CN112444326B - Method for calculating heat value of mixed gas - Google Patents
Method for calculating heat value of mixed gas Download PDFInfo
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- CN112444326B CN112444326B CN201910793763.9A CN201910793763A CN112444326B CN 112444326 B CN112444326 B CN 112444326B CN 201910793763 A CN201910793763 A CN 201910793763A CN 112444326 B CN112444326 B CN 112444326B
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- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
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Abstract
The invention discloses a method for calculating a heat value of mixed gas, which comprises the following steps of 1: calculating the time delay T of each single gas in the mixing pipeline Pipe extension The calculation formula is T Pipe extension ＝V Pipeline /F Flow rate of MG 3600 s; step 2: calculating the balance effect of the mixing pipeline on the heat value of the mixed gas; step 2.1: periodically sampling the single gas flow through a flow meter on a conveying pipeline; step 2.2: according to the delay T Pipe extension Delaying the sampling value, and filtering and averaging the delayed flow value; step 2.3: and (3) repeating the step 2.1 to the step 2.2, completing sampling, filtering and averaging of the flow values of all the single gases, and calculating the heat value of the mixed gas according to the flow filtering result. The invention can consider the pipeline factor of the mixed gas before the mixed gas is conveyed to the inlet of a terminal user on the basis of the theoretical calculation of the heat value of the mixed gas, thereby improving the accuracy of the theoretical calculation and being beneficial to the combustion control of the subsequent mixed gas.
Description
Technical Field
The invention relates to a coal gas mixed measurement and control method, in particular to a calculation method of a mixed coal gas heat value.
Background
The process links widely existing in various industrial enterprises are that various single gases with different components and different heat values are mixed to generate mixed gas with a specific heat value and then the mixed gas is conveyed to various users. The main single gases in the metallurgical industry include Blast Furnace Gas (BFG), Coke Oven Gas (COG), converter gas (LDG) and Natural Gas (NG). The balance means of the enterprise gas system can be enriched by realizing different combinations among several kinds of single gas, and the method has obvious effects of improving the gas utilization efficiency and reducing the energy loss of ineffective diffusion. However, because of the large difference between the calorific value and the density of several single gases, the different kinds of combinations and different combination ratios can cause the fluctuation of the calorific value of the mixed gas. Therefore, the calorific value of the mixed gas needs to be accurately grasped so as to correct the mixing adjustment process before mixing and the combustion use process after mixing.
At present, the heat value of the mixed gas is mainly obtained in two ways in practical application. One is theoretical calculation: the theoretical calculation is calculated by combining the ratios of the single coal gas and the mixed coal gas, and the calculation formula is MG _ CALO ═ BFG heat value RB + COG heat value RC + LDG heat value RL + NG heat value RN. The other is measured by a heat value meter: the heat value instrument directly burns gas proportioning air in a combustion chamber, detects the temperature difference between combustion exhaust gas and supply air at the inlet of the combustion chamber, calculates the heating index of the gas, namely the Hua-Bai index (WI), according to the flow rate of the gas and the air, and calculates the heat value of the gas through density correction according to the relationship that the Hua-Bai index is the square root of the heat value of the measured gas divided by the relative density, namely the Hua-Bai index is the heat value/√ relative density.
Although the heat value meter can accurately measure the actual heat value of the mixed gas, the following main problems exist in the practical application:
1. it is expensive.
2. The maintenance amount is large. Due to the presence of various impurities in the gas, the heat value meter requires a set of pretreatment devices for gas filtration, and the filtration devices are usually maintained daily.
3. The calculation error is large. The heat value meter needs to be preprocessed, so that a large delay exists after combustion, detection and calculation, and the time lag is generally several minutes.
4. The reliability and stability are poor. Due to the influence of the quality of the coal gas, factors such as blockage in a pretreatment link, fire caused by pressure fluctuation, easy damage of a combustion part due to long-term high temperature and the like can cause poor stability of the heat value instrument, so that the overall effect of detection of the heat value instrument in the domestic metallurgical industry is poor.
Because the heat value instrument has the defects in practical application, a simple and economic heat value detection method is theoretically calculated in a practical application scene, and the method is widely applied to various gas mixing devices. However, in the theoretical calculation formula MG _ CALO ═ BFG heating value RB + COG heating value RC + LDG heating value RL + NG heating value RN, the actual ratio of each single gas is determined by the respective gas flow rate measurements. The gas flow is influenced by valve control action, pressure fluctuation and the like, so that instantaneous disturbance often occurs, the calculated heat value is also synchronously fluctuated, but the actual heat value is not fluctuated greatly, the theoretical calculation error is caused, and the subsequent mixed gas combustion control is adversely influenced.
Disclosure of Invention
The invention aims to provide a method for calculating the heat value of mixed gas, which can consider the pipeline factor before the mixed gas is conveyed to an inlet of a terminal user on the basis of theoretically calculating the heat value of the mixed gas, improve the accuracy of theoretical calculation and be beneficial to the combustion control of the subsequent mixed gas.
The invention is realized by the following steps:
a method for calculating the calorific value of mixed gas is realized based on a detection system of a mixed gas device, wherein the detection system comprises a plurality of gas conveying pipelines, a mixed pipeline and a user side, and the plurality of gas conveying pipelines respectively convey single gas into the mixed pipeline to be fully mixed and conveyed to the user side; the gas conveying pipelines are provided with flow meters and regulating valves, and the real-time flow measured by the flow meters on the gas conveying pipelines is respectively F1, F2, F3 and F4 … …; the proportion R of each single coal gas to the total mixed coal gas is respectively as follows:
R1＝F1/(F1+F2+F3+F4)；
R2＝F2/(F1+F2+F3+F4)；
R3＝F3/(F1+F2+F3+F4)；
R4＝F4/(F1+F2+F3+F4)；
……；
the heat value of the mixed gas is MG, namely the first gas heat value R1, the second gas heat value R2, the third gas heat value R3 and the fourth gas heat value R4+ … …;
the calculation method comprises the following steps:
step 1: calculating the time delay T of the mixed gas in the mixing pipeline Pipe extension The calculation formula is as follows:
T pipe extension ＝V Pipeline /F Flow rate of MG *3600s
Wherein, V Pipeline Volume of mixing conduit, F Flow rate of MG The current flow of the mixed gas is;
and 2, step: and calculating the balance effect of the mixing pipeline on the heat value of the mixed gas.
The step 2 also comprises the following sub-steps:
step 2.1: periodically sampling the single gas flow through a flow meter on a conveying pipeline;
step 2.2: according to the delay T Pipe extension Delaying the sampling value, and filtering and averaging the delayed flow value;
step 2.3: and (3) repeating the step (2.1) to the step (2.2), completing sampling, filtering and averaging of the flow values of all the single gases, and calculating the heat value of the mixed gas according to the flow filtering result, wherein the calculation formula is as follows:
the mixed gas heating value MG is the first gas heating value R1+ the second gas heating value R2+ the third gas heating value R3+ the fourth gas heating value R4+ … ….
In step 2.1, the sampling period ranges from 50ms to 200 ms.
The specific steps of the filtering calculation are as follows:
step 2.2.1: determining the maximum deviation value allowed by the two times of sampling, wherein the maximum deviation value is set as X;
step 2.2.2: judging whether the deviation value between the current sampling value and the last sampling value is less than or equal to X, if so, executing the step 2.2.3, and if not, executing the step 2.2.4;
step 2.2.3: the sampling value is valid, and the step 2.2.5 is carried out by adopting the sampling value;
step 2.2.4: and if the sampling value is invalid, discarding the sampling value, and replacing the sampling value with the sampling value of the last time.
The value range of the maximum deviation value X is 5-10%.
In the step 2.2.4, if the sampling values are discarded for several consecutive times, it indicates that the sampling values have no abrupt change, and the discarded sampling values are considered as valid values.
When the sampling value is continuously discarded for more than 10 times, the sampling value is not suddenly changed, and the discarded sampling value is considered as a valid value.
The average calculation comprises the following specific steps:
step 2.2.5: forming stack data by continuous N sampling values, putting new data obtained by each sampling into the tail of the stack data queue, and discarding one data at the head of the original stack data queue;
step 2.2.6: and performing arithmetic average operation on new stack data formed after each sampling to obtain a single gas flow filtering result after the sampling.
The invention can consider the pipeline factors before the mixed gas is conveyed to the inlet of the end user, namely the delay effect of the pipeline and the balance effect of the pipeline on the gas heat value, on the basis of theoretically calculating the heat value of the mixed gas, thereby avoiding the transient disturbance error, effectively improving the accuracy of theoretical calculation, being beneficial to the combustion control of the subsequent mixed gas and having low cost.
Drawings
FIG. 1 is a front view of a detection system of a mixed gas plant;
FIG. 2 is a flow chart of a method of calculating the heating value of the mixed gas of the present invention;
FIG. 3 is a graph comparing a thermal value curve calculated using a theoretical calculation method with a thermal value curve actually measured by a thermal value meter;
fig. 4 is a graph comparing a heat value curve calculated by the calculation method of the present invention with a heat value curve actually measured by a heat value meter.
In the figure, 1 coke oven gas conveying pipeline, 2 blast furnace gas conveying pipeline, 3 converter gas conveying pipeline, 4 natural gas conveying pipeline, 5 mixing pipeline, 6 user end, 7 flow meter, 8 regulating valve and 9 heat value instrument.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached drawing 1, the method for calculating the calorific value of the mixed gas is realized based on a detection system of a mixed gas device, the detection system comprises a plurality of conveying pipelines, such as a Coke Oven Gas (COG) conveying pipeline 1, a Blast Furnace Gas (BFG) conveying pipeline 2, a converter gas (LDG) conveying pipeline 3, a Natural Gas (NG) conveying pipeline 4, a mixing pipeline 5 and a user side 6, the plurality of conveying pipelines respectively convey a single gas into the mixing pipeline 5 to be fully mixed and conveyed to the user side 6, and a flow meter FE 7 and a regulating valve 8 are arranged on each conveying pipeline.
The real-time flow measured by the flow meters FE 7 on the plurality of conveying pipelines is respectively F1, F2, F3 and F4 … …. The proportion of each single coal gas to the total mixed coal gas is respectively as follows:
R1＝F1/(F1+F2+F3+F4)；
R2＝F2/(F1+F2+F3+F4)；
R3＝F3/(F1+F2+F3+F4)；
R4＝F4/(F1+F2+F3+F4)；
……。
the calorific value of the mixed gas is MG ═ first gas calorific value R1+ second gas calorific value R2+ third gas calorific value R3+ fourth gas calorific value R4+ … ….
Referring to fig. 2, the calculation method includes the following steps:
step 1: calculating the time delay T of the mixed gas in the mixing pipeline 5 Pipe extension I.e. the pipeline transportation time from each single gas entering the mixing pipeline 5 to the user terminal 6, the calculation formula is as follows:
T pipe extension ＝V Pipeline /F Flow rate of MG *3600s。
Wherein, V Pipeline Is the volume of the mixing duct 5, F Flow rate of MG The current flow of the mixed gas.
Step 2: and calculating the balance effect of the mixing pipeline 5 on the heat value of the mixed gas. The method comprises the following steps of simulating filtering and averaging of a theoretical calculation heat value through a Programmable Logic Controller (PLC), and specifically operating as follows:
step 2.1: the single gas flow is periodically sampled by a flow meter FE 7 on one conveying pipeline, and is used for filtering accidental sudden change values caused by the action of the regulating valve 8 and the like. Preferably, the sampling period ranges from 50ms to 200ms, and the sampling period can be adjusted by the PLC device and the actual sampling requirements.
Step 2.2: according to the delay T Pipe extension And delaying the sampling value, and filtering and averaging the delayed flow value.
Step 2.3: and (3) repeating the step (2.1) to the step (2.2), completing sampling, filtering and averaging of the flow values of all the single gases, and calculating the heat value of the mixed gas according to the flow filtering result, wherein the calculation formula is as follows:
the mixed gas heating value MG is the first gas heating value R1+ the second gas heating value R2+ the third gas heating value R3+ the fourth gas heating value R4+ … ….
The specific steps of the filtering calculation are as follows:
step 2.2.1: and determining the maximum deviation value allowed by the two times of sampling, wherein the maximum deviation value is set as X, and preferably, the value range of X is 5-10%.
Step 2.2.2: and judging whether the deviation value between the current sampling value and the last sampling value is less than or equal to X, if so, executing the step 2.2.3, and if not, executing the step 2.2.4.
Step 2.2.3: and if the current sampling value is valid, adopting the current sampling value and turning to the step 2.2.5.
Step 2.2.4: and if the sampling value is invalid, discarding the sampling value, and replacing the sampling value with the sampling value of the last time.
If a sample value is discarded several times in succession, which indicates that the sample value has no abrupt change, the discarded sample value should be considered as a valid value and the stack data is introduced. For example: according to the actual change rate of the gas flow, 10 continuous sampling values are discarded, so that the sampling values are not suddenly changed, and the 10 sampling values are used as effective values to be introduced into the stack data.
The average calculation comprises the following specific steps:
step 2.2.5: and (3) forming the continuous N sampling values into stack data, putting new data obtained by each sampling into the tail of the stack data queue, and discarding one data at the head of the original stack data queue (namely adopting a first-in first-out principle). The first-in-first-out principle is still used when a plurality of discarded sampling values are introduced.
Step 2.2.6: and performing arithmetic mean operation on new stack data formed after each sampling to obtain a single gas flow filtering result after the sampling, wherein the single gas flow filtering result is used for simulating the balance effect of the mixing pipeline 5.
Example (b):
taking a certain hot rolling pressurizing station as an example, Coke Oven Gas (COG), Blast Furnace Gas (BFG), converter gas (LDG) and Natural Gas (NG) are conveyed into a mixing pipeline 5 through respective conveying pipelines, and a Coke Oven Gas (COG) conveying pipeline 1 and a Blast Furnace Gas (BFG) conveying pipeline2. The real-time flow rates measured by the flow meters FE 7 on the converter gas (LDG) conveying pipeline 3 and the Natural Gas (NG) conveying pipeline 4 are respectively F BFG (i.e., F1), F COG (i.e., F2), F LDG (i.e., F3), F NG (i.e., F4). The proportion of each single coal gas to the total mixed coal gas is respectively as follows:
RB＝F BFG /(F BFG +F COG +F LDG +F NG )；
RC＝F COG /(F BFG +F COG +F LDG +F NG )；
RL＝F LDG /(F BFG +F COG +F LDG +F NG )；
RN＝F NG /(F BFG +F COG +F LDG +F NG )。
the heat value of the mixed gas is MG _ CALO ═ BFG heat value RB + COG heat value RC + LDG heat value RL + NG heat value RN.
After mixing and pressurizing, the mixture is sent to a hot rolling heating furnace, namely a user end 6, and Coke Oven Gas (COG), Blast Furnace Gas (BFG), converter gas (LDG) and Natural Gas (NG) are fully mixed in a mixing pipeline 5 with the length of 200 m. The length of the mixing pipe 5 is 200m, the pipe diameter is DN2200, and the radius is 1.1 m.
The cross-sectional area S ═ tr of the mixing duct 5 2 ＝3.14*1.1 2 ＝3.8m 2 The volume of the mixing duct 5 is V-S-H-3.8-200-760 m 3 The current flow rate of the mixed gas is 70000Nm 3 H is used as the reference value. The time delay T of the mixed gas in the mixing pipeline 5 Pipe extension ＝V Pipeline /F Flow rate of MG *3600＝760/70000*3600＝39s。
The instantaneous fluctuation of the single gas flow before mixing will have an even course in the mixing pipe 5. No matter the instantaneous flow change caused by the active action of the regulating valve 8 or the instantaneous flow change caused by the passive pressure fluctuation in the gas mixing and regulating process, the gas is fully stirred and mixed when passing through the mixing pipeline 5 of 200m and then becomes smooth. The effect of the stirring equalization of the mixing line 5 is analyzed, which is to say that the calorific value of the mixed gas is averaged (moving average) by means of the mixing line 5. In addition, considering the actual amplitude of the change of the gas flow, the sudden change with too large numerical value in the flow detection process has no significance in the process, belongs to the clutter on the data, and is filtered in a certain mode, so that the detected numerical value is closer to the real flow.
A PLC system in the prior art is adopted to respectively sample data of the flow rates of Coke Oven Gas (COG), Blast Furnace Gas (BFG), converter gas (LDG) and Natural Gas (NG) through four flow meters FE 7, the data sampling frequency is 100ms, namely, one data is sampled every 100ms, 900 data are collected in 90s, and the maximum deviation value X is set to be 10%. When the deviation value between the current sampling value and the last sampling value is less than or equal to 10%, the current sampling value is valid, otherwise, the current sampling value is invalid, the current sampling value is discarded, and the last sampling value is adopted to replace the current sampling value to be listed as stack data consisting of N-50 sampling values.
Referring to fig. 3 and 4, a heat value meter 9 is installed between the mixing pipe 5 and the user terminal 6, and the heat value of the mixed gas reaching the user terminal 6 is detected by the heat value meter 9. FIG. 3 is a graph showing a comparison between the measured calorific value (the curve located above the graph) and the theoretically calculated calorific value (the curve located below the graph) of the calorific value meter 9 of mixed gas, wherein the X-axis represents time, the Y-axis represents the calorific value, and the time stamp at the vertical line is 9:21: 58; the theoretical calculated thermal value of the mixed gas at the vertical line time stamp was 9568.78, and the actual thermal value detected by the thermal value meter 9 was 10399.74. FIG. 4 is a graph showing a comparison between the actually measured calorific value (the curve located above the graph) of the calorific value meter 9 of the mixed gas and the calculated calorific value (the curve located below the graph) using the calculation method of the present invention, wherein the X-axis represents time, the Y-axis represents the calorific value, and the time stamp at the vertical line is 10:00: 58; the calculated value of the mixed gas after a delay of 39s was 9833.24. Because the control of the hot rolling heating furnace not only considers the heat value of the coal gas, but also considers the proportion of the synchronously matched air, the air proportion is also synchronously stable after the heat value of the coal gas is stable, and a stable combustion working condition can be formed, the graph is shown in figure 3 and figure 4, in order to clearly distinguish the calculated heat value from the actually measured heat value, the actually measured heat value is slightly higher than the calculated heat value, therefore, whether the shape of the curve is consistent or not is taken as a judgment standard, the theoretically calculated heat value is influenced by the action of the regulating valve 8 and the pressure fluctuation, the fluctuation amplitude of the heat value curve is far larger than the fluctuation amplitude of the actually measured heat value curve, after the calculated heat value is dynamically delayed and averagely processed, the shape of the heat value curve is basically the same as the actually measured heat value of a heat value instrument, the precision of the calculating method of the invention can reach 2 percent on average, and the heat value condition of the coal gas in the pipeline after being fully and uniformly mixed through the mixing pipeline 5 can be truly reflected, is very beneficial to the stable control of the subsequent hot rolling heating furnace.
In the adaptive modification project of the hot rolling gas pressurizing station, the combustion control of the hot rolling heating furnace (user side 6) adopts a theoretical calculation air-fuel ratio and a theoretical calculation heat value sent by a gas station, and the calculation heat value participates in the control of the hot rolling heating furnace. The observation curve shows that the theoretical calculated heat value and the actual measured heat value have a certain advance amount due to the fact that the mixing pipeline 5 with the length of about 200m is arranged between the gas station and the hot rolling factory building. The hot rolling heating furnace corrects the theoretical calculated heat value by adopting the actually measured heat value, and calculates the theoretical calculated air-fuel ratio, and 2 times of disturbance can be generated due to the asynchronous heat value and air-fuel ratio. Therefore, the system and the method for accurately calculating the heat value of the mixed gas are adopted in the gas station, the time delay of the mixing pipeline 5 and the average effect on the heat value are considered, the calculated heat value is synchronous with the actually measured heat value of the heat value instrument 9, the actual heat value of the mixed gas at the inlet of the heating furnace is reflected more truly, and the combustion working condition of the hot rolling heating furnace is improved.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for calculating the calorific value of mixed gas is realized on the basis of a detection system of a mixed gas device, the detection system comprises a plurality of gas conveying pipelines, a mixing pipeline (5) and a user side (6), and the plurality of gas conveying pipelines respectively convey a single gas into the mixing pipeline (5) to be fully mixed and convey the single gas to the user side (6); the gas conveying pipelines are provided with flow meters (7) and regulating valves (8), and the real-time flow measured by the flow meters (7) on the gas conveying pipelines is respectively F1, F2, F3 and F4 … …; the proportion R of each single coal gas to the total mixed coal gas is respectively as follows:
R1＝F1/(F1+F2+F3+F4)；
R2＝F2/(F1+F2+F3+F4)；
R3＝F3/(F1+F2+F3+F4)；
R4＝F4/(F1+F2+F3+F4)；
……；
the heat value of the mixed gas is MG, namely the first gas heat value R1, the second gas heat value R2, the third gas heat value R3 and the fourth gas heat value R4+ … …;
the method is characterized in that: the calculation method comprises the following steps:
step 1: calculating the time delay T of the mixed gas in the mixing pipeline (5) Pipe extension The calculation formula is as follows:
T pipe extension ＝V Pipeline /F Flow rate of MG *3600s
Wherein, V Pipe line Is the volume of the mixing duct (5), F Flow rate of MG The current flow of the mixed gas is;
step 2: calculating the balance effect of the mixing pipeline (5) on the heat value of the mixed gas;
the step 2 also comprises the following sub-steps:
step 2.1: periodically sampling the single gas flow through a flow meter (7) on a conveying pipeline;
step 2.2: according to the delay T Pipe extension Delaying the sampling value, and filtering and averaging the delayed flow value;
step 2.3: and (3) repeating the step (2.1) to the step (2.2), completing sampling, filtering and averaging of the flow values of all the single gases, and calculating the heat value of the mixed gas according to the flow filtering result, wherein the calculation formula is as follows:
the mixed gas calorific value MG is the first gas calorific value R1+ the second gas calorific value R2+ the third gas calorific value R3+ the fourth gas calorific value R4+ … …;
the specific steps of the filtering calculation are as follows:
step 2.2.1: determining the maximum deviation value allowed by the two times of sampling, wherein the maximum deviation value is set as X;
step 2.2.2: judging whether the deviation value between the current sampling value and the last sampling value is less than or equal to X, if so, executing the step 2.2.3, and if not, executing the step 2.2.4;
step 2.2.3: the sampling value is valid, and the step 2.2.5 is carried out by adopting the sampling value;
step 2.2.4: if the sampling value is invalid, discarding the sampling value, and replacing the sampling value with the sampling value of the last time;
the average calculation comprises the following specific steps:
step 2.2.5: forming stack data by continuous N sampling values, putting new data obtained by each sampling into the tail of the stack data queue, and discarding one data at the head of the original stack data queue;
step 2.2.6: and performing arithmetic average operation on new stack data formed after each sampling to obtain a single gas flow filtering result after the sampling.
2. The method for calculating the calorific value of mixed gas according to claim 1, wherein: in step 2.1, the sampling period ranges from 50ms to 200 ms.
3. The method for calculating the calorific value of mixed gas according to claim 1, wherein: the value range of the maximum deviation value X is 5-10%.
4. The method for calculating the calorific value of mixed gas according to claim 1, wherein: in the step 2.2.4, if the sampling values are discarded for several consecutive times, it indicates that the sampling values have no abrupt change, and the discarded sampling values are considered as valid values.
5. The method for calculating the calorific value of mixed gas according to claim 4, wherein: when the sampling value is continuously discarded for more than 10 times, the sampling value is not suddenly changed, and the discarded sampling value is considered as a valid value.
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| JPS5556522A (en) * | 1978-10-19 | 1980-04-25 | Toshiba Corp | Calorific value detecting device |
| JPH06201681A (en) * | 1993-01-11 | 1994-07-22 | Nippon Steel Corp | Method for estimating calorific value and volume of coal gas |
| CN101382448A (en) * | 2008-10-24 | 2009-03-11 | 承德新新钒钛股份有限公司 | Measuring method for mixed gas under complex working condition |
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| CN102654759A (en) * | 2012-04-26 | 2012-09-05 | 本钢板材股份有限公司 | Method for controlling thermal value of mixed gas |
| CN102840888B (en) * | 2012-09-03 | 2014-11-05 | 南京钢铁股份有限公司 | Coal gas flow measuring method based on heat value measurement |
| CN104977394B (en) * | 2015-07-16 | 2018-10-12 | 莱芜市安诺美姿自动化仪表有限公司 | A kind of Gas Components and calorific value on-line measurement device |
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