Combustion device and combustion system for flame-retardant biomass pyrolysis gas

Abstract

The invention discloses a flame-retardant biomass pyrolysis gas combustion device and system.The flame-retardant biomass pyrolysis gas combustion device comprises an ignition combustion assembly and a gas mixing pipeline, a first spiral pipe and a second spiral pipe are spirally arranged in a surrounding mode, and the spiral directions of the first spiral pipe and the second spiral pipe are opposite; the first gas inlet and the second gas inlet are respectively communicated with pyrolysis gas and fuel gas; the first gas outlet and the second gas outlet are oppositely arranged in the radial direction, and the ignition combustion assembly is arranged above the gas mixing pipeline and communicates with the gas mixing pipeline. Therefore, the pyrolysis gas flowing out of the first gas outlet and the fuel gas flowing out of the second gas outlet collide with each other and are mixed, so that strong turbulence confrontation can be formed, the mixing effect of the pyrolysis gas and the fuel gas is greatly enhanced, the mixed gas of the pyrolysis gas and the fuel gas can be combusted more easily after entering the ignition combustion assembly, and the combustion difficulty can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a combustion device and a combustion system for pyrolysis gas from flame-retardant biomass. Background Art

[0002] With the global demand for sustainable energy surging, biomass energy is attracting significant attention as a renewable, clean energy source. Biomass pyrolysis gas, obtained through pyrolysis technology, is widely used for power generation and heating. However, biomass pyrolysis gas is often produced by the pyrolysis of biomass with a high water content. Due to the energy consumption of water evaporation and the dilution of combustible components, the calorific value of the biomass pyrolysis gas is low and it is difficult to burn. This leads to unstable combustion and low energy efficiency when the biomass pyrolysis gas is subsequently used.

[0003] In the existing technology, before burning biomass pyrolysis gas, it is generally pretreated by reducing moisture to reduce the moisture content of the biomass pyrolysis gas and increase the calorific value of the biomass pyrolysis gas to promote combustion. However, this not only increases equipment costs and energy consumption, but also poses safety hazards.

[0004] In addition, some combustion systems add auxiliary fuel to biomass pyrolysis gas, which increases fuel costs and goes against the original intention of clean energy. Furthermore, the existing combustion systems lack sufficient self-sustaining combustion capacity, which restricts the promotion and application of biomass pyrolysis gas. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a combustion device for pyrolysis gas from refractory biomass, which can make the pyrolysis gas from biomass more combustible and has a simple structure.

[0006] The present invention further proposes a biomass pyrolysis gas combustion system

[0007] According to an embodiment of the present invention, the combustion device for pyrolysis gas of difficult-to-burn biomass includes: an ignition combustion component; a gas mixing pipe, the gas mixing pipe including a first spiral pipe and a second spiral pipe, the first spiral pipe and the second spiral pipe are both spirally arranged and have opposite spiral directions, the upper and lower ends of the first spiral pipe are respectively provided with a first air inlet and a first air outlet, the upper and lower ends of the second spiral pipe are respectively provided with a second air inlet and a second air outlet, the first air inlet and the second air inlet are respectively connected to the pyrolysis gas and the fuel gas; the first air outlet and the second air outlet are radially opposite to each other, the ignition combustion component is arranged above the gas mixing pipe and is connected to the gas mixing pipe.

[0008] As a result, the pyrolysis gas flowing out of the first gas outlet and the fuel gas flowing out of the second gas outlet will collide and mix with each other, which can form a strong turbulent confrontation, greatly enhancing the mixing effect of the pyrolysis gas and the fuel gas, so that the pyrolysis gas and the fuel gas mixture can be more easily burned after entering the ignition combustion component, which can reduce the difficulty of combustion.

[0009] In some examples of the present invention, the gas mixing pipe also includes an auxiliary combustion straight pipe, which extends in the up and down directions and is respectively provided with a third air inlet and a third air outlet at both ends in the up and down directions. The third air inlet is respectively connected to the pyrolysis gas and the fuel gas. The first spiral pipe and the second spiral pipe are both spirally arranged on the outside of the auxiliary combustion straight pipe, and the first air outlet and the second air outlet are both located above the third air outlet and are respectively arranged opposite to each other on both sides of the radial direction of the third air outlet.

[0010] In some examples of the present invention, the ignition and combustion assembly includes a porous diverter, an ignition member and an air duct, a plurality of gas holes are provided in the porous diverter, the porous diverter is respectively connected to the gas mixing duct and the air duct, and the ignition member is arranged on the lower side of the porous diverter.

[0011] In some examples of the present invention, the two ends of the porous diverter in the length direction are set to be the first end and the second end, respectively, the first end is closer to the gas mixing pipe and is connected to the gas mixing pipe, the air pipe is connected to the second end, and the aperture of the gas through hole gradually decreases in the direction from the first end to the second end.

[0012] According to an embodiment of the present invention, the combustion system of biomass pyrolysis gas includes: the above-mentioned combustion device of flame-retardant biomass pyrolysis gas; a pyrolysis device, the pyrolysis device is provided with a pyrolysis gas outlet, and the pyrolysis gas outlet is respectively connected to the first air inlet and the third air inlet; a heat exchange device, the heat exchange device includes a boiler and a steam generating component, the boiler is respectively connected to the ignition combustion component and the pyrolysis device, and the steam generating component is arranged in the boiler to exchange heat with the high-temperature flue gas generated by the combustion of the ignition combustion component to generate superheated steam.

[0013] In some examples of the present invention, the ignition and combustion assembly includes an air duct, which is at least partially arranged in the boiler so that the hot flue gas in the boiler preheats the air duct; and / or the biomass pyrolysis gas combustion system also includes a gas pipeline, which is respectively connected to the second air inlet and the third air inlet, and the gas pipeline is at least partially arranged in the boiler so that the hot flue gas in the boiler preheats the gas pipeline.

[0014] In some examples of the present invention, the steam generating component includes a coal-saving component, a water-cooling component and a superheating component. A supercooled water inlet is provided at one end of the coal-saving component to allow the hot flue gas in the boiler to exchange heat with the supercooled water in the coal-saving component. The other end of the coal-saving component is connected to the water cooler so that the supercooled water after heat exchange forms saturated steam in the water-cooling component. The water-cooled wall is connected to the superheating component so that the saturated steam forms superheated steam for power generation in the superheating component.

[0015] In some examples of the present invention, the pyrolysis device includes a feed bin, a pyrolysis furnace and a separation component. The pyrolysis furnace has a feed end and a discharge end. The feed bin is connected to the feed end, and the separation component is connected to the discharge end. The separation component is suitable for separating the pyrolysis gas and unpyrolyzed material flowing out of the discharge end, and the pyrolysis gas outlet is arranged in the separation component.

[0016] In some examples of the present invention, the separation component includes a separation element, a pyrolysis gas pipeline and a return pipeline. The separation element is suitable for separating the pyrolysis gas and the unpyrolysis material flowing out from the discharge end. One end of the pyrolysis gas pipeline and one end of the return pipeline are respectively connected to the separation element, and the other end of the return pipeline is connected to the feed end. The pyrolysis gas outlet is provided at the other end of one end of the pyrolysis gas pipeline.

[0017] In some examples of the present invention, the biomass pyrolysis gas combustion system further includes a purification device, which includes a water removal component and / or a dust removal component, and the water removal component and / or the dust removal component are arranged in the pyrolysis gas pipeline and located between the two ends of the pyrolysis gas pipeline.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 is a schematic diagram of a biomass pyrolysis gas combustion system according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a combustion device according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 100. Combustion system;

[0024] 10. Pyrolysis device; 11. Feed bin; 12. Pyrolysis furnace; 13. Separation assembly; 131. Separation element; 132. Pyrolysis gas pipeline; 1321. Pyrolysis gas outlet; 133. Return pipe; 14. Purification device; 141. Water removal element; 142. Dust removal element;

[0025] 20. Combustion device; 21. Gas mixing pipe; 211. Auxiliary combustion straight pipe; 2111. Third air inlet; 2112. Third air outlet; 212. Spiral collision pipe; 2121. First spiral pipe; 21211. First air inlet; 21212. First air outlet; 2122. Second spiral pipe; 21221. Second air inlet; 21222. Second air outlet;

[0026] 22. Ignition and combustion assembly; 221. Porous diverter; 2211. Gas through hole; 2212. First end; 2213. Second end; 222. Ignition element; 223. Air duct; 23. Gas duct;

[0027] 30. Heat exchange device; 31. Boiler; 311. Flue gas inlet; 312. Flue gas outlet; 32. Steam generating assembly; 321. Economizer; 322. Water-cooling assembly; 323. Superheater; 33. Chimney; 34. Flue gas duct. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0029] Reference below Figure 1-Figure 2 The combustion device 20 for producing pyrolysis gas from biomass with low combustion efficiency according to an embodiment of the present invention is described. The combustion device 20 for producing pyrolysis gas from biomass with low combustion efficiency can be applied to the combustion system 100 for producing pyrolysis gas from biomass.

[0030] Combine Figure 1-Figure 2 As shown, the combustion device 20 for the pyrolysis gas of difficult-to-burn biomass according to the present invention can mainly include: an ignition combustion component 22 and a gas mixing pipe 21, the gas mixing pipe 21 includes a spiral collision tube 212, the spiral collision tube 212 includes a first spiral tube 2121 and a second spiral tube 2122, the first spiral tube 2121 and the second spiral tube 2122 are both spirally arranged and have opposite spiral directions, the upper and lower ends of the first spiral tube 2121 are respectively provided with a first air inlet 21211 and a first air outlet 21212, the upper and lower ends of the second spiral tube 2122 are respectively provided with a second air inlet 21221 and a second air outlet 21222, the first air inlet 21211 and the second air inlet 21221 are respectively connected to the pyrolysis gas and the fuel gas, the first air outlet 21212 and the second air outlet 21222 are radially opposite to each other, and the ignition combustion component 22 is arranged above the gas mixing pipe 21 and is connected to the gas mixing pipe 21.

[0031] Specifically, the pyrolysis gas enters the first spiral tube 2121 through the first air inlet 21211, and the fuel gas enters the second spiral tube 2122 through the second air inlet 21221. The first spiral tube 2121 and the second spiral tube 2122 are both spirally arranged, and the spiral directions of the first spiral tube 2121 and the second spiral tube 2122 are opposite, so that the first gas outlet 21212 of the first spiral tube 2121 and the second gas outlet 21222 of the second spiral tube 2122 are radially opposite to each other. In this way, the pyrolysis gas with a lower calorific value in the first spiral tube 2121 can collide with the gas with a higher calorific value flowing out of the first gas outlet 21212 of the second spiral tube 2122 when it flows out from the first gas outlet 21212, so that the two form a strong turbulent confrontation, which can greatly enhance the mixing effect of the gas and the pyrolysis gas. With such an arrangement, after the mixed gas of the gas and the pyrolysis gas enters the ignition combustion component 22, the mixed gas of the gas and the pyrolysis gas is more likely to burn, which can reduce the combustion difficulty of the pyrolysis gas.

[0032] Combine Figure 2 As shown, the gas mixing pipe 21 can also mainly include an auxiliary combustion straight pipe 211, which extends in the up and down directions and is respectively provided with a third air inlet 2111 and a third air outlet 2112 at both ends in the up and down directions. The third air inlet 2111 is respectively connected to the pyrolysis gas and the fuel gas. The first spiral tube 2121 and the second spiral tube 2122 are both spirally arranged on the outside of the auxiliary combustion straight pipe 211, and the first air outlet 21212 and the second air outlet 21222 are both located above the third air outlet 2112 and are respectively arranged on both sides of the radial direction of the third air outlet 2112.

[0033] Specifically, since the air flow direction of the mixed gas of the fuel gas and the pyrolysis gas after the collision is not uniform, it may diffuse in all directions and cannot quickly and directly enter the ignition combustion component 22 to be burned. Therefore, by setting the first air outlet 21212 and the second air outlet 21222 above the third air outlet 2112, and making the first air outlet 21212 and the second air outlet 21222 relatively arranged on the radial sides of the third air outlet 2112, the position where the pyrolysis gas and fuel gas in the first air outlet 21212 and the second air outlet 21222 collide can be located near the top of the third air outlet 2112. In this way, when the mixed gas of the fuel gas and the pyrolysis gas flowing out of the third air outlet 2112 flows upward, it can directly and effectively drive the mixed gas of the fuel gas and the pyrolysis gas flowing out of the first air outlet 21212 and the second air outlet 21222 and colliding to flow upward and enter the ignition combustion component 22 to be burned.

[0034] With such arrangement, on the one hand, since the pyrolysis gas and fuel gas are introduced into the third air inlet 2111 of the auxiliary combustion straight pipe 211, the pyrolysis gas and fuel gas can be fully mixed while flowing upward in the auxiliary combustion straight pipe 211, so that the third air outlet 2112 can flow out of the mixed gas of pyrolysis gas and fuel gas that is already relatively fully mixed, which can further improve the mixing effect of the mixed gas of fuel gas and pyrolysis gas entering the ignition combustion component 22. On the other hand, the gas flowing out of the third air outlet 2112 can better guide the gas flowing out of the first air outlet 21212 and the second air outlet 21222 upward, which can further improve the efficiency of the gas in the gas mixing pipe 21 entering the ignition combustion component 22, thereby improving the self-sustaining combustion capability of the combustion system 100.

[0035] It should be noted that if the first air outlet 21212 and the second air outlet 21222 are flush with the third air outlet 2112, the gas flowing out of the first air outlet 21212 and the second air outlet 21222 will collide at the third air outlet 2112. The air pressure generated by the gas flowing out of the first air outlet 21212 and the second air outlet 21222 may not only hinder the air outflow from the third air outlet 2112, but also cause airflow turbulence and even generate loud noise.

[0036] In addition, if the first air outlet 21212 and the second air outlet 21222 are lower than the third air outlet 2112, since the mixed gas flowing out of the third air outlet 2112 flows upward, the gas flowing out of the third air outlet 2112 will not be able to drive the gas flowing out of the first air outlet 21212 and the second air outlet 21222 to flow upward, or the gas flowing out of the third air outlet 2112 will only be able to drive a small part of the gas flowing out of the first air outlet 21212 and the second air outlet 21222 to flow upward, affecting the combustion efficiency of the ignition combustion component 22.

[0037] Furthermore, due to the high calorific value of natural gas, the mixing of natural gas and pyrolysis gas can improve the combustion stability of the pyrolysis gas, thereby improving the combustion utilization rate of the pyrolysis gas. Moreover, due to the relatively low cost of natural gas, the cost of the combustion system 100 will not be increased excessively. It should be noted that the mixing ratio of natural gas and pyrolysis gas can be adjusted according to demand.

[0038] Combine Figure 1 and Figure 2 As shown, the ignition and combustion assembly 22 includes a porous diverter 221, an ignition component 222 and an air duct 223. A plurality of gas through holes 2211 are provided in the porous diverter 221. The porous diverter 221 is respectively connected to the gas mixing duct 21 and the air duct 223. The ignition component 222 is provided on the lower side of the porous diverter 221.

[0039] Specifically, the porous diverter 221 is connected to the gas mixing pipe 21 and the air pipe 223 respectively. The mixed gas of pyrolysis gas and fuel gas flows upward from the gas outlet of the gas mixing pipe 21 to the porous diverter 221. The mixed gas of pyrolysis gas and fuel gas gradually diffuses in the porous diverter 221. The porous diverter 221 is also connected to the air pipe 223. The air in the air pipe 223 enters the porous diverter 221. The air gradually diffuses in the porous diverter 221. The air and the mixed gas of pyrolysis gas and fuel gas contact and mix in the porous diverter 221. The multiple gas through holes 2211 can not only ensure that the mixture of pyrolysis gas and fuel gas and air flow stably and mix in the porous diverter 221, but also reduce the flow speed of the mixture of pyrolysis gas and fuel gas and air, thereby increasing the contact and mixing time and area of the mixture of pyrolysis gas and fuel gas and air. In this way, after the ignition element 222 ignites the mixture of pyrolysis gas and fuel gas that has been fully contacted and mixed with the air, the mixture of pyrolysis gas and fuel gas can be ignited more fully, which can further improve the energy utilization rate of the pyrolysis gas.

[0040] In some embodiments of the present invention, the porous diverter 221 can be made of ceramic fiber. By opening holes in the ceramic fiber, a plurality of gas through holes 2211 can be formed in the ceramic fiber. The ceramic fiber has high thermal stability, and the structure remains stable even after a long period of high-temperature combustion, which can improve the structural reliability of the porous diverter 221 and the service life of the porous diverter 221.

[0041] In addition, in some embodiments of the present invention, the ignition element 222 can be disposed on the lower side of the porous diverter element 221 , which can further ensure the ignition and combustion effect of the ignition element 222 .

[0042] Combine Figure 1 and Figure 2 As shown, the two ends of the porous diverter 221 in the length direction are set as the first end 2212 and the second end 2213 respectively. The first end 2212 is closer to the gas mixing pipe 21 and is connected to the gas mixing pipe 21. The air pipe 223 is connected to the second end 2213. In the direction from the first end 2212 to the second end 2213, the aperture of the gas through hole 2211 gradually decreases.

[0043] Specifically, by setting the gas through hole 2211 of the first end 2212 of the porous diverter 221 adjacent to the gas mixing pipe 21 to be relatively large, and setting the gas through hole 2211 of the second end 2213 of the porous diverter 221 adjacent to the air pipe 223 to be relatively small, and gradually reducing the aperture of the gas through hole 2211 in the direction from the first end 2212 to the second end 2213, with such a setting, on the one hand, after the gas mixing pipe 21 discharges gas to the first end 2212 of the porous diverter 221, since the aperture of the gas through hole 2211 in the first end 2212 is relatively large, the gas can more easily enter the porous diverter 221 from the first end 2212, and the gas will not flow back downward due to the small aperture of the gas through hole 2211 and cannot smoothly enter the porous diverter 221.

[0044] Furthermore, since the aperture of the gas through hole 2211 gradually decreases from the first end 2212 to the second end 2213, the flow rate of the mixed gas of pyrolysis gas and fuel gas in the porous diverter 221 can be further reduced, thereby further improving the completeness of the contact and mixing between the mixed gas of pyrolysis gas and fuel gas and air, and further improving the completeness of the combustion of the mixed gas of pyrolysis gas and fuel gas, and further improving the energy utilization rate of the pyrolysis gas.

[0045] It should be noted that although the air duct 223 is connected to the second end 2213 of the porous diverter 221, and the aperture of the gas through hole 2211 at the second end 2213 is relatively small, a device for driving the air flow and accelerating the air flow speed can be provided in the air duct 223 to ensure the stability and smoothness of the air in the air duct 223 entering the porous diverter 221.

[0046] In addition, in some other embodiments of the present invention, the connection between the air duct 223 and the porous diverter 221 may not be at the second end 2213, that is, the connection between the air duct 223 and the porous diverter 221 may be located between the first end 2212 and the second end 2213.

[0047] Combine Figure 1 As shown, the combustion system 100 of biomass pyrolysis gas according to an embodiment of the present invention may mainly include: a combustion device 20, a pyrolysis device 10 and a heat exchange device 30, wherein the pyrolysis device 10 is provided with a pyrolysis gas outlet 1321, and the pyrolysis gas outlet 1321 is respectively connected to the first air inlet 21211 and the third air inlet 2111, and the heat exchange device 30 includes a boiler 31 and a steam generating component 32, and the boiler 31 is respectively connected to the ignition combustion component 22 and the pyrolysis device 10, and the steam generating component 32 is arranged in the boiler 31 to exchange heat with the high-temperature flue gas generated by the combustion of the ignition combustion component 22 to generate superheated steam.

[0048] Specifically, the pyrolysis equipment 10 can pyrolyze the incoming biomass material to generate biomass pyrolysis gas, which flows out from the pyrolysis gas outlet 1321, and a part of the biomass pyrolysis gas flowing out from the pyrolysis gas outlet 1321 enters the first air inlet 2111 of the auxiliary combustion straight pipe 211, and the other part enters the second air inlet 21211 of the first spiral tube 2121, and flows out from the first air outlet 21212 and the second air outlet 21222 and then collides and mixes. After the ignition combustion component 22 burns the mixed gas of pyrolysis gas and fuel gas, high-temperature flue gas will be produced. The high-temperature flue gas can enter the boiler 31, and a part of the high-temperature flue gas in the boiler 31 will enter the pyrolysis device 10, which can provide the pyrolysis device 10 with a hot air flow for pyrolyzing biomass, thereby avoiding the need to set up additional heating components to provide heat to the pyrolysis device 10, further simplifying the structural design of the combustion system 100, and reducing the cost of the combustion system 100.

[0049] In addition, by arranging the steam generating component 32 in the boiler 31, the steam generating component 32 can exchange heat with the high-temperature flue gas in the boiler 31 to produce steam for power generation, thereby achieving the purpose of the combustion system 100 to convert biomass pyrolysis gas into electrical energy. By directly arranging the steam generating component 32 in the boiler 31, it is possible to avoid setting up a pipe to guide the flow of flue gas to guide the high-temperature flue gas in the boiler 31 to the steam generating component 32. In this way, the utilization rate of the high-temperature flue gas can be ensured after the mixed gas of pyrolysis gas and fuel gas is burned to generate high-temperature flue gas, the long flow path of the high-temperature flue gas and the high loss can be reduced, and the structural design of the combustion system 100 can be further simplified.

[0050] In other embodiments of the present invention, the boiler 31 may also be a heating boiler, which may utilize high-temperature flue gas to provide heating.

[0051] Thus, the pyrolysis gas and gas mixture flowing out from the third gas outlet 2112 can flow out from the first gas outlet 21212 and the second gas outlet 21222, and the pyrolysis gas and gas mixture after collision flows upward, which not only forms a strong turbulent confrontation, greatly enhances the mixing effect of the pyrolysis gas and gas, but also makes the pyrolysis gas and gas mixture burn more fully and stably after entering the ignition combustion component 22, thereby improving the utilization rate of biomass pyrolysis gas, improving the self-sustaining combustion ability of the combustion system 100, and the structure of the combustion system 100 is relatively simple, which will not excessively increase the cost of the combustion system 100.

[0052] In addition, since the boiler 31 of the heat exchange device 30 is connected to the pyrolysis device 10, the high-temperature flue gas in the boiler 31 will enter the pyrolysis device 10 to provide the required hot air flow for the pyrolysis of the pyrolysis device 10, and there is no need to set up an additional device to provide heat to the pyrolysis device 10.

[0053] Combine Figure 1 As shown, the air duct 223 is at least partially disposed in the boiler 31 so that the hot flue gas in the boiler 31 preheats the air duct 223. Specifically, by disposing the air duct 223 at least partially in the boiler 31, the high-temperature flue gas in the boiler 31 can preheat the air duct 223, thereby preheating the air in the air duct 223. After the air contacts and mixes with the mixture of pyrolysis gas and fuel gas, the mixture of pyrolysis gas and fuel gas can be preheated. This can increase the initial temperature of the mixture of pyrolysis gas and fuel gas before combustion, thereby making the combustion of the mixture of pyrolysis gas and fuel gas easier and more flammable, and further improving the completeness of the combustion of the mixture of pyrolysis gas and fuel gas, thereby further improving the energy utilization rate of the pyrolysis gas.

[0054] In some embodiments of the present invention, a heat storage element may be further provided in the air duct 223. The heat storage element may store heat in the air duct 223, so that the heat storage element may further heat the air in the air duct 223 under the premise that the high-temperature flue gas preheats the air in the air duct 223, thereby further increasing the temperature of the air in the air duct 223 and further improving the completeness of the combustion of the mixed gas of pyrolysis gas and fuel gas.

[0055] Combine Figure 1 As shown, the gas pipeline 23 is at least partially disposed in the boiler 31 so that the hot flue gas in the boiler 31 preheats the gas pipeline 23. Specifically, by disposing the gas pipeline 23 at least partially in the boiler 31, the high-temperature flue gas in the boiler 31 can preheat the gas pipeline 23, thereby preheating the gas in the gas pipeline 23. Furthermore, after the pyrolysis gas and the gas are contacted and mixed, the pyrolysis gas can be preheated, thereby increasing the initial temperature of the mixed gas of pyrolysis gas and gas before combustion. This not only makes the combustion of the mixed gas of pyrolysis gas and gas easier and more flammable, but also further improves the sufficiency of the combustion of the mixed gas of pyrolysis gas and gas, thereby further improving the energy utilization rate of the pyrolysis gas.

[0056] Combine Figure 1 As shown, the heat exchange device 30 also includes a chimney 33, and the boiler 31 has a flue gas inlet 311 and a flue gas outlet 312. The flue gas inlet 311 is connected to the ignition combustion component 22, and the flue gas outlet 312 is connected to the chimney 33. The air duct 223 and the gas duct 23 are both arranged near the flue gas outlet 312. Compared with the air duct 223 and / or the gas duct 23, the steam generating component 32 is closer to the flue gas inlet 311.

[0057] Specifically, by arranging the steam generating component 32 closer to the flue gas inlet 311, the high-temperature flue gas generated by the mixture of pyrolysis gas and fuel gas after combustion can first exchange heat with the steam generating component 32 after entering the boiler 31. This can ensure the reliability of the heat exchange between the high-temperature flue gas and the steam generating component 32, and prevent the high-temperature gas from exchanging heat with the steam generating component 32 only after a large amount of heat loss, resulting in insufficient heat of the high-temperature flue gas during heat exchange with the steam generating component 32, and inability to generate enough steam for power generation. This can further improve the reliability of the heat exchange device 30.

[0058] It should be noted that since the high-temperature flue gas in the boiler 31 only needs to preheat the gas in the gas pipe 23 and the air in the air pipe 223, the gas pipe 23 and the air pipe 223 do not have high requirements for the heat in the high-temperature flue gas in the boiler 31. Therefore, the high-temperature flue gas can first be heat-exchanged with the steam generating component 32 to ensure that the amount of steam generated by the steam generating component 32 is sufficient, and then the remaining heat is used to preheat the gas in the gas pipe 23 and the air in the air pipe 223. This can make the heat distribution of the high-temperature flue gas in the boiler 31 more reasonable, and on the premise of ensuring that the steam generating component 32, the gas pipe 23 and the air pipe 223 can all work stably, the performance of the combustion system 100 can be further improved.

[0059] In some embodiments of the present invention, the air duct 223 is closer to the flue gas inlet 311 than the gas duct 23. That is, the air duct 223 is located between the gas duct 23 and the steam generation assembly 32. The preheating of the pyrolysis gas and gas mixture prior to final combustion is achieved by mixing with the preheated air. Therefore, by placing the air duct 223 closer to the flue gas inlet 311 than the gas duct 23, the high-temperature flue gas exchanges heat with the steam generation assembly 32, then with the air duct 223, and finally with the gas duct 23. The heat content of the high-temperature flue gas exchanged with the air duct 223 is greater than that of the high-temperature flue gas exchanged with the gas duct 23. This results in a relatively high temperature for the air in the air duct 223, enabling the preheating of the pyrolysis gas and gas mixture by the preheated air to be more effective. Furthermore, after the air contacts and mixes with the pyrolysis gas and gas mixture, it is directly combusted by the ignition element 222 without having to flow elsewhere, resulting in minimal heat loss.

[0060] It should be noted that since the gas pipeline 23 is mixed with the pyrolysis gas through the gas mixing pipeline 21, even if the temperature of the gas in the gas pipeline 23 is high, a large amount of heat will be lost after flowing over a long distance in the gas mixing pipeline 21 and the porous diverter 221. Therefore, the temperature of the gas does not need to be high. That is, if the temperature of the gas is high, the heat loss will also be relatively large. It is more reasonable to set the gas pipeline 23 closer to the flue gas outlet 312 and the air pipeline 223 closer to the flue gas inlet 311. This can ensure that the preheating temperature of the mixture of pyrolysis gas and gas before the final combustion is relatively high, which can further reduce the combustion difficulty of the mixture of pyrolysis gas and gas, and can further improve the combustion completeness of the mixture of pyrolysis gas and gas.

[0061] Furthermore, by providing a chimney 33 at the flue gas outlet 312, the pressure inside the boiler 31 can be kept stable, and high-temperature flue gas can be continuously introduced into the boiler 31, thereby preventing the high-temperature flue gas from flowing back.

[0062] Combine Figure 1 As shown, the steam generating assembly 32 includes a coal-saving component 321, a water-cooling component 322 and a superheating component 323. A supercooling water inlet is provided at one end of the coal-saving component 321 to allow the hot flue gas in the boiler 31 to exchange heat with the supercooled water in the coal-saving component 321. The other end of the coal-saving component 321 is connected to the water cooler so that the supercooled water after heat exchange forms saturated steam in the water-cooling component 322. The water-cooled wall is connected to the superheating component 323 so that the saturated steam forms superheated steam for power generation in the superheating component 323.

[0063] Specifically, by introducing supercooled water into economizer 321, the high-temperature flue gas within boiler 31 can exchange heat with the supercooled water in economizer 321. The supercooled water then enters water-cooled element 322, where it exchanges heat with water-cooled element 322 to form saturated steam. The saturated steam and the water that has not yet become saturated steam enter the steam cylinder, which separates the saturated steam from the water that has not yet become saturated steam. The water that has not yet become saturated steam flows back to water-cooled element 322, and the saturated steam flows through the steam cylinder to superheater 323. The saturated steam flowing through superheater 323 exchanges heat with the high-temperature flue gas within boiler 31, ultimately forming superheated steam. The superheated steam can be used to generate electricity and provide the thermal energy required for power generation. This arrangement not only simplifies the structure of steam generation assembly 32, but also reduces the cost of power generation and achieves good energy-saving effects.

[0064] In some embodiments of the present invention, superheated steam enters the steam turbine through a pipeline. When the superheated steam expands, the thermal energy in the superheated steam is converted into kinetic energy, which drives the turbine blades of the steam turbine to rotate at high speed. The turbine blades of the steam turbine are coaxially connected to the generator rotor. The rotation of the turbine blades drives the generator rotor to rotate in the magnetic field, cutting the magnetic lines of force to generate alternating current.

[0065] Combine Figure 1 As shown, the pyrolysis device 10 includes a feed bin 11, a pyrolysis furnace 12 and a separation component 13. The pyrolysis furnace 12 has a feed end and a discharge end. The feed bin 11 is connected to the feed end, and the separation component 13 is connected to the discharge end. The separation component 13 is suitable for separating the pyrolysis gas and the unpyrolyzed material flowing out of the discharge end, and the pyrolysis gas outlet 1321 is set on the separation component 13.

[0066] Specifically, in some embodiments of the present invention, the unpyrolyzed material can be biomass. By arranging the biomass in the feed bin 11 and making the feed bin 11 communicate with the feed end, the feed bin 11 can selectively feed the pyrolysis furnace 12 through the feed end. The pyrolysis furnace 12 can pyrolyze the biomass. Most of the biomass is pyrolyzed to generate pyrolysis gas. However, there is still some unpyrolyzed biomass in the pyrolysis furnace 12. The pyrolysis gas and the unpyrolyzed biomass flow out from the discharge end and pass through the separation component 13. The separation component 13 can separate the pyrolysis gas and the unpyrolyzed biomass, and the pyrolysis gas outlet 1321 The separation component 13 is arranged to discharge the separated pyrolysis gas from the pyrolysis gas outlet 1321 to the gas mixing pipe 21 of the combustion device 20, so as to prevent the unpyrolyzed biomass from entering the gas mixing pipe 21 together with the pyrolysis gas. On the one hand, larger particles of unpyrolyzed biomass are easy to clog the gas mixing pipe 21 and affect the mixing of the gases in the gas mixing pipe 21. On the other hand, the unpyrolyzed biomass will also affect the combustion of the mixed gas of pyrolysis gas and fuel gas, which will reduce the combustion efficiency of the pyrolysis gas. In this way, the reliability of the biomass pyrolysis gas combustion system 100 can be further improved.

[0067] Combine Figure 1 As shown, the separation component 13 includes a separation element 131, a pyrolysis gas pipeline 132 and a return pipeline 133. The separation element 131 is suitable for separating the pyrolysis gas and the unpyrolyzed material flowing out from the discharge end. One end of the pyrolysis gas pipeline 132 and one end of the return pipeline 133 are respectively connected to the separation element 131, and the other end of the return pipeline 133 is connected to the feed end. A pyrolysis gas outlet 1321 is provided at the other end of one end of the pyrolysis gas pipeline 132.

[0068] Specifically, the separation component 131 can separate the pyrolysis gas and the unpyrolyzed biomass, and allow the pyrolysis gas to flow to the pyrolysis gas outlet 1321 through the pyrolysis gas pipe 132, so that the unpyrolyzed biomass is separated and re-enters the pyrolysis furnace 12 through the return pipe 133 to be pyrolyzed again. In this way, under the premise of ensuring that the separation component 13 can stably separate the pyrolysis gas and the unpyrolyzed biomass, the unpyrolyzed biomass can be fully utilized to prevent the waste of the unpyrolyzed biomass, which can further improve the utilization rate of the biomass.

[0069] It should be noted that the return pipe 133 can extend in the up and down directions, so that after the separation component 13 separates the pyrolysis gas and the unpyrolyzed biomass, the unpyrolyzed biomass can be directly returned to the pyrolysis furnace 12 under the action of its own gravity, without the need to set up additional devices to drive the unpyrolyzed biomass back to the pyrolysis furnace 12, which can further simplify the structural design of the separation component 13.

[0070] In some embodiments of the present invention, the separator 131 can be a filter element. The particles of unpyrolyzed biomass are larger than those of pyrolysis gas. By opening filter holes with smaller pore sizes on the filter element, the pyrolysis gas can pass through the filter holes, and the unpyrolyzed biomass cannot pass through the filter holes, thereby achieving the separation of the unpyrolyzed biomass and the pyrolysis gas. This not only ensures the reliability of the separation of the unpyrolyzed biomass and the pyrolysis gas, but also simplifies the structural design of the separator 131.

[0071] Combine Figure 1 As shown, the biomass pyrolysis gas combustion system 100 can also mainly include a purification device 14, which includes a water removal component 141 and / or a dust removal component 142. The water removal component 141 and / or the dust removal component 142 are arranged in the pyrolysis gas pipeline 132 and are located between the two ends of the pyrolysis gas pipeline 132.

[0072] Specifically, by arranging the purification device 14 in the pyrolysis gas pipeline 132, and making the purification device 14 located between the two ends of the pyrolysis gas pipeline 132, that is, before the pyrolysis gas is separated by the separation element 131 and enters the pyrolysis gas pipeline 132, and before it flows out from the pyrolysis gas outlet 1321, the foreign matter in the pyrolysis gas can be removed by purification by the purification device 14, thereby improving the purity of the pyrolysis gas, and then improving the combustion efficiency of the pyrolysis gas, which can improve the energy utilization efficiency of the biomass pyrolysis gas.

[0073] Furthermore, the purification device 14 includes a water removal component 141 and / or a dust removal component 142, and the water removal component 141 and / or the dust removal component 142 are arranged in the pyrolysis gas pipeline 132, and the water removal component 141 and / or the dust removal component 142 can be located between the two ends of the pyrolysis gas pipeline 132. The water removal component 141 can remove moisture from the pyrolysis gas, and the dust removal component 142 can remove dust and debris from the pyrolysis gas. This can further improve the purification effect of the purification device 14 on the pyrolysis gas, further improve the purity of the pyrolysis gas, and further improve the combustion efficiency of the pyrolysis gas, and further improve the energy utilization efficiency of the biomass pyrolysis gas.

[0074] Combine Figure 1As shown, the heat exchange device 30 also includes a flue gas duct 34. The pyrolysis furnace 12 is provided with a flue gas inlet. One end of the flue gas duct 34 is connected to the inside of the boiler 31, and the other end is connected to the flue gas inlet to provide the pyrolysis furnace 12 with a hot air flow for pyrolysis.

[0075] Specifically, by connecting one end of the flue gas duct 34 to the interior of the boiler 31 and the other end to the flue gas inlet, high-temperature flue gas can enter the pyrolysis furnace 12 through the flue gas duct 34, thereby providing a hot air flow for the pyrolysis furnace 12 to pyrolyze the biomass. This can improve the stability and reliability of the flow of high-temperature flue gas from the interior of the boiler 31 to the pyrolysis furnace 12. In addition, by adjusting the diameter of the flue gas duct 34, the amount of high-temperature flue gas in the boiler 31 that enters the pyrolysis furnace 12 through the flue gas duct 34 can be adjusted, thereby achieving heat allocation within the boiler 31.

[0076] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the invention.

[0077] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A combustion device for pyrolysis gas from flame-retardant biomass, characterized in that: include: Ignition and combustion components; A gas mixing pipe, the gas mixing pipe comprising a first spiral pipe and a second spiral pipe, the first spiral pipe and the second spiral pipe are both spirally arranged and spiral in opposite directions, the first spiral pipe is provided with a first air inlet and a first air outlet at the upper and lower ends respectively, the second spiral pipe is provided with a second air inlet and a second air outlet at the upper and lower ends respectively, the first air inlet and the second air inlet are connected to the pyrolysis gas and the fuel gas respectively; The first air outlet and the second air outlet are arranged opposite to each other in the radial direction, and the ignition and combustion assembly is arranged above the gas mixing pipe and is connected to the gas mixing pipe.

2. The combustion device for pyrolysis gas from flame-retardant biomass according to claim 1, characterized in that: The gas mixing pipe also includes an auxiliary combustion straight pipe, which extends in the up and down directions and is respectively provided with a third air inlet and a third air outlet at both ends in the up and down directions. The third air inlet is respectively connected to the pyrolysis gas and the fuel gas. The first spiral pipe and the second spiral pipe are both spirally arranged on the outside of the auxiliary combustion straight pipe. The first air outlet and the second air outlet are both located above the third air outlet and are respectively arranged opposite to each other on both sides of the radial direction of the third air outlet.

3. The combustion device for pyrolysis gas from flame-retardant biomass according to claim 1, characterized in that: The ignition and combustion assembly includes a porous diverter, an ignition component and an air duct. A plurality of gas through holes are provided in the porous diverter. The porous diverter is respectively connected to the gas mixing duct and the air duct. The ignition component is provided on the lower side of the porous diverter.

4. The combustion device for pyrolysis gas from flame-retardant biomass according to claim 3, characterized in that: The two ends of the porous diverter in the length direction are set to be the first end and the second end respectively, the first end is closer to the gas mixing pipe and is connected to the gas mixing pipe, the air pipe is connected to the second end, and the aperture of the gas through hole gradually decreases in the direction from the first end to the second end.

5. A biomass pyrolysis gas combustion system, characterized in that: include: The combustion device according to any one of claims 1 to 4; a pyrolysis device, wherein the pyrolysis device is provided with a pyrolysis gas outlet, and the pyrolysis gas outlet is respectively connected to the first air inlet and the third air inlet; A heat exchange device, comprising a boiler and a steam generating assembly, wherein the boiler is respectively connected to the ignition combustion assembly and the pyrolysis device, and the steam generating assembly is arranged in the boiler to exchange heat with the high-temperature flue gas generated by combustion of the ignition combustion assembly to generate superheated steam.

6. The biomass pyrolysis gas combustion system according to claim 5, characterized in that: The ignition combustion assembly includes an air duct, which is at least partially arranged in the boiler so that the hot flue gas in the boiler preheats the air duct; and / or The biomass pyrolysis gas combustion system further includes a gas pipeline, which is respectively connected to the second air inlet and the third air inlet. The gas pipeline is at least partially disposed in the boiler so that the hot flue gas in the boiler preheats the gas pipeline.

7. The biomass pyrolysis gas combustion system according to claim 5, characterized in that: The steam generating assembly includes an economizer, a water-cooling component and an overheating component. A supercooled water inlet is provided at one end of the economizer to allow the hot flue gas in the boiler to exchange heat with the supercooled water in the economizer. The other end of the economizer is connected to the water cooler so that the supercooled water after heat exchange forms saturated steam in the water-cooling component. The water-cooled wall is connected to the overheating component so that the saturated steam forms superheated steam for power generation in the overheating component.

8. The biomass pyrolysis gas combustion system according to claim 5, characterized in that: The pyrolysis device includes a feed bin, a pyrolysis furnace and a separation component. The pyrolysis furnace has a feed end and a discharge end. The feed bin is connected to the feed end, and the separation component is connected to the discharge end. The separation component is suitable for separating the pyrolysis gas and unpyrolyzed material flowing out of the discharge end, and the pyrolysis gas outlet is arranged on the separation component.

9. The biomass pyrolysis gas combustion system according to claim 8, characterized in that: The separation component includes a separation element, a pyrolysis gas pipeline and a return pipeline. The separation element is suitable for separating the pyrolysis gas and the unpyrolysis material flowing out from the discharge end. One end of the pyrolysis gas pipeline and one end of the return pipeline are respectively connected to the separation element, and the other end of the return pipeline is connected to the feed end. The other end of one end of the pyrolysis gas pipeline is provided with the pyrolysis gas outlet.

10. The biomass pyrolysis gas combustion system according to claim 9, characterized in that: It also includes a purification device, which includes a water removal component and / or a dust removal component. The water removal component and / or the dust removal component are arranged in the pyrolysis gas pipeline and located between the two ends of the pyrolysis gas pipeline.

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