CN215372480U - Submerged combustion type gasification device with ultralow NOx emission - Google Patents
Submerged combustion type gasification device with ultralow NOx emission Download PDFInfo
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- CN215372480U CN215372480U CN202121382166.6U CN202121382166U CN215372480U CN 215372480 U CN215372480 U CN 215372480U CN 202121382166 U CN202121382166 U CN 202121382166U CN 215372480 U CN215372480 U CN 215372480U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
An ultra-low NOx emission submerged combustion type gasification device is characterized by comprising a main fan, a main burner, a flue gas distributor, a water tank, a gasification pipe bundle and the like, wherein the main fan (1) is connected with the main burner (2) and an auxiliary burner (8), and the main burner (2) is connected with the flue gas distributor (3); the main burner (2), the gasification tube bundle (5) and the auxiliary burner (8) are arranged in the water tank (4); the smoke distributor (3) is arranged at the bottom of the water tank (4); the chimney (7) is connected with the top of the water tank (4); the outlets of the chimney (7) and the auxiliary burner (8) are connected with the gas mixer (9); the gas mixer (9), the denitration reactor (10), the heat exchanger (11), the induced draft fan (12) and the scrubber (13) are sequentially connected, and a reducing agent system is arranged in front of the gas mixer (9) or the denitration reactor (10). The utility model has low nitrogen oxide emission, energy saving and environmental protection.
Description
Technical Field
The utility model relates to a liquefied natural gas gasification technology, in particular to a gasifier technology, and specifically relates to an ultra-low NOx emission submerged combustion type gasification device.
Background
In recent years, as the demand for natural gas energy increases, the demand for Liquefied Natural Gas (LNG) gasification also increases. The submerged combustion type gasifier is an important form of the liquefied natural gas gasifier, which heats water by using high-temperature flue gas generated by combustion of fuel gas, gasifies LNG in a gasification tube bundle into Natural Gas (NG) by using hot water, and then outputs the natural gas from the gasifier.
Nitrogen oxides (NOx) are one of the main pollutants of the atmosphere and cause physical health, environmental ecology and social production activities of human beingsSerious harm is caused, and the smoke generated by industrial activities needs to be subjected to pollutant purification treatment before being allowed to be discharged. At present, the emission limit of NOx in countries of the world is more and more strict, and the emission limit of NOx in a newly-built plant area is 100mg/m according to the emission standard of atmospheric pollutants of thermal power plants which is exported in 2012 of China3(ii) a Chinese' plan for actions of energy conservation, emission reduction, upgrade and modification of coal and electricity (2014-2020) proposes that the emission concentration of atmospheric pollutants of newly-built coal-fired power generating units reaches the emission limit value of gas turbine units basically, namely the emission concentration of NOx is respectively less than or equal to 50mg/m under the condition that the reference oxygen content is 6 percent3. The local standard promulgated after 2015 is especially strict in the boiler industry, and Shanghai and Tianjin allow NOXEmission limits of 50mg/m, respectively3、80mg/m3The most stringent requirement for NO in Beijing and HebeiXEmission limit of 30mg/m3. Such strict emission standards are difficult to meet by only pre-treating or improving the combustion process, and thus, post-treating the flue gas is very important.
Patent application numbers CN201520739797.7 "high efficiency submerged combustion gasifier", application numbers cn201420646916.x "liquefied natural gas submerged combustion gasifier", application numbers CN201510290223.0 "an improved submerged combustion LNG gasifier", application numbers cn201910363316.x "submerged combustion gasifier and monitoring system thereof", application numbers CN201310627874.5 "control system and control method of LNG submerged combustion gasifier" and the like require the submerged combustion gasifier from the aspects of structural arrangement, combustion organization, system control and the like, and do not mention the denitration treatment of combustion flue gas. Although the application number CN202020542738.1 immersion combustion type gasifier with low nitrogen oxide emission carries out aftertreatment on the flue gas, the problems of insensitive control and no deep utilization of the flue gas waste heat after denitration exist.
SUMMERY OF THE UTILITY MODEL
Aiming at the problem that a large amount of nitrogen oxides are generated in the current liquefied natural gas gasification process to pollute the environment, the utility model designs the ultra-low NOx emission submerged combustion type gasification device.
The technical scheme of the utility model is as follows:
1. an ultra-low NOx emission submerged combustion type gasification device is characterized by comprising a main fan 1, a main burner 2, a flue gas distributor 3, a water tank 4, a gasification tube bundle 5, a chimney 7, an auxiliary burner 8, a gas mixer 9, a denitration reactor 10, a heat exchanger 11, an induced draft fan 12 and a scrubber 13; the main fan 1 is connected with the main burner 2 and the auxiliary burner 8, and the main burner 2 is connected with the smoke distributor 3; the main burner 2, the gasification tube bundle 5 and the auxiliary burner 8 are arranged in the water tank 4; the flue gas distributor 3 is arranged at the bottom of the water tank 4; the chimney 7 is connected with the top of the water tank 4; the outlets of the chimney 7 and the auxiliary burner 8 are connected with a gas mixer 9; the gas mixer 9, the denitration reactor 10, the heat exchanger 11, the induced draft fan 12 and the scrubber 13 are connected in sequence, and a reducing agent system is arranged in front of the gas mixer 9 or the denitration reactor 10. The auxiliary burner 8 is arranged in the water tank 4 or outside the water tank 4, when the auxiliary burner 8 is arranged outside the water tank 4, a water jacket 15 is arranged outside the auxiliary burner 8, and the water inlet and the water outlet of the water jacket 15 are communicated with the water tank 4.
And the water from the water tank 4 flows into two paths, wherein one path of water enters the heat exchanger 11, and the other path of water enters the gas washing tower 13 and returns to the water tank 4 after heat exchange and gas washing.
Liquefied Natural Gas (LNG) enters from the inlet of the gasification tube bundle 5, absorbs heat through the gasification tube bundle 5, is gasified and changed into natural gas NG, and then flows out from the outlet of the gasification tube bundle 5.
The gasification tube bundle 5 adopts a threaded tube and an internal-wave external-threaded tube, and the materials are stainless steel or titanium alloy steel.
The bottom of the chimney 7 is provided with a No. 1 demister 6.
The outlet of the scrubber tower 13 is provided with a # 2 demister 14.
Alternatively, the auxiliary burner 8 may be disposed outside the water tank 4, and a water jacket 15 may be disposed outside the auxiliary burner 8, and an inlet and an outlet of the water jacket 15 are connected to the water tank 4.
The reducing agent system comprises a storage system, a delivery system and an injection system, wherein the reducing agent adopts double fuzzy control, predictive feedforward control andthe fitting optimization algorithm integrated control system is used for controlling, the reducing agent input amount is always kept to be matched with the equipment operation condition, and NO is realizedXAnd ammonia slip dual control targets.
The denitration reducing agent is injected into the medium-temperature flue gas before the gas mixer 9 or the denitration reactor 10, and then enters the denitration reactor 10 together with the flue gas to react under the action of the catalyst to remove nitrogen oxides. A reducing agent system is arranged in front of the gas mixer 9 or the denitration reactor 10 and comprises a storage system, a conveying system and an injection system, the reducing agent can be controlled by a dual fuzzy control, predictive feedforward control and fitting optimization algorithm integrated control system, the input amount of the reducing agent is always kept to be matched with the operation condition of equipment, and NO is realizedXAnd ammonia slip dual control targets.
Combustible gas and air are combusted in the main burner, the generated high-temperature flue gas enters the water in the water tank through the flue gas distributor to directly heat the water, and the flue gas is cooled to normal temperature by the water and then discharged from a chimney; liquefied Natural Gas (LNG) absorbs heat in water through a gasification tube bundle arranged in the water and is gasified into Natural Gas (NG) which is conveyed to a pipe network; high-temperature flue gas generated by combustion of the auxiliary burner and low-temperature flue gas coming out of the chimney are mixed in the gas mixer to form medium-temperature flue gas, the medium-temperature flue gas reacts in the denitration reactor to remove nitrogen oxides in the flue gas, the medium-temperature flue gas after nitrogen oxides removal exchanges heat with water from the water tank in the heat exchanger to primarily reduce the temperature, the medium-temperature flue gas enters the gas washing tower to further reduce the temperature to normal temperature and then is discharged from the top of the tower, hot water in the heat exchanger and the gas washing tower returns to the water tank, and heat is transferred to liquefied natural gas through the gasification tube bundle.
The utility model has the beneficial effects that:
by arranging the flue gas denitration device and the waste heat recovery device, the denitration problem of the flue gas is solved, the waste heat of the denitrated flue gas is deeply utilized, and the purposes of energy conservation and environmental protection are achieved.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a second schematic structural diagram of the present invention.
In the figure: the system comprises a main fan 1, a main burner 2, a flue gas distributor 3, a water tank 4, a gasification tube bundle 5, a demister 6-1, a chimney 7, an auxiliary burner 8, a gas mixer 9, a denitration reactor 10, a heat exchanger 11, a draught fan 12, a scrubbing tower 13 and a demister 14-2.
Detailed Description
The utility model is further illustrated by the following structural figures and examples.
The first embodiment.
As shown in fig. 1.
An ultra-low NOx emission submerged combustion type gasification device. The device is characterized by comprising a main fan 1, a main burner 2, a flue gas distributor 3, a water tank 4, a gasification tube bundle 5, a No. 1 demister 6, a chimney 7, an auxiliary burner 8, a gas mixer 9, a denitration reactor 10, a heat exchanger 11, an induced draft fan 12, a scrubbing tower 13 and a No. 2 demister 14. The gasification tube bundle 5 can adopt a threaded tube and an internal wave external threaded tube, and the materials are stainless steel or titanium alloy steel and the like; the heat exchanger 11 may be a special tube bundle such as a finned tube. The main fan 1 is connected with the main burner 2 and the auxiliary burner 8, the auxiliary burner 8 is arranged in the water tank 4, and the main burner 2 is connected with the smoke distributor 3; the main burner 2, the gasification tube bundle 5 and the auxiliary burner 8 are arranged in the water tank 4; the flue gas distributor 3 is arranged at the bottom of the water tank 4; the chimney 7 is connected with the top of the water tank 4; the outlets of the chimney 7 and the auxiliary burner 8 are connected with a gas mixer 9; the gas mixer 9, the denitration reactor 10, the heat exchanger 11, the induced draft fan 12 and the scrubber 13 are connected in sequence, and a reducing agent system is arranged in front of the gas mixer 9 or the denitration reactor 10. And the water from the water tank 4 flows into two paths, wherein one path of water enters the heat exchanger 11, and the other path of water enters the gas washing tower 13 and returns to the water tank 4 after heat exchange and gas washing. Liquefied Natural Gas (LNG) enters from the inlet of the gasification tube bundle 5, absorbs heat through the gasification tube bundle 5, is gasified and changed into natural gas NG, and then flows out from the outlet of the gasification tube bundle 5. The bottom of the chimney 7 is provided with a No. 1 demister 6. The outlet of the scrubber tower 13 is provided with a # 2 demister 14.
Combustible gas and air are mixed and combusted in the main burner, high-temperature smoke is generated and enters the smoke distributor 3, the smoke distributor 3 is a box-shaped or pipe-shaped element with small holes uniformly, the high-temperature smoke uniformly enters the water tank 4 through the small holes, and the high-temperature smoke in the water tank 4 is in direct contact with water to heat the water into hot water. After the flue gas goes out of the water tank 4, the flue gas passes through the No. 1 demister 6 and enters a chimney 7. The liquefied natural gas enters the gasification tube bundle 5 through an external pipeline, absorbs the heat of the hot water in the water tank 4 through partition wall heat exchange, is gasified to become natural gas, and then is sent out to a pipe network or a user. The auxiliary burner 8 is placed in the water tank 4 where a part of the combustible gas and air is burnt, producing high temperature flue gases, and the burner interior is not lined with refractory material, since the burner housing is cooled by the water in the water tank.
After the high-temperature flue gas exits the auxiliary burner 8, the high-temperature flue gas is mixed with the low-temperature flue gas from the chimney 7 in the gas mixer 9 to form medium-temperature flue gas. The gas mixer 9 may be a buffer tank, a static mixer or a flue, or other means or device for achieving uniform mixing of the gas flow. The denitration reducing agent is injected into the medium-temperature flue gas before the gas mixer 9 or the denitration reactor 10, and then enters the denitration reactor 10 together with the flue gas to react under the action of the catalyst to remove nitrogen oxides. The reducing agent system (which can be directly purchased from the market or self-made by the prior art) arranged in front of the gas mixer 9 or the denitration reactor 10 comprises a storage system, a conveying system and an injection system. The injection system adopts a spray gun direct injection technology, so that the reducing agent is more uniformly distributed in the flue and the denitration reactor 10. As a priority scheme, a rectification grid can be further arranged behind the reducing agent spray gun, numerical simulation is carried out on the denitration reactor 10 and the flue arrangement of the denitration system by adopting Computational Fluid Dynamics (CFD), the design of the denitration reactor 10 is optimized, and the positions and the number of the reducing agent injection points are confirmed, so that the purpose of accurately controlling the injection amount of the reducing agent is achieved, the escape of ammonia is effectively reduced, and the distribution of the flue gas and the reducing agent on the surface layer of the catalyst is more uniform.
The flue gas amount at the inlet of the denitration reactor 10 and the required reducing agent can be controlled by adopting a dual fuzzy control, predictive feedforward control and fitting optimization algorithm integrated control system, and the system pre-judges the equipment load and NO at the inlet of the reaction area in advanceXThe concentration variation trend is collected in real time to obtain the NO at the outletXAnd the ammonia escape concentration, finding out the optimal target values corresponding to different working conditions,the closed loop stability and the anti-interference capability of the denitration system are improved, the reducing agent input is always kept to be matched with the operation working condition of the equipment, and the double control target of NOX and ammonia escape is realized. The reducing agent is controlled by a metering pump, control parameters of the system are optimized, the ammonia nitrogen ratio is controlled to be slightly less than 1 all the time, the denitration reaction is ensured to be in a high-efficiency working range, and ammonia is prevented from escaping.
The medium temperature flue gas without nitrogen oxides enters a heat exchanger 11, the temperature of the medium temperature flue gas after nitrogen oxides removal and water from a water tank is reduced primarily, the medium temperature flue gas enters an induced draft fan 12, the medium temperature flue gas is pressurized by the induced draft fan 12 and then enters a gas washing tower 13, the medium temperature flue gas is directly contacted with sprayed water in the gas washing tower 13 for heat exchange, the temperature of the flue gas is further reduced to be below 30 ℃, and the flue gas is discharged after being subjected to mist removal by a No. 2 demister 14. The water in the heat exchanger 11 and the scrubber 13 comes from the water tank, and after heat exchange and scrubbing, the water absorbs the heat in the flue gas and returns to the water tank 4, and the heat in the water tank 4 is used for gasifying the LNG in the tube bundle. The heat in the flue gas is thoroughly recovered through two-stage heat exchange of the heat exchanger and the gas washing tower. The gas washing tower is used as the last stage of heat exchange, and can achieve the purposes of reducing the heat exchange area of the heat exchanger 11, deeply recovering waste heat and preventing ammonia from escaping.
Example two.
As shown in fig. 2.
The present embodiment is different from the first embodiment in that the auxiliary burner 8 is installed outside the water tank 4, and in this case, a water jacket 15 is provided outside the auxiliary burner 8, water from the water tank 4 is circulated in the water jacket 15, and the auxiliary burner 8 is kept cooled, thereby avoiding the installation of refractory material inside the burner 8. The rest is the same as the first embodiment.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (8)
1. An ultra-low NOx emission submerged combustion type gasification device is characterized by comprising a main fan (1), a main burner (2), a flue gas distributor (3), a water tank (4), a gasification tube bundle (5), a chimney (7), an auxiliary burner (8), a gas mixer (9), a denitration reactor (10), a heat exchanger (11), an induced draft fan (12) and a scrubber tower (13); the main fan (1) is connected with the main burner (2) and the auxiliary burner (8), and the main burner (2) is connected with the smoke distributor (3); the main burner (2), the gasification tube bundle (5) and the auxiliary burner (8) are arranged in the water tank (4); the smoke distributor (3) is arranged at the bottom of the water tank (4); the chimney (7) is connected with the top of the water tank (4); the outlets of the chimney (7) and the auxiliary burner (8) are connected with the gas mixer (9); the gas mixer (9), the denitration reactor (10), the heat exchanger (11), the induced draft fan (12) and the scrubber (13) are sequentially connected, and a reducing agent system is arranged in front of the gas mixer (9) or the denitration reactor (10).
2. The submerged combustion gasification unit with ultra-low NOx emission according to claim 1, characterized in that the water from the water tank (4) flows in two ways, one way to the heat exchanger (11) and the other way to the scrubber (13), and after heat exchange and scrubbing, the water returns to the water tank (4).
3. The ultra low NOx emission submerged combustion gasification unit according to claim 1, characterized in that the Liquefied Natural Gas (LNG) enters from the inlet of the gasification tube bundle (5), is gasified by heat absorption by the gasification tube bundle (5) to become Natural Gas (NG), and then flows out from the outlet of the gasification tube bundle (5).
4. The ultra low NOx emission submerged combustion gasifier according to claim 1, characterized in that the gasifier bundle (5) is a threaded pipe, an internally corrugated, externally threaded pipe, made of stainless steel or titanium alloy steel.
5. The ultra low NOx emission submerged combustion gasification unit according to claim 1, characterized in that the bottom of the chimney (7) is equipped with # 1 demister (6).
6. The ultra low NOx emission submerged combustion gasification unit according to claim 1, characterized in that the outlet of the scrubber tower (13) is equipped with # 2 demister (14).
7. The ultra low NOx emissions submerged combustion gasification apparatus according to claim 1, wherein the reductant system comprises a storage system, a delivery system, and an injection system.
8. The submerged combustion gasification apparatus with ultra-low NOx emission according to claim 1, characterized in that the auxiliary burner (8) is installed in the water tank (4) or installed outside the water tank (4), when installed outside the water tank (4), a water jacket (15) is installed outside the auxiliary burner (8), and the water inlet and outlet of the water jacket (15) are communicated with the water tank (4).
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| WO2022267205A1 (en) * | 2021-06-22 | 2022-12-29 | 江苏中圣高科技产业有限公司 | Submerged combustion gasification system making full use of waste heat and having ultra-low nox emissions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022267205A1 (en) * | 2021-06-22 | 2022-12-29 | 江苏中圣高科技产业有限公司 | Submerged combustion gasification system making full use of waste heat and having ultra-low nox emissions |
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