US 12,253,261 B2
Low-concentration gas differential combustion device
Xiaomin Wang, Beijing (CN); and Junting Yang, Beijing (CN)
Assigned to BEIJING JUNFA COMBUSTIBLE GAS TECHNOLOGY DEVELOPMENT CO., LTD., Beijing (CN)
Appl. No. 17/626,924
Filed by BEIJING JUNFA COMBUSTIBLE GAS TECHNOLOGY DEVELOPMENT CO., LTD, Beijing (CN)
PCT Filed Oct. 17, 2019, PCT No. PCT/CN2019/111555
§ 371(c)(1), (2) Date Jan. 13, 2022,
PCT Pub. No. WO2021/012417, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 201910665478.9 (CN), filed on Jul. 23, 2019.
Prior Publication US 2022/0260251 A1, Aug. 18, 2022
Int. Cl. F23D 14/82 (2006.01); C10L 3/10 (2006.01); F23D 14/46 (2006.01); F23D 14/68 (2006.01)
CPC F23D 14/82 (2013.01) [C10L 3/106 (2013.01); F23D 14/46 (2013.01); F23D 14/68 (2013.01); C10L 2290/08 (2013.01); F23D 2209/10 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A low-concentration gas differential combustion device, comprising:
a low-concentration gas super-cooling dehydration and demisting device, a gas pretreatment device, a burner, a long-term burning open fire device, a high-energy self-heat dispersion rapid ignition device, a combustion chamber, and a waste-heat utilization device, the low-concentration gas super-cooling dehydration and demisting device is installed behind a last-stage water-sealing fire-barriering explosion-venting device of a low-concentration gas safe transport system, the low-concentration gas super-cooling dehydration and demisting device is connected to a flameout and backfire protection control device and a low-concentration gas concentration regulation device, the low-concentration gas concentration regulation device is connected to the gas pretreatment device, the gas pretreatment device is connected to the burner, the burner is connected to the combustion chamber, the combustion chamber is connected to the waste-heat utilization device, and both the long-term burning open fire device and the high-energy self-heat dispersion rapid ignition device are connected to the combustion chamber; and
wherein the gas pretreatment device comprises a gas inlet, a second capillary spiral heat exchange tube, a movable valve, a spiral duct, an intermediate medium inlet, and an intermediate medium outlet, the gas inlet is connected to the low-concentration gas concentration regulation device and installed behind the low-concentration gas concentration regulation device; the gas flows in the second capillary spiral heat exchange tube of the pretreatment device, enters the movable valve from an outlet at the other end of the second capillary spiral heat exchange tube, the gas opens the movable valve with its own pressure and enters the burner from an outlet of the spiral duct to which an outlet of the movable valve is connected; the intermediate medium inlet and the intermediate medium outlet are respectively connected to a low-temperature flue gas heat extraction device of the waste-heat utilization device, and an intermediate medium circulates between the low-temperature flue gas heat extraction device and the gas pretreatment device;
the spiral duct and the movable valve are arranged one-to-one, and the two are seamlessly connected, the outlet of each movable valve is connected to one spiral duct, an outlet of the entire gas pretreatment device is in a tube bundle structure, ventilation air and recirculating flue gas may be added to an outer side of the spiral duct; an outlet of the second capillary spiral heat exchange tube is connected to an internal movable valve, and the movable valve is automatically opened by the pressure of the gas, and automatically closed when the pressure is low to prevent an occurrence of a backfire phenomenon when the gas amount is too small or the pressure is too low.