CN216669859U - System for detecting all-component content in process gas at outlet of methane synthesis reactor - Google Patents
System for detecting all-component content in process gas at outlet of methane synthesis reactor Download PDFInfo
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- CN216669859U CN216669859U CN202122943932.8U CN202122943932U CN216669859U CN 216669859 U CN216669859 U CN 216669859U CN 202122943932 U CN202122943932 U CN 202122943932U CN 216669859 U CN216669859 U CN 216669859U
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Abstract
The utility model belongs to the technical field of methane production equipment, and particularly relates to a system for detecting the content of all components in process gas at the outlet of a methane synthesis reactor, which comprises a sampling cooler, a sample gas separating tank and an online chromatographic analyzer, a sample gas flowmeter, a sample gas total flow regulating valve, a sample gas pressure gauge, a sample gas thermometer and a cooling water flow control valve are arranged on a cooling circulating water upper water pipeline of the sampling cooler on an air inlet pipeline of the sampling cooler, an outlet pipeline of the sampling cooler is connected with the sample gas separating tank, the online chromatographic analyzer, the second pressure gauge, the second thermometer and the second flow meter are arranged on the gas outlet pipeline of the sample gas separation tank.
Description
Technical Field
The utility model belongs to the technical field of methane production equipment, and particularly relates to a system for detecting the content of all components in process gas at an outlet of a methane synthesis reactor.
Background
The methane synthesis process adopts a carbon monoxide methanation synthesis technology, reaction furnaces of the process are respectively filled with nickel-based catalysts, methane synthesis reaction is sequentially carried out in a plurality of reaction furnaces, carbon precipitation reaction of CO can generate simple substance carbon which is attached to the surface of the catalyst and covers active substances playing a catalytic role in the catalyst, so that the activity of the catalyst is reduced; in addition, because the catalyst is a porous structure, the elementary carbon generated by the reaction is accumulated to a certain degree, micropores in the catalyst can be broken, so that the catalyst is cracked, the permeability of a catalyst bed layer is reduced, the air input of a reaction furnace is influenced, the carbon precipitation of the catalyst becomes a key factor for restricting the normal operation of a methane synthesis device, and because the CO2 has a stable structure, the reaction of precipitating the elementary carbon cannot occur, in the methane synthesis process, a certain water content must be ensured to improve the conversion rate of CO in the conversion reaction of the CO, the content of CO2 in reaction gas is ensured, the content of CO is reduced, so that the carbon precipitation reaction is prevented, therefore, the content of each component in the methane reactor needs to be grasped in time to judge whether the reactor contains enough water, if the water content is too low, extra water is added to increase the water content, and the water in the reactor is controlled to be more than 21.95% (volume fraction), in the prior art, process gas component detection is generally manual sampling, in order to prevent high-temperature gas from scalding sampling personnel, the sample gas sampled in a sampler needs to be cooled by circulating cooling water, liquid water is separated by a gas-liquid separator and then extracted, an analyst analyzes the sample gas by using a gas chromatograph, before the sample gas enters the gas chromatograph, in order to ensure the analysis precision, the sample gas is further dried and dehydrated by a drying column filled with water-absorbing substances, so that the water content in the sample gas cannot be detected, only the content of each component in dry-basis sample gas (the sample gas from which water is removed) can be detected, the content of each component in the outlet gas of a main reaction furnace cannot be represented, and a craftsman cannot timely master the content of each component in the outlet gas of the main reaction furnace, so that the water content in the main reaction furnace cannot be ensured, and carbon separation reaction is easily caused.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a system for detecting the content of all components in the process gas at the outlet of a methane synthesis reactor, which can prevent sampling personnel from being scalded, accurately detect the content of each component in the process gas, enable the process personnel to timely judge whether the water content in the furnace meets the process requirements, and prevent the occurrence of carbon deposition reaction.
The purpose of the utility model is realized by the following technical scheme: the system comprises a sampling cooler, a sample gas separation tank and an online chromatographic analyzer, wherein a gas inlet pipeline of the sampling cooler is provided with a sample gas flowmeter, a sample gas total flow regulating valve, a sample gas pressure meter, a sample gas thermometer and a sample gas temperature meter on a gas inlet pipeline of the sampling cooler and is communicated with the methane synthesis reactor through a sampling branch pipe, the sampling branch pipe is provided with a sampling control valve, a cooling water flow control valve is arranged on a cooling circulation water inlet pipeline of the sampling cooler, an outlet pipeline of the sampling cooler is connected with the sample gas separation tank, a wire mesh demister is arranged in the sample gas separation tank, a liquid level meter is arranged on the outer wall of the sample gas separation tank, an online chromatographic analyzer is arranged on an outlet pipeline of the sample gas separation tank, and a second pressure meter is arranged between the sample gas separation tank and the online chromatographic analyzer, A second temperature meter and a second flow meter.
Further, the gas outlet pipeline of the sample gas separation tank is connected to a drying system.
Further, the gas outlet pipeline is connected with a manual closed sampler through a connecting pipe, and a valve is arranged at the inlet of the manual closed sampler.
Furthermore, a condensate flow meter and a liquid level regulating valve for regulating the liquid level of the sample gas separation tank are arranged on a condensate outlet pipeline of the sample gas separation tank.
Further, a sample gas flowmeter, a sample gas total flow regulating valve, a sample gas pressure gauge and a sample gas thermometer on the gas inlet pipeline of the sampling cooler are connected with the DCS control system.
Further, cooling water flow control valve, second manometer, second thermometer, second flowmeter all with DCS control system is connected just DCS control system is connected with human-computer interaction interface and alarm.
Has the advantages that: the utility model can avoid the scalding of sampling personnel, accurately detect the content of each component in the process gas, ensure that the process personnel can judge whether the water content in the furnace meets the process requirements according to the detection result in time, and prevent the occurrence of carbon precipitation reaction.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1: the structure of embodiment 1 of the utility model is schematically shown;
FIG. 2: the structure of embodiment 2 of the utility model is schematically shown.
In the figure: 1. the system comprises a sampling cooler, 2 a sample gas separation tank, 3 an online chromatographic analyzer, 4 a manual closed sampler, 11 a sampling cooler air inlet pipeline, 12 a sample gas flowmeter, 13 a sample gas total flow regulating valve, 14 a sample gas pressure gauge, 15 a sample gas temperature gauge, 16 a sampling branch pipe, 17 a sampling control valve, 18 a cooling circulating water inlet pipeline, 19 a cooling water flow control valve, 21 a wire mesh demister, 22 a liquid level gauge, 23 an air outlet pipeline, 24 a second pressure gauge, 25 a second temperature gauge, 26 a second flow gauge, 27 a condensate flowmeter, 28 a liquid level regulating valve, 41 a valve.
Detailed Description
The following is a detailed description of the present invention for further explanation. The utility model is not limited to the claims, and all equivalent structures or equivalent processes that can be directly or indirectly applied to other related technical fields using the contents of the specification and the drawings are included in the scope of the utility model.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout of the drawings in the specification, such as: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction in the drawings of the specification.
The gas outlet line 23 is connected with a manual closed sampler 4 through a connecting pipe, and a valve 41 is arranged at the inlet of the manual closed sampler 4.
The sampling gas flowmeter 12, the total flow control valve 13 of the sampling gas, the sample gas pressure gauge 14 and the sample gas temperature gauge 15 on the gas inlet pipeline 11 of the sampling cooler 1 are connected with the DCS control system, the cooling water flow control valve 19, the second pressure gauge 24, the second temperature gauge 25 and the second flow gauge 26 are all connected with the DCS control system, and the DCS control system is connected with the human-computer interaction interface and the alarm.
When the utility model is used for detecting the content of all components, the utility model comprises the following steps:
step 2, measuring the total flow of the sample gas: because the gas inlet pipeline 11 of the sampling cooler 1 is provided with a sample gas flowmeter 12, a sample gas total flow regulating valve 13, a sample gas pressure gauge 14 and a sample gas temperature gauge 15, sample gas passes through the sample gas flowmeter, the sample gas volume total flow is detected, and the values measured by the sample gas pressure gauge and the sample gas temperature gauge are combined, the volume total flow under the standard state (101.325 KPa,20 ℃) is converted and expressed by F1 (unit is Nm 3/h), and then the sample gas total flow is regulated and controlled by the sample gas total flow regulating valve to be stabilized at a fixed value;
and step 3, controlling the temperature of an outlet of the sample gas separation tank 2: the sample gas is cooled by the sampling cooler 1, the cooling water flow control valve 19 is adjusted, the temperature of the sample gas at the outlet of the sample gas separation tank 2 is automatically controlled to be at a fixed temperature not higher than 40 ℃ in combination with a display signal of the second thermometer 25, and the liquid water in the sample gas is separated by the wire mesh demister 21 at the upper part of the sample gas separation tank 2, so that the calculation accuracy of the device is prevented from being influenced;
and 4, measuring and calculating the volume fraction of water: because the temperature of the water in the sample gas at the outlet of the sample gas separation tank 2 is not changed, the corresponding saturated vapor pressure is not changed, and because the sample gas contains about 20 percent of water by volume, a large amount of water is separated in the sample gas separation tank; the sample gas after water separation contains saturated water at the current pressure and temperature, the partial pressure of the water in the sample gas at the current pressure is equal to the saturated vapor pressure corresponding to the water at the current temperature, so that the partial pressure of the water in the sample gas at the current pressure is obtained and is represented by P1, the pressure of the sample gas at the outlet of the sample gas separation tank 2 is measured by a second pressure gauge 24 and is represented by P2, and the volume fraction of the water in the sample gas at the outlet of the sample gas separation tank 2 is V1= P1/P2;
and 5, measuring and calculating the total volume flow of water contained in the sample gas: the volume flow of the sample gas at the outlet of the sample gas separation tank 2 under the current temperature and pressure is measured by a second flowmeter 26, and is converted into the volume flow F2 (unit is Nm 3/h) under the standard state (101.325 KPa,20 ℃) by combining a second pressure gauge 24 and a second temperature gauge 25, so that the volume flow of the water in the sample gas at the outlet of the sample gas separation tank 2 is F3= F2V 1= F2P 1/P2; since the sample gas separated a part of water in the sample gas separation tank, F2 < F1, and the volume flow rate of the separated water in the sample gas separation tank was F4= F1-F2, it was found that the total volume flow rate of water contained in the process gas at the outlet of the methane synthesis reactor was F5= F3+ F4= F2P 1/P2+ F1-F2, and thus it was concluded that the volume percentage content of water in the process gas at the outlet of the methane synthesis reactor was V = F5/F1 = (F2P 1/P2+ F1-F2)/F1;
and 6, measuring the content of other components in the sample gas: the sample gas in the gas outlet pipeline 23 is measured by the online chromatographic analyzer 3, and the sample gas is thoroughly dried and dehydrated before entering the chromatographic column, so that the content of each component analyzed by the online chromatographic analyzer 3 is the volume percentage content of each component in the dry base sample gas without water;
in step 6, determination of the methane content: when the volume fraction of methane measured by the sample gas on the line chromatograph 3 is V2, the obtained methane volume flow rate is F8= (F2-F3) × V2, so that it can be deduced that the methane volume content is V3= F8/F1 = (F2-F3) × V2/F1 = (F2-F2 × P1/P2) × V2/F1, and the other component algorithms are the same as in this example;
in order to verify the measurement accuracy of the online chromatographic analyzer 3 in the step 6, sampling is performed manually at the manual closed sampler 4, the chromatograph is replaced for measurement, and the measurement errors of the two are compared to ensure that the errors are within an allowable range; meanwhile, when the online chromatographic analyzer 3 is damaged, the online chromatographic analyzer can be replaced in time by manually sampling at the manual closed sampler 4;
in order to improve the detection and calculation efficiency of the system, all calculation formulas are automatically calculated in a DCS control system through configuration, and calculation results are displayed on a human-computer interaction interface; setting a low water content alarm and a low interlock, wherein when the low alarm occurs, a craftsman timely supplements water, and when the low interlock occurs, the methane synthesis device automatically stops;
in order to avoid waste of the sample gas, the sample gas is finally discharged into a drying system behind the methane synthesis device, and in order to avoid disordered discharge of process condensate, the water separated by the sample gas separation tank 2 is discharged into a process condensate treatment system of the methane synthesis device.
Example 2 referring to fig. 2, as a further optimization design of example 1, a condensate flow meter 27 and a liquid level regulating valve 28 for regulating the liquid level of the sample gas separation tank are arranged on the condensate outlet pipeline of the sample gas separation tank 2, since the measured values of the sample gas flow meter 12 and the second flow meter 26 have a certain range of errors, in order to avoid excessive measurement errors, the total flow rate of the sample gas is controlled by the total flow rate regulating valve 13 to maintain stable, the liquid level of the sample gas separation tank 2 is controlled to be constant by the liquid level regulating valve 28, the flow rate of the separated water in the sample gas separation tank 2 is measured by the condensate flow meter 27, which is expressed by F6 (in kg/h), which is the mass flow rate of water, and the volume flow rate F4= F1-F2 of the separated water in the sample gas separation tank 2 calculated in the synchronization step 5 is compared with the volume Nm of 1mol of the water vapor, which is converted into a standard state of 22.4L =0.022 3, the molecular weight of water was 18g/mol, from which the mass flow rate of water F7= F4 × 18/22.4 (in kg/h) could be obtained; if the difference between the two algorithms is too large, one flowmeter is not accurate and needs to be calibrated in time; in order to find out the problem in time, the error of the two measurement schemes is set as D = (F7-F6)/F7, D is required to be between-0.02 and 0.02, and if the error exceeds the range, an alarm is given in a control system to remind an operator to take relevant measures.
Claims (5)
1. The system is characterized by comprising a sampling cooler, a sample gas separation tank and an online chromatographic analyzer, wherein a sample gas flowmeter, a sample gas total flow regulating valve, a sample gas pressure gauge and a sample gas thermometer are arranged on an air inlet pipeline of the sampling cooler, the sampling cooler is communicated with the methane synthesis reactor through a sampling branch pipe on the air inlet pipeline, a sampling control valve is arranged on the sampling branch pipe, a cooling water flow control valve is arranged on a cooling circulation water pipeline of the sampling cooler, an outlet pipeline of the sampling cooler is connected with the sample gas separation tank, a silk screen demister is arranged in the sample gas separation tank, a liquid level meter is arranged on the outer wall of the sample gas separation tank, the online chromatographic analyzer is arranged on an air outlet pipeline of the sample gas separation tank, and a second pressure gauge is arranged between the sample gas separation tank and the online chromatographic analyzer, A second temperature meter and a second flow meter.
2. The system for detecting the content of all components in the process gas at the outlet of the methane synthesis reactor according to claim 1, wherein the gas outlet pipeline is connected with a manual closed sampler through a connecting pipe, and a valve is arranged at the inlet of the manual closed sampler.
3. The system for detecting the content of all components in the process gas at the outlet of the methane synthesis reactor according to claim 1 or 2, wherein a condensate flow meter and a liquid level regulating valve for regulating the liquid level of the sample gas separation tank are arranged on a condensate outlet pipeline of the sample gas separation tank.
4. The system for detecting the content of all components in the process gas at the outlet of the methane synthesis reactor, according to claim 3, wherein a sample gas flowmeter, a sample gas total flow regulating valve, a sample gas pressure gauge and a sample gas temperature gauge on the gas inlet pipeline of the sampling cooler are connected with the DCS control system.
5. The system of claim 4, wherein the cooling water flow control valve, the second pressure gauge, the second temperature gauge and the second flow gauge are all connected with the DCS control system, and the DCS control system is connected with the human-computer interaction interface and the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122943932.8U CN216669859U (en) | 2021-11-29 | 2021-11-29 | System for detecting all-component content in process gas at outlet of methane synthesis reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122943932.8U CN216669859U (en) | 2021-11-29 | 2021-11-29 | System for detecting all-component content in process gas at outlet of methane synthesis reactor |
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| CN216669859U true CN216669859U (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122943932.8U Active CN216669859U (en) | 2021-11-29 | 2021-11-29 | System for detecting all-component content in process gas at outlet of methane synthesis reactor |
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- 2021-11-29 CN CN202122943932.8U patent/CN216669859U/en active Active
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