Fluidized sludge incineration coupling coal-fired unit power generation system

Abstract

The utility model discloses a fluidized sludge incineration coupling coal-fired unit power generation system which comprises a fluidized sludge incineration disposal hearth, a high-temperature air preheater, a separator, a material returning device, a material returning pipe and a feeding pipe. Flue gas of the fluidized sludge incineration disposal hearth is connected with a separator, an outlet of the separator is connected with a flue gas connecting pipeline, a high-temperature air preheater is arranged in the flue gas connecting pipeline, an inlet of the high-temperature air preheater is connected with a fan system, and an outlet of the high-temperature air preheater is connected with a gas inlet of the fluidized sludge incineration disposal hearth. A material returning device is arranged below the separator, and the material returning device and the feeding pipe are communicated with the fluidized sludge incineration disposal hearth through a material returning pipe; a coal feeding device and a denitration device of an original coal-fired boiler are utilized, and independent construction is not needed; high-temperature pipeline arrangement is reduced, and device sealing is facilitated; coal and sludge are fed through a material returning pipe, so that the blocking risk is reduced; combustion air is heated through high-temperature flue gas, and the combustion stability in the fluidized sludge incineration disposal hearth is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid waste utilization, and particularly relates to a fluidized sludge incineration coupled coal-fired power generation system. Background Art

[0002] In recent years, with the continuous expansion of the urban scale and the rapid economic development, the urban sewage discharge has increased significantly, which has increased the amount of sludge generated after sewage treatment. Domestic sewage sludge and industrial sludge are the two main sludge sources. Among the existing sludge disposal technologies, incineration is an effective method that can reduce the sludge volume, stabilize and render it harmless, and has also received policy support and encouragement.

[0003] Co-combustion of sludge and coal is considered a feasible method to reduce carbon emissions in coal-fired power plants. Co-combustion of sludge and coal has obvious advantages: First, it can utilize the mature operation system of coal-fired power plants and experienced operators to dispose of sludge in a more reliable and efficient manner. Second, the calorific value of sludge is low and it is difficult to burn alone, but it can make up for each other after co-combustion with coal. Third, the power plant has mature flue gas purification facilities, which can effectively treat toxic gases and pollutants during the combustion process.

[0004] There are mainly two ways to co-combust sludge with coal: One is to directly feed wet sludge into the furnace for co-combustion. However, due to the low calorific value, high moisture and ash content of sludge, directly feeding it into the furnace for co-combustion will bring certain unstable factors to the boiler operation, such as uneven combustion, low efficiency and large exhaust heat loss. Therefore, usually the second way is adopted: first dry the sludge through a drying device and then co-combust it. Specifically, through the sludge drying device, first reduce the moisture content of the sludge to below 40%, and then use the existing coal conveying system to send the dried sludge into the boiler for combustion. The currently widely used drying devices are divided into conduction type and convection type, and the heat media used are high-temperature flue gas, hot steam or special heat-conducting oil, etc. However, the drying device has a large investment, unstable operation and high failure rate, which also becomes an obstacle to the application of this technology. In addition, in the process of drying sludge through the drying device, the distance between the heat medium extraction point and the sludge drying device is relatively far, the heat medium conveying pipeline has a thick wall, a large volume, and high requirements for alloy materials, so the pipeline cost is high and the construction is complex. Summary of the Invention

[0005] To solve the above problems, the present utility model proposes a fluidized sludge incineration coupled coal-fired power generation system. The drying heat source of this system is not high-temperature flue gas, but directly mixed with coal for combustion. The coal comes from the coal feeding of the coal-fired boiler, so there is no need to additionally set up a coal conveying system. The feeding ports of the sludge and coal in the fluidized sludge incineration disposal furnace are arranged on the return pipe below the separator located on the front wall, without the need to separately open holes on the furnace, and at the same time, the blockage in the feeding pipe can be reduced, and the coal consumption can be reduced.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows: a fluidized sludge incineration coupled coal-fired power generation system, including a fluidized sludge incineration disposal furnace, a high-temperature air preheater, a separator, a return feeder, a return pipe and a feed pipe; the flue gas of the fluidized sludge incineration disposal furnace is connected to the separator, the outlet of the separator is connected to a flue gas connection pipe, a high-temperature air preheater is arranged in the flue gas connection pipe, the inlet of the high-temperature air preheater is connected to a fan system, the outlet of the high-temperature air preheater is connected to the gas inlet of the fluidized sludge incineration disposal furnace, a return feeder is arranged below the separator, and the return feeder and the feed pipe are connected to the fluidized sludge incineration disposal furnace through the return pipe.

[0007] Further, the return pipe is arranged obliquely, the feed pipe is arranged vertically, and an inclined baffle is arranged at the outlet of the feed pipe to prevent the fuel in the feed pipe from directly impacting the inner wall of the return pipe.

[0008] Further, the arranged feed pipe feeds sludge and coal at the same time, the feeding point is located in the return pipe, and the feed pipe is connected to a sludge pretreatment device.

[0009] Further, the feed pipe is connected to the fuel conveying system of the coal-fired boiler.

[0010] Further, the fluidized sludge incineration disposal furnace is used for the mixed combustion of sludge and coal and is an adiabatic furnace.

[0011] Further, the working temperature range of the material used for the high-temperature air preheater is 700-1000°C, and the flue gas connection pipe is made of carbon steel.

[0012] Further, the flue gas connection pipe between the separator and the high-temperature air preheater adopts an abrasion-proof and heat-insulating structural form, and the structural form includes a pipe body, a heat-insulating layer and a refractory and wear-resistant layer from outside to inside in sequence. The pipe body adopts a steel plate or a membrane wall structure, and a heat-insulating layer is arranged outside the pipe body.

[0013] Further, the separator is located on the front wall of the fluidized sludge incineration disposal furnace.

[0014] Further, the separator is a cyclone separator or a gravity separator.

[0015] Further, a coal-fired boiler SCR denitration device is arranged in the downstream flue of the high-temperature air preheater, and the cooled flue gas enters the coal-fired boiler SCR denitration device through the flue gas connection pipe.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects: The heat source for sludge drying in the utility model comes from the direct contact with the coal combustion mixed therewith, reducing the layout of high-temperature pipelines; There are no sludge and coal feeding ports on the fluidized sludge incineration furnace, which is beneficial to the sealing of the device; Coal and sludge are fed through the return pipe, reducing the risk of blockage; A high-temperature air preheater is provided to heat the combustion air with high-temperature flue gas, improving the combustion stability in the fluidized sludge incineration furnace. In addition, the coal feeding device and denitration device of the original coal-fired boiler are utilized without the need for separate construction. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] In the figure: 1 - Fluidized sludge incineration furnace, 2 - High-temperature air preheater, 3 - Separator, 4 - Return feeder, 5 - Return pipe, 6 - Feeding pipe, 7 - Flue gas connection pipe, 8 - Fan system. Detailed Embodiments

[0019] Next, in combination with the drawings in the embodiments of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0020] In the description of the utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations.

[0021] The present invention is a fluidized sludge incineration coupled coal-fired power generation system.

[0022] Embodiment 1, as Figure 1As shown in the figure, a fluidized sludge incineration coupled coal-fired power generation system includes a fluidized sludge incineration furnace 1, a high-temperature air preheater 2, a separator 3, a loop seal 4, a return pipe 5, a feed pipe 6, a flue gas connection pipe 7, and a fan system 8. The flue gas of the fluidized sludge incineration furnace 1 is connected to the separator 3. The outlet of the separator 3 is connected to the flue gas connection pipe 7. The high-temperature air preheater 2 is arranged in the flue gas connection pipe 7. The inlet of the high-temperature air preheater 2 is connected to the fan system 8. The outlet of the high-temperature air preheater 2 is connected to the gas inlet of the fluidized sludge incineration furnace 1. The loop seal 4 is arranged below the separator 3. The loop seal 4 is connected to the fluidized sludge incineration furnace 1 through the return pipe 5. The feed pipe 6 is connected to the fluidized sludge incineration furnace 1 through the return pipe 5. The return pipe 5 is arranged obliquely.

[0023] The separator is used to separate the solid particles in the flue gas coming out of the fluidized sludge incineration furnace 1, which is achieved by the centrifugal force generated by the rotating dusty gas, so that the particles are thrown towards the wall of the separator and slide down along the wall. The loop seal is used to stably transport the solid particles separated from the separator 3 back into the fluidized sludge incineration furnace 1 with a higher pressure. By establishing a certain material height to form an ash plug, it ensures that the amount of gas backflowing into the separator is minimized, and guarantees a benign and stable material flow in which the solid particles can enter the furnace again through the separator and the loop seal. The return pipe 5 is used to connect the loop seal 4 and the furnace 1 to ensure that the separated solid particles can smoothly return to the furnace to continue participating in combustion or reaction. The return pipe is provided with an inclination angle and a sufficient diameter to ensure that the material will not be blocked during transportation. At the same time, it also needs to be able to withstand high-temperature and high-pressure environments. During operation, closely monitor the operating states of the separator, the loop seal, and the return pipe to prevent blockage or wear; regularly maintain and service the separator, the loop seal, and the return pipe to ensure their normal operation and extend their service life. Adjust the fluidization air volume and the return air volume according to the actual situation to maintain the stability and efficiency of the material circulation.

[0024] The fluidized sludge incineration furnace is used for the mixed combustion of sludge and coal. It is an adiabatic furnace. The fluidized sludge incineration furnace adopts the structure of a fluidized bed incinerator. Its interior is composed of refractory materials. A wind distribution plate is arranged at the bottom to form a combustion chamber. The furnace wall is made of high-efficiency adiabatic materials to ensure the stability of the furnace temperature and reduce the influence of the external environment on the incineration process. The sludge and coal are mixed in a certain proportion and then fed into the furnace. The high moisture and high volatile components in the sludge are quickly evaporated and burned in the furnace, while the coal provides a stable heat source and fixed carbon combustion; the ignition point of the sludge is lower than that of the coal, so the ignition temperature of the mixed fuel is lower and the combustion process is more stable. The air distribution device sends air into the dense phase zone to make the bed layer in a good fluidization state. The heat transfer condition in the bed layer is good, and the temperature is uniform and stable, which is conducive to the full combustion of the sludge and coal.

[0025] The provided feed pipe feeds sludge and coal simultaneously, and the feeding point is located at the return pipe. The feed pipe is connected to the sludge pretreatment equipment. The feed pipe is responsible for transporting the pretreated sludge and coal to a designated position in the furnace, namely the return pipe. By precisely controlling the feeding amount and speed, the uniform mixing of sludge and coal is ensured. The return pipe is not only used to transport the solid particles separated by the separator back to the furnace but also serves as the feeding point for sludge and coal. Such a design can make full use of the heat and airflow in the furnace to promote the rapid ignition and stable combustion of sludge and coal. The sludge first enters the pretreatment equipment, undergoes dehydration treatment to reduce the moisture content, and then undergoes treatments such as crushing to make its particle size distribution more uniform.

[0026] The feed pipe 6 is vertically arranged, and an inclined baffle is provided at the outlet of the feed pipe 6 to prevent the fuel in the feed pipe 6 from directly impacting the inner wall of the return pipe 5. The inclined baffle changes the flow direction of the fuel from the feed pipe 6, reducing the impact and friction of the fuel on the inner wall of the return pipe 5. The vertically arranged feed pipe 6 can ensure that the fuel falls in a stable and controllable manner. This arrangement helps to reduce the accumulation and blockage of fuel in the pipe, and at the same time makes the flow of fuel smoother. The vertical arrangement also helps to utilize the gravity effect, enabling the fuel to fall naturally, reducing the dependence on the feeding equipment and energy consumption. The inclined baffle can effectively change the flow direction of the fuel from the feed pipe 6 so that it no longer directly impacts the inner wall of the return pipe 5. This design of changing the flow direction allows the fuel to be more evenly distributed across the cross-section of the return pipe 5, thereby improving the utilization rate and combustion efficiency of the fuel. Due to the presence of the inclined baffle, the fuel no longer directly impacts the inner wall of the return pipe 5 at high speed, thus greatly reducing the impact force and friction force. This reduced impact and friction not only extend the service life of the return pipe 5 but also reduce the noise and vibration during the operation of the system. By changing the flow direction and distribution of the fuel, the inclined baffle also helps to optimize the combustion process. It enables the fuel to mix more fully with the combustion-supporting air, improving the uniformity and stability of combustion. This optimized combustion process helps to reduce the generation of harmful substances, improve the combustion efficiency, and reduce the impact on the environment.

[0027] The vertical arrangement of the feed pipe 6 and the inclined baffle provided at its outlet are aimed at reducing the impact and friction of the fuel on the inner wall of the return pipe 5, improving the overall efficiency and durability of the system. It not only optimizes the flow and distribution of the fuel but also promotes the optimization of the combustion process and the improvement of environmental protection performance.

[0028] The fluidized sludge incineration furnace 1 is used for the co - combustion of sludge and coal. Its structure is an adiabatic furnace, and the furnace wall is composed of steel plates, refractory fixing devices, and refractories. The steel plate serves as the outer structure of the furnace, mainly bearing the functions of support and protection, resisting mechanical pressure and thermal stress, and protecting the refractories inside the furnace from direct erosion by the external environment. The refractory is the core component of the furnace wall. It directly withstands high - temperature flames and thermal radiation inside the furnace. The selection and performance of the refractories directly affect the service life and safety of the furnace. Generally, high - alumina bricks, aluminosilicate fibers, and mullite can be used. These materials have excellent high - temperature resistance, thermal shock resistance, and erosion resistance, and can maintain stable structures and properties in high - temperature environments. Refractories usually have a low thermal conductivity, which can reduce heat loss. At the same time, they also have good chemical stability and mechanical strength, and can maintain stable performance in harsh working environments. The refractory fixing devices are used to firmly fix the refractories on the steel plates to prevent them from falling off or shifting at high temperatures. The fixing devices may include anchor bolts, buckles, or hooks.

[0029] The feed pipe 6 connects the pulverized coal pipeline and the sludge pretreatment equipment. The coal in the feed pipe 6 comes from the fuel delivery system of the coal - fired boiler, eliminating the need to build a separate fuel crushing and screening system. The feed pipe 6 connects the pulverized coal pipeline and the sludge pretreatment equipment, enabling the efficient integration and transportation of coal and sludge. The coal in the feed pipe 6 directly originates from the fuel delivery system of the coal - fired boiler, which means there is no need to build a complex fuel crushing and screening system specifically for the sludge incineration process, reducing construction and operation costs. The coal has already undergone the necessary crushing and screening processes in the fuel delivery system of the coal - fired boiler and meets the particle size requirements suitable for combustion. When this coal enters the feed pipe 6 through the pulverized coal pipeline, it is already in an ideal combustion state and does not require additional treatment. At the same time, the sludge is dehydrated, crushed, etc. through the pretreatment equipment to ensure its effective mixing with coal and stable combustion in the furnace.

[0030] The design of the feed pipe 6 fully considers the mixing ratio and feeding speed of coal and sludge, and ensures their uniform mixing and smooth feeding into the furnace through an accurate control system. Inside the furnace, coal and sludge ignite and burn stably in an environment of high temperature and sufficient oxygen, releasing a large amount of heat energy. At the same time, the gas flow and temperature distribution inside the furnace are also optimized to further improve combustion efficiency and reduce pollutant emissions.

[0031] A coal-fired boiler SCR denitrification device is arranged in the downstream flue of the high-temperature air preheater 2, and the cooled flue gas enters the coal-fired boiler SCR denitrification device through the flue gas connecting pipe 7; the air sent by the fan system 8 is heated after passing through the high-temperature air preheater 2, and then is sent to the fluidized sludge incineration disposal furnace 1 as combustion-supporting air; the sludge incineration process is optimized by improving combustion efficiency and reducing pollutant emissions, and the waste heat in the flue gas is used to heat the air entering the incinerator. The flue gas connecting pipe 7 is used to transport the cooled flue gas from the high-temperature air preheater to the coal-fired boiler SCR denitrification device, and the fan system is used to send external air into the high-temperature air preheater for heating. The heated air is then sent into the fluidized sludge incineration disposal furnace as combustion-supporting air to improve combustion efficiency and temperature; the sludge is subjected to the action of high temperature and combustion-supporting air in the furnace, and a violent oxidation reaction occurs, releasing a large amount of heat energy and flue gas, which is then purified and discharged through the flue gas treatment system.

[0032] The sludge and coal enter the fluidized sludge incineration furnace 1, and the sand bed in the furnace is fluidized by air flow at high temperature, so that the sludge is decomposed into gas and ash in a high-temperature, oxygen-rich environment, and the coal powder is burned to provide heat energy to completely burn the waste. The sludge and coal enter the fluidized sludge incineration furnace 1 through the feeding pipe 6 and the return pipe 5 for drying and incineration. The high-temperature flue gas generated by the drying and incineration passes through the separator 3, and the larger particles in the flue gas are separated by the separator 3. The return device 4 and the return pipe 5 are returned to the fluidized sludge incineration treatment furnace 1; the high-temperature flue gas comes out of the separator 3, is cooled to 300-450°C by the high-temperature air preheater 2, and is then sent to the SCR denitrification device of the coal-fired boiler through the flue gas connecting pipe 7 for denitrification. The combustion air sent from the fan system 8 is heated to 300-500°C by the high-temperature air preheater 2, and then is sent to the fluidized sludge incineration treatment furnace 1. The system utilizes the original boiler coal feeding system and denitrification system without the need for separate construction.

[0033] Example 2, based on Example 1, an inspection port is provided at the connection between the feed pipe 6 and the return pipe 5, which helps prevent the return pipe 5 from being blocked. The provision of the inspection port enables the operator to regularly check the connection status between the feed pipe and the return pipe and the flow conditions inside the return pipe. Once it is found that the material flow is not smooth or there are signs of blockage, measures can be taken immediately to deal with it to avoid further expansion of the blockage problem. When the return pipe is blocked, the inspection port provides a convenient passage for cleaning. The operator can directly clean the blocked part through the inspection port without disassembling the entire pipeline system, thereby saving time and labor costs. The provision of the inspection port helps to ensure that the return pipe can be quickly discovered and handled when problems occur, thereby enhancing the stability of the entire production system.

[0034] Optionally, based on the above embodiments, the separator 3 in the present application can be a cyclone separator or a gravity separator. When the dust-containing gas enters the cyclone separator, the gas flow will enter the cylinder along the tangential direction, forming a rotating downward outer swirl. The dust particles in the outer swirl are thrown towards the wall of the device under the action of centrifugal force and fall along the wall into the ash discharge port. The purified gas forms an inner swirl and is discharged from the central pipe at the top, thus achieving the purpose of gas-solid separation. The cyclone separator has a simple structure and low maintenance cost; it is particularly suitable for separating particles with larger particle sizes and is resistant to high temperatures and corrosion. The gravity separator utilizes the density difference between the production medium and the separated substance to achieve the separation effect. When the mixed medium enters the gravity separator, the different components have different densities and will stratify under the action of gravity. The components with larger densities will gradually settle to the bottom of the separator, while the components with smaller densities will float on the top, thus achieving separation; the separation process does not require additional power consumption, has low energy consumption, and the separation effect is stable and reliable.

[0035] The flue gas connection pipe between the separator and the high-temperature air preheater adopts an anti-abrasion and heat-insulating structural form, which sequentially includes a pipe body, a heat-insulating layer, and a refractory and wear-resistant layer from the outside to the inside. The pipe body is made of steel plate or membrane wall structure, and a heat-insulating layer is provided outside the pipe body; the pipe body usually adopts a steel plate or membrane wall structure. The steel plate or membrane wall structure has good high-temperature resistance and mechanical strength, and can withstand the erosion and corrosion of high-temperature flue gas; the steel plate structure is simple and easy to process and install; the membrane wall structure has better sealing performance and thermal efficiency, and can reduce heat loss; the main function of the heat-insulating layer is to reduce the heat conduction of the high-temperature flue gas inside the pipe to the external environment, improve the thermal efficiency of the whole system, and protect the external structure from high-temperature damage. The refractory and wear-resistant layer can effectively resist the erosion and wear of high-temperature flue gas, reduce the direct exposure and damage of the pipe body, and thus extend the service life of the pipe.

[0036] In summary, the present utility model provides a fluidized sludge incineration coupled coal-fired power generation system, which includes a fluidized sludge incineration disposal furnace 1, a high-temperature air preheater 2, a separator 3, a return feeder 4, a return pipe 5 and a feed pipe 6; the flue gas of the fluidized sludge incineration disposal furnace 1 is connected to the separator 3, the outlet of the separator 3 is connected to a flue gas connection pipe 7, the high-temperature air preheater 2 is arranged in the flue gas connection pipe 7, the inlet of the high-temperature air preheater 2 is connected to a fan system 8, the outlet of the high-temperature air preheater 2 is connected to the gas inlet of the fluidized sludge incineration disposal furnace 1, the return feeder 4 is arranged below the separator 3, and the return feeder 4 and the feed pipe 6 are connected to the fluidized sludge incineration disposal furnace 1 through the return pipe 5. The drying heat source of this system is not high-temperature flue gas, but directly mixed with coal for combustion. The coal comes from the coal feeding of the coal-fired boiler, so there is no need to additionally set up a coal conveying system. The high-temperature flue gas at 700 - 1000 °C at the outlet of the fluidized sludge incineration disposal furnace is cooled to 300 - 450 °C through the high-temperature air preheater, and then transported to the SCR denitration device of the coal-fired boiler through a flue gas connection pipe made of carbon steel for denitration treatment. The sludge and coal feed ports of the fluidized sludge incineration disposal furnace are arranged on the return pipe below the separator located on the front wall, without the need to separately open holes on the furnace, and at the same time, the blockage in the feed pipe can be reduced. The average calorific value after mixing the sludge and coal is 3.2 - 5 MJ / kg, which can reduce the coal consumption.

[0037] The above content is only to illustrate the technical idea of the present utility model, and the protection scope of the present utility model cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present utility model falls within the protection scope of the claims of the present utility model.

Claims

1. A fluidized sludge incineration coupled coal-fired power generation system, characterized in that, It includes a fluidized sludge incineration furnace (1), a high-temperature air preheater (2), a separator (3), a return feeder (4), a return pipe (5), and a feed pipe (6); the flue gas of the fluidized sludge incineration furnace (1) is connected to the separator (3), the outlet of the separator (3) is connected to a flue gas connection pipe (7), the high-temperature air preheater (2) is arranged in the flue gas connection pipe (7), the inlet of the high-temperature air preheater (2) is connected to a fan system (8), the outlet of the high-temperature air preheater (2) is connected to the gas inlet of the fluidized sludge incineration furnace (1), a return feeder (4) is arranged below the separator (3), and the return feeder (4) and the feed pipe (6) are connected to the fluidized sludge incineration furnace (1) through the return pipe (5).

2. The fluidized sludge incineration coupled coal-fired power generation system according to claim 1, wherein The return pipe (5) is arranged obliquely, the feed pipe (6) is arranged vertically, and an inclined baffle is arranged at the outlet of the feed pipe (6) to prevent the fuel in the feed pipe (6) from directly impacting the inner wall of the return pipe (5).

3. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, wherein The arranged feed pipe (6) feeds sludge and coal at the same time, the feeding point is located in the return pipe (5), and the feed pipe (6) is connected to a sludge pretreatment device.

4. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that The feed pipe (6) is connected to the fuel conveying system of a coal-fired boiler.

5. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, The fluidized sludge incineration furnace (1) is used for the mixed combustion of sludge and coal and is an adiabatic furnace.

6. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, The working temperature range of the material used for the high-temperature air preheater (2) is 700 - 1000 °C, and the flue gas connection pipe (7) is made of carbon steel.

7. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, The flue gas connection pipe (7) between the separator (3) and the high-temperature air preheater (2) adopts an abrasion-proof and heat-insulating structural form, which sequentially includes a pipe body, a heat-insulating layer, and a refractory and wear-resistant layer from the outside to the inside. The pipe body adopts a steel plate or a membrane wall structure, and a heat-insulating layer is arranged outside the pipe body.

8. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, The separator (3) is located on the front wall of the fluidized sludge incineration furnace.

9. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, The separator (3) is a cyclone separator or a gravity separator.

10. A fluidized sludge incineration coupled coal-fired power generation system according to claim 1, characterized in that, A coal-fired boiler SCR denitration device is arranged in the downstream flue of the high-temperature air preheater (2), and the cooled flue gas enters the coal-fired boiler SCR denitration device through the flue gas connection pipe (7).

Images