CN211902376U - Gas output system with stable heat value - Google Patents
Gas output system with stable heat value Download PDFInfo
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- CN211902376U CN211902376U CN202020292296.XU CN202020292296U CN211902376U CN 211902376 U CN211902376 U CN 211902376U CN 202020292296 U CN202020292296 U CN 202020292296U CN 211902376 U CN211902376 U CN 211902376U
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Abstract
The utility model relates to a gas application technique field especially relates to a stabilize gas output system of calorific value, including a gas governing valve, a gas flowmeter, two governing valves of gas, gas two flowmeters, calorific value appearance and PLC, a gas governing valve and a gas flowmeter locate on the gas pipeline, two governing valves of gas and gas two flowmeters locate on the gas pipeline, the calorific value of a gas is higher than gas two, is equipped with the calorific value appearance on the gas mixing pipe, calorific value appearance output is connected with the PLC electricity. Compared with the prior art, the utility model has the advantages that: the liquefied gas mixed air can be completely used as alternative energy to replace natural gas in areas with insufficient natural gas supply or areas without natural gas, the situation of insufficient natural gas supply can be effectively relieved, and the method has great significance for reducing the production cost of industrial enterprises.
Description
Technical Field
The utility model relates to a gas application technique field especially relates to a stabilize calorific value's gas output system.
Background
In modern industrial furnaces (such as metallurgical heating furnaces, glass industrial heating furnaces and ceramic industrial heating furnaces), fuel gas is mostly used as heating fuel, one furnace may use a plurality of burners, each burner outlet is provided with a fuel gas nozzle, and the fuel gas nozzle of one general structure type needs to correspond to the fuel gas with a certain fixed heat value to obtain an optimal combustion ratio, so that the purposes of controlling combustion efficiency and improving the heating quality of products are achieved.
So far, natural gas in China is far from being used by residents in daily life. In the peak of supper gas consumption in winter, the time-saving period and the like, the natural gas supply amount is far from shortage, especially in the rural areas far away from cities and villages with hundreds of and thousands of households, the natural gas can not be supplied at all, and for the situation, most urban gas enterprises use liquefied gas mixed air (air mixed air for short), namely the liquefied gas is gasified and the air is mixed into air mixed air close to the natural gas whiteness index according to the proportion to replace the natural gas. However, the different heat values of the air-fuel mixture mixed according to a fixed proportion caused by different liquefied gas components from different sources or batches affect the quality and safety of the residential gas. And part of urban gas enterprises use coal bed gas (such as produced by Liaoning shun gas company) mixed air (also called air mixed gas for short) for residents to use, but the heat value of the coal bed gas fluctuates greatly due to different methane contents, and the quality and safety of the gas used by the residents are also influenced by the air mixed gas mixed with the air according to a fixed ratio.
Different from civil use, the industrial application of fuel gas has higher requirements on economy and safety, and 2300kCal/Nm is required to be used in a certain steel rolling heating furnace process3Blast furnace gas with heat value, coke oven gas mixed gas (blast and coke mixed gas for short), blast furnace gas from iron-making plant with heat value of 718-837 kCal/Nm3The heat value of the coke oven gas from the coke-oven plant fluctuates between 4000 and 4500kCal/Nm3. The existing heating furnaces are all formed by mixing coke oven gas and blast furnace gas in a fixed proportion and then adding a fixed amount of air. When the fluctuation of the coke oven gas is large, the fluctuation of the actual air excess coefficient of the combustion of the blast furnace gas and the coke oven gas mixed gas in the oven can be caused, and the air-fuel ratio is unreasonable. When the air-fuel ratio is small, the furnace temperature is low, and when the air-fuel ratio is large, the flue gas can take away heat, so that energy is wastedThe cost is increased, and the over-combustion and under-combustion affect the combustion quality. Due to the diversity of the types of the fuel gas and the instability of the heat value of the fuel gas, no satisfactory solution is provided at present, and the stable heat value output of various fuel gases is realized.
Disclosure of Invention
The utility model aims at providing a stabilize gas output system of calorific value, overcome the not enough of prior art, adopt calorific value appearance or hua bai appearance and PLC to constitute closed-loop control return circuit, avoid changing the operation to the combustor because of the change of gas calorific value brings, stabilize the use of gas, make the area that winter natural gas supply is not enough in the north or the natural gas supply can not be arrived realize the method that the gas mixes the air and replace the natural gas with liquefied gas safely and stably, perhaps solve the steel mill, the problem of the gas economy substitution and the accurate control of production in glass furnace or the ceramic furnace kiln, alleviate the supply shortage situation of industry and civilian gas in the current social economy.
In order to achieve the above object, the utility model adopts the following technical scheme:
the fuel gas output system for stabilizing the calorific value is characterized by comprising a first fuel gas regulating valve, a first fuel gas flowmeter, a second fuel gas regulating valve, a second fuel gas flowmeter, a calorific value instrument and a PLC (programmable logic controller), wherein the first fuel gas regulating valve and the first fuel gas flowmeter are arranged on a first fuel gas pipeline, the second fuel gas regulating valve and the second fuel gas flowmeter are arranged on a second fuel gas pipeline, the calorific value of the first fuel gas is higher than that of the second fuel gas, the first fuel gas pipeline and the second fuel gas pipeline are combined into a mixed gas pipe at a junction, the position, which is 20 times of the pipe diameter away from the junction, of the mixed gas pipe is provided with the calorific value instrument, and.
The first gas regulating valve is any one of a manual regulating valve, a pneumatic regulating valve or an electric regulating valve.
The gas two regulating valve is a manual regulating valve or an electric regulating valve.
The first fuel gas pipeline is any one of coke oven gas, liquefied gas or natural gas pipeline.
The gas secondary pipeline is any one of blast furnace gas, coal bed gas, water gas or an air pipeline.
The mixed gas is matched with the requirements of a civil gas stove, a steel mill heating furnace, a glass furnace or a ceramic furnace.
And a flue gas analyzer is arranged in a tail gas chimney of the glass furnace or the ceramic furnace, and the output of the flue gas analyzer is connected with the PLC.
The utility model discloses a theory of operation is: the Huabai index of the fuel gas is measured in real time at a distance 20 times the diameter of a mixed gas pipeline away from a merging point of two gas mixing points, and the fuel gas can be replaced by fuel gas energy sources as long as the fuel gas mixed gas has the same Huabai index and the same fuel gas pressure is generated in front of a fuel gas nozzle (or a fuel gas appliance), so that the same heat load can be released. The Huabai index is a gas interchangeability parameter, also called thermal load, which is the heat value of the measured gas divided by the relative density (i.e. gas density and air density 1.293 kg/Nm)3Compared) to the square root.
Compared with the prior art, the beneficial effects of the utility model are that: 1) the air-mixed gas can replace natural gas as alternative energy completely by liquefied gas-mixed gas for areas with insufficient natural gas supply or areas with insufficient natural gas supply, can effectively relieve the tension situation with insufficient natural gas supply, the air-mixed gas can also be used as the supplementary air supply of urban gas pipe network when using the gas peak, play the peak regulation effect, if substitute natural gas with the air-mixed gas, can make things convenient for industrial user not to influence production level and product quality when the natural gas is insufficient, also can make the city use gas peak or festival holiday use gas peak time reserve air supply. 2) As the white index of the air mixed gas is close to the white index of the natural gas, the user can avoid changing the original natural gas burner (or gas stove) when using the air mixed gas, thereby being convenient for the user to use. 3) For the application occasions of the industrial gas, the proportion of the industrial gas can be flexibly adjusted according to the gas price, the normal operation of production can be ensured, the gas flow control is more accurate, and the method has great significance for reducing the production cost of industrial enterprises.
Drawings
Fig. 1 is a schematic block diagram of a state structure of a domestic gas application according to an embodiment of the present invention.
FIG. 2 is a schematic block diagram of a gas application state structure of a heating furnace of a steel plant according to an embodiment of the present invention.
FIG. 3 is a schematic block diagram of the gas application state structure of a three-glass kiln or a ceramic kiln according to an embodiment of the present invention.
Detailed Description
The following embodiments are further described in detail:
see fig. 1, be the embodiment of the utility model provides a civil gas application state structure schematic block diagram, to 1 air feed in-process of resident's user natural gas cooking utensils, gaseous state liquefied gas is gas one, the air is gas two, be equipped with air regulating valve 2 and air flowmeter 3 on the air pipeline, be equipped with liquefied gas regulating valve 4 and liquefied gas flowmeter 5 on the gaseous state liquefied gas pipeline, air and gaseous state liquefied gas mix the back (be for air gas mixture) give natural gas cooking utensils 1 air feed, be equipped with calorific value appearance 6 on the gas mixture pipeline, be equipped with air regulating valve 2 and air flowmeter 3 on the air pipeline, be equipped with liquefied gas regulating valve 4 and liquefied gas flowmeter 5 on the liquefied gas pipeline, air regulating valve 2, air flowmeter 3, liquefied gas regulating valve 4 and liquefied gas flowmeter 5 all are connected with PLC 35. The heat value instrument 6 of the junction point A measures the accurate heat value of the fully mixed gas. Because the sources of the liquefied gases purchased in each batch are different, the contents of propane and butane are different, the heat values are different, the heat value of the air mixed gas is monitored in real time by using a heat value instrument 6 and is sent to a PLC7, the PLC7 calculates and displays the flow ratio of the air and the gaseous liquefied gas, and at the moment, the liquefied gas regulating valve 4 is regulated, so that the whiteness index of the output air mixed gas is as close as possible to the whiteness index value of the natural gas, and the use requirements of residential users are met. The adjustment process can be manually adjusted by an operator according to the display of the PLC7, and the PLC7 can adjust the liquefied gas adjusting valve 4 according to the use amount of a user in various common closed-loop control modes in the prior art, so that the output Huabai index of the air-mixed gas reaches the value required by a user cooker.
Taking the commonly used liquefied gas of 60% propane and 40% butane as an example, the density in the known gaseous state is about 2.29kg/Nm3The average calorific value of natural gas per cubic meter after combustion is known to be 8300kCal/Nm3The average specific gravity of the natural gas is 0.6, and the average Hua-Bai index of each cubic meter of the natural gas after combustion is
The heat value of the burnt liquefied gas per cubic meter is known to be 25172kCal/Nm3Air density 1.293kg/Nm3The average Huabai index per cubic meter of the liquefied gas after combustion is
The specific gravity of the mixed air and the mixed gas is calculated according to the mixing of 50 percent of air volume and 50 percent of gasified gaseous liquefied gas
The air-mixed gas has a Huabai index of
。
From the above calculation, it can be concluded that the air-mixed gas woolly white index obtained by mixing 50% of the gas with 50% of the air is close to the woolly white index of natural gas, that is, the same combustion thermal efficiency can be obtained by using the air-mixed gas without changing any operating conditions for the furnace appliance using natural gas, so that the natural gas can be completely replaced by the air-mixed gas.
See fig. 2, which is a schematic block diagram of a gas application state structure of a heating furnace of a steel plant according to an embodiment of the present invention, the heating furnace of the steel plant often uses a mixed gas of coke oven gas (gas one) and blast furnace gas (gas two), the fluctuation of the heat value of the blast furnace gas from a general iron plant is small, but the fluctuation of the coke oven gas produced by the coke plant is large in the range of 3800 plus 4300kCal/Nm3, and the regulating valve structures and components are controlled in a closed-loop control manner by a PLC, a heat value meter, a flowmeter, etc., so as to obtain any blast furnace-coke oven gas mixed gas with the set heat value Q according to the process requirements of the heating furnace.
For example, blast furnace gas with a heat value of 718-837 kCal/Nm3 fluctuation and blast furnace gas with a heat value of 4000-4500 kCal/Nm are required to be used in a certain steel rolling heating furnace 8 process3Fluctuating coke oven gas mixingThe calorific value is 2300kCal/Nm3The large fluctuation of the heat value of the coke oven gas can cause the fluctuation of the actual excess air coefficient of the combustion of the high and coke mixed gas in the oven, thereby causing the unreasonable air-fuel ratio. When the air-fuel ratio is small, the furnace temperature is low, and when the air-fuel ratio is large, the flue gas can take away heat, the energy is wasted, and the cost is improved, so that the heat value of the high-coke mixed gas is accurately adjusted, the method has great significance for reducing the production cost of industrial enterprises, the optimal air-fuel ratio can be achieved, the energy is saved, and the heating quality is improved.
See fig. 3, it is the schematic block diagram of the gas application state structure of the third glass kiln 14 or the ceramic kiln of the embodiment of the present invention, the glass kiln 14 or the ceramic kiln has a high requirement for the accuracy of the heat value of the gas, in order to realize that when the fluctuation of the heat value of the air-mixed gas (wherein: the first gas is the liquefied gas in the gaseous state, and the second gas is the air) exceeds the heat value range required by the production process, the flow ratio can be quickly adjusted according to the display of the PLC7, so that the heat value of the air-mixed gas is stable, the flue gas analyzer 15 is added at the diffusing chimney 9 to analyze the oxygen content on line, according to experience, if the oxygen content is greater than 10.5%, the mixed gas is greater than 50%, the opening degree of the liquefied gas regulating valve 4 can be increased, so as to ensure that the.
The gas output system of the above embodiment of the present invention comprises a first gas regulating valve 10, a first gas flowmeter 11, a second gas regulating valve 12, a second gas flowmeter 13, a heat value meter 6 and a PLC7, wherein the first gas regulating valve 10 and the first gas flowmeter 11 are disposed on a first gas pipeline, the second gas regulating valve 12 and the second gas flowmeter 13 are disposed on a second gas pipeline, the heat value of the first gas is higher than that of the second gas, the first gas pipeline and the second gas pipeline are combined into a mixed gas pipe at a junction a, a measuring point is disposed on the mixed gas pipe at a position away from the junction a20 times the diameter distance of the mixed gas pipe, so as to ensure that the mixed gas measured by the heat value meter 6 is accurate after being fully mixed, the heat value meter 6 detects the heat value, the chinese white index and the specific gravity and outputs the specific gravity to the PLC7, the PLC7 calculates the flow ratio K of the first gas and the second gas according to the, wherein the average heat value of the first fuel gas is Q1, the flow rate is F1, the average heat value of the second fuel gas is Q2, the flow rate is F2, and the heat value of the mixed gas is Q mixed, so that the flow rate ratio of the first fuel gas to the second fuel gas is K = F1/F2, and the following formula (1) is obtained according to the law of conservation of energy: KF2 × Q1+ F2 × Q2= (F2 + F1) × Q mix (1)
Substituting F1= KF2 into equation (1), we derive from equation (1): k = [ Q mixed one Q2]/[ Q1 one Q mixed ], the PLC7 adjusts the flow rate of the first fuel gas, the output heat value of the mixed gas is detected by the heat value instrument 6 until the output heat value meets the requirement, and the detection value of the heat value instrument 6 can be used for checking whether the proportion value is set reasonably.
For convenient control, the gas-regulating valve is any one of a manual regulating valve, a pneumatic regulating valve or an electric regulating valve. In the embodiment, the flow of the first fuel gas is adjustable, such as coke oven gas, gaseous liquefied gas or natural gas and the like; the second fuel gas does not need to be subjected to flow adjustment, such as blast furnace gas, coal bed gas, water gas or air.
The above-mentioned embodiments are only specific examples selected for the purpose of illustrating the objects, technical solutions and advantages of the present invention in detail, but should not limit the scope of the present invention, and all modifications, equivalent substitutions and improvements made without departing from the spirit and principles of the present invention should fall within the scope of the present invention.
Claims (7)
1. The fuel gas output system for stabilizing the calorific value is characterized by comprising a first fuel gas regulating valve, a first fuel gas flowmeter, a second fuel gas regulating valve, a second fuel gas flowmeter, a calorific value instrument and a PLC (programmable logic controller), wherein the first fuel gas regulating valve and the first fuel gas flowmeter are arranged on a first fuel gas pipeline, the second fuel gas regulating valve and the second fuel gas flowmeter are arranged on a second fuel gas pipeline, the calorific value of the first fuel gas is higher than that of the second fuel gas, the first fuel gas pipeline and the second fuel gas pipeline are combined into a mixed gas pipe at a junction, the position, which is 20 times of the pipe diameter away from the junction, of the mixed gas pipe is provided with the calorific value instrument, and.
2. The gas output system of stable heating value according to claim 1, wherein the gas-regulating valve is any one of a manual regulating valve, a pneumatic regulating valve or an electric regulating valve.
3. The gas output system with stable heating value according to claim 1, wherein the gas two regulating valve is a manual regulating valve or an electric regulating valve.
4. A stable heating value gas output system as claimed in claim 1, wherein the gas-line is any one of coke oven gas, liquefied gas or natural gas line.
5. The gas output system with stable heat value according to claim 1, wherein the gas two-way pipeline is any one of blast furnace gas, coal bed gas, water gas or air pipeline.
6. A stable calorific gas output system as claimed in claim 1, wherein said mixed gas is matched to civil gas range, steelworks heating furnace, glass kiln or ceramic kiln requirements.
7. The gas output system with stable heat value according to claim 6, wherein a flue gas analyzer is arranged in a tail gas chimney of the glass kiln or the ceramic kiln, and the output of the flue gas analyzer is connected with the PLC.
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| CN202020292296.XU CN211902376U (en) | 2020-03-11 | 2020-03-11 | Gas output system with stable heat value |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215531A (en) * | 2022-07-27 | 2022-10-21 | 信义环保特种玻璃（江门）有限公司 | Method and device for controlling glass production process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215531A (en) * | 2022-07-27 | 2022-10-21 | 信义环保特种玻璃（江门）有限公司 | Method and device for controlling glass production process |
| CN115215531B (en) * | 2022-07-27 | 2024-03-15 | 信义环保特种玻璃（江门）有限公司 | Method and device for controlling glass production process |
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