A solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering

Abstract

This invention discloses a self-sustaining smoldering combustion-based coupled reaction system for solid waste treatment and scouring, relating to the field of organic solid waste treatment. In this system, after treatment, the organic solid waste undergoes a smoldering reaction in a smoldering reaction unit via ignition. A heat storage unit collects the heat energy generated by the smoldering reaction and supplies it to a scouring reaction unit. The scouring reaction unit preheats the scouring liquid based on the heat energy and then sprays the scouring liquid onto cotton textiles for scouring. The ignition energy required for the smoldering reaction is less than 5.0 kW / m³. 2 The energy produced by the smoldering reaction of solid waste per unit volume is less than 1 / 8 of that produced by open flame ignition. 3 The energy required to carry out a boiling reaction is 10 MJ / m³, which is obtained by removing 2 units of solid waste. 3 This invention utilizes the heat generated from the smoldering pyrolysis and oxidation of organic solid waste to preheat the cooking liquid and promote the cooking reaction, thereby realizing the treatment and utilization of organic solid waste.

Description

Technical Field

[0001] This invention relates to the field of organic solid waste treatment, and in particular to a solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering combustion. Background Technology

[0002] Currently, the most widely used organic solid waste treatment technology in the world is thermochemical treatment, which uses methods such as incineration, pyrolysis, gasification, and hydrolysis to destroy toxic and harmful substances while maximizing volume reduction and minimizing the formation of new pollutants. Incineration, the most commonly used method, requires organic solid waste to have a relatively high calorific value; however, the combustion temperature is difficult to control, and the energy input required is also high. Therefore, there is an urgent need for a low-energy-consumption method to treat organic solid waste.

[0003] Smoldering is a slow, low-temperature, and flameless combustion reaction driven by a heterogeneous, exothermic oxidation reaction between oxygen and the surface of solid fuel. Unlike open flame combustion, smoldering has a lower combustion temperature (250-800℃) and can be sustained under extreme conditions (such as low oxygen content, high fuel moisture content, and low trigger energy). A 2016 research paper by Huang Xinyan et al. showed that carbon-based solid waste can still undergo stable smoldering even with oxygen concentrations as low as 12%. A 2018 research paper by Yellman et al. demonstrated that peat with a moisture content as high as 70% can achieve self-sustaining smoldering. A 2020 research paper by Raman et al. showed that the triggering of self-sustaining smoldering in sludge requires only a low energy input of 1.6 MJ / kg. Furthermore, compared to traditional methods, smoldering offers advantages such as lower treatment costs, simpler operation, higher safety, and a faster and more convenient process. Pollutants generated during smoldering, such as carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen oxides (NOx), and particulate matter (PM), can be effectively controlled through flue gas purification technology. Simultaneously, the smoldering process generates continuous and stable heat, which can, to some extent, meet the requirements of specific low-energy-input processes. Scouring is a key step in the pretreatment of cotton fabrics; the input of continuous and stable heat energy can remove byproducts, cottonseed hulls, and residual sizing material from the cotton fibers, resulting in good wettability and appearance for the cotton fabric. Summary of the Invention

[0004] The purpose of this invention is to provide a solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering, which uses the heat energy generated by the smoldering reaction of low-energy-input organic solid waste for the scouring reaction, thereby realizing the treatment and utilization of organic solid waste.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering combustion includes a raw material processing unit, a smoldering reaction unit, a heat storage unit, and a scouring reaction unit connected in sequence. Organic solid waste is stored in the raw material processing unit, and scouring liquid and cotton textiles are stored in the scouring reaction unit respectively.

[0007] The raw material processing unit obtains smoldering raw material by processing the organic solid waste, and then transports the smoldering raw material to the smoldering reaction unit.

[0008] The smoldering reaction unit heats the smoldering raw material, and the smoldering raw material undergoes a smoldering reaction to generate heat energy;

[0009] The thermal storage unit stores the thermal energy;

[0010] The scouring reaction unit preheats the scouring liquid with thermal energy and sprays the scouring liquid onto the cotton fabric; the cotton fabric and the scouring liquid undergo a scouring reaction based on the thermal energy.

[0011] Optionally, the raw material processing unit includes a material storage bin, a crushing and grinding bin, and a material mixing bin connected in sequence;

[0012] The material storage bin is used to store the organic solid waste;

[0013] The crushing and grinding chamber uses a crushing and grinding device to pulverize the organic solid waste;

[0014] The material mixing chamber is connected to the smoldering reaction unit. The material mixing chamber uses a stirrer to uniformly mix the crushed organic solid waste with the combustion aid to obtain the smoldering raw material, and then transports the smoldering raw material to the smoldering reaction unit.

[0015] Optionally, the smoldering reaction unit further includes:

[0016] Heating wire, used to heat the smoldering raw material;

[0017] The smoldering generator has a heating wire at its bottom, which is connected to the raw material processing unit; the smoldering raw material undergoes a smoldering reaction in the smoldering generator to generate heat energy.

[0018] A temperature sensor is installed inside the smoldering generator to obtain the internal ambient temperature of the smoldering generator.

[0019] Optionally, the reaction system further includes:

[0020] The central control unit is connected to the temperature sensor and is used to generate control signals based on the internal ambient temperature.

[0021] Optionally, the smoldering reaction unit further includes:

[0022] An air compressor, connected to the smoldering reactor, is used to supply air;

[0023] An oxygen cylinder, connected to the smoldering reactor, is used to supply oxygen;

[0024] A first gas flow controller, connected to the central control unit, is located between the air compressor and the smoldering reactor and is used to increase the air supply rate according to the control signal.

[0025] A second gas flow controller, connected to the central control unit, is located between the oxygen cylinder and the smoldering reactor and is used to increase the oxygen supply rate according to the control signal.

[0026] Optionally, the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering further includes:

[0027] A PID temperature control unit, connected to the heat storage unit and the boiling reaction unit, is used to acquire the boiling liquid temperature and the boiling reaction temperature, and to control the heat energy transfer rate of the heat storage unit based on the boiling liquid temperature and the boiling reaction temperature.

[0028] Optionally, the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering further includes:

[0029] A flue gas purifier, connected to the smoldering reaction unit and the simmering reaction unit, is used to purify the flue gas products of the self-sustaining smoldering and simmering reactions.

[0030] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0031] This invention discloses a self-sustaining smoldering combustion-based coupled reaction system for solid waste treatment and scouring. The system processes organic solid waste to obtain smoldering feedstock, which undergoes a self-sustaining smoldering reaction within a smoldering reaction unit. A heat storage unit collects and stores the heat energy generated by the smoldering reaction. A scouring reaction unit preheats the scouring liquid based on this heat energy and sprays the preheated scouring liquid onto cotton textiles for scouring. This invention combines the self-sustaining smoldering reaction of organic solid waste with the scouring reaction, achieving low-energy treatment of organic solid waste while utilizing the heat energy generated by the smoldering of the organic solid waste in the scouring reaction, thus realizing the treatment and utilization of organic solid waste. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the module structure of the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering combustion according to the present invention;

[0034] Figure 2 This is a schematic diagram of the process of the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering combustion according to the present invention.

[0035] Figure 3 This is a schematic diagram of the physical structure of the solid waste treatment and boiling coupled reaction system based on self-sustaining smoldering combustion according to the present invention.

[0036] Symbol explanation:

[0037] Smoldering raw material-01, ash-02, scouring liquid-03, cotton textiles-04, raw material processing unit-1, material storage bin-11, crushing and grinding bin-12, material mixing bin-13, material feeding port-14, smoldering reaction unit-2, smoldering reactor-21, heating wire-22, fine stone layer-23, air compressor-24, oxygen cylinder-25, gas flow controller-26, thermocouple-27, data acquisition card-28, heat storage unit-3, scouring reaction unit-4, scouring generation chamber-41, pressure valve-42, spray head-43, flue gas purifier-5, central control unit-6, PID temperature control unit-7. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The purpose of this invention is to provide a self-sustaining smoldering-based coupled reaction system for solid waste treatment and scouring. This system utilizes the heat energy generated from the smoldering reaction of low-energy-input organic solid waste for the scouring reaction, thereby achieving the treatment and utilization of organic solid waste. This invention also simplifies the cotton textile processing in the scouring reaction and reduces scouring costs.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Figure 1 This is a schematic diagram of the modular structure of the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering of the present invention. (See attached diagram) Figure 1 The present invention relates to a self-sustaining smoldering combustion-based solid waste treatment and scouring coupled reaction system, comprising: a raw material processing unit 1, a smoldering reaction unit 2, a heat storage unit 3, and a scouring reaction unit 4, wherein the raw material processing unit 1, the smoldering reaction unit 2, the heat storage unit 3, and the scouring reaction unit 4 are sequentially connected. Organic solid waste is stored in the raw material processing unit 1; scouring liquid 03 and cotton textile 04 are respectively stored in the scouring reaction unit 6.

[0042] The raw material processing unit 1 obtains smoldering raw material 01 by processing the organic solid waste. The raw material processing unit 1 then transports the smoldering raw material 01 to the smoldering reaction unit 2.

[0043] The smoldering reaction unit 2 heats the smoldering raw material 01, and the smoldering raw material 01 undergoes a smoldering reaction to generate heat energy.

[0044] The thermal energy is stored in the thermal storage unit 3.

[0045] The scouring reaction unit 4 preheats the scouring liquid 03 with thermal energy and sprays the scouring liquid 3 onto the cotton fabric 04; the cotton fabric 04 and the scouring liquid 3 undergo a scouring reaction based on the thermal energy.

[0046] Figure 2 This is a schematic diagram of the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering, as described in this invention. See also... Figure 2 The process of the self-sustaining smoldering combustion coupled reaction system for solid waste treatment and scouring of this invention includes:

[0047] S01: The first stage is material preparation. Organic solid waste is stored in the material storage bin 11. After being processed by the crushing and grinding bin 12, the organic solid waste enters the material mixing bin 13, where it is mixed with sand and gravel to increase the porosity of the material and thus increase the contact area between the processed organic solid waste and oxygen. After the organic solid waste and sand and gravel are mixed evenly in a 3:7 ratio, they are transported to the smoldering reaction unit 2 and accumulated to a preset height to prepare for subsequent self-sustaining smoldering.

[0048] Experiments have confirmed that maintaining a mixing ratio of 3:7 between sand and gravel and organic solid waste results in the best smoldering effect for the resulting smoldering raw material 01.

[0049] Figure 3 This is a schematic diagram of the physical structure of the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering combustion, as described in the present invention. Figure 3As shown (solid lines represent pipe connections, dashed lines represent circuit connections), the raw material processing unit 1 includes a material storage chamber 11, a crushing and grinding chamber 12, and a material mixing chamber 13 connected in sequence.

[0050] The material storage bin 11 is used to store the organic solid waste.

[0051] The crushing and grinding chamber 12 is connected to the material storage chamber 11. The crushing and grinding chamber 12 uses a crusher to pulverize the organic solid waste.

[0052] The material mixing chamber 13 is connected to the crushing and grinding chamber 12 and the smoldering reaction unit 2. The material mixing chamber 13 uses a stirrer to uniformly mix the crushed organic solid waste with the combustion aid to obtain the smoldering raw material 01, and then transports the smoldering raw material 01 to the smoldering reaction unit 2.

[0053] S02: Self-sustaining smoldering reaction stage. Under the heating and ignition action of the heating wire 22 at the bottom of the smoldering reactor 21 in the smoldering reaction unit 2, the smoldering raw material 01 in the smoldering reactor 21, along with the combustion-supporting air introduced from the bottom of the smoldering reactor 21 by the air compressor 24, achieves self-sustaining smoldering, and the organic solid waste is treated through smoldering incineration. At the same time, the heat energy generated by the cracking and oxidation process of the smoldering raw material 01 during self-sustaining smoldering is collected and stored in the heat storage unit 3. When the heat energy provided by the current self-sustaining smoldering is insufficient to maintain the boiling reaction, the oxygen cylinder 25 is opened to increase the oxygen supply rate, intensify the self-sustaining smoldering, and thus ensure the stable and continuous progress of the boiling reaction.

[0054] Optionally, the smoldering reaction unit 2 includes a smoldering generator 21, a heating wire 22, and a temperature sensor.

[0055] The heating wire 22 is used to heat the smoldering raw material 01.

[0056] The heating wire 21 is installed at the bottom of the smoldering generator 21 and is connected to the raw material processing unit 1. The smoldering raw material 01 undergoes a smoldering reaction in the smoldering generator 21 to generate heat energy.

[0057] A temperature sensor is installed inside the smoldering generator 21. The temperature sensor is used to obtain the internal ambient temperature of the smoldering generator 21.

[0058] The present invention also includes a central control unit 6 for a self-sustaining smoldering combustion-based solid waste treatment and calcination coupled reaction system.

[0059] The central control unit 6 is connected to the temperature sensor. The central control unit 6 is used to generate control signals based on the internal ambient temperature.

[0060] The temperature sensor inside the smoldering generator 2 is a thermocouple 27. The solid waste treatment and scalding coupled reaction system based on self-sustaining smoldering of this invention also includes a data acquisition card 28. The data acquisition card 28 is connected to the plurality of thermocouples 27 and the central control unit 6. The data acquisition card 9 is used to acquire the thermoelectric potential signals of the plurality of thermocouples 8. The central control unit 6 converts the thermoelectric potential signals into temperature data for corresponding different diameters.

[0061] The smoldering reaction unit 2 further includes an air compressor 24, an oxygen cylinder 25, a first gas flow controller, and a second gas flow controller; the gas flow controller 26 includes a first gas flow controller and a second gas flow controller.

[0062] The air compressor 24 is connected to the smoldering reactor 21; the air compressor 24 is used to supply air.

[0063] The oxygen cylinder 25 is connected to the smoldering reactor 21; the oxygen cylinder 25 is used to supply oxygen.

[0064] The air compressor 24 and oxygen cylinder 25 are connected to the bottom of the smoldering reactor 21. Because the temperature inside the smoldering reactor 21 rises during the smoldering reaction, generating an upward flow of hot air, the air or oxygen is introduced from the bottom of the smoldering reactor 21 to ensure full utilization and allow for sufficient contact between the air or oxygen and the smoldering feedstock 01.

[0065] The first gas flow controller is connected to the central control unit 6 and is disposed between the air compressor 24 and the smoldering reactor 21. The first gas flow controller is used to increase the air supply rate according to the control signal.

[0066] The second gas flow controller is connected to the central control unit 6 and is located between the oxygen cylinder 25 and the smoldering reactor 21. The second gas flow controller is used to increase the oxygen supply rate according to the control signal.

[0067] When multiple thermocouples 27 detect that the temperature inside the smoldering reactor 21 is lower than a preset value, the central control unit 6 sends a first control signal, and the first gas flow controller increases the air supply rate of the air compressor 24 according to the first control signal. If the increased air supply rate of the air compressor 24 is still insufficient, the central control unit sends a second control signal, and the second gas flow controller increases the oxygen supply rate of the oxygen cylinder 25 according to the second control signal. Optionally, the air supply rate and the oxygen supply rate can be 0.

[0068] The oxygen concentration in the oxygen cylinder 25 is increased by 5%-10% compared to the oxygen concentration in the air. This is achieved by matching the gas flow rates supplied by the oxygen cylinder 25 and the air compressor 24. Under normal circumstances, the oxygen content supplied by the air compressor 24 alone is the same as the oxygen content in the air, i.e., an oxygen concentration of 21%.

[0069] S03: Impurity removal stage for cotton textiles 04. The scouring reaction is maintained by collecting and storing the heat energy generated during the self-sustaining smoldering process of the smoldering raw material 01. The heat storage unit 3 transfers the heat energy to the scouring reaction unit 4, including the following two energy level allocation steps:

[0070] 1) In the early stage of self-sustaining smoldering (<1.5h), the cracking reaction dominates, and the released heat energy is relatively low (the temperature range of self-sustaining smoldering is 250-500℃). At this time, the heat energy collected by the heat storage unit 3 is first used to preheat the boiling solution 03 containing strong alkali, sodium bisulfite, water glass and trisodium phosphate. The preheating is stopped after reaching 100-120℃ to prepare for the subsequent boiling reaction.

[0071] 2) In the later stage of self-sustaining smoldering (>1.5h), oxidation reaction dominates, releasing a high amount of heat energy (the temperature range of self-sustaining smoldering at this time is 500-800℃). After the scouring liquid 03 is preheated, the heat energy collected by the heat storage unit 3 is used for the scouring reaction. The spray head 43 sprays the scouring liquid 03 onto the cotton fabric 04 (the temperature of the scouring liquid 03 rises and is maintained between 150-170℃), and the scouring reaction begins.

[0072] Scouring reactions can remove co-existing organisms, impurities, and residual sizing from cotton fibers, thereby enhancing the absorbency of cotton materials and improving their colorability to dyes during the printing and dyeing process.

[0073] To ensure the scouring quality of cotton textiles, the solid waste treatment and scouring coupled reaction system based on self-sustaining smoldering also includes a PID (Proportion Integral Derivative) temperature control unit 7.

[0074] The PID temperature control unit 7 is connected to the heat storage unit 3 and the boiling reaction unit 7; the PID temperature control unit 7 is used to obtain the temperature of the boiling liquid O3 and the boiling reaction temperature, and to control the heat energy transfer rate of the heat storage unit according to the temperature of the boiling liquid O3 and the boiling reaction temperature.

[0075] The PID temperature control device 11 is equipped with a temperature probe, which can sense the temperature of the cooking chamber 41; the PID temperature control device 11 also controls the temperature by adjusting the flow rate of the circulating cooling water.

[0076] The PID temperature control unit 7 acquires the temperature of the boiling solution 03 and the boiling reaction temperature based on the temperature probe, and also acquires the preset temperature of the boiling solution 03 and the preset temperature of the boiling reaction. When the temperature of the boiling solution 03 is greater than the preset temperature of the boiling solution 03, the PID temperature control unit 7 controls the heat storage unit 3 to reduce the current heat transfer rate; when the temperature of the boiling solution 03 is less than the preset temperature of the boiling solution 03, the PID temperature control unit 7 controls the heat storage unit 3 to increase the current heat transfer rate. When the boiling reaction temperature is greater than the preset temperature of the boiling reaction, the PID temperature control device 11 controls the heat storage unit 3 to reduce the current heat transfer rate; when the boiling reaction temperature is less than the preset temperature of the boiling reaction, the PID temperature control unit 7 controls the heat storage unit 3 to increase the current heat transfer rate.

[0077] S04: During the smoldering and smelting reactions, a series of gaseous pollutants such as carbon monoxide, VOCs (Volatile Organic Compounds), and nitrogen oxides, as well as particulate matter (PM) <2.5μm, are generated. These pollutants are treated and discharged by the flue gas purifier 5. Gaseous pollutants are eliminated through the gas purification reaction of the flue gas purifier 5, while particulate pollutants are collected through the PTFE (Polytetrafluoroethylene) filter membrane of the flue gas purifier 5. Harmful flue gas is discharged after being purified and filtered by the flue gas purifier 5, which reduces pollutant emissions and prevents environmental pollution.

[0078] Optionally, the solid waste treatment and scalding coupled reaction system based on self-sustaining smoldering also includes a flue gas purifier 5.

[0079] The flue gas purifier 5 is connected to the smoldering reaction unit 2 and the simmering reaction unit 4. The flue gas purifier 11 is used to purify the flue gas products of the smoldering reaction and the simmering reaction.

[0080] Specifically, in this embodiment of the invention, organic solid waste is first added to the material storage bin 11, and then the organic solid waste is ground in the crushing and grinding bin 12. The ground small pieces of organic solid waste enter the mixing bin 13, where they are mixed and stirred with the sand and gravel contained therein. After being stirred evenly, smoldering raw material 01 is obtained. Then, smoldering raw material 01 is conveyed into the smoldering reaction unit 3. After smoldering raw material 01 enters the smoldering reactor 21 through the material inlet, the heating wire 22 at the bottom of the smoldering reactor 21 is energized to perform smoldering ignition (the heating wire 6 is ignited and maintained for 5 minutes. When the thermocouple 27 at the bottom heats up to 250°C, the smoldering ignition is successful, and heating is stopped). When the heating wire 22 is energized, the air compressor 24 is turned on to supply air (flow rate of 200-300 L / min). The air enters from the bottom of the smoldering reactor 21, passes through the fine stone layer 23 and ash 02, and then comes into contact with the smoldering raw material 01. The fine stone layer 23 is used to divert the incoming gas, ensuring that it is in full contact with the smoldering raw material 01. The ash 02 is used to dry the gas, ensuring the smoldering reaction proceeds normally. After the smoldering reaction begins, thermocouples 27 record the temperature of the smoldering reaction at different radial positions of the smoldering reactor 21 in real time. When the temperature data obtained by all thermocouples 27 is less than 250°C, and the heat energy provided by the smoldering reaction is insufficient to sustain the boiling reaction, the central control unit 6 sends a second control signal. According to the second control signal, the second gas flow controller opens the oxygen cylinder 25, increasing the oxygen supply rate (the oxygen concentration supplied by the oxygen cylinder 25 is increased by 5%-10% compared to the 21% oxygen content of the air), thus intensifying the smoldering reaction. The heat energy generated by the smoldering reaction is stored in the heat storage unit 3.

[0081] After collecting the heat energy generated by the smoldering cracking and oxidation of the smoldering raw material 01, the heat storage unit 3 provides heat energy to the scouring reaction unit 4 to preheat the scouring liquid 03. The scouring reaction begins after the scouring liquid 03 is preheated. After the scouring reaction begins, the pressure valve 42 opens, and the spray head 43 sprays the scouring liquid 03 onto the cotton fabric 04, and the scouring reaction officially begins. The temperature of the scouring liquid 03 needs to reach 100-120℃ during the preparation process, which is the preset temperature of the scouring liquid 03. During the scouring reaction, the PID temperature control unit 6 maintains the scouring liquid 03 in the scouring generating chamber 41 at 150-170℃, and the temperature of the cotton fabric 04 after spraying the scouring liquid 03 fluctuates within (150-170℃) ± 5℃. The pressure valve 42 keeps the pressure of the scouring reaction unit 4 between 150-180 kPa. After the temperature of the cotton fabric 04 and the pressure of the scouring reaction unit 4 stabilize, the scouring reaction continues for 5-6 hours. After the scouring reaction is completed, the heat storage unit 3 is turned off, and the scouring reaction products are purified and discharged through the flue gas purifier 5.

[0082] Adding a certain concentration of caustic soda solution (8-10 g / L for thin fabrics, 12-15 g / L for thick fabrics) to the scouring solution 03 promotes the saponification and emulsification of fatty waxes by the alkali and its products, the formation of sodium pectate from pectin, and the hydrolysis of nitrogenous substances into soluble substances. Simultaneously, sodium bisulfite, water glass, and trisodium phosphate are also added to the scouring solution 03. Sodium bisulfite removes lignin during scouring and prevents cellulose oxidation. Water glass adsorbs and coagulates metallic impurities in the scouring solution, prevents calcium stains from forming on the surface of cotton fabric 04, and increases its whiteness and wettability. Trisodium phosphate acts as a complexing agent to prevent the redeposition of calcium and magnesium salts. The smoldering and boiling reactions produce a series of gaseous (CO, VOCs, NOx) and particulate (PM<2.5μm) pollutants. The gaseous pollutants are eliminated by the gas purifier reaction in flue gas purifier 5, while the particulate pollutants are collected by the PTFE filter membrane in flue gas purifier 5.

[0083] This invention utilizes a self-sustaining smoldering solid waste treatment and calcination coupled reaction system, taking advantage of the similar energy output of smoldering to that required for calcination, to achieve efficient treatment of organic solid waste and energy resource recovery. In this embodiment, the energy required for smoldering ignition of organic solid waste is <5.0 kW / m³. 2 It is far more powerful than the energy required for open flame ignition (>40kW / m³). 2 The energy input required to trigger the smoldering reaction of organic solid waste is less than 1 / 8 that of an open flame. The energy generated by the smoldering of organic solid waste is 4-6 MJ / m³. 3 The average energy input required for scouring cotton fabric is 10 MJ / m². 3 That is, removing 2 units of solid waste can meet the energy demand of about 1 unit of boiling reaction.

[0084] As can be seen from the above, the present invention is based on a self-sustaining smoldering solid waste treatment and boiling coupled reaction system, which combines self-sustaining smoldering and boiling. It achieves low-energy organic solid waste treatment through smoldering, while using the heat energy generated by smoldering for boiling reaction. Finally, the emissions are filtered and discharged through a flue gas purifier, realizing the application of a low-energy, low-pollution solid waste treatment and boiling coupled reaction system.

[0085] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0086] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the system and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A self-sustaining smoldering-based solid waste treatment and scouring coupled reaction system, characterized in that, The self-sustaining smoldering-based solid waste treatment and scouring coupling reaction system comprises, in sequence, a raw material treatment unit, a smoldering reaction unit, a heat storage unit and a scouring reaction unit, the organic solid waste is stored in the raw material treatment unit, and the scouring liquid and the cotton textile are stored in the scouring reaction unit respectively; The raw material treatment unit obtains smoldering raw material by treating the organic solid waste, and delivers the smoldering raw material to the smoldering reaction unit; The smoldering reaction unit heats the smoldering raw material, and the smoldering raw material generates heat energy through smoldering reaction; The heat storage unit stores the heat energy; The scouring reaction unit preheats the scouring liquid according to the heat energy, and sprays the scouring liquid onto the cotton textile; the cotton textile and the scouring liquid perform scouring reaction according to the heat energy; The reaction system further comprises a PID temperature control unit connected with the heat storage unit and the scouring reaction unit, which is used to obtain the temperature of the scouring liquid and the scouring reaction temperature, and obtain the preset temperature of the scouring liquid and the preset temperature of the scouring reaction; when the temperature of the scouring liquid is greater than the preset temperature of the scouring liquid, the PID temperature control unit controls the heat storage unit to reduce the current heat energy transmission rate; when the temperature of the scouring liquid is less than the preset temperature of the scouring liquid, the PID temperature control unit controls the heat storage unit to increase the current heat energy transmission rate; when the scouring reaction temperature is greater than the preset temperature of the scouring reaction, the PID temperature control device controls the heat storage unit to reduce the current heat energy transmission rate; when the scouring reaction temperature is less than the preset temperature of the scouring reaction, the PID temperature control unit controls the heat storage unit to increase the current heat energy transmission rate; The preset temperature of the scouring liquid is 100-120℃, and the preset temperature of the scouring reaction is 150-170℃; The heat storage unit transmits heat energy to the scouring reaction unit, which comprises the following two energy level distribution steps: In the early stage of self-sustaining smoldering, the cracking reaction is dominant, the temperature range of self-sustaining smoldering is 250-500℃, at this time the heat energy collected by the heat storage unit is used to preheat the scouring liquid, and the preheating stops after the temperature of the scouring liquid reaches 100-120℃, which prepares for the subsequent scouring reaction; In the later stage of self-sustaining smoldering, the oxidation reaction is dominant, at this time the temperature range of self-sustaining smoldering is 500-800℃, when the preheating of the scouring liquid is completed, the heat energy collected by the heat storage unit is used for the scouring reaction, the scouring liquid is sprayed on the cotton textile, the temperature of the scouring liquid is increased and maintained at 150-170℃, and the scouring reaction starts.

2. The self-sustaining smoldering-based solid waste treatment and kiering coupled reaction system according to claim 1, wherein, The raw material treatment unit comprises, in sequence, a material storage bin, a crushing and grinding bin and a material stirring bin; The material storage bin is used to store the organic solid waste; The crushing and grinding bin crushes and grinds the organic solid waste through a crushing and grinding device; The material stirring bin is connected with the smoldering reaction unit, and the material stirring bin uniformly mixes the crushed and ground organic solid waste and the combustion improver through a stirrer to obtain the smoldering raw material, and delivers the smoldering raw material to the smoldering reaction unit.

3. The self-sustaining smoldering-based solid waste treatment and kiering coupled reaction system according to claim 1, characterized in that, The smoldering reaction unit comprises: A heating wire for heating the smoldering raw material; The smoldering generator is provided with the heating wire at the bottom and communicates with the raw material processing unit; the smoldering raw material generates smoldering reaction in the smoldering generator to produce heat energy; The temperature sensor is arranged in the smoldering generator and is used to acquire the internal environment temperature of the smoldering generator.

4. The self-sustaining smoldering-based solid waste treatment and kiering coupled reaction system according to claim 3, characterized in that, The reaction system further comprises: The central control unit is connected with the temperature sensor and is used to generate a control signal according to the internal environment temperature.

5. The self-sustaining smoldering-based solid waste treatment and kiering coupled reaction system according to claim 4, characterized in that, The smoldering reaction unit further comprises: The air compressor communicates with the smoldering reactor and is used to supply air; The oxygen cylinder communicates with the smoldering reactor and is used to supply oxygen; The first gas flow controller is connected with the central control unit, is arranged between the air compressor and the smoldering reactor and is used to increase the air supply rate according to the control signal; The second gas flow controller is connected with the central control unit, is arranged between the oxygen cylinder and the smoldering reactor and is used to increase the oxygen supply rate according to the control signal.

6. The self-sustaining smoldering-based solid waste treatment and kiering coupled reaction system according to claim 1, wherein, The smoldering reaction unit further comprises: The flue gas purifier communicates with the smoldering reaction unit and the scouring reaction unit and is used to purify the flue gas product of the smoldering reaction and the scouring reaction.

Images