Small-scale domestic waste clean incineration system and energy balance method thereof

Abstract

The present invention provides a small-scale household garbage clean incineration system and an energy balance method thereof, wherein the secondary combustion flue gas discharged from the secondary combustion chamber is used to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber through a regenerator, and the temperature of the combustion air of the incinerator and the secondary combustion chamber is adjusted to balance the energy required for the reaction of the incinerator and the secondary combustion chamber. The small-scale household garbage clean incineration system and the energy balance method thereof of the present invention can achieve energy balance under the ideal reaction state of the furnace for household garbage, especially low calorific value household garbage, without the need to supplement auxiliary energy or increase the calorific value of the garbage, so that the incineration system has better adaptability to household garbage, while reducing the concentration of harmful substances in the flue gas, reducing the difficulty and cost of flue gas treatment, thereby achieving the unity of economy and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic waste treatment, and in particular to a small-scale domestic waste clean incineration system and an energy balance method thereof. Background Art

[0002] Proper treatment and disposal of domestic waste is an important part of ecological civilization construction and promoting sustainable social development. Incineration is one of the most effective means to reduce and harmlessly treat domestic waste. Compared with the large-scale centralized incineration power generation model, the use of a small-scale domestic waste clean incineration system to treat domestic waste through a grid-distributed multi-station coordinated operation model has obvious advantages such as no need to build emergency landfills and transfer systems, and greatly reduced construction investment costs and comprehensive operating costs. It is one of the important development ideas for solving urban and rural domestic waste.

[0003] Because the composition of domestic waste is complex and varies greatly, including the composition, moisture content, calorific value and other parameters of the waste, which are closely related to the region and season, it is difficult for the current small-scale domestic waste incineration system to achieve satisfactory operation results. The fundamental reason is that during the operation and incineration of domestic waste in the furnace, the heat generated by the waste is not enough to balance the heat dissipation of the furnace, the preheating of the waste and the mixed combustion air, the heat taken away by the incineration, and the energy required for the incineration flue gas to reach a sufficiently high temperature. Especially for small-scale domestic waste pyrolysis furnaces, which is one of the current mainstream development directions, whether it is the cracking reaction of high molecular components such as plastics and rubber in the waste, or the dry distillation reaction of biomass components, they are all endothermic reactions. The energy in the furnace is even more difficult to balance, making it difficult for the waste to continue to carry out the ideal pyrolysis reaction in the furnace and directly enter the oxidation reaction mode of exothermic heat. Even the furnace temperature cannot rise at all, and harmful pollutants are generated in large quantities, and the generated harmful pollutants are difficult to be effectively oxidized and decomposed and removed, which leads to excessive flue gas pollutant emissions.

[0004] In order to promote the smooth and controllable reaction process of garbage in the furnace according to the design target, it is necessary to input heat into the furnace through a burner when the calorific value of the garbage is insufficient, or to dry the garbage to increase its calorific value, or to add high calorific value components such as wood to the garbage. Either method will be difficult to promote due to the high equipment investment cost and operating cost.

[0005] Therefore, developing an energy balance method and structure for a small incineration system that does not require garbage drying, or does not require the addition of high calorific value substances to the garbage, or does not require the use of fossil fuels to provide auxiliary energy is of great significance for the development of decentralized domestic waste treatment in my country. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a small-scale domestic waste clean incineration system and an energy balance method thereof, so as to solve the problem that the energy in the waste clean incineration system in the prior art is difficult to be balanced under ideal conditions during operation.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] An energy balance method for a small-scale domestic waste clean incineration system comprises the following steps:

[0009] The secondary combustion flue gas discharged from the secondary combustion chamber is used to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber through a regenerator, and the temperature of the combustion air of the incinerator and the secondary combustion chamber is adjusted to optimize the reaction process of the garbage in the incinerator and the primary combustion flue gas in the secondary combustion chamber.

[0010] Preferably, the secondary combustion flue gas is generated by the following steps:

[0011] The first fuel mixed with combustion air is introduced into the incinerator, a combustion reaction occurs in the incinerator, and a first combustion flue gas containing organic combustible components is generated;

[0012] The secondary combustion chamber is introduced with the secondary combustion air, and the primary combustion flue gas undergoes an oxidation reaction in the secondary combustion chamber, the reaction releases heat and produces the secondary combustion flue gas.

[0013] The energy balance method of the small-scale clean incineration system of domestic waste described in the present invention is to introduce the primary flue gas and the secondary combustion air containing organic combustible components generated in the incinerator into the secondary combustion chamber at the same time, and the organic combustible components in the primary flue gas undergo oxidation reaction in the secondary combustion chamber and are decomposed and removed, and the heat released further increases the temperature of the flue gas to become high-temperature secondary combustion flue gas. The secondary combustion flue gas flows through the regenerator to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber. Preferably, the regenerator includes a first regenerator and a second regenerator; the secondary combustion flue gas flows through the first regenerator and the second regenerator in sequence; one path of air is heated and heated by the secondary combustion flue gas in the first regenerator to become the secondary combustion air, so as to promote the better operation of the secondary combustion chamber; the other path of air is also heated and heated by the secondary combustion flue gas in the second regenerator to become the primary combustion air, and enters the incinerator to maintain the reaction of the garbage in the furnace. Since the high-temperature combustion air carries more energy, it is more conducive to the garbage to maintain an ideal reaction state in the furnace. The core idea of ​​this method is to transfer the energy in the high-temperature secondary combustion flue gas back to the incinerator and the secondary combustion chamber. On the one hand, it enables the reaction of the garbage in the furnace to have a better energy balance ability, that is, the incinerator has a better adaptability to low calorific value garbage, so that the reaction process of the garbage in the incinerator can be optimized; on the other hand, it is conducive to the faster and more thorough oxidation reaction of the organic combustible components contained in the primary combustion flue gas in the secondary combustion chamber, thereby reducing the concentration of harmful substances in the secondary combustion flue gas.

[0014] The small-scale household waste clean incineration system of the present invention is used to implement the energy balance method of the small-scale household waste clean incineration system, including an incinerator, a secondary combustion chamber, a first regenerator, and a second regenerator connected in series with the first regenerator; and also includes:

[0015] a flue gas pipe, one end of which is connected to the outlet of the incinerator, and the other end of which is connected to the inlet of the secondary combustion chamber;

[0016] A secondary combustion air intake pipe, one end of which is connected to the secondary combustion chamber, and the other end of which is connected to the air side outlet of the first regenerator;

[0017] A secondary combustion flue gas pipe, one end of which is connected to the secondary combustion chamber, and the other end of which is connected to the inlet of the first regenerator;

[0018] A fuel air intake pipe, one end of which is connected to the air side outlet of the second heat regenerator, and the other end of which is connected to the incinerator.

[0019] By adopting the above structure, when the small-scale domestic waste clean incineration system is working, a part of the air is sent into the second heat exchanger, and the temperature of the air is increased to above 250°C through the heat exchange between the air and the secondary combustion flue gas to become the first-fuel mixed combustion air, and the first-fuel mixed combustion air enters the incinerator through the first-fuel intake pipe to maintain the reaction of the garbage in the incinerator, and improves the energy balance relationship of the reaction of the garbage in the furnace of the incinerator and optimizes the reaction process; the other part of the air is sent into the first heat exchanger, and the temperature of the air is increased to above 200°C through the heat exchange between the air and the secondary combustion flue gas to become the second-fuel mixed combustion air, and the second-fuel mixed combustion air enters the secondary combustion chamber through the second-fuel intake pipe to undergo an oxidation reaction with the organic combustible components in the first-fuel flue gas.

[0020] Preferably, the small-scale domestic waste clean incineration system further comprises a first fuel air pipe and a second fuel air pipe;

[0021] The fuel air pipe is connected to the air side inlet of the second regenerator and is provided with a fuel valve;

[0022] The secondary combustion air pipe is connected to the air side inlet of the first heat regenerator and is provided with a secondary combustion valve.

[0023] With this structure, when the small-scale household garbage clean incineration system is working, air is sent into the first regenerator and the second regenerator through the first fuel air pipe and the second fuel air pipe, and is heated and heated by the second fuel flue gas, and then becomes the second fuel mixed combustion air and the first fuel mixed combustion air respectively; the second fuel mixed combustion air enters the secondary combustion chamber through the second fuel intake pipe to maintain the oxidation reaction of the organic combustible components in the first fuel flue gas; the first fuel mixed combustion air enters the incinerator through the first fuel intake pipe to maintain the reaction of garbage in the furnace. The flow rate of air passing through the first fuel air pipe and the second fuel air pipe can be adjusted by the opening size of the first fuel valve and the second fuel valve.

[0024] Preferably, the small-scale household waste clean incineration system further comprises a heat recovery air pipe, a secondary combustion cold air pipe, and a temperature regulating pipe;

[0025] The reheat air pipe is connected to the air side inlet of the first reheater and is provided with a reheat valve;

[0026] The secondary fuel cold air pipe is arranged on the secondary fuel air intake pipe and is provided with a secondary fuel cold air valve;

[0027] The temperature regulating pipe is arranged on the secondary combustion air intake pipe and is provided with a temperature regulating valve.

[0028] Preferably, the small-scale domestic waste clean incineration system further includes a diverter pipe arranged on the temperature regulating pipe and connected thereto, and a diverter valve is provided on the diverter pipe.

[0029] With this structure, when the small-scale clean incineration system for domestic waste is working, part of the air is sent to the second regenerator, and the air at room temperature exchanges heat with the high-temperature secondary combustion flue gas and absorbs energy. After heating, it becomes primary combustion air and enters the incinerator through the primary combustion air intake pipe to maintain the waste reaction; at the same time, the other part of the air is divided into two paths: one of which is the reheated air, which enters the air side inlet of the first regenerator through the reheated air pipe; the other is the secondary combustion cold air, which enters the secondary combustion air intake pipe through the secondary combustion cold air pipe. After leaving the first regenerator, the reheated air is divided into two paths again, one of which is the diverted hot air entering the diverter pipe, and the other is the temperature-adjusting air entering the temperature-adjusting pipe; the temperature-adjusting air and the secondary combustion cold air merge in the secondary combustion air intake pipe, and enter the secondary combustion chamber as the secondary combustion air to maintain the oxidation reaction of the organic combustible components in the primary combustion flue gas.

[0030] The energy balance method of the small-scale household waste clean incineration system using the above structure includes the following steps:

[0031] When the secondary combustion air required by the secondary combustion chamber does not need to be heated or raised in temperature (i.e., air at room temperature can meet the requirement), the temperature regulating valve is closed and the secondary combustion cold air valve is opened, and air at room temperature enters the secondary combustion chamber through the secondary combustion cold air pipe and the secondary combustion air intake pipe to maintain the oxidation reaction of the primary combustion flue gas; at the same time, the reheated air becomes the diverted hot air after being heated by the first regenerator and enters the diverter pipe, and after the diverter valve is opened, the diverted hot air can be discharged or used for other purposes, such as flue gas deoxidation, etc.; the flow rates of the secondary combustion cold air and the reheated air are controlled by the opening of the secondary combustion cold air valve and the reheat valve;

[0032] When the secondary combustion air needs to be heated and raised in temperature, and the temperature to be reached by the secondary combustion air is relatively high, the temperature regulating valve and the secondary combustion cold air valve are fully or partially opened, and the mixing ratio and flow rate of the temperature regulating air and the secondary combustion cold air are adjusted to obtain the secondary combustion air that meets the temperature requirements, and then enter the secondary combustion chamber through the secondary combustion air intake pipe to maintain the oxidation reaction of the primary combustion flue gas 3; the remaining reheated air is heated to become the diverted hot air and discharged through the diverter pipe or used for other purposes; the "higher" temperature here can be determined by those skilled in the art according to actual conditions, and may at least include the following situations: the energy required for the secondary combustion air to reach the required temperature is less than the energy that can be provided by the reheated air;

[0033] When the secondary combustion air needs to be heated and raised in temperature, and the temperature to be reached by the secondary combustion air is very high, the secondary combustion air cooler valve is closed and the thermostatic valve is opened, so that the secondary combustion air is all the thermostatic air, that is, all the reheated air, and the obtained secondary combustion air enters the secondary combustion chamber through the secondary combustion air intake pipe to maintain the oxidation reaction of the primary combustion flue gas. The "very high" temperature here can be determined by those skilled in the art according to actual conditions, and at least includes the following situations: the energy required for the secondary combustion air to reach the required temperature is greater than or equal to the energy that can be provided by the reheated air.

[0034] Preferably, the small-scale clean incineration system for domestic waste further comprises a bypass pipe, one end of which is connected to the secondary combustion flue gas pipe, and the other end of which is connected to the outlet of the second heat regenerator; a bypass valve is provided on the bypass pipe.

[0035] When the incinerator and the secondary combustion chamber do not need to extract energy from the secondary combustion flue gas to optimize the combustion reaction of the garbage and the oxidation reaction process of the primary combustion flue gas, the bypass valve is opened, and the secondary combustion flue gas discharged from the secondary combustion chamber will fully or partially bypass the first reheater and the second reheater and flow directly downstream through the bypass pipe.

[0036] Preferably, the small-scale domestic waste clean incineration system further includes a first gas-blower and a second gas-blower;

[0037] The outlet of the first gas-fired air blower is connected to the air side inlet of the second heat regenerator;

[0038] The outlet of the second gas-fired blower is connected to the air-side inlet of the first regenerator.

[0039] Preferably, the small-scale domestic waste clean incineration system also includes a first gas-blower, the outlet of which is respectively connected to a first gas-blower air pipe and a second gas-blower air pipe; and / or the outlet of the first gas-blower is respectively connected to a heat recovery air pipe and a second gas-blower cold air pipe.

[0040] Preferably, the small-scale household waste clean incineration system further comprises an emergency discharge pipe, which is arranged at the connection between the secondary combustion smoke pipe and the secondary combustion chamber, and an emergency valve is arranged on the emergency discharge pipe. When an emergency occurs, the emergency valve can be opened to perform emergency exhaust of the secondary combustion smoke generated by the secondary combustion into the air to protect the safety of the system.

[0041] Preferably, the first fuel blower and the second fuel blower are variable frequency blowers, that is, the wind pressure and air volume thereof can be adjusted by controlling the speed change of the blower impeller. The flow rates of the first fuel mixed air and the second fuel mixed air can be adjusted by respectively changing the speed of the first fuel blower and the second fuel blower.

[0042] The above solution of the present invention includes at least the following beneficial effects:

[0043] (1) The energy balance method of the small-scale clean incineration system of domestic waste of the present invention is to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber through a regenerator by using the secondary combustion flue gas discharged from the secondary combustion chamber, and adjust the temperature of the combustion air of the incinerator and the secondary combustion chamber to balance the energy required for the reaction of the incinerator and the secondary combustion chamber. The method of the present invention can achieve energy balance under the ideal reaction state of the furnace for domestic waste, especially low calorific value domestic waste, without the need to supplement auxiliary energy or increase the calorific value of the waste, so that the incineration system has better adaptability to domestic waste, while reducing the concentration of harmful substances in the flue gas, reducing the difficulty and cost of flue gas treatment, thereby achieving the unity of economy and environmental protection. Specifically:

[0044] First, it can achieve a good energy balance relationship between various reactions of garbage in the incinerator without adding auxiliary fuel or increasing the calorific value of garbage, which can save operating costs and is also conducive to controlling the furnace temperature and optimizing the reaction process of garbage in the furnace;

[0045] Second, even if the calorific value of the original garbage is low, the secondary combustion flue gas coming out of the secondary combustion chamber can still reach an ideal high temperature state, thereby greatly improving the incineration system's adaptability to low calorific value garbage, especially low calorific value garbage with a high moisture content;

[0046] Third, it can make the operation of the secondary combustion chamber more stable, with a wider working threshold, which is more conducive to the rapid, full and thorough oxidation and decomposition of organic pollutants in the primary flue gas, thereby reducing the difficulty of purifying high-temperature flue gas and better ensuring that the exhaust flue gas meets the emission standards;

[0047] Fourth, since the air side outlet of the first regenerator is provided with a diverter pipe and a diverter valve, when the secondary combustion air at room temperature can meet the requirements of the secondary combustion chamber, the diverted hot air can be used for other purposes, for example, it can provide good conditions for the de-whitening treatment of flue gas when it is discharged into the atmosphere.

[0048] (2) The small-scale household waste clean incineration system of the present invention can realize dynamic adjustment of the temperature and flow rate of each mixed combustion air through the comprehensive design of equipment, pipelines, valves and other structures, so as to improve the energy balance relationship between the reaction of garbage in the incinerator and the reaction of the primary combustion flue gas in the secondary combustion chamber, optimize the reaction process, increase the adaptability of the incinerator to low calorific value garbage, improve the reaction quality of the pyrolysis of garbage in the incinerator, enhance the calorific value of the primary combustion flue gas, and make the operation stability of the secondary combustion chamber better, and the organic combustible components in the primary combustion flue gas are more fully and thoroughly oxidized and decomposed in the secondary combustion chamber, so that the small-scale household waste clean incineration system has better environmental protection and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 1 is a schematic structural diagram of a small-scale household waste clean incineration system according to Embodiment 1 of the present invention;

[0050] Figure 2 Schematic diagram of the structure of a small-scale household waste clean incineration system according to Embodiment 2 of the present invention;

[0051] Figure 3 Schematic diagram of the structure of a small-scale household waste clean incineration system according to Embodiment 3 of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of a small-scale household waste clean incineration system according to Example 4 of the present invention.

[0053] Among them, 1. Incinerator; 2. Combustion flue gas; 3. Combustion flue gas pipe; 4. Emergency discharge pipe; 5. Emergency exhaust; 6. Emergency valve; 7. Secondary combustion chamber; 8. Secondary combustion air; 9. Secondary combustion flue gas; 10. High-temperature flue gas pipe; 11. Secondary combustion air intake pipe; 12. First regenerator; 13. First combustion air; 14. First combustion fan; 15. Air; 16. Secondary regenerator; 17. Combustion air intake pipe; 18. Secondary combustion fan ; 19. First fuel valve; 20. First fuel air pipe; 21. Second fuel air pipe; 22. Second fuel valve; 23. Temperature regulating valve; 24. Diverter hot air; 25. Diverter valve; 26. Diverter pipe; 27. Temperature regulating pipe; 28. Temperature regulating air; 29. ​​Heat recovery valve; 30. Heat recovery air; 31. Second fuel cold air pipe; 32. Heat recovery air pipe; 33. Second fuel cold air; 34. Second fuel cold air valve; 35. Bypass pipe; 36. Bypass valve. DETAILED DESCRIPTION

[0054] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] Example 1

[0056] like Figure 1 As shown, an embodiment of the present invention provides a small-scale household waste clean incineration system, including an incinerator 1, a secondary combustion chamber 7, a first regenerator 12, and a second regenerator 16 connected in series with the first regenerator 12; and further including:

[0057] a flue gas pipe 3, one end of which is connected to the outlet of the incinerator 1, and the other end of which is connected to the inlet of the secondary combustion chamber 7;

[0058] A secondary combustion air intake pipe 11, one end of which is connected to the secondary combustion chamber 7, and the other end of which is connected to the air side outlet of the first regenerator 12;

[0059] A secondary combustion flue gas pipe 10, one end of which is connected to the secondary combustion chamber 7, and the other end of which is connected to the inlet of the first regenerator 12;

[0060] A fuel air intake pipe 17, one end of which is connected to the air side outlet of the second heat regenerator 16, and the other end of which is connected to the incinerator 1.

[0061] In order to ensure the safe operation of the small-scale domestic waste clean incineration system, the system further includes an emergency discharge pipe 4, which is arranged at the connection between the secondary combustion smoke pipe 10 and the secondary combustion chamber 7, and an emergency valve 6 is arranged on the emergency discharge pipe 4. When an emergency occurs, the emergency valve 6 can be opened to discharge the emergency exhaust smoke 5 from the emergency discharge pipe 4, so that the secondary combustion smoke 9 is directly discharged into the air, thereby protecting the safe operation of the system.

[0062] As a preferred implementation of this embodiment, the small-scale clean incineration system for domestic waste also includes a first gas-blower 14 and a second gas-blower 18; wherein the outlet of the first gas-blower 14 is connected to the air-side inlet of the second regenerator 16; and the outlet of the second gas-blower 18 is connected to the air-side inlet of the first regenerator 12. The selection of the first gas-blower 14 and the second gas-blower 18 is not unique, and conventional gas-blower in the prior art can be selected. In this embodiment, the first gas-blower 14 and the second gas-blower 18 are variable frequency fans with speed variable frequency control, and their wind pressure and air volume can be adjusted by controlling the speed change of the fan impeller. The flow rate and pressure of the first fuel-blended combustion air 13 and the second fuel-blended combustion air 8 can be adjusted by the speed change of the first gas-blower 14 and the second gas-blower 18, respectively.

[0063] The working process of the small-scale clean incineration system of domestic waste described in this embodiment is as follows: the small-scale clean incineration system of domestic waste is started, the garbage undergoes a combustion reaction in the incinerator 1, and produces a primary flue gas 2 containing organic combustible components, the primary flue gas 2 is transported to the secondary combustion chamber 7 through a primary flue gas pipe 3, the primary flue gas 2 undergoes an oxidation reaction in the secondary combustion chamber 7, the reaction releases heat and produces the secondary flue gas 9, the secondary flue gas 9 is transported to the first regenerator 12 and the second regenerator 16 connected in series with the first regenerator 12 through the secondary flue gas pipe 10; then, a portion of the air 15 is transported into the second regenerator 16 by the first combustion fan 14, and is heated by the secondary flue gas 9 to increase its temperature. High, becoming the first-fuel mixed combustion air 13, the first-fuel mixed combustion air 13 enters the incinerator 1 through the first-fuel intake pipe 17, so as to maintain the reaction of the garbage in the incinerator 1 and improve the energy balance relationship of the garbage in the incinerator 1, and optimize the garbage reaction process; at the same time, another part of the air 15 is sent into the first reheater 12 by the second-fuel blower 18, and is heated by the second-fuel flue gas 9 to increase its temperature, becoming the second-fuel mixed combustion air 8, the second-fuel mixed combustion air 8 enters the secondary combustion chamber 7 through the second-fuel intake pipe 11, and undergoes an oxidation reaction with the first-fuel flue gas 3, so that the organic combustible components contained in the first-fuel flue gas 3 undergo an oxidation reaction more quickly and thoroughly in the secondary combustion chamber 7, thereby making the concentration of harmful substances in the generated second-fuel flue gas 9 lower.

[0064] The energy balance method of the small-scale clean incineration system of domestic waste described in this embodiment includes the following steps: the secondary combustion flue gas discharged from the secondary combustion chamber is used to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber through a regenerator, the temperature of the combustion air of the incinerator and the secondary combustion chamber is adjusted, and the reaction process of the garbage in the incinerator and the primary combustion flue gas in the secondary combustion chamber is optimized to balance the energy required for the reaction of the incinerator and the secondary combustion chamber. The secondary combustion flue gas is generated by the following steps: the primary combustion air is introduced into the incinerator, a combustion reaction occurs in the incinerator, and primary combustion flue gas containing organic combustible components is generated; the secondary combustion air is introduced into the secondary combustion chamber, and the primary combustion flue gas undergoes an oxidation reaction in the secondary combustion chamber, the reaction releases heat and generates the secondary combustion flue gas.

[0065] Example 2

[0066] like Figure 2 As shown, this embodiment proposes a small-scale household waste clean incineration system, which is different from the embodiment 1 in that the gas blower is set differently. Specifically, this embodiment does not include the second gas blower 18, but only includes the first gas blower 14; and this embodiment also includes a first gas air pipe 20 and a second gas air pipe 21;

[0067] The first fuel air pipe 20 is connected to the air side inlet of the second regenerator 16 and is provided with a fuel valve 19; the second fuel air pipe 21 is connected to the air side inlet of the first regenerator 12 and is provided with a second fuel valve 22. The outlet of the first fuel blower 14 is connected in parallel to the first fuel air pipe 20 and the second fuel air pipe 21 respectively.

[0068] By setting the first fuel valve 19 and the second fuel valve 22 , the gas flow distribution ratio of the first fuel air pipe 20 and the second fuel air pipe 21 can be adjusted.

[0069] The working process of the small-scale clean incineration system of domestic waste described in this embodiment is as follows: the air 15 is pressurized by the first fuel blower 14 and then sent to the first regenerator 12 and the second regenerator 16 through the first fuel air pipe 20 and the second fuel air pipe 21, respectively, and the flow distribution ratio of the two air paths can be adjusted by the opening size of the first fuel valve 19 and the second fuel valve 22. Then, the air 15 is heated and heated by the second fuel flue gas 9 in the first regenerator 12 and the second regenerator 16, and becomes the second fuel mixed combustion air 8 and the first fuel mixed combustion air 13 respectively; the second fuel mixed combustion air 8 enters the secondary combustion chamber 7 through the second fuel intake pipe 11 to maintain the oxidation reaction of the first fuel flue gas 3; the first fuel mixed combustion air 13 enters the incinerator 1 through the first fuel intake pipe 17 to maintain the garbage reaction.

[0070] Example 3

[0071] like Figure 3 As shown, this embodiment proposes a small-scale household waste clean incineration system, which is different from the first embodiment in that: the outlet of the second gas-blower 18 is divided into two parallel paths, and the air side outlet of the first regenerator 12 is again divided into two parallel paths. Specifically, this embodiment also includes a heat recovery air pipe 32, a second gas-cooling air pipe 31, a temperature regulating pipe 27, and a diverter pipe 26;

[0072] The heat recovery air pipe 32 is connected to the air side inlet of the first heat regenerator 12 and is provided with a heat recovery valve 29; the secondary fuel cold air pipe 31 is arranged on the secondary fuel intake pipe 11 and is provided with a secondary fuel cold air valve 34; the temperature regulating pipe 27 is arranged on the secondary fuel intake pipe 11 and is provided with a temperature regulating valve 23.

[0073] With such an arrangement, the second gas blower 18 is divided into two gas paths: one path is the reheated air 30 passing through the reheated air pipe 32 connected to the air side inlet of the first reheater 12; the other path is the second fuel cold air 33 passing through the second fuel cold air pipe 31 connected to the second fuel air inlet pipe 11.

[0074] The diverter pipe 26 is disposed on the temperature regulating pipe 27 and communicated therewith, and a diverter valve 25 is disposed on the diverter pipe 26 .

[0075] With such an arrangement, the air side outlet of the first regenerator 12 is divided into two gas paths: one path is the temperature-controlled air 28 passing through the temperature-controlled pipe 27 connected to the secondary fuel air intake pipe 11; and the other path is the diverted hot air 24 passing through the diverter pipe 26.

[0076] The working process of the small-scale household garbage clean incineration system described in this embodiment is as follows: the first fuel blower 14 delivers air 15 into the second regenerator 16, and the air 15 is heated to become the first fuel mixed combustion air 13, and enters the incinerator 1 through the first fuel intake pipe 17 to maintain the garbage reaction;

[0077] The second fuel blower 18 divides the air 15 into two paths: one path is the reheated air 30, and the other path is the secondary fuel cold air 33; the reheated air 30 enters the first reheater 12 through the reheated air pipe 32, and the secondary fuel cold air 33 enters the secondary fuel intake pipe 11 through the secondary fuel cold air pipe 31; after leaving the first reheater 12, the reheated air 30 is divided into two paths again: one path is the diverted hot air 24 entering the diverter pipe 26, and the other path is the temperature-adjusting air 28 entering the temperature-adjusting pipe 27; the temperature-adjusting air 28 and the secondary fuel cold air 33 are combined in the secondary fuel intake pipe 11 and enter the secondary combustion chamber 7 as the secondary fuel blending air 8 to maintain the oxidation reaction of the primary fuel flue gas 3.

[0078] The energy balance method of the small-scale domestic waste clean incineration system described in this embodiment also includes the following steps:

[0079] When the secondary combustion air 8 required by the secondary combustion chamber 7 does not need to be heated or heated (i.e., air at room temperature can meet the requirement), the temperature regulating valve 23 is closed and the secondary combustion cold air valve 34 is opened, and the air 15 at room temperature enters the secondary combustion chamber 7 through the secondary combustion cold air pipe 31 and the secondary combustion air intake pipe 11 in sequence to maintain the oxidation reaction of the primary combustion flue gas 3; at the same time, the reheated air 30 is heated by the first reheater 12 and becomes the diverted hot air 24 and enters the diverter pipe 26; after the diverter valve 25 is opened, the diverted hot air 24 is discharged or used for other purposes;

[0080] As a preferred implementation of this embodiment, the flow rate and wind pressure of the secondary fuel cold air 33 and the reheated air 30 can be controlled respectively by controlling the opening of the secondary fuel cold air valve 34, the reheated valve 29, and the speed of the second fuel blower 18;

[0081] When the secondary combustion air 8 needs to be heated and raised in temperature, and the temperature to be reached by the secondary combustion air 8 is relatively high, the temperature regulating valve 23 and the secondary combustion cold air valve 34 are partially or fully opened, and the mixing ratio and flow rate of the temperature regulating air 28 and the secondary combustion cold air 33 are adjusted to obtain the secondary combustion air 8 that meets the temperature requirement, and then the secondary combustion air 8 enters the secondary combustion chamber 7 through the secondary combustion air intake pipe 11 to maintain the oxidation reaction of the primary combustion flue gas 3; the remaining reheated air 30 is heated by the first reheater 12 and becomes the diverted hot air 24 and enters the diverter pipe 26 for discharge or other use; the "relatively high" temperature here can be determined by those skilled in the art according to actual conditions, and may at least include the following situations: the energy required for the secondary combustion air 8 to reach the required temperature is less than the energy that can be provided by the reheated air 30;

[0082] When the secondary combustion air 8 needs to be heated and raised in temperature, and the temperature to be reached by the secondary combustion air 8 is very high, the secondary combustion air 8 is completely heated by closing the secondary combustion air cooler valve 34 and opening the temperature regulating valve 23, so that the secondary combustion air 8 is completely the temperature regulating air 28, that is, completely from the reheated air 30, and the obtained secondary combustion air 8 enters the secondary combustion chamber 7 through the secondary combustion air intake pipe 11 to maintain the oxidation reaction of the primary combustion flue gas 3. The "very high" temperature here can be determined by those skilled in the art according to actual conditions, and at least includes the following conditions: the energy required for the secondary combustion air 8 to reach the required temperature is greater than or equal to the energy that can be provided by the reheated air 30.

[0083] Example 4

[0084] like Figure 4 As shown, this embodiment proposes a small-scale household waste clean incineration system, which is different from the embodiment 3 in that it also includes a bypass pipe 35, one end of which is connected to the secondary combustion flue gas pipe 10, and the other end is connected to the outlet of the second regenerator 16. The bypass pipe 35 is located in the section between the high-temperature flue gas pipe 10 before entering the first regenerator 12 and after exiting the second regenerator 16. A bypass valve 36 is provided on the bypass pipe 35.

[0085] The working process of the small-scale clean incineration system for domestic waste described in this embodiment is as follows: when the bypass valve 36 is opened, the secondary combustion flue gas 9 discharged from the secondary combustion chamber 7 will completely or partially bypass the first reheater 12 and the second reheater 16, and be directly discharged through the bypass pipe 35 or flow downstream.

[0086] The energy balance method of the small-scale household waste clean incineration system using the above structure also includes the following steps:

[0087] When the incinerator 1 and the secondary combustion chamber 7 do not need to extract energy from the secondary combustion flue gas 9 to optimize the combustion reaction of the garbage and the oxidation reaction of the primary combustion flue gas, the bypass valve 36 is opened, and the secondary combustion flue gas 9 discharged from the secondary combustion chamber 7 will fully or partially bypass the first reheater 12 and the second reheater 16, and be directly discharged through the bypass pipe 35 or flow downstream.

[0088] It should also be noted that the small-scale domestic waste clean incineration system described in the present invention is mainly used for small-scale domestic waste incinerators, but can also be used in other occasions, including but not limited to medium-sized domestic waste incinerators, medical waste incinerators, industrial solid waste incinerators, etc.

[0089] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A small-scale household waste clean incineration system, characterized in that: The invention comprises an incinerator (1), a secondary combustion chamber (7), a first heat regenerator (12), and a second heat regenerator (16) connected in series with the first heat regenerator (12); and further comprises: a flue gas pipe (3), one end of which is connected to the outlet of the incinerator (1), and the other end of which is connected to the inlet of the secondary combustion chamber (7); A secondary combustion air intake pipe (11), one end of the secondary combustion air intake pipe (11) is connected to the secondary combustion chamber (7), and the other end is connected to the air side outlet of the first regenerator (12); A secondary combustion flue gas pipe (10), one end of the secondary combustion flue gas pipe (10) is connected to the secondary combustion chamber (7), and the other end is connected to the inlet of the first regenerator (12); a fuel air intake pipe (17), one end of which is connected to the air side outlet of the second regenerator (16), and the other end of which is connected to the incinerator (1); The system further comprises a heat recovery air pipe (32), a secondary combustion cold air pipe (31), and a temperature regulating pipe (27); The heat recovery air pipe (32) is connected to the air side inlet of the first heat regenerator (12) and is provided with a heat recovery valve (29); The secondary fuel cold air pipe (31) is arranged on the secondary fuel air intake pipe (11) and is provided with a secondary fuel cold air valve (34); The temperature regulating pipe (27) is arranged on the secondary fuel intake pipe (11) and is provided with a temperature regulating valve (23); The system further comprises a diverter pipe (26) arranged on the temperature regulating pipe (27) and connected thereto, and a diverter valve (25) is arranged on the diverter pipe (26).

2. The small-scale household waste clean incineration system according to claim 1 is characterized in that: It also includes a first fuel air pipe (20) and a second fuel air pipe (21); The fuel air pipe (20) is connected to the air side inlet of the second regenerator (16) and is provided with a fuel valve (19); The secondary combustion air pipe (21) is connected to the air side inlet of the first regenerator (12) and is provided with a secondary combustion valve (22).

3. The small-scale household waste clean incineration system according to claim 1 is characterized in that: It also includes a bypass pipe (35), one end of which is connected to the secondary combustion flue gas pipe (10), and the other end of which is connected to the outlet of the second heat regenerator (16); a bypass valve (36) is provided on the bypass pipe (35).

4. The small-scale household waste clean incineration system according to claim 1 is characterized in that: It also includes a first gas-fired air blower (14) and a second gas-fired air blower (18); The outlet of the first gas-blower (14) is connected to the air-side inlet of the second regenerator (16); The outlet of the second gas-blower (18) is connected to the air-side inlet of the first regenerator (12).

5. The small-scale household waste clean incineration system according to claim 1 or 2, characterized in that: It also includes a first fuel-air blower (14), wherein the outlet of the first fuel-air blower (14) is respectively connected to a first fuel-air air pipe (20) and a second fuel-air air pipe (21); and / or, the outlet of the first fuel-air blower (14) is respectively connected to a heat recovery air pipe (32) and a second fuel-cooling air pipe (31).

6. The small-scale household waste clean incineration system according to claim 1 is characterized in that: It also comprises an emergency discharge pipe (4), wherein the emergency discharge pipe (4) is arranged at the connection between the secondary combustion smoke pipe (10) and the secondary combustion chamber (7), and an emergency valve (6) is arranged on the emergency discharge pipe (4).

7. An energy balance method for a small-scale domestic waste clean incineration system, characterized in that: The small-scale household waste clean incineration system is a system as claimed in any one of claims 1 to 6, and the method comprises the following steps: The secondary combustion flue gas discharged from the secondary combustion chamber is used to heat the primary combustion air of the incinerator and the secondary combustion air of the secondary combustion chamber through a regenerator, and the temperature of the combustion air of the incinerator and the secondary combustion chamber is adjusted to optimize the reaction process of the garbage in the incinerator and the primary combustion flue gas in the secondary combustion chamber.

8. The energy balance method of a small-scale domestic waste clean incineration system according to claim 7 is characterized in that: The secondary combustion flue gas is generated by the following steps: The first fuel mixed with combustion air is introduced into the incinerator, a combustion reaction occurs in the incinerator, and a first combustion flue gas containing organic combustible components is generated; The secondary combustion chamber is introduced with the secondary combustion air, and the primary combustion flue gas undergoes an oxidation reaction in the secondary combustion chamber, the reaction releases heat and produces the secondary combustion flue gas.

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