gas, and realize heat recovery. However, it has high requirements on the combustion value of industrial waste and is difficult to handle 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 handle alone.

[0003] A Chinese patent (publication number CN 111121059 B, publication date 20200508) discloses an energy-saving and environmentally friendly treatment system for industrial three wastes mixed combustion 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 mix and burn 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, and requires additional fuel supply, which increases the operating cost and dependence on external energy. In addition, the waste residue in the three wastes it targets is a conventional solid waste. 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 is 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 provide a coal gasification fine slag multi-mixed combustion conversion boiler system and a working method in view of the defects of the prior art. 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 the operating cost. The feeding component can supply the 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 the 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 arranged between the combustion chamber 1 and the combustion chamber 2. The air hood of the air distribution plate is provided with a boiling material carrying gasified fine slag. The combustion chamber 1 is used to fill 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 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 respectively connected to a primary air fan and a combustible gas source through pipelines, and the second combustion chamber is respectively connected to a secondary air fan and a combustible gas source through pipelines.

[0011] Furthermore, the combustible gas source is a waste 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 to the inner wall of the furnace where it is located, so as 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, 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, and the waste heat from the waste heat utilization mechanism is input into the co-combustion furnace.

[0015] Furthermore, the feeding assembly includes a feeder, a loader and a conveyor which are connected in sequence to transport gasified fine slag. The conveyor passes through the side wall of the co-combustion 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 connected to the second combustion chamber respectively. The second combustion chamber is connected to the combustion-supporting air through the combustion-supporting air port. The combustion-supporting air port is provided in plurality and 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-burning furnace are respectively preheated in cooperation 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] The second object of the present invention is to provide a working method of the coal gasification fine slag multi-mixed combustion conversion boiler system as described in the first object, comprising:

[0020] Fill the first combustion chamber with hot air or burn combustible gas 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, 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 view of the current problems that gasified fine slag, a non-combustible solid waste, is difficult to treat, has a low blending ratio and low operating efficiency, a system suitable for the treatment of gasified fine slag is adopted, and a 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 burners of combustion chamber one and combustion chamber two 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 system operation and reducing operating costs. The feeding component can supply gasified fine slag to combustion chamber two, 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, and the co-combustion furnace realizes multi-mixed combustion, thereby meeting the coal chemical enterprises' needs for the treatment of gasified fine slag.

[0026] Make full use of the internal combustible waste gas energy to drive the combustion process, reduce external fuel procurement costs, recover waste heat to preheat air and produce steam, improve the overall energy efficiency of the system, reduce energy consumption costs, optimize the entire process of energy utilization, 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 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); the process waste gas can also be used as combustible waste gas to fill the first combustion chamber for combustion to generate hot air, thereby improving the flexibility of the co-combustion furnace.

[0028] The primary and secondary fans are connected to the pipeline and preheated with the waste heat utilization mechanism to reduce energy consumption; multiple feeding components cooperate 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 exhaust gas injection port allows the combustible exhaust 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 exhaust gas flow can effectively drive the gasified fine slag particles, so that it is fully mixed with the combustion-supporting air transported by the secondary fan and other combustible exhaust gases. Since the gasified fine slag itself is not easy to burn, a 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 in the specification, 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 It is a schematic diagram of a co-combustion furnace and a boiler of a coal gasification fine slag multi-mixed combustion conversion boiler system in one or more embodiments of the present invention.

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

[0033] Among them, 1. Co-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% 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 explored its synergistic efficiency potential in the combustion process of gasified fine slag. At the same time, the previous system has 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 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 can supply gasified fine slag to the second combustion chamber 4, and the air distribution plate is provided with a boiling material 5 for carrying the gasified fine slag, which helps to improve the combustion efficiency of the gasified fine slag, and the mixed combustion furnace 1 realizes multi-mixed combustion, thereby meeting the processing needs of coal chemical enterprises for gasified fine slag. A hood is installed on the air distribution plate, and the hood is used to carry the gasified fine slag. The air distribution plate and the hood are both 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 the air with other combustible gases (coal gas, natural gas). Unlike the combustion of 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 hot air, the operation requirements of the co-combustion 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 (heating the air by using a heater), the hot air can also be obtained by burning process waste gas alone to heat the air, and the hot air can also be obtained 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 combustion chamber 2 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, and the combustible gas source 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 supplies combustible exhaust gas to the combustion chamber 3 for detailed explanation.

[0041] A furnace 11 is provided in the mixed combustion furnace 1, a first combustion chamber 3 is formed below the furnace 11, a second combustion chamber 4 is formed in the furnace 11, an air distribution plate is provided between the first combustion chamber 3 and the second combustion chamber 4, 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 first combustion chamber 3 can be input into the second combustion chamber 4, creating a high temperature environment for the second combustion chamber 4, the burner 15 of the first combustion chamber 3 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 first combustion chamber 3; the second combustion chamber 4 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 second combustion chamber 4 can burn and release heat in the second combustion chamber 4.

[0042] The combustible waste gas in this embodiment comes from multiple production links. For example, synthesis venting 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 the comprehensive utilization of energy 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 constructed inside the furnace 11, separated by an air distribution plate. The first combustion chamber 3 uses a burner 15 in combination with a primary fan 7 and a combustible waste gas source 12 to provide energy for starting and maintaining the combustion process, and allows the high-temperature flue gas (800-1000°C) after combustion to be introduced into the second combustion chamber 4 in an orderly manner through the wind chamber, air distribution plate and wind cap, preheating the environment of the second combustion chamber 4, forming a heat ladder utilization structure.

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

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

[0047] During the combustion process, the airflow of the primary fan 7, the secondary fan 8 and the combustible exhaust gas needs to be evenly diffused in the combustion chamber to ensure that the gasified fine slag is fully in contact with oxygen. The presence of the boiling material 5 helps to change the flow path and distribution mode of the airflow, so that the airflow is dispersed and buffered when passing through the boiling material 5 layer, thereby forming a relatively uniform airflow field in the second combustion chamber 4. This uniform airflow distribution can provide a stable oxygen supply environment for the combustion of the gasified fine slag and improve the combustion efficiency.

[0048] The boiling material 5 puts the gasified fine slag in a motion state similar to "boiling". The gasified fine slag keeps rolling and stirring on the boiling material 5, which greatly increases the contact area and frequency between the gasified fine slag and the surrounding gas medium (including combustible waste gas and combustion-supporting air). Compared with the static accumulation combustion method, the dynamic combustion process significantly strengthens the combustion reaction kinetic conditions, accelerates the combustion reaction rate of the gasified fine slag, promotes more complete and rapid combustion of the gasified fine slag, effectively improves the treatment effect of the gasified fine slag, and reduces the residue of unburned substances.

[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, to ensure 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 the boiler 10 is connected to the top of the furnace 11, and the heat of the high-temperature flue gas discharged from the top of the furnace 11 is used to produce 20-50t / h of high-temperature and high-pressure steam, realizing the conversion of combustion heat energy into steam heat energy and recovering part of the energy. The waste heat utilization mechanism 9 (such as economizer and heat exchanger) is connected in series between the outlet of the boiler 10 and the post-processing components. The primary fan 7 and the secondary fan 8 are connected to the pipeline of the mixed combustion furnace 1 and the heat exchanger to cooperate to preheat the input air, improve the overall thermal efficiency of the system, fully tap the value of waste heat, and reduce energy consumption.

[0051] The boiling combustion design of the second combustion chamber 4 prolongs the combustion time of gasified fine slag in the high temperature zone and greatly improves the combustion rate, effectively solving the problem of difficult combustion of gasified fine slag, realizing efficient resource recycling, reducing solid waste storage pollution, and processing a large amount of gasified fine slag daily, which significantly reduces the environmental protection burden of the enterprise. The graded utilization of combustible waste gas in the first combustion chamber 3 and the second combustion chamber and the recycling of waste heat in the system build an efficient energy utilization network. Reduce external fuel dependence and reduce operating costs. Waste gas drives the combustion of gasified fine slag and converts it into steam energy, improving the comprehensive utilization efficiency of energy, and enhancing the energy self-sufficiency and economic benefits of the enterprise.

[0052] In addition, all components work closely together, and the feeding, combustion, and heat exchange links are connected in an orderly manner to ensure the long-term stable operation of the system. Stable material supply, uniform combustion process, 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, helping companies achieve sustainable development.

[0053] Specifically, Figure 1 As shown, the combustible waste gas source 12 is connected to the second combustion chamber 4 through a pipeline to form a combustible waste gas injection port 13. The axis of the combustible waste gas injection port 13 is arranged tangentially to the inner wall of the furnace 11 where it is located 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 temperature distribution in 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 second combustion chamber 4, the gasified fine slag is transported by the feeding assembly 2 to the boiling material 5 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 8. Since the gasified fine slag itself is not easy to burn, a good mixing effect can ensure that it is fully in contact with oxygen, providing favorable conditions for the combustion reaction.

[0057] By promoting the full mixing of gasified fine slag with combustible waste gas and combustion-supporting air, the contact area and opportunity of the reaction are increased, so that the gasified fine slag can be burned more fully. Compared with the traditional air intake method, the tangential air intake structure helps to improve the combustion conversion rate of gasified fine slag, reduce unburned residues, and improve the whole system's processing capacity for gasified fine slag and energy recovery efficiency.

[0058] The rotating airflow forms a relatively stable flow field in the furnace 11, which helps to maintain the stability of combustion. It can prevent the occurrence of unstable phenomena such as excessive local combustion or flameout, making the combustion process in the second combustion chamber 4 more uniform and continuous, and ensuring the reliable operation of the system. The rotating motion of the tangential combustible exhaust gas flow in the furnace 11 is conducive to the uniform distribution of heat in the second combustion chamber 4. It avoids the combustion effect of the gasified fine slag being affected by the existence of local high temperature or low temperature areas, makes the temperature field in the furnace 11 more reasonable, and creates a good thermal environment for the efficient combustion of the gasified fine slag.

[0059] like Figure 1 As shown, an exhaust gas blower 6 is installed on the pipeline of the combustion chamber 3 connected to the combustible exhaust gas source 12 to ensure that the combustible exhaust gas can be stably and smoothly transported to the combustion chamber 3. The exhaust gas blower 6 in this embodiment is a Roots blower. Since the combustible exhaust gas may have pressure fluctuations or unstable flow, the exhaust gas blower 6 can provide sufficient power to overcome the pipeline resistance, ensure that the combustion chamber 3 has sufficient combustible exhaust gas supply, and maintain a stable combustion state. The stability and reliability of the combustion in the combustion chamber 3 are enhanced, the combustion process is ensured to continue, and stable high-temperature flue gas and heat support are provided for the subsequent combustion of gasified fine slag in the combustion chamber 4.

[0060] The pipeline of the primary fan 7 connected to the first combustion chamber 3 and the pipeline of the secondary fan 8 connected to the second combustion chamber 4 cooperate with the waste heat utilization mechanism 9 respectively, and the waste heat from the waste heat utilization mechanism 9 is input into the mixed combustion furnace 1, so as to make full use of the waste heat in the system and improve the energy utilization efficiency. A large amount of high-temperature flue gas will be generated during the combustion of combustible waste gas and gasified fine slag. The heat carried by the flue gas can be used to preheat the air transported 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, enable the fuel to burn more fully, and further improve 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 can immediately contact the combustible waste gas and the boiling material 5 after entering the second combustion chamber 4. The gasified fine slag can be quickly involved in the combustion process, making full use of the heat and airflow environment in the combustion chamber, reducing the uncertainty of the residence time of the gasified fine slag in the furnace 11, and improving the timeliness and efficiency of combustion. The combustion process of the gasified fine slag is optimized, so that it can reach the combustion state faster, improve the combustion efficiency, and also reduce the 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, and the elevation between the flue gas outlet and the output end 16 of the feeding assembly 2 is configured to allow the gasified fine slag to be fully burned in the furnace 11. The location and elevation of the flue gas outlet are reasonably designed to control the residence time and flow path of the flue gas in the furnace 11. It is ensured that the flue gas can fully release heat before being discharged from the furnace 11, providing a sufficiently high temperature environment for the combustion of the gasified fine slag, and avoiding heat loss caused by premature discharge of the flue gas.

[0063] In this embodiment, the residence time of the gasified fine slag in the furnace 11 is controlled to be more than 10s, the cross-sectional flow velocity in the furnace 11 is controlled to be less than 2m / s, the combustible waste gas in the first combustion chamber 3 is burned to form flue gas of 700℃-950℃, and in the second combustion chamber 4, the combustible flue gas is burned to form an environment of 900℃-1150℃, so that the gasified fine slag can be fully burned. By improving the uniformity of temperature distribution in the furnace 11, it is beneficial for the gasified fine slag to be fully burned in a high temperature environment, further improving the combustion efficiency, and also improving the heat utilization efficiency of the system.

[0064] The feeder, the loading machine and the conveyor of the loading assembly 2 are connected in sequence to realize the stable and continuous transportation of the gasified fine slag. The conveyor passes through the side wall of the co-combustion furnace 1 and is connected to the second combustion chamber 4. The connecting position forms the output end 16 of the loading assembly 2. The gasified fine slag has a fine particle size and a high water content, which is prone to blockage or poor transportation. These problems can be overcome by a multi-stage conveying structure to ensure that the gasified fine slag can smoothly reach the second combustion chamber 4.

[0065] The output end 16 is provided with a plurality of output ports arranged at intervals and connected to the second combustion chamber 4 respectively, so that the gasified fine slag can be evenly distributed in the second combustion chamber 4, avoiding local accumulation, and ensuring that the gasified fine slag is fully contacted and mixed with the combustible waste gas and the combustion-supporting air. The reliability and stability of the material feeding are improved, the continuity of the material supply to the second combustion chamber 4 is ensured, the uniform combustion of the gasified fine slag in the combustion chamber is promoted, and the combustion efficiency and treatment effect are improved.

[0066] The position where the secondary fan 8 is connected to the second combustion chamber 4 through a pipeline is the combustion-supporting air port 14. There are multiple combustion-supporting air ports 14 and they are spaced apart. The combustion of gasified fine slag requires sufficient oxygen support. Multiple spaced apart combustion-supporting air ports 14 can make the combustion-supporting air provided by the secondary fan 8 evenly diffuse to various areas of the second combustion chamber 4, ensuring that the gasified fine slag can obtain sufficient oxygen at different positions. The combustion efficiency of the gasified fine slag is improved, the combustion process is made more complete and stable, and the incomplete combustion caused by insufficient oxygen is reduced.

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

[0068] The heat exchange tubes in the boiler 10 are used to absorb the heat in the high-temperature flue gas generated by combustion, and heat the water to convert it into high-temperature and high-pressure steam. The boiler 10 is connected to the water source 20 through a pipeline, and water is supplied to the water-cooled wall or water-cooled coil of the boiler 10 through the water source 20, realizing the conversion of combustion heat energy into steam heat energy. It is one of the main heat recovery components in the system. The economizer and heat exchanger in the waste heat utilization mechanism 9 further recycle the waste heat of the flue gas discharged by the boiler 10. The economizer is mainly used to preheat the feed water of the boiler 10, increase the feed water temperature, and reduce fuel consumption; the heat exchanger is responsible for preheating the air in the pipeline connecting the primary fan 7 and the secondary fan 8 to the mixed combustion 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 a 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-treatment 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 to 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 to ensure 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 the environmental emission standards.

[0071] The bag filter 17 is connected to the flue gas outlet of the waste heat utilization component, so that the flue gas after waste heat recovery can enter the post-processing process in an orderly manner, realizing the close connection between the heat utilization and flue gas purification links in the entire system, and ensuring the consistency and stability of the system. Through the purification of flue gas by the bag filter 17 and the desulfurization component, particulate matter and acidic gases in the flue gas are effectively removed, greatly reducing the degree of pollution of the flue gas to the environment, ensuring that the company's waste gas emissions meet the requirements of environmental protection regulations, reducing the negative impact 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 working method of 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 drops it 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 smoke 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 drops it on the boiling material 5; the combustible waste gas and the airflow transported by the secondary fan 8 are jointly input into the second combustion chamber 4, so that the gasified fine slag is boiled and burned, and 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 external fuel procurement costs, recover waste heat to preheat air and produce steam, improve the overall energy efficiency of the system, reduce energy consumption costs, optimize the entire process of energy utilization, enhance the company's economic benefits and competitiveness, and transform waste into energy assets.

[0084] 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 gasification fine slag multi-mix combustion conversion boiler system, characterized in that: include: A mixed combustion furnace, wherein a first combustion chamber is formed below the furnace, and a second combustion chamber is formed in the furnace, an air distribution plate with an air hood is arranged between the first combustion chamber and the second combustion chamber, and a boiling material carrying gasified fine slag is arranged on the air hood of the air distribution plate, and the first combustion chamber is used to fill hot air or burn hot air to supply it to the second combustion chamber, so that the second combustion chamber forms an environment for the 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, and the outlet end of the boiler is connected to the post-processing component.

2. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 1, characterized in that: The first combustion chamber is equipped with a burner, which is respectively connected to a primary air fan and a combustible gas source through pipelines, and the second combustion chamber is respectively connected to a secondary air fan and a combustible gas source through pipelines.

3. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 2, characterized in that: The combustible gas source is an exhaust gas source and / or a combustible gas source. 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 to the inner wall of the furnace where it is located to output a tangential combustible gas flow.

4. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 2 or 3, characterized in that: Vertically along the furnace, the output end of the charging assembly is located between the combustible waste gas injection port and the boiling material.

5. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 4, characterized in that: A flue gas outlet is provided on the side of the furnace top, and the height 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; An exhaust gas fan is installed on the pipeline connecting the first combustion chamber to the combustible exhaust gas source. 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 cooperate with the waste heat utilization mechanism respectively. The waste heat from the waste heat utilization mechanism is input into the co-combustion furnace.

6. 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 gasified fine slag. The conveyor passes through the side wall of the co-combustion furnace and is connected to the second combustion chamber. The connecting position forms the output end of the feeding assembly.

7. The coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 6, 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. The combustion-supporting air port is provided with a plurality of ports and distributed at intervals.

8. 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, 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.

9. A method for operating a coal gasification fine slag multi-mix combustion conversion boiler system, using the coal gasification fine slag multi-mix combustion conversion boiler system as claimed in any one of claims 1 to 8, characterized in that: include: Fill the first combustion chamber with hot air or burn combustible gas 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, 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 by the second combustion chamber is transported to the boiler to recover the heat contained in the flue gas.

10. The working method of the coal gasification fine slag multi-mixed combustion conversion boiler system according to claim 9, 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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