CN114278962A - Heating furnace ignition safety protection method - Google Patents
Heating furnace ignition safety protection method Download PDFInfo
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- CN114278962A CN114278962A CN202111591315.4A CN202111591315A CN114278962A CN 114278962 A CN114278962 A CN 114278962A CN 202111591315 A CN202111591315 A CN 202111591315A CN 114278962 A CN114278962 A CN 114278962A
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Abstract
The invention provides a safety protection method for heating furnace ignition, which relates to the technical field of heating furnace ignition and comprises the following steps: analyzing the atmosphere in the heating furnace, and if the concentration of the fuel gas in the heating furnace exceeds a first preset threshold value, interrupting ignition; respectively monitoring the flow of the gas supply main pipe and the flow of the diffusion pipe, and if the flow of the gas supply main pipe is larger than the flow of the diffusion pipe, interrupting ignition; and detecting the hearth pressure of the heating furnace, and if the hearth pressure exceeds a third preset threshold value, interrupting ignition. The invention can effectively reduce the safety risk after the gas concentration is over the safety limit value in the ignition process of the heating furnace, reduce the safety risk caused by gas leakage when nitrogen or other inert gases are replaced by gas, and reduce the safety risk of gas leakage caused by overhigh pressure in the hearth.
Description
Technical Field
The invention relates to the technical field of heating furnace ignition, in particular to a safety protection method for heating furnace ignition.
Background
Safety is confirmed before the current heating furnace ignites, and at present, the manual check of the hand valve is mainly carried out by operators. A general bar heating furnace is provided with more than 60 hand valves, a wire heating furnace is also provided with more than 40 hand valves, omission and negligence easily occur in the manual inspection process, and after the heating furnace starts to ignite, an operator cannot enter the heating furnace again, and the leakage of the field hand valves cannot be detected in the ignition process. Therefore, if the gas pipeline, the hand valve and the like in the heating furnace leak after the heating furnace starts to ignite, the detection is difficult, and a great potential safety hazard exists.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a safety protection method for ignition of a heating furnace, which is used to solve the problem in the prior art that it is difficult to monitor the ignition of the heating furnace.
In order to achieve the above objects and other related objects, the present invention provides a safety protection method for ignition of a heating furnace, comprising the following steps:
analyzing the atmosphere in the heating furnace, and if the concentration of the fuel gas in the heating furnace exceeds a first preset threshold value, interrupting ignition; monitoring the flow of the gas supply main pipe and the flow of the diffusion pipe respectively, and if the duration that the flow of the gas supply main pipe is larger than the flow of the diffusion pipe is larger than a second preset threshold value, interrupting ignition; and detecting the hearth pressure of the heating furnace, and if the hearth pressure exceeds a third preset threshold value, interrupting ignition.
Optionally, the method further comprises the following steps: and supplying combustion-supporting gas into the heating furnace before ignition, and interrupting ignition if the pressure of the combustion-supporting gas is lower than a fourth preset threshold value.
Optionally, the method further comprises the following steps: and monitoring the flow of all the gas supply branch pipes, and if the flow of the gas supply main pipe exceeds the sum of the flow of all the gas supply branch pipes, interrupting ignition.
Optionally, the method further comprises the following steps: and if the concentration of the fuel gas in the heating furnace exceeds a sixth preset threshold value, sending an alarm signal, wherein the sixth preset threshold value is smaller than the first preset threshold value.
Optionally, the method further comprises the following steps: and if the hearth pressure of the heating furnace exceeds a seventh preset threshold value, sending an alarm signal, wherein the seventh preset threshold value is smaller than the third preset threshold value.
Optionally, the fuel gas is carbon monoxide and the first preset threshold is 50 ppm.
Optionally, the fuel gas is carbon monoxide, and the sixth preset threshold is 24 ppm.
Optionally, the third preset threshold is 0pa,
optionally, the seventh preset threshold is-5 pa.
Optionally, the fourth preset threshold is 7 kpa.
As mentioned above, the ignition safety protection method for the heating furnace provided by the invention has the following beneficial effects: because the concentration of the fuel gas in the heating furnace is monitored, the ignition is interrupted when the concentration of the fuel gas exceeds a preset threshold value, the safety risk after the concentration of the fuel gas exceeds the safety limit value in the ignition process of the heating furnace can be effectively reduced, if the duration that the flow of the fuel gas supply main pipe is larger than the flow of the diffusing pipe is larger than a second preset threshold value, the ignition is interrupted, and the safety risk caused by fuel gas leakage when the fuel gas replaces nitrogen or other inert gases is reduced. And detecting the hearth pressure of the heating furnace, if the hearth pressure exceeds a third preset threshold value, interrupting ignition, keeping the pressure in the hearth within a safety limit value, and reducing the safety risk of gas leakage caused by overhigh pressure in the hearth.
Drawings
FIG. 1 is a schematic flow chart of a method for protecting the ignition safety of a heating furnace according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the present embodiment provides a safety protection method for ignition of a heating furnace, which is used for performing safety protection and reducing safety risk when the heating furnace is ignited, and includes the following steps:
analyzing the atmosphere in the heating furnace, and if the concentration of the fuel gas in the heating furnace exceeds a first preset threshold value, interrupting ignition;
monitoring the flow of the gas supply main pipe and the flow of the diffusion pipe respectively, and if the duration that the flow of the gas supply main pipe is larger than the flow of the diffusion pipe is larger than a second preset threshold value, interrupting ignition;
and detecting the pressure in the hearth of the heating furnace, and if the pressure in the hearth exceeds a third preset threshold value, stopping ignition.
Meanwhile, the flow of all the gas supply branch pipes can be monitored, and the flow of the gas supply main pipe, the sum of the flows of the gas supply branch pipes and the flow of the diffusing pipe can be compared. If the flow of the gas supply main pipe exceeds the sum of the flows of all the gas supply branch pipes or the sum of the flows of all the gas supply branch pipes exceeds the flow of the diffusing pipe, the situation that leakage exists at a certain position of the gas supply branch pipes or the gas supply main pipe is indicated, and ignition is interrupted. Meanwhile, the leakage position can be judged according to the comparison result among the flow of the gas supply main pipe, the sum of the flow of the gas supply branch pipes and the flow of the diffusion pipe, and the leakage troubleshooting workload is reduced.
And presetting a sixth preset threshold, wherein the sixth preset threshold is smaller than the first preset threshold, and if the concentration of the fuel gas in the heating furnace exceeds the sixth preset threshold, sending an alarm signal to remind an operator of paying attention. In practical situations, a burner is arranged in a hearth of the heating furnace, the gas supply pipeline is communicated with the burner, and when the burner works, the gas supply pipeline supplies gas to the burner and then burns in the hearth. And a hand valve is arranged on the burner and used for opening and closing the supply of the gas of the burner.
When firing a furnace, it generally comprises the following steps:
(1) the gas supply duct is cleaned, and the gas in the gas supply duct is replaced. The gas supply pipeline comprises a main gas supply pipe, a branch gas supply pipe and a diffusing pipe.
When the fuel gas supply pipeline is cleaned, the method comprises the following steps of firstly introducing stable and non-reversible gas such as nitrogen or inert gas at normal temperature into the fuel gas supply pipeline, and discharging the air remained in the fuel gas supply pipeline through a bleeding valve. In the embodiment, nitrogen is adopted, and the nitrogen can not react with air or fuel gas under the conventional condition, so that the method is safe, stable and pollution-free, wide in source, low in price and suitable for industrial large-scale application. And continuously introducing the nitrogen into the gas supply pipeline for a period of time until the air in the gas supply pipeline is completely discharged, introducing the gas into the gas supply pipeline, and discharging the nitrogen in the gas supply pipeline through the diffusion pipe under the action of the gas. And (4) continuously introducing the fuel gas for a period of time until the nitrogen in the fuel gas shutdown pipeline is completely discharged, and closing the diffusing pipe to complete the cleaning of the fuel gas supply pipeline.
When the gas supply pipeline is cleaned, the flow of the gas supply main pipe and the flow of the diffusion pipe are respectively monitored, if the flow of the gas supply main pipe is larger than the flow of the diffusion pipe, an alarm signal is sent out, and meanwhile, if the flow of the gas supply main pipe is larger than the flow of the diffusion pipe, the ignition is interrupted. In this embodiment, the second preset threshold is 30s, that is, if the flow rate of the gas supply main pipe is greater than the flow rate of the diffusing pipe and the duration is greater than 30s, the quick-switching valve of the gas supply main pipe is immediately cut off, and the ignition is interrupted.
(2) And after the cleaning of the gas supply pipeline is finished, opening a blind plate valve on the gas supply pipeline to enable the gas to enter an inner pipe in the heating furnace and be communicated with the burner so as to prepare for ignition.
(3) And after the gas enters the inner tube of the heating furnace, sampling the gas in the hearth of the heating furnace, and then analyzing the explosion gas, wherein if the analysis of the explosion gas is unqualified, the ignition is interrupted. And if the analysis of the explosion gas is qualified, opening a hand valve on the burner to perform ignition action, and finishing ignition.
In this embodiment, the fuel gas is carbon monoxide. The first preset threshold value is 50ppm, the sixth preset threshold value is 24ppm in the ignition process, a laser combustion analyzer is arranged corresponding to a hearth of the heating furnace, the laser combustion analyzer can be used for analyzing the atmosphere in the heating furnace, when the content of the carbon monoxide generated in the heating furnace is between 24ppm and 50ppm, an alarm signal is sent out through a display device, a buzzer and other devices, when the content of the carbon monoxide generated in the heating furnace exceeds 50ppm, a quick-cut valve of a gas supply main pipe is cut off, and ignition is interrupted.
In the ignition process, in order to ensure that the gas in the hearth does not leak to the outer area of the heating furnace, the hearth of the heating furnace is ensured to be in a negative pressure state through modes such as flue air draft and the like. Therefore, the pressure in the hearth of the heating furnace is monitored in the ignition process, a third preset threshold value is preset according to the actual condition of the heating furnace, and if the third preset threshold value of the pressure in the hearth is detected, the quick-switching valve of the fuel gas supply main pipe is immediately cut off to stop ignition. Meanwhile, a seventh preset threshold value can be preset, the seventh preset threshold value is smaller than the third preset threshold value, and if the pressure of the hearth of the heating furnace exceeds the seventh preset threshold value, an alarm signal is sent out in modes of screen display, buzzing alarm and the like to remind an operator of paying attention. In this embodiment, the third preset threshold is 0pa, and the seventh preset threshold is-5 pa.
Meanwhile, a combustion-supporting fan is started before ignition is started, combustion-supporting gas is continuously supplied into the hearth of the heating furnace, and the supplied combustion-supporting gas is exhausted from a flue after passing through the hearth. If the gas exists in the hearth of the heating furnace, the concentration of the gas in the hearth of the heating furnace can be reduced, and explosion is prevented from occurring during ignition. Therefore, the supply pressure of the combustion-supporting gas can be monitored, and if the supply pressure of the combustion-supporting gas is lower than a fourth preset threshold value, the ignition is interrupted. Meanwhile, the flow of the air draft of the flue is required to be larger than the supply of the combustion-supporting gas, so that the heating furnace is in a negative pressure state. In this embodiment, the fourth preset threshold is 7 kpa. The combustion-supporting gas is air which is easy to obtain, the cost is low, and the method is suitable for industrial production.
As mentioned above, the ignition safety protection method for the heating furnace provided by the invention has the following beneficial effects: because the concentration of the fuel gas in the heating furnace is monitored, the ignition is interrupted when the concentration of the fuel gas exceeds a preset threshold value, the safety risk after the concentration of the fuel gas exceeds the safety limit value in the ignition process of the heating furnace can be effectively reduced, if the duration that the flow of the fuel gas supply main pipe is larger than the flow of the diffusing pipe is larger than a second preset threshold value, the ignition is interrupted, and the safety risk caused by fuel gas leakage when the fuel gas replaces nitrogen or other inert gases is reduced. And detecting the hearth pressure of the heating furnace, if the hearth pressure exceeds a third preset threshold value, interrupting ignition, keeping the pressure in the hearth within a safety limit value, and reducing the safety risk of gas leakage caused by overhigh pressure in the hearth.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A safety protection method for ignition of a heating furnace is characterized by comprising the following steps:
analyzing the atmosphere in the heating furnace, and if the concentration of the fuel gas in the heating furnace exceeds a first preset threshold value, interrupting ignition;
respectively monitoring the flow of the gas supply main pipe and the flow of the diffusion pipe, and if the flow of the gas supply main pipe is larger than the flow of the diffusion pipe, interrupting ignition;
and detecting the hearth pressure of the heating furnace, and if the hearth pressure exceeds a third preset threshold value, interrupting ignition.
2. The method for protecting ignition safety of a heating furnace according to claim 1, further comprising the steps of: and supplying combustion-supporting gas into the heating furnace before ignition, and interrupting ignition if the pressure of the combustion-supporting gas is lower than a fourth preset threshold value.
3. The method for protecting ignition safety of a heating furnace according to claim 1, further comprising the steps of: and monitoring the flow of all the gas supply branch pipes, and if the flow of the gas supply main pipe exceeds the sum of the flow of all the gas supply branch pipes, interrupting ignition.
4. The method for protecting ignition safety of a heating furnace according to claim 1, further comprising the steps of: and if the concentration of the fuel gas in the heating furnace exceeds a sixth preset threshold value, sending an alarm signal, wherein the sixth preset threshold value is smaller than the first preset threshold value.
5. The method for protecting ignition safety of a heating furnace according to claim 1, further comprising the steps of: and if the hearth pressure of the heating furnace exceeds a seventh preset threshold value, sending an alarm signal, wherein the seventh preset threshold value is smaller than the third preset threshold value.
6. A heating furnace ignition safety protection method according to claim 1, characterized in that: the fuel gas is carbon monoxide, and the first preset threshold value is 50 ppm.
7. The heating furnace ignition safety protection method according to claim 4, characterized in that: the fuel gas is carbon monoxide, and the sixth preset threshold value is 24 ppm.
8. A heating furnace ignition safety protection method according to claim 1, characterized in that: the third preset threshold is 0 pa.
9. A heating furnace ignition safety protection method according to claim 1, characterized in that: the seventh preset threshold is-5 pa.
10. A heating furnace ignition safety protection method according to claim 2, characterized in that: the fourth preset threshold is 7 kpa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111591315.4A CN114278962A (en) | 2021-12-23 | 2021-12-23 | Heating furnace ignition safety protection method |
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| CN202111591315.4A CN114278962A (en) | 2021-12-23 | 2021-12-23 | Heating furnace ignition safety protection method |
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| CN114278962A true CN114278962A (en) | 2022-04-05 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002522897A (en) * | 1998-08-05 | 2002-07-23 | パーシス テクノロジー リミテッド | Small external torch assembly for semiconductor processing |
| CN202092320U (en) * | 2011-06-03 | 2011-12-28 | 中国石油化工股份有限公司 | In-furnace combustible gas monitoring and alarming device for fuel gas heating furnace |
| CN106907737A (en) * | 2017-04-13 | 2017-06-30 | 大庆海啸机械设备制造有限公司 | A kind of novel hierarchical lighting-off torch |
| CN110736107A (en) * | 2019-11-18 | 2020-01-31 | 云南天朗能源科技有限公司 | Safety ignition control system and control method for heating furnace burners |
| CN111336543A (en) * | 2020-03-06 | 2020-06-26 | 大峘集团有限公司 | Automatic ignition method for sintering flue gas denitration heating furnace |
| CN112413640A (en) * | 2020-11-23 | 2021-02-26 | 上海轻叶能源股份有限公司 | Intelligent gas burner ignition system |
-
2021
- 2021-12-23 CN CN202111591315.4A patent/CN114278962A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002522897A (en) * | 1998-08-05 | 2002-07-23 | パーシス テクノロジー リミテッド | Small external torch assembly for semiconductor processing |
| CN202092320U (en) * | 2011-06-03 | 2011-12-28 | 中国石油化工股份有限公司 | In-furnace combustible gas monitoring and alarming device for fuel gas heating furnace |
| CN106907737A (en) * | 2017-04-13 | 2017-06-30 | 大庆海啸机械设备制造有限公司 | A kind of novel hierarchical lighting-off torch |
| CN110736107A (en) * | 2019-11-18 | 2020-01-31 | 云南天朗能源科技有限公司 | Safety ignition control system and control method for heating furnace burners |
| CN111336543A (en) * | 2020-03-06 | 2020-06-26 | 大峘集团有限公司 | Automatic ignition method for sintering flue gas denitration heating furnace |
| CN112413640A (en) * | 2020-11-23 | 2021-02-26 | 上海轻叶能源股份有限公司 | Intelligent gas burner ignition system |
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