CN211232945U - Multi-fuel pure oxygen combustion system - Google Patents
Multi-fuel pure oxygen combustion system Download PDFInfo
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- CN211232945U CN211232945U CN201922283475.7U CN201922283475U CN211232945U CN 211232945 U CN211232945 U CN 211232945U CN 201922283475 U CN201922283475 U CN 201922283475U CN 211232945 U CN211232945 U CN 211232945U
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Abstract
The utility model relates to a multi-fuel pure oxygen combustion system belongs to industrial furnace burning field. The system is provided with an oxygen valve station and a plurality of fuel input valve stations, wherein a plurality of fuel input ports are arranged on a burner, part of the fuel input valve stations are correspondingly communicated with part of the fuel input ports on the burner in a one-to-one mode through own fuel conveying pipelines, and the rest of the fuel input valve stations are connected on a confluence pipeline in parallel through own fuel conveying pipelines and are correspondingly communicated with the rest of the fuel input ports on the burner through the confluence pipeline. The multi-fuel combustion system can rapidly switch the fuel types, can flexibly adjust the combustion mode according to the condition of the gas medium on site, not only saves the fuel cost, but also can ensure better heating effect.
Description
Technical Field
The utility model belongs to industrial furnace burning field, concretely relates to multi-fuel pure oxygen combustion system.
Background
When air is used for supporting combustion, 78% of nitrogen in the air does not participate in combustion reaction, and after the part of nitrogen enters a hearth, the part of nitrogen absorbs heat to reduce the temperature of the furnace, is used as a main component of flue gas, and can take away a large amount of heat to be discharged into the atmospheric environment, so that heat loss is caused. Especially in the production processes of periodic furnaces, ladle baking and the like with higher exhaust gas temperature, because a waste heat recovery device is not arranged, the larger the exhaust gas amount is, the higher the exhaust gas temperature is, the more the heat loss is, and the lower the effective heat utilization rate of the fuel is, taking a combustion system using natural gas as fuel air for heat supply as an example, when the exhaust gas temperature is 1000 ℃, about 45% of heat is taken away by the exhaust gas, and huge heat waste is caused.
When pure oxygen is adopted for combustion, the amount of flue gas can be reduced by more than 60% due to no nitrogen entering, the heat taken away by the flue gas can be reduced by 60% under the condition of the same exhaust temperature, and the energy-saving effect is very obvious. At present, pure oxygen combustion is mostly applied to high-calorific-value fuels such as natural gas and liquefied petroleum gas, and the fuels have high calorific value and high price, and the fuel cost is huge after long-term use.
In the steel enterprise, the byproducts of blast furnace and steel making, namely blast furnace gas and converter gas, are low in calorific value and combustion temperature and limited in application scene; the method is mainly applied to power generation or double-heat-accumulation combustion. The heat storage combustion is that the fuel and the combustion air are preheated to the high temperature close to the temperature of the hearth by the heat storage body and then enter the furnace for combustion, and because the fuel and the air are stored to the high temperature, a large amount of heat enters the hearth, and the high combustion temperature can be reached. The low calorific value fuel has low price and high yield, but for the furnace with large dust amount, along with the periodic suction of the heat accumulation combustion, dust impurities can be sucked into the heat accumulator to be accumulated in a smoke exhaust period, so that the heat accumulator can not be used. For example, steel ladles in a steel-making workshop are baked, when heat storage combustion is adopted, steel slag and dust in the steel ladles are easily sucked into the heat storage body to cause blockage, the sucked steel slag corrodes the heat storage body, the service life of the heat storage body is further shortened, the replacement period of the heat storage body is only 3-6 months, the production rhythm is influenced, and more expenses are needed for purchasing the heat storage body.
If high-calorific-value fuel is adopted for heat supply in periodic heating processes such as ladle baking, considerable fuel cost can be saved every year; or the pure oxygen combustion of blast furnace gas/converter gas is applied to ladle baking, so that the energy-saving effect is obvious, and the failure rate of the heat accumulator can be reduced. However, due to the balance problem of energy media in steel plants, the supply of blast furnace gas/converter gas may be insufficient, and only fuels such as externally introduced natural gas or liquefied petroleum gas are used at this time.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a multi-fuel pure oxygen combustion system, which can select the supply of high calorific value fuel or low calorific value fuel according to the requirement, so as to overcome the disadvantages of the conventional combustion system.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a multi-fuel pure oxygen combustion system comprises a burner, a combustion fan, a fuel input valve station, an automatic control system and an oxygen valve station; the burner is provided with N air input ports and N fuel input ports, M groups of fuel input valve stations are arranged in parallel, N is more than or equal to 2, and M is more than or equal to 2; each group of fuel input valve stations comprises a stop valve, a flow rate detector and an adjusting valve which are sequentially arranged on a fuel conveying pipeline along the fuel conveying direction;
when N is M, each group of fuel input valve stations are correspondingly communicated with each fuel input port on the burner one by one through a fuel conveying pipeline of each group of fuel input valve stations;
when N is less than M, part of the fuel input valve stations are correspondingly communicated with part of the fuel input ports on the burner in a one-to-one mode through the fuel conveying pipelines of the fuel input valve stations, and the rest of the fuel input valve stations are connected on the confluence pipeline in parallel through the fuel conveying pipelines of the fuel input valve stations and are correspondingly communicated with the rest of the fuel input ports on the burner through the confluence pipeline;
the combustion-supporting fan is correspondingly communicated with an air inlet of the burner through an air pipeline, and the oxygen valve station is communicated on the air pipeline through an oxygen conveying pipeline;
the automatic control system is correspondingly and electrically connected with the flow detection meters and the regulating valves in each group of fuel input valve stations.
Further, the shut-off valve is a manual valve or an automatic shut-off valve.
Further, when the stop valve is an automatic stop valve, the stop valve is correspondingly electrically connected with an automatic control system.
The beneficial effects of the utility model reside in that:
the multi-fuel combustion system can rapidly switch the fuel types, can flexibly adjust the combustion mode according to the condition of the gas medium on site, not only saves the fuel cost, but also can ensure better heating effect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the system.
Reference numerals:
the system comprises a burner nozzle-1, a combustion fan-2, a fuel input valve station-3, an automatic control system-4, an oxygen valve station-5, a confluence pipeline-6, an air pipeline-7 and an oxygen conveying pipeline-8; an air inlet-101, a fuel inlet-102; a fuel conveying pipeline-301, a stop valve-302, a flow rate detector-303 and a regulating valve-304.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1, a multi-fuel pure oxygen combustion system comprises a burner 1, a combustion fan 2, a fuel input valve station 3, an automatic control system 4, and an oxygen valve station 5; the burner 1 is provided with air input ports 101 and fuel input ports 102, wherein N fuel input ports are provided, M groups of fuel input valve stations are arranged in parallel, N is more than or equal to 2, and M is more than or equal to 2; each set of the fuel input valve stations 3 includes a shut valve 302, a flow rate detecting meter 303, and a regulating valve 304 that are provided in this order on a fuel delivery pipe 301 in the fuel delivery direction.
And when N is equal to M, each group of fuel input valve stations are correspondingly communicated with each fuel input port on the burner one by one through a fuel conveying pipeline of each group of fuel input valve stations. And when N is less than M, part of the fuel input valve stations are correspondingly communicated with part of the fuel input ports on the burner in a one-to-one mode through the fuel conveying pipelines of the fuel input valve stations, and the rest of the fuel input valve stations are connected on the confluence pipeline in parallel through the fuel conveying pipelines of the fuel input valve stations and correspondingly communicated with the rest of the fuel input ports on the burner 1 through the confluence pipeline 6.
The burner in the combustion system has a plurality of fuel inlets 102 and can use two or more fuels.
The combustion-supporting fan 2 is correspondingly communicated with an air inlet 101 of the burner 1 through an air pipeline 7, and the oxygen valve station 5 is communicated with the air pipeline 7 through an oxygen conveying pipeline 8. The combustion-supporting fan 2 and the oxygen valve station 5 can correspondingly realize air combustion supporting and oxygen combustion supporting, and when the air is used for combustion supporting instead of oxygen, the combustion-supporting fan is started, and air enters the burner; if oxygen is used for combustion supporting, the combustion supporting fan 2 can be turned off, and of course, the oxygen and the combustion supporting fan can be mixed.
The automatic control system 4 is electrically connected to the flow rate detecting meters 303 and the regulating valves 304 in the respective sets of fuel inlet valve stations 3. The opening and closing conditions of each regulating valve 304 can be correspondingly controlled through an automatic control system. Specifically, the fuel flow rate detector 303 is connected to the automatic control system by a signal, and adjusts the opening of the (fuel) regulating valve 304 according to the detected fuel flow rate value, so that the detected fuel flow rate value meets the target requirement. The automatic control system increases the opening degree of the (fuel) regulating valve 304 if the flow rate detection value is smaller than the target demand value, and decreases the opening degree of the (fuel) regulating valve 304 if the flow rate detection value is larger than the target demand value. When the cut-off valve is an automatic cut-off valve, the automatic control system 4 can also remotely switch the automatic cut-off valve.
The shut-off valve 302 in the fuel inlet valve station 3 may be a manual valve or an automatic shut-off valve. The combination form of the automatic cut-off valve and the manual cut-off valve can be selected according to the situation. The combination of the manual valve and the automatic cut-off valve is selected, and after the manual valve is opened on site by an operator, the automatic cut-off valve is remotely opened and closed, so that the remote operation is more favorable for personnel safety. Meanwhile, each fuel is cut off by adopting an automatic valve, so that the labor intensity can be reduced. The trip valve in this scheme is automatic trip valve, and it corresponds and is connected with automatic control system 4 electricity to realize automatic control system 4's remote switch control.
When the automatic regulating valve is used, a measurement signal of the flow rate detector 303 is inputted to an automatic control system, and the control system automatically sets the opening degree of the regulating valve based on the oxygen flow rate and the fuel flow rate so that the flow rate reaches a target value. The mode of automatic regulating valve can improve the automation level of the combustion system and also can provide better control precision.
Example one
The combustion system can be used for heating ladle baking, two fuels of natural gas and blast furnace gas are adopted according to actual conditions, and the burner can be burnt by using the two fuels. Wherein the natural gas has high heat value and high price, and the blast furnace gas has low heat value and low price. The combustion system comprises an oxygen valve station, a natural gas valve station (a natural gas manual cut-off valve, a natural gas automatic cut-off valve, a natural gas flow detector and a natural gas automatic regulating valve), a blast furnace gas valve station (a blast furnace gas manual cut-off valve, a blast furnace gas automatic cut-off valve, a blast furnace gas flow detector and a blast furnace gas automatic regulating valve) and a burner.
The natural gas and the blast furnace gas are connected from the upstream, respectively enter a natural gas valve station and a blast furnace gas valve station, and then are connected to the burner. Oxygen is introduced into the burner after passing through the oxygen valve station. Blast furnace gas has low combustion temperature due to low heat value if air is used for combustion supporting, and can not bake the ladle to the high temperature of more than 1000 ℃, while pure oxygen is used for combustion supporting, and the combustion temperature is greatly increased due to the great reduction of the smoke gas amount, so that the ladle can be baked to the high temperature of more than 1000 ℃. And blast furnace gas is cheap compared to natural gas: the fuel price of the blast furnace gas is only 1/4 of natural gas when the same heat is supplied, so that the blast furnace gas is used as the fuel for baking the ladle, and a great deal of fuel cost can be saved. From the viewpoint of fuel cost, blast furnace gas is used as a main fuel for heat supply. At the moment, the natural gas valve station is in a closed state, the manual cut-off valve, the automatic cut-off valve and the automatic regulating valve in the natural gas valve station are in a closed state, and the pipeline between the natural gas and the burner is cut off. The blast furnace gas valve station is in an open state, the manual cut-off valve and the automatic cut-off valve in the valve station are in open states, the automatic control system measures the flow of the blast furnace gas through the flow detector, and the opening degree is adjusted through the automatic adjusting valve, so that the blast furnace gas and the oxygen keep proper proportion, the complete combustion of the blast furnace gas is ensured, the heat is rapidly supplied, and the steel ladle is baked.
When a blast furnace fails or is overhauled, the supply of blast furnace gas is interrupted for a short time, generally from several hours to several days, and in order to ensure the normal production of steelmaking continuous casting, the ladle baking must be maintained. At this time, the fuel is switched and natural gas is used for combustion heating. And closing the blast furnace gas valve station, the blast furnace gas manual cut-off valve, the blast furnace gas automatic cut-off valve and the blast furnace gas automatic regulating valve, and cutting off the pipeline between the blast furnace gas and the burner. And opening the natural gas valve station, manually cutting off the natural gas valve, and opening the automatic natural gas cutting off valve, wherein the automatic control system measures the gas flow through the natural gas flow detector, and adjusts the opening degree through the automatic adjusting valve, so that the natural gas and the oxygen can be quickly combusted and baked in a proper proportion to the steel ladle. So as to ensure the continuous steel-making production. And when the supply of the blast furnace gas is recovered, switching the valve station, closing the natural gas valve station, opening the blast furnace gas valve station, and supplying heat by the blast furnace gas.
When the blast furnace gas demand in other links is large, the energy medium is unbalanced, and the flow rate of the blast furnace gas supplied to the ladle baking process link is low, partial natural gas needs to be supplied due to insufficient flow rate of the blast furnace gas, and the two fuels are supplied to the burner for combustion at the same time. At the moment, the valve stations of the two fuels are in an open state, and simultaneously, the flow of the blast furnace gas and the flow of the natural gas are adjusted through an automatic control system, a flow detection meter and an adjusting valve, so that the flow of the blast furnace gas and the flow of the natural gas are matched with the flow of the oxygen, and the complete combustion is ensured.
The multi-fuel combustion system can rapidly switch the fuel types, uses blast furnace gas with low price for heat supply in most of the running time of the system, and rapidly switches to natural gas for heat supply when the gas supply is interrupted due to blast furnace maintenance or faults, thereby ensuring the smooth operation of steel-making production. When the blast furnace gas is short of supply, two fuels can be used simultaneously, and a part of natural gas is supplied for heat supplement. When the supply of the blast furnace gas is recovered, the blast furnace gas is switched back to supply heat. Because the blast furnace gas is low in price, the system can save a large amount of fuel cost and can ensure normal ladle baking in an abnormal working state.
Example two
A multi-fuel pure oxygen combustion system is used for heat supply of a holding furnace in a steel rolling workshop, and three fuels, namely natural gas, mixed gas and blast furnace gas, are adopted according to actual conditions. The mixed gas and the blast furnace gas are produced by self in the steel plant, the natural gas is expensive for outsourcing, and the blast furnace gas or the mixed gas is used for heat supply as much as possible in consideration of the cost. The combustion system comprises an oxygen valve station, a natural gas valve station, a mixed gas valve station and a blast furnace gas valve station, each fuel input valve station comprises a cut-off valve, an adjusting valve and a flow detector, and other components comprise a combustion-supporting fan, a combustion-supporting air pipeline and a burner.
The blast furnace gas, the mixed gas and the natural gas are introduced from an upstream pipeline, respectively enter the corresponding fuel input valve stations, and then are introduced into the burner, and the burner can use three fuels for combustion.
When the supply of blast furnace gas is sufficient, a mode of combustion supporting of the blast furnace gas and pure oxygen is used for heating, the oxygen valve station and the blast furnace gas valve station are in an open state, the mixed gas valve station and the natural gas valve station are in a closed state, and the combustion-supporting fan is in a closed state. The oxygen is used for combustion supporting, and the combustion temperature is high, so that the blast furnace gas with very low heat value can be used for heating the furnace to the high temperature of more than 1000 ℃. Meanwhile, the blast furnace gas has low price, and the cost of the oxygen is lower than that of the natural gas.
When the mixed gas is sufficiently supplied, the heat value of the mixed gas is generally more than 1800kCal/Nm3 due to the high heat value of the mixed gas, and the furnace can be heated to the high temperature of more than 1000 ℃ by using the mixed gas and air combustion supporting mode. At the moment, the combustion-supporting fan is started, combustion-supporting air enters the burner through the pipeline, the mixed gas valve station is in an open state, the mixed gas enters the burner after passing through the valve station and is mixed with the combustion-supporting air to burn for supplying heat, and the blast furnace gas valve station, the natural gas valve station and the oxygen valve station are all closed.
When the supply of the mixed gas and the blast furnace gas is insufficient, the mixed gas and the blast furnace gas are combusted in a combustion supporting mode of natural gas and pure oxygen to heat. For a periodic furnace, because the furnace temperature frequently rises and falls, the flue gas temperature fluctuation is large, and the furnace is also frequently started and stopped, the arrangement of a waste heat recovery device in a flue is not economical. Because the flue gas needs to carry away the heat in the furnace, the heat loss needs to be reduced, and the flue gas volume can be reduced as much as possible. The mode of heating by using natural gas and pure oxygen can reduce the smoke gas amount by more than 70%, the heat taken away by the smoke gas amount is reduced by 70%, and the heat loss can be greatly reduced by using pure oxygen for combustion supporting. The oxygen valve station and the natural gas valve station are in an open state, and the blast furnace gas valve station, the mixed gas valve station and the combustion fan are in a closed state.
The multi-fuel pure oxygen combustion system flexibly adjusts the combustion mode according to the condition of the gas medium on site, thereby not only saving the fuel cost, but also ensuring better heating effect.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (3)
1. The utility model provides a many fuel pure oxygen combustion system, includes nozzle, combustion fan, fuel input valve station and automatic control system, its characterized in that: an oxygen valve station is also included; the burner is provided with N air input ports and N fuel input ports, M groups of fuel input valve stations are arranged in parallel, N is more than or equal to 2, and M is more than or equal to 2; each group of fuel input valve stations comprises a stop valve, a flow rate detector and an adjusting valve which are sequentially arranged on a fuel conveying pipeline along the fuel conveying direction;
when N is M, each group of fuel input valve stations are correspondingly communicated with each fuel input port on the burner one by one through a fuel conveying pipeline of each group of fuel input valve stations;
when N is less than M, part of the fuel input valve stations are correspondingly communicated with part of the fuel input ports on the burner in a one-to-one mode through the fuel conveying pipelines of the fuel input valve stations, and the rest of the fuel input valve stations are connected on the confluence pipeline in parallel through the fuel conveying pipelines of the fuel input valve stations and are correspondingly communicated with the rest of the fuel input ports on the burner through the confluence pipeline;
the combustion-supporting fan is correspondingly communicated with an air inlet of the burner through an air pipeline, and the oxygen valve station is communicated on the air pipeline through an oxygen conveying pipeline;
the automatic control system is correspondingly and electrically connected with the flow detection meters and the regulating valves in each group of fuel input valve stations.
2. The multi-fuel oxy-combustion system of claim 1, wherein: the cut-off valve is a manual valve or an automatic cut-off valve.
3. The multi-fuel oxy-combustion system of claim 2, wherein: when the cut-off valve is an automatic cut-off valve, the cut-off valve is correspondingly electrically connected with an automatic control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922283475.7U CN211232945U (en) | 2019-12-18 | 2019-12-18 | Multi-fuel pure oxygen combustion system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922283475.7U CN211232945U (en) | 2019-12-18 | 2019-12-18 | Multi-fuel pure oxygen combustion system |
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| CN211232945U true CN211232945U (en) | 2020-08-11 |
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