CN109439342B - Liquefied natural gas oven system and process method - Google Patents
Liquefied natural gas oven system and process method Download PDFInfo
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- CN109439342B CN109439342B CN201811432549.2A CN201811432549A CN109439342B CN 109439342 B CN109439342 B CN 109439342B CN 201811432549 A CN201811432549 A CN 201811432549A CN 109439342 B CN109439342 B CN 109439342B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B17/00—Preheating of coke ovens
Abstract
The invention provides a liquefied natural gas furnace baking system and a process method, wherein the system comprises a pyrolysis coal gas heating furnace (1), an electronic igniter (2), an auxiliary fire source (3), a furnace baking device (4), a combustion fan (5), a combustion fan variable frequency regulator (6), a hydraulic natural gas tank car (21), a finned tube steam atomizer (23), a natural gas pressure stabilizing tank (27), a smoke exhaust fan (37), a smoke exhaust fan variable frequency regulator (38) and a temperature, pressure and flow detection system. Aims to 1) solve the problems of full atomization, stable gas supply, balance of gas supply and forced smoke discharge and stable combustion of low-temperature liquefied natural gas in a forced smoke discharge system. 2) Solves the technical problems of overlong flame, overhigh combustion temperature, difficult control of the furnace baking process and the like of the traditional furnace baking device.
Description
Technical Field
The invention relates to the technical field of liquefied natural gas drying furnaces, in particular to a liquefied natural gas drying furnace system and a process method.
Background
In the low-price coal pyrolysis comprehensive utilization project, a coal pyrolysis gas (high-heating value coal gas generated by a coal pyrolysis furnace) heating furnace and the coal pyrolysis furnace are key facilities of the whole process, and before the coal pyrolysis gas heating furnace and the coal pyrolysis furnace are put into operation, a furnace body refractory material lining and a pipeline refractory material lining need to be dried, moisture is removed, and the lining masonry is put into normal production after the lining masonry reaches the working temperature (about 1000 ℃). Before the coal pyrolysis gas heating furnace and the coal pyrolysis furnace are put into operation, no fuel gas can be supplied to the furnace in a factory, only the liquefied natural gas of a tank car can be used as a furnace baking fuel, the liquefied natural gas is low-temperature high-calorific-value gas, and how to ensure that the furnace baking is finished in a forced smoke exhaust system is very important. The oven technology is invented for the specific situation.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a liquefied natural gas furnace drying system and a process method, and aims to 1) solve the problems of full atomization, stable gas supply, balance of gas supply and forced smoke discharge and stable combustion of low-temperature liquefied natural gas in a forced smoke discharge system. 2) Solves the technical problems of overlong flame, overhigh combustion temperature, difficult control of the furnace baking process and the like of the traditional furnace baking device.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a liquefied natural gas baker system, includes pyrolysis of coal gas heating furnace (1), electronic igniter (2), supplementary fire source (3), baker device (4), combustion fan (5), combustion fan frequency conversion regulator (6), hydraulic pressure natural gas tank car (21), finned tube steam atomizer (23), natural gas surge tank (27), smoke exhaust fan (37), smoke exhaust fan frequency conversion regulator (38), and temperature, pressure, flow detecting system.
The drying furnace device (4) is of a horizontally-mounted three-layer sleeve structure and sequentially comprises an air central pipe (46), a liquefied natural gas pipe (44) and an air main pipe (54) from inside to outside; one end of the three-layer sleeve structure is a flange (57), the other end of the three-layer sleeve structure is a flame nozzle, the nozzle end face (48) of the air central pipe (46) and the nozzle end face (50) of the liquefied natural gas pipe (44) are both positioned inside the end face of the air main pipe (54), and the distance between the nozzle end face (50) of the liquefied natural gas pipe 4 and the end face of the air main pipe (54) is larger than the distance between the nozzle end face (48) of the air central pipe (46) and the end face of the air main pipe (54).
Spoilers (45) and (52) are further arranged in the air main pipe (54) and the liquefied natural gas pipe (44), the spoilers (45) and (52) form an angle of 30-60 degrees with the air main pipe (54) or the liquefied natural gas pipe (44), the outer side of the nozzle end face (50) of the liquefied natural gas pipe 4 and the spoilers at the tail end of the air main pipe (54) form a closed surface, and a plurality of through holes are formed in the spoilers on the closed surface and are nozzles (47) of the air main pipe.
A process method of a liquefied natural gas furnace drying system comprises the following steps:
1) liquefied natural gas is provided by a liquefied natural gas tank truck (21), the liquefied natural gas is firstly sent to a finned tube steam atomizer (23) through a metal hose (22) to be heated and gasified, a heating medium is high-temperature steam and passes through the finned tube, the liquefied natural gas passes through the outside of the finned tube, and the liquefied natural gas is heated by the finned tube steam atomizer to become gas natural gas;
2) the natural gas is sent to a natural gas pressure stabilizing tank (27) through a pipeline, the pressure stabilizing tank and an outlet pipeline thereof are provided with an electric heating device (28), the residual liquefied natural gas is heated to be further heated, the output natural gas is ensured to be completely gasified, and the pressure and the flow rate are stable;
3) combustion air is provided by a combustion-supporting fan (5), the pressure flow of the combustion-supporting fan is regulated by a fan frequency conversion regulator (6), an outlet pipeline of the combustion-supporting fan is divided into two parts, and the combustion-supporting air is respectively sent to a main air pipeline and an auxiliary air pipeline of a furnace drying device (4) of the heating furnace (1);
4) the heating furnace is not provided with a chimney, and the smoke generated by the baking furnace is sent to the purification device by the smoke exhaust fan (37) and then is discharged by the chimney in a centralized way. The flow and the pressure of the smoke exhaust fan (37) are adjusted by a frequency converter (38), and the flow and the pressure of the smoke exhaust fan are controlled according to the flow and the pressure of the combustion-supporting fan, the flow and the pressure signals of the liquefied natural gas, so that the furnace drying process is ensured to be carried out stably.
As an auxiliary, the flow and pressure matching of the combustion fan (5) and the flue gas fan (37) is realized by controlling the outlet pipeline regulating valves (11) and (17) of the combustion fan (5), the bleeding valve (10) and the flue gas pipeline regulating valve (35).
Compared with the prior art, the invention has the beneficial effects that:
1. the pressure stabilizing tank and an outlet pipeline thereof are provided with an electric heating device, the residual liquefied natural gas is heated to be further heated, the output natural gas is ensured to be completely gasified, and the pressure stabilizing tank and the outlet pipeline thereof have stable pressure and flow; the pressure and flow of the combustion fan are adjusted by a fan frequency conversion regulator, the heating furnace is not provided with a chimney, and the smoke generated by the baking furnace is sent to a purification device by a smoke exhaust fan and then is discharged by the chimney in a centralized way. The flow and the pressure of the smoke exhaust fan are regulated by a frequency converter, and are controlled according to the flow and the pressure of the combustion fan, the flow and the pressure signal of the liquefied natural gas, so as to ensure the stable operation of the furnace baking process;
2. the external horizontal channel is an air main channel, the central horizontal channel is an air auxiliary channel, the middle horizontal channel is a liquefied natural gas channel, the structure is simple and light, and the external air pipeline and the natural gas pipeline are connected by flanges, so that the external air pipeline and the natural gas pipeline are conveniently horizontally mounted and dismounted;
3. the front end of the oven device is provided with air and liquefied natural gas nozzles which form a certain angle with the horizontal line, so that the air and liquefied natural gas can be fully mixed and completely combusted near the front end of the nozzles, horizontal flame and short-time combustion can be realized, and the kiln brick lining can be prevented from being burnt and damaged due to overlength flame and overhigh temperature;
4. the air outer ring is provided with an air spoiler, the liquefied natural gas ring is provided with a liquefied natural gas spoiler, and the liquefied natural gas and the air are in a rotational flow state at the nozzle, so that the air liquefied natural gas can be conveniently mixed and combusted in a short distance at the outlet;
5. the liquefied natural gas is high-heating value gas, the temperature of the oven is controlled by adopting an outer ring excess air method during oven drying, and the excess air also plays a role in cooling and protecting the shell of the oven drying device when passing through the oven, so that the oven drying device does not need to be replaced in the whole oven drying process;
drawings
FIG. 1 is a schematic view of the process structure of the present invention;
fig. 2 is a structural view of the oven device of the present invention.
Wherein: 1-a heating furnace 2-an electronic igniter 3-an auxiliary fire source 4-a baking furnace device 5-an air supply system comprises a combustion fan 6-a combustion fan frequency conversion regulator 7-a combustion air outlet pipeline 8-an outlet pipeline cut-off valve 9-a combustion air diffusing pipeline 10-a combustion air diffusing valve 11-a combustion air main pipe regulating valve 12-a main pipe flow meter 13-a main pipe thermometer 14-a combustion air main pipe 15-a main pipe pressure gauge 16-a combustion air branch pipe 17-a combustion air branch pipe regulating valve 18-a combustion air branch pipe flow meter 19-a combustion air branch pipe thermometer 20-a branch pipe pressure gauge 21-a liquefied natural gas system comprises a liquefied natural gas tank truck 22-a tank truck outlet metal hose 23-a liquefied natural gas atomizer 24-an atomizer outlet 25 of pipeline, 26 of outlet pipeline regulating valve, 27 of outlet pipeline cut-off valve, 28 of natural gas surge tank, 29 of surge tank heating device, 30 of surge tank outlet pipeline, 31 of surge tank outlet pipeline flowmeter, 32 of thermometer, 33 of pressure gauge, 34 of heating furnace flue gas outlet pipeline, 35 of flue gas outlet pipeline cut-off valve, 36 of flue gas regulating valve, 37 of flow meter, 38 of smoke exhaust fan, 39 of smoke exhaust fan frequency conversion regulator, 40 of smoke exhaust fan outlet pipeline, 41 of thermometer, 42 of pressure gauge, 43 of air main pipe, 44 of baking furnace device connecting flange, 45 of liquefied natural gas annular channel, 46 of air annular main channel spoiler, 47 of air central channel, 48 of air annular main channel spout, 49 of air central channel spout, 46 of electronic ignition device The method comprises the steps of arranging 50 liquefied natural gas nozzles 51, air main pipe anchoring nails 52, an liquefied natural gas annular channel spoiler 53, air main pipe fire-resistant heat-insulating materials 54, an air main ring channel 55, an air central pipeline 56, an liquefied natural gas pipeline 57 and an air pipeline connecting flange.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the present invention is composed of a heating furnace system, an air supply system, a liquefied natural gas system and a smoke exhaust system.
The heating furnace system comprises a coal pyrolysis gas heating furnace (1), an electronic igniter (2), an auxiliary fire source (3) and a furnace baking device (4).
The air supply system comprises a combustion-supporting fan (5), a combustion-supporting fan frequency conversion regulator (6), a combustion-supporting air outlet pipeline (7), an outlet pipeline cut-off valve (8), a combustion-supporting air release pipeline (9), a combustion-supporting air release valve (10), a combustion-supporting air main pipe regulating valve (11), a main pipe flowmeter (12), a main pipe thermometer (13), a combustion-supporting air main pipe (14), a main pipe pressure gauge (15), a combustion-supporting air branch pipe (16), a combustion-supporting air branch pipe regulating valve (17), a combustion-supporting air branch pipe flowmeter (18), a combustion-supporting air branch pipe thermometer (19) and a branch pipe.
The liquefied natural gas system comprises a liquefied natural gas tank truck (21), a tank truck outlet metal hose (22), a liquefied natural gas atomizer (23), an atomizer outlet pipeline (24), an outlet pipeline regulating valve (25), an outlet pipeline stop valve (26), a natural gas pressure stabilizing tank (27), a pressure stabilizing tank heating device (28), a pressure stabilizing tank outlet pipeline (29), a pressure stabilizing tank outlet pipeline flowmeter (30), a thermometer (31) and a pressure gauge (32).
The flue gas system comprises a heating furnace flue gas outlet pipeline (33), a flue gas outlet pipeline stop valve (34), a flue gas regulating valve (35), a flowmeter (36), a smoke exhaust fan (37), a smoke exhaust fan frequency conversion regulator (38), a smoke exhaust fan outlet pipeline (39), a thermometer (40) and a pressure gauge (41).
As shown in fig. 2, the oven device (4) is a horizontally installed three-layer sleeve structure, and comprises an air central pipe (46), a liquefied natural gas pipe (44) and an air main pipe (54) from inside to outside in sequence; one end of the three-layer sleeve structure is a flange (57), the other end of the three-layer sleeve structure is a flame nozzle, the nozzle end face (48) of the air central pipe (46) and the nozzle end face (50) of the liquefied natural gas pipe (44) are both positioned inside the end face of the air main pipe (54), and the distance between the nozzle end face (50) of the liquefied natural gas pipe 4 and the end face of the air main pipe (54) is larger than the distance between the nozzle end face (48) of the air central pipe (46) and the end face of the air main pipe (54).
Spoilers (45) and (52) are further arranged in the air main pipe (54) and the liquefied natural gas pipe (44), the spoilers (45) and (52) form an angle of 30-60 degrees with the air main pipe (54) or the liquefied natural gas pipe (44), the outer side of the nozzle end face (50) of the liquefied natural gas pipe 4 and the spoilers at the tail end of the air main pipe (54) form a closed surface, and a plurality of through holes are formed in the spoilers on the closed surface and are nozzles (47) of the air main pipe.
A process method of a liquefied natural gas furnace drying system comprises the following steps:
1) liquefied natural gas is provided by a liquefied natural gas tank truck (21), the liquefied natural gas is firstly sent to a finned tube steam atomizer (23) through a metal hose (22) to be heated and gasified, a heating medium is high-temperature steam and passes through the finned tube, the liquefied natural gas passes through the outside of the finned tube, and the liquefied natural gas is heated by the finned tube steam atomizer to become gas natural gas;
2) the natural gas is sent to a natural gas pressure stabilizing tank (27) through a pipeline, the pressure stabilizing tank and an outlet pipeline thereof are provided with an electric heating device (28), the residual liquefied natural gas is heated to be further heated, the output natural gas is ensured to be completely gasified, and the pressure and the flow rate are stable;
3) combustion air is provided by a combustion-supporting fan (5), the pressure flow of the combustion-supporting fan is regulated by a fan frequency conversion regulator (6), an outlet pipeline of the combustion-supporting fan is divided into two parts, and the combustion-supporting air is respectively sent to a main air pipeline and an auxiliary air pipeline of a furnace drying device (4) of the heating furnace (1);
4) the heating furnace is not provided with a chimney, and the smoke generated by the baking furnace is sent to the purification device by the smoke exhaust fan (37) and then is discharged by the chimney in a centralized way. The flow and the pressure of the smoke exhaust fan (37) are adjusted by a frequency converter (38), and the flow and the pressure of the smoke exhaust fan are controlled according to the flow and the pressure of the combustion-supporting fan, the flow and the pressure signals of the liquefied natural gas, so that the furnace drying process is ensured to be carried out stably.
As an auxiliary, the flow and pressure matching of the combustion fan (5) and the flue gas fan (37) is realized by controlling the outlet pipeline regulating valves (11) and (17) of the combustion fan (5), the bleeding valve (10) and the flue gas pipeline regulating valve (35).
According to the oven device, the outer ring horizontal channel is an air main channel (54), the central horizontal channel is an air auxiliary channel (46), the middle horizontal ring channel is an liquefied natural gas channel (44), air and liquefied natural gas both horizontally flow, and the flow direction of the air and the liquefied natural gas changes after passing through the spoiler to form a rotational flow state, so that the full mixing of the air and the liquefied natural gas at an outlet is facilitated, and the short combustion is realized.
The liquefied natural gas nozzles (50), the air nozzles (48) and (47) are positioned at the front end of the furnace baking device, the central area and the outer ring area are air nozzles, the middle ring area is a liquefied natural gas nozzle (50), the nozzles are of a contraction expansion type and form a certain angle with the horizontal line, so that the air and the liquefied natural gas can be rapidly and fully mixed after flowing out of the nozzles, short combustion is formed, and the lining of the furnace kiln is prevented from being burnt and damaged due to overlong flame.
The liquefied natural gas is high-heating value gas, the furnace temperature is controlled by adopting an outer ring excess air method during furnace baking, and the excess air plays a role in cooling and protecting the shell of the furnace baking device when passing through the furnace baking device, so that the service life of the furnace baking device is prolonged.
And after the oven is finished, the whole oven device is dismantled, and the mounting hole is sealed by a blind plate.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (3)
1. The liquefied natural gas drying system is characterized by comprising a pyrolysis coal gas heating furnace (1), an electronic igniter (2), an auxiliary fire source (3), a drying device (4), a combustion fan (5), a combustion fan frequency conversion regulator (6), a hydraulic natural gas tank truck (21), a finned tube steam atomizer (23), a natural gas pressure stabilizing tank (27), a smoke exhaust fan (37), a smoke exhaust fan frequency conversion regulator (38) and a temperature, pressure and flow detection system;
the drying furnace device (4) is of a horizontally-mounted three-layer sleeve structure and sequentially comprises an air central pipe (46), a liquefied natural gas pipe (44) and an air main pipe (54) from inside to outside; one end of the three-layer sleeve structure is a flange (57), the other end of the three-layer sleeve structure is a flame nozzle, the nozzle end surface (48) of the air central pipe (46) and the nozzle end surface (50) of the liquefied natural gas pipe (44) are both positioned inside the end surface of the air main pipe (54), and the distance between the nozzle end surface (50) of the liquefied natural gas pipe 4 and the end surface of the air main pipe (54) is greater than the distance between the nozzle end surface (48) of the air central pipe (46) and the end surface of the air main pipe (54);
spoilers (45) and (52) are further arranged in the air main pipe (54) and the liquefied natural gas pipe (44), the spoilers (45) and (52) form an angle of 30-60 degrees with the air main pipe (54) or the liquefied natural gas pipe (44), the outer side of the nozzle end face (50) of the liquefied natural gas pipe 4 and the spoilers at the tail end of the air main pipe (54) form a closed surface, and a plurality of through holes are formed in the spoilers on the closed surface and are nozzles (47) of the air main pipe.
2. The process of a lng furnace system according to claim 1, comprising:
1) liquefied natural gas is provided by a liquefied natural gas tank truck (21), the liquefied natural gas is firstly sent to a finned tube steam atomizer (23) through a metal hose (22) to be heated and gasified, a heating medium is high-temperature steam and passes through the finned tube, the liquefied natural gas passes through the outside of the finned tube, and the liquefied natural gas is heated by the finned tube steam atomizer to become gas natural gas;
2) the natural gas is sent to a natural gas pressure stabilizing tank (27) through a pipeline, the pressure stabilizing tank and an outlet pipeline thereof are provided with an electric heating device (28), the residual liquefied natural gas is heated to be further heated, the output natural gas is ensured to be completely gasified, and the pressure and the flow rate are stable;
3) combustion air is provided by a combustion-supporting fan (5), the pressure flow of the combustion-supporting fan is regulated by a fan frequency conversion regulator (6), an outlet pipeline of the combustion-supporting fan is divided into two parts, and the combustion-supporting air is respectively sent to a main air pipeline and an auxiliary air pipeline of a furnace drying device (4) of the heating furnace (1);
4) the heating furnace is not provided with a chimney, smoke generated by the furnace baking is sent to the purifying device by the smoke exhaust fan (37) and then is intensively discharged by the chimney, the flow and the pressure of the smoke exhaust fan (37) are adjusted by the frequency converter (38), and the control is carried out according to the flow and the pressure of the combustion-supporting fan, the flow and the pressure of liquefied natural gas and pressure signals, so as to ensure the stable operation of the furnace baking process.
3. A process of an lng baking system according to claim 2, characterized in that the flow and pressure matching of the combustion fan (5) and the flue gas fan (37) is achieved as an aid by controlling the combustion fan (5) outlet duct regulating valves (11), (17), the blow-off valve (10), and the flue gas duct regulating valve (35).
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| CN109439342A (en) | 2019-03-08 |
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