Solid waste incineration power generation device and process thereof

Abstract

The invention provides a solid waste incineration power generation device and technology, and belongs to the technical field of solid waste treatment, the device comprises a fuel regeneration treatment unit, a solid waste incineration power generation unit and a flue gas treatment unit which are connected in sequence; the solid waste incineration power generation unit comprises a solid waste incineration boiler, a separator, a first flue, a second flue, a third flue, a return feeder and a steam turbine generator which are connected in sequence; a hearth, a separator, a first flue, a second flue, a third flue and a return feeder of the solid waste incineration boiler are all of a water cooling wall structure. A first-stage superheater and a first convection bank are arranged in the second flue, a second-stage superheater and a second convection bank are arranged in the third flue, and a third-stage superheater is arranged in the return feeder. According to the process, solid waste materials to be treated are treated into boiler fuel in a fuel regeneration treatment unit; boiler fuel enters the solid waste incineration boiler to be combusted for power generation. According to the invention, resource cyclic comprehensive utilization can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment, and in particular relates to a solid waste incineration power generation device and a process thereof. Background Art

[0002] The papermaking process produces a large amount of solid fuels such as solid industrial waste with medium calorific value, pulp residue, sludge, and difficult-to-handle entangled materials. The existing solid waste treatment methods mainly include landfill and incineration. The landfill method makes it difficult to utilize the effective components in the solid waste and the degradation time is also long. The incineration method has the disadvantages of incomplete combustion and low calorific value utilization. Summary of the invention

[0003] In order to solve the above problems of the prior art, the present invention provides a solid waste incineration power generation device and a process thereof, which uses solid industrial solid waste, slurry residue, and sludge with medium calorific value as fuel, and mixes and burns a small amount of molded biomass fuel and other general industrial solid waste, and processes the industrial solid waste to regenerate it into renewable energy that can meet the incineration of solid waste boilers. The regenerated fuel is transported to a circulating fluidized bed boiler for incineration, and the generated high-temperature and high-pressure steam enters a steam turbine generator set to generate electricity. The residual ash produced by incineration is mainly used as building materials, thereby realizing resource recycling.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A solid waste incineration power generation device, comprising:

[0006] A fuel regeneration processing unit, a solid waste incineration power generation unit and a flue gas treatment unit connected in sequence;

[0007] The solid waste incineration power generation unit comprises a solid waste incineration boiler, a separator, a first flue, a second flue, a third flue, a returner and a steam turbine generator connected in sequence; the furnace, the separator, the first flue, the second flue, the third flue and the returner of the solid waste incineration boiler all adopt a water-cooled wall structure;

[0008] A primary superheater and a first convection tube bundle are arranged in the second flue, a secondary superheater and a second convection tube bundle are arranged in the third flue, and a tertiary superheater is arranged in the return feeder;

[0009] When in use, the solid waste materials to be processed are processed into boiler fuel in the fuel regeneration processing unit; the boiler fuel enters the solid waste incineration boiler for combustion, generating boiler flue gas and superheated steam, the boiler flue gas and superheated steam are separated by a separator, the boiler flue gas enters the first flue, is cooled to a preset first temperature by the water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence;

[0010] The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity.

[0011] Furthermore, the fuel regeneration processing unit includes a solid waste material processing line, a pulp and slag material processing line and a sludge material processing line, which are used to process solid waste, pulp and sludge respectively.

[0012] Furthermore, the solid waste material processing line includes a winding material processing line, a non-winding material processing line and a mixed processing line. The winding material processing line and the non-winding material processing line are connected in parallel and are both connected to the mixed processing line; the winding material processing line includes a first vibrating feeder, a first magnetic separation device, and a first crushing device connected in sequence; the non-winding material processing line includes a second crushing device and a second magnetic separation device connected in sequence; the mixed processing line includes a mixing device, a second vibrating feeder, and a sorting device connected in sequence; the first crushing device and the second magnetic separation device are both connected to the mixing device.

[0013] Furthermore, the pulp and slag material processing line and the sludge material processing line both include an extruder, a magnetic separator, a drying and airing unit connected in sequence.

[0014] Furthermore, the fuel regeneration processing unit also includes a ventilation and exhaust system, which is arranged at the location of the solid waste material processing line, the slurry material processing line and the sludge material processing line.

[0015] Furthermore, the fuel regeneration processing unit also includes a fuel delivery system, and the fuel delivery system is respectively connected to the solid waste material processing line, the slurry material processing line and the sludge material processing line.

[0016] Furthermore, the fuel delivery system includes a pipe belt conveyor and a sidewall belt conveyor connected in sequence.

[0017] Furthermore, the flue gas treatment unit includes a selective non-catalytic reduction system, a dust collector and a desulfurization and denitrification system, the dust collector includes an electrostatic precipitator, a primary bag dust collector, and a secondary bag dust collector; the desulfurization and denitrification system includes a semi-dry reaction tower, a dry reaction tower, a flue gas desulfurization system, and a denitrification tower; the selective non-catalytic reduction system, the electrostatic precipitator, the semi-dry reaction tower, the dry reaction tower, the primary bag dust collector, the secondary bag dust collector, the flue gas desulfurization system, and the denitrification tower are connected in sequence, and calcium hydroxide powder, sodium carbonate powder and activated carbon particles are sprayed in the dry reaction tower.

[0018] Furthermore, the solid waste incineration power generation device also includes a slag utilization unit, which screens the slag according to particle size, and the slag smaller than the preset particle size is returned to the solid waste incineration power generation unit for combustion, and the slag exceeding the preset particle size is used as raw material for processing building materials.

[0019] A solid waste incineration power generation process, comprising:

[0020] Step S1: crushing, screening, mixing, and extruding solid waste, pulp residue, and sludge to process them into boiler fuel;

[0021] Step S2: The boiler fuel enters the solid waste incineration boiler for combustion. During combustion, the furnace temperature range is usually controlled at 850-900°C, and the flue gas stays in the furnace for more than 2 seconds when the temperature reaches above 850°C.

[0022] Combustion generates boiler flue gas and superheated steam, which are separated by a separator. The boiler flue gas enters the first flue and is cooled to a preset first temperature by a water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence;

[0023] The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater, and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity.

[0024] Step S3: the boiler flue gas coming out of the return device enters the flue gas treatment unit, and is discharged into the atmosphere after being purified through the flue gas treatment process of selective non-catalytic reduction + electrostatic precipitator + semi-dry reaction of calcium hydroxide solution + primary calcium hydroxide powder dry method + primary bag dust removal + secondary calcium hydroxide powder dry method + sodium carbonate powder dry method + activated carbon injection adsorption + secondary bag dust removal + steam-flue gas reheating + ammonia desulfurization and denitrification + fly ash chelation and solidification.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention is provided with a multi-stage flue, all of which are water-cooled wall structures, wherein the first flue is an empty flue, which can control the flue gas temperature entering the convection heating surface, reduce dust accumulation and corrosion, and also reduce the secondary synthesis of dioxins;

[0027] 2. The flue gas first flows from top to bottom through the first flue composed of water-cooled walls, and then enters the second and third flues arranged with the first and second superheaters and convection tube bundles. The second and third flues are convection flues, which can fully exchange heat and improve the utilization rate of thermal energy;

[0028] 3. The "three-stage superheater" is set in the return feeder, which is effectively isolated from the flue gas flow in the furnace and separator. The corrosiveness of the gas in the return feeder is greatly reduced compared with that in the furnace and flue. The multi-layer tube superheater design for solid waste avoids the condensation corrosion of alkali metal chlorides and greatly extends the life of the superheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a solid waste incineration power generation device according to an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a solid waste incineration power generation process according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a fuel regeneration processing unit according to an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a fuel delivery system according to an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of a solid waste incineration power generation unit according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of a flue gas treatment process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0039] In order to better understand the purpose, structure and function of the present invention, a detailed description is given below in conjunction with the accompanying drawings.

[0040] Example 1

[0041] like Figure 1-Figure 5 As shown, this embodiment provides a solid waste incineration power generation device, comprising:

[0042] A fuel regeneration processing unit, a solid waste incineration power generation unit and a flue gas treatment unit connected in sequence;

[0043] The solid waste incineration power generation unit comprises a solid waste incineration boiler, a separator, a first flue, a second flue, a third flue, a returner and a steam turbine generator connected in sequence; the furnace, the separator, the first flue, the second flue, the third flue and the returner of the solid waste incineration boiler all adopt a water-cooled wall structure;

[0044] The first-stage superheater and the first convection tube bundle are arranged in the second flue, the second-stage superheater and the second convection tube bundle are arranged in the third flue, and the third-stage superheater is arranged in the return feeder;

[0045] When in use, the solid waste materials to be processed are processed into boiler fuel in the fuel regeneration processing unit; the boiler fuel enters the solid waste incineration boiler for combustion, generating boiler flue gas and superheated steam, the boiler flue gas and superheated steam are separated by a separator, the boiler flue gas enters the first flue, is cooled to a preset first temperature by the water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence;

[0046] The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity.

[0047] Furthermore, the fuel regeneration processing unit mainly processes solid industrial solid waste with medium calorific value, pulp residue, sludge, and entangled industrial solid waste that is difficult to process;

[0048] The fuel regeneration processing unit comprises a solid waste material processing line, a pulp residue material processing line and a sludge material processing line, which are used for processing solid waste, pulp residue and sludge respectively.

[0049] Furthermore, the solid waste material processing line includes a winding material processing line, a non-winding material processing line and a mixed processing line. The winding material processing line and the non-winding material processing line are connected in parallel and are both connected to the mixed processing line; the winding material processing line includes a first vibrating feeder, a first magnetic separation device, and a first crushing device connected in sequence; the non-winding material processing line includes a second crushing device and a second magnetic separation device connected in sequence; the mixed processing line includes a mixing device, a second vibrating feeder, and a sorting device connected in sequence; the first crushing device and the second magnetic separation device are both connected to the mixing device.

[0050] Furthermore, the pulp and slag material processing line and the sludge material processing line both include an extruder, a magnetic separator, a drying and airing unit connected in sequence.

[0051] Furthermore, the fuel regeneration processing unit also includes a ventilation and exhaust system, which is arranged at the location of the solid waste material processing line, the slurry material processing line and the sludge material processing line.

[0052] Furthermore, the fuel regeneration processing unit also includes a fuel delivery system, and the fuel delivery system is respectively connected to the solid waste material processing line, the slurry material processing line and the sludge material processing line.

[0053] Furthermore, the fuel delivery system includes a pipe belt conveyor and a sidewall belt conveyor connected in sequence.

[0054] Furthermore, the flue gas treatment unit includes a selective non-catalytic reduction system, a dust collector and a desulfurization and denitrification system, the dust collector includes an electrostatic precipitator, a primary bag dust collector, and a secondary bag dust collector; the desulfurization and denitrification system includes a semi-dry reaction tower, a dry reaction tower, a flue gas desulfurization system, and a denitrification tower; the selective non-catalytic reduction system, the electrostatic precipitator, the semi-dry reaction tower, the dry reaction tower, the primary bag dust collector, the secondary bag dust collector, the flue gas desulfurization system, and the denitrification tower are connected in sequence, and calcium hydroxide powder, sodium carbonate powder and activated carbon particles are sprayed in the dry reaction tower.

[0055] Furthermore, the solid waste incineration power generation device also includes a slag utilization unit, which screens the slag according to particle size, and the slag smaller than the preset particle size is returned to the solid waste incineration power generation unit for combustion, and the slag exceeding the preset particle size is used as raw material for processing building materials.

[0056] Example 2

[0057] like Figure 2 As shown, this embodiment provides a solid waste incineration power generation process, including:

[0058] Step S1: crushing, screening, mixing, and extruding solid waste, pulp residue, and sludge to process them into boiler fuel;

[0059] Step S2: The boiler fuel enters the solid waste incineration boiler for combustion. During combustion, the furnace temperature range is usually controlled at 850-900°C, and the flue gas stays in the furnace for more than 2 seconds when the temperature reaches above 850°C.

[0060] Combustion generates boiler flue gas and superheated steam, which are separated by a separator. The boiler flue gas enters the first flue and is cooled to a preset first temperature by a water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence;

[0061] The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater, and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity.

[0062] Step S3: the boiler flue gas coming out of the return device enters the flue gas treatment unit, and is discharged into the atmosphere after being purified through the flue gas treatment process of selective non-catalytic reduction + electrostatic precipitator + semi-dry reaction of calcium hydroxide solution + primary calcium hydroxide powder dry method + primary bag dust removal + secondary calcium hydroxide powder dry method + sodium carbonate powder dry method + activated carbon injection adsorption + secondary bag dust removal + steam-flue gas reheating + ammonia desulfurization and denitrification + fly ash chelation and solidification.

[0063] Example 3

[0064] The difference from Example 1 is that in this embodiment, when the fuel regeneration processing unit processes solid waste, sludge, and slurry, the following points are noted:

[0065] (1) Figure 3 The energy recycling process of medium calorific value solid industrial waste is shown as follows: fully sealed dump trucks are used to transport solid waste from the production area to the incoming material bin of the fuel energy recycling workshop. The energy recycling workshop is equipped with an incoming material storage area, a medium calorific value solid industrial waste processing line, and a finished material storage area. The general industrial solid waste processing line is composed of a vibrating feeder, a belt conveyor, a magnetic separator coarse crusher, a vibrating screen, a fine crusher, a non-magnetic metal separator, a screw conveyor, an optical separator, and other recycling processing lines. The more difficult-to-process entangled materials in the medium calorific value solid industrial waste are pre-treated by a coarse crusher, a magnetic separator, a fine crusher, and a magnetic separator. After the two types of solid waste are mixed, they are thoroughly separated from the metals (iron-based metals and non-ferrous metals) and non-metallic non-combustible materials (mainly soil blocks, bricks, etc.) in the solid waste after the debris is sorted out. Most of the solid waste after the debris is sorted out becomes fuel that can meet the combustion of the solid waste circulating fluidized bed boiler and is transported to the finished material storage area for stacking. The moisture content of the raw materials of medium calorific value solid industrial waste is about 50%, so no dust will be generated during the unloading process; at the same time, the entire medium calorific value solid industrial waste treatment line is a fully enclosed system, and the transport belt adopts a fully enclosed system, so no dust will be generated during the treatment process.

[0066] (2) Slurry residue and sludge regeneration process: Slurry residue and sludge are transported into the workshop by special vehicles and directly unloaded into the slurry residue bin and sludge bin respectively. Both the slurry residue bin and the sludge bin adopt a semi-underground closed structure. Slurry residue and sludge are processed by extrusion, drying, magnetic separation and other processes to become materials that can be burned in solid waste boilers.

[0067] (3) The sludge bin, slurry bin, transfer station, fuel delivery trestle and other parts of the energy regeneration workshop are equipped with ventilation and exhaust systems to reduce and treat odor. The exhaust gas is introduced into the inlet of the primary and secondary fans of the boiler through the air duct suction port and enters the boiler for incineration. The remaining exhaust gas is introduced into the odor scrubber through the air duct suction port of the odor scrubber and treated before being discharged in compliance with the emission standards.

[0068] (4) The material regeneration process ensures appropriate moisture content and reduces dust generation.

[0069] (5) Automatic material taking device for grabbing bucket in incoming material bin improves safety and reduces personnel costs;

[0070] (6) The finished product bin takes out materials automatically with the spiral feeding screw, which improves the continuity;

[0071] (7) The entire system is controlled by DCS, which basically implements unmanned operation and automatic processing procedures.

[0072] Example 4

[0073] The difference from Example 1 and Example 2 is that Figure 4 As shown in the figure, the fuel transportation system adopts pipe-belt conveyor, which completely solves the transportation difficulties such as large fuel type variation, low fuel density, and serious fuel dust. Solid industrial waste, pulp residue and sludge with medium calorific value are stored after separation and crushing, and are sent to the 45-meter layer of the boiler through three pipe-belt conveyors after classification or mixing.

[0074] This embodiment solves the transportation difficulties under the condition of complex fuel types, and ensures continuous and stable fuel transportation; solves the difficulty of continuous high-lift transportation of low-density fuel; the whole process is transported by a belt conveyor, which completely solves the dust problem of solid waste transportation; the whole process is DCS controlled, and unmanned operation and automatic transportation process are realized on site.

[0075] Example 5

[0076] The difference from Example 1 is that Figure 5 As shown, this embodiment fully considers the characteristics of solid waste fuel, selects a circulating fluidized bed boiler with higher efficiency, and adapts the feeding setting, combustion method and pollutant control.

[0077] Among them, circulating fluidized bed boilers have many advantages in boiler selection and adaptation, boiler feeding, combustion process, and NO x In terms of nitrogen oxide control, dioxin and heavy metal control at the boiler outlet, process optimization has been carried out, as follows:

[0078] (1) Boiler adaptation selection:

[0079] a. Use external superheater. The boiler furnace, separator, return feeder and the connections between them are all water-cooled wall structures, and the flue gas side is covered with light refractory castables. After the cyclone separator, an empty flue (radiation heating surface) composed of water-cooled walls is first set up. After the flue gas temperature drops to about 600°C, it enters the superheater channel (also composed of water-cooled walls). The empty flue is mainly set up to control the flue gas temperature entering the convection heating surface and reduce ash accumulation and corrosion. At the same time, it will also reduce the secondary synthesis of dioxins.

[0080] b. The flue gas first flows from top to bottom through the empty flue composed of water-cooled walls, and then enters the convection flue arranged with the first and second stage superheaters and convection tube bundles, which is also composed of water-cooled walls.

[0081] c. The "three-stage superheater" is set in the return feeder, which is effectively isolated from the flue gas flow in the furnace and cyclone separator. The corrosiveness of the gas in the return feeder is greatly reduced compared with that in the furnace and flue. The multi-layer tube superheater design for solid waste avoids the condensation corrosion of alkali metal chlorides and greatly extends the life of the superheater.

[0082] (2) Boiler feeding and slag discharge system: The solid waste incineration boiler system is equipped with a medium calorific value solid industrial waste feeding system. The fuel is evenly distributed in the bin through a rotating distribution system. The fuel is evenly fed into the furnace and burned stably through a rotating screw feeder, a quantitative feeder, a rotating air lock, and a fuel chute.

[0083] Slag discharge system: After the boiler slag is cooled by the spiral slag cooler, it is sent to the screening system to screen out the fine-grained bed material and return to the furnace to supplement the bed material loss caused by slag discharge, effectively solving the rational level matching of the furnace bed material. Since the bottom of the furnace is fully equipped with directional air hoods, heavy non-combustibles are not easy to accumulate in the slag discharge port with the same width as the furnace, and large-sized non-combustibles are easy to discharge. The slag discharge and slag cooling equipment are all designed with redundancy, which greatly improves the reliability of the boiler.

[0084] (3) Combustion process: The boiler combustion system adopts 3T+E process. The furnace temperature range is usually controlled at 850-900℃, and within the design load range, the flue gas temperature reaches above 850℃ for more than 2S. Maintain sufficient gas-solid turbulence and fully decompose harmful gases, so that the original concentration of CO and other incomplete combustion products is greatly reduced. The main measures taken include:

[0085] a. Since the efficient cyclone separator separates most of the bed materials from the flue gas and returns them to the furnace through the return device, there is a large amount of circulating materials, and the temperature field of the entire furnace is in a very uniform state;

[0086] b. Due to the presence of a large amount of fluidized bed material, even if the fuel properties change within a certain range, it will not have an adverse effect on combustion. Therefore, the furnace temperature fluctuates slightly and gently;

[0087] c. Different types of fuels with different properties have separate buffer and feeding systems in front of the furnace, which makes it easy to adjust and control the furnace temperature and requires a short response time;

[0088] d. Install a heater and flue gas air preheater so that the combustion air entering the furnace can reach a higher temperature, and the target temperature is adjustable and controllable. Especially under the condition of low fuel calorific value, this measure can still help maintain the furnace temperature within a reasonable range.

[0089] (4) NO at boiler outlet x Control concentration and control measures: The NO concentration of this boiler within the design fuel and load range is x The guaranteed value of original emission concentration is 120-150mg / Nm 3 , the actual operation is about 80-120mg / Nm 3 , the efficiency of SNCR is 50-70%. NO x The emission concentration is related to many factors:

[0090] a. Appropriate combustion temperature, excess air and air distribution as well as SNCR settings in the furnace;

[0091] b. Also due to the large amount and efficient material circulation, the fuel, bed material and combustion air can be mixed vigorously, the temperature field distribution in the entire combustion area is very uniform, and there is no local excessively high temperature combustion area. x The production volume is very low;

[0092] c. A lower excess air coefficient and a better ratio of primary and secondary air (staged air supply, with fine adjustment of air supply form and position) were adopted to further reduce NO x The original production volume;

[0093] d. Multi-stage SNCR nozzles are set at the furnace outlet and in the lower middle part of the furnace. Different injection positions and injection amounts are selected according to different bed temperatures, working conditions, reducing agent types, etc. to achieve efficient denitrification efficiency in the furnace.

[0094] (5) Dioxin and heavy metal control concentration and control measures at the boiler outlet: The control of dioxins and heavy metals in solid waste incineration boilers is particularly important. Their emission control involves a series of control measures and is a systematic project. The control measures for this process are as follows:

[0095] a. First of all, efficient and sufficient combustion of the boiler system is the most effective way to control the source of dioxins, namely "3T+E" control, to ensure a sufficiently high flue gas temperature (Temperature) in the furnace, sufficient residence time of the flue gas in the combustion chamber (Time), appropriate combustion turbulence (Turbulence), and appropriate excess air (Excess Air). The combustion process generally controls the furnace temperature to be no less than 850℃, the residence time of the flue gas in the furnace to be greater than 2s, and the air volume, temperature and injection position of the combustion air are reasonably controlled. The temperature field inside the furnace is very uniform, no combustion dead zone is generated, and the mixed fuel is ensured to be fully burned.

[0096] b. Process control of the feeding system of solid waste fuel. Due to the characteristics of fluidized bed combustion, the feeding system is extremely important for the stable operation of fluidized bed boilers. Only when the feeding system can achieve quantitative, continuous and controllable feeding can the combustion process in the furnace remain stable. Otherwise, it will cause a large fluctuation in the amount of fuel in a short period of time, resulting in local oxygen-deficient combustion and the generation of a large amount of carbon monoxide, dioxins and their precursors.

[0097] c. Through the design of efficient tail heat exchange surface, the flue gas can quickly pass through the dioxin resynthesis temperature window of 600℃-250℃, thus reducing the amount of dioxin resynthesis as much as possible.

[0098] d. Moreover, auxiliary agents can be injected into the furnace to further reduce dioxin emissions.

[0099] (6) Heavy metal emission control:

[0100] a. The materials inside the furnace are mixed evenly and burned fully. There is no local high-temperature area, and heavy metals are more likely to form salts or sulfides with better stability and lower volatility. To a certain extent, the pollution and toxicity of heavy metals are reduced;

[0101] b. Further reduce heavy metal emissions by spraying auxiliary agents inside the furnace.

[0102] Example 6

[0103] The difference from Example 1 and Example 2 is that the present embodiment is set according to the ultra-low emission standard, that is, the emission concentrations of pollutants such as dust, sulfur dioxide and nitrogen oxides are not more than 5 mg / m 3 , 35mg / m 3 , 50mg / m 3 .

[0104] This embodiment sets up two-stage bag dust collection. The fly ash of the first-stage bag dust collector is identified as general solid waste after the "Fly Ash Hazard Characteristics Identification Report". It does not have hazardous characteristics and does not belong to hazardous waste. It can be effectively used as a building material resource. The second-stage bag is set after the first-stage bag dust collector, which greatly reduces the fly ash entering the second-stage bag dust collector and greatly reduces the amount and treatment cost of the second-stage bag hazardous waste fly ash sprayed with activated carbon (used to capture dioxins, heavy metals, etc.);

[0105] like Figure 6 As shown, this embodiment uses flue gas desulfurization system (GGH, SGH) and other equipment, and uses flue gas waste heat and steam heating to heat the flue gas temperature to about 220°C for denitration reaction. Compared with high-temperature SCR (320°C-420°C), it has the advantages of low reaction temperature and low energy consumption. The flue gas desulfurization system is placed at the rear end of the secondary bag filter to reduce catalyst poisoning caused by dust and substances in the flue gas, and extend the service life of the catalyst.

[0106] In this embodiment, the denitration efficiency of SNCR is about 55%, and the denitration efficiency of SCR is about 75%. The combined denitration efficiency of the two is above 88%, which greatly reduces the amount of ammonia water used and reduces ammonia escape to below 3ppm, greatly reducing the corrosion of ammonia escape on the boiler tail flue and the rear dust removal equipment, and extending the service life of the equipment;

[0107] This embodiment sets an ultra-low emission standard, which can reduce the content of pollutants in the exhaust gas, thereby reducing the pollution of the exhaust gas to the air, water and land, and helping to improve the environment and maintain the ecological balance.

[0108] This embodiment optimizes production processes and management and improves energy efficiency and economic benefits by implementing ultra-low emission technology.

[0109] 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 are included in the protection scope of the present invention.

Claims

1. A solid waste incineration power generation device, It is characterized in that include: A fuel regeneration processing unit, a solid waste incineration power generation unit and a flue gas treatment unit connected in sequence; The solid waste incineration power generation unit comprises a solid waste incineration boiler, a separator, a first flue, a second flue, a third flue, a returner and a steam turbine generator connected in sequence; the furnace, the separator, the first flue, the second flue, the third flue and the returner of the solid waste incineration boiler all adopt a water-cooled wall structure; A primary superheater and a first convection tube bundle are arranged in the second flue, a secondary superheater and a second convection tube bundle are arranged in the third flue, and a tertiary superheater is arranged in the return feeder; When in use, the solid waste materials to be processed are processed into boiler fuel in the fuel regeneration processing unit; the boiler fuel enters the solid waste incineration boiler for combustion, generating boiler flue gas and superheated steam, the boiler flue gas and superheated steam are separated by a separator, the boiler flue gas enters the first flue, is cooled to a preset first temperature by the water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence; The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity.

2. The solid waste incineration power generation device according to claim 1, It is characterized in that The fuel regeneration processing unit comprises a solid waste material processing line, a pulp residue material processing line and a sludge material processing line, which are used for processing solid waste, pulp residue and sludge respectively.

3. The solid waste incineration power generation device according to claim 2, It is characterized in that The solid waste material processing line includes a winding material processing line, a non-winding material processing line and a mixed processing line. The winding material processing line and the non-winding material processing line are connected in parallel and are both connected to the mixed processing line; the winding material processing line includes a first vibrating feeder, a first magnetic separation device, and a first crushing device connected in sequence; the non-winding material processing line includes a second crushing device and a second magnetic separation device connected in sequence; the mixed processing line includes a mixing device, a second vibrating feeder, and a sorting device connected in sequence; the first crushing device and the second magnetic separation device are both connected to the mixing device.

4. The solid waste incineration power generation device according to claim 3, It is characterized in that The pulp and slag material processing line and the sludge material processing line both include an extruder, a magnetic separator, a drying and airing unit connected in sequence.

5. The solid waste incineration power generation device according to claim 2, It is characterized in that The fuel regeneration processing unit also includes a ventilation and exhaust system, which is arranged at the location of the solid waste material processing line, the slurry and slag material processing line and the sludge material processing line.

6. The solid waste incineration power generation device according to claim 2, It is characterized in that The fuel regeneration processing unit also includes a fuel delivery system, which is respectively connected to the solid waste material processing line, the slurry material processing line and the sludge material processing line.

7. The solid waste incineration power generation device according to claim 6, It is characterized in that The fuel delivery system comprises a pipe belt conveyor and a sidewall belt conveyor which are connected in sequence.

8. The solid waste incineration power generation device according to claim 1, It is characterized in that The flue gas treatment unit includes a selective non-catalytic reduction system, a dust collector and a desulfurization and denitrification system. The dust collector includes an electrostatic precipitator, a primary bag dust collector and a secondary bag dust collector. The desulfurization and denitrification system includes a semi-dry reaction tower, a dry reaction tower, a flue gas desulfurization system and a denitrification tower. The selective non-catalytic reduction system, the electrostatic precipitator, the semi-dry reaction tower, the dry reaction tower, the primary bag dust collector, the secondary bag dust collector, the flue gas desulfurization system and the denitrification tower are connected in sequence, and calcium hydroxide powder, sodium carbonate powder and activated carbon particles are sprayed in the dry reaction tower.

9. The solid waste incineration power generation device according to claim 1, It is characterized in that The solid waste incineration power generation device also includes a slag utilization unit, which screens the slag according to the particle size. The slag smaller than the preset particle size is returned to the solid waste incineration power generation unit for combustion, and the slag larger than the preset particle size is used as raw material for processing building materials.

10. A solid waste incineration power generation process, using the solid waste incineration power generation device as described in any one of claims 1 to 9 to perform incineration power generation, comprising the following steps: Step S1: crushing, screening, mixing, and extruding solid waste, pulp residue, and sludge to process them into boiler fuel; Step S2: The boiler fuel enters the solid waste incineration boiler for combustion. During combustion, the furnace temperature range is usually controlled at 850-900°C, and the flue gas stays in the furnace for more than 2 seconds when the temperature reaches above 850°C. Combustion generates boiler flue gas and superheated steam, which are separated by a separator. The boiler flue gas enters the first flue and is cooled to a preset first temperature by a water-cooled wall, and then enters the second flue, the third flue, and the return device in sequence; The superheated steam enters the steam turbine generator through the separator, the first stage superheater, the second stage superheater, and the third stage superheater in sequence. The superheated steam expands and does work to drive the steam turbine generator to generate electricity. Step S3: the boiler flue gas coming out of the return device enters the flue gas treatment unit, and is discharged into the atmosphere after being purified through the flue gas treatment process of selective non-catalytic reduction + electrostatic precipitator + semi-dry reaction of calcium hydroxide solution + primary calcium hydroxide powder dry method + primary bag dust removal + secondary calcium hydroxide powder dry method + sodium carbonate powder dry method + activated carbon injection adsorption + secondary bag dust removal + steam-flue gas reheating + ammonia desulfurization and denitrification + fly ash chelation and solidification.

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