CN218383756U - Temperature control device based on gas pressure regulating station - Google Patents
Temperature control device based on gas pressure regulating station Download PDFInfo
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- CN218383756U CN218383756U CN202222603509.8U CN202222603509U CN218383756U CN 218383756 U CN218383756 U CN 218383756U CN 202222603509 U CN202222603509 U CN 202222603509U CN 218383756 U CN218383756 U CN 218383756U
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Abstract
The utility model discloses a temperature control device based on gas pressure regulating station, including one-level voltage regulator and second grade voltage regulator, one-level voltage regulator is connected with the high pressure admission line, be equipped with first thermodetector on the high pressure admission line, first flow detector, first heater, first pressure detector, the gas output pipeline of one-level voltage regulator divide into two at least branch pipes behind second pressure detector and second thermodetector, the branch pipe direct output is outside to the pressure regulating station, and/or pass through the second flow detector in proper order, the second heater, the second grade voltage regulator, third pressure detector, behind the third thermodetector with low reaches pipe connection, all thermodetectors, flow detector, the heater, pressure detector all is connected with control system. The utility model discloses a device, automatic matching heat load avoids the energy extravagant.
Description
Technical Field
The utility model belongs to natural gas field of adjusting temperature, concretely relates to temperature control device based on gas pressure regulating station.
Background
Along with popularization of gas application and gradual deepening of national requirements for gas-substituted coal, more and more towns need to be added with gas pressure regulating stations, wherein the most typical pressure regulating station is that high pressure or secondary high pressure enters a station, the gas is metered and regulated by the pressure regulating station and then is discharged from the station at secondary high pressure or medium pressure to be supplied to a town gas pipe network, in the actual operation process, the flow of secondary high pressure discharged from the station and the flow of medium pressure discharged from the station are not in a fixed proportion, so that the pressure regulating station cannot accurately control when providing heat load, and heat waste is caused, for example, in some stations, the flow of secondary high pressure discharged from the station is large, the flow of medium pressure discharged from the station is small, after heat exchange is carried out through a heater, the temperature of the secondary high pressure discharged from the station just reaches below a set value of 0 ℃, and the temperature of the medium pressure discharged from the station reaches above 20 ℃, so that the temperature of the medium pressure discharged from the station obviously exceeds the factory requirement range of gas, and a large amount of energy is wasted. This is shown to be an unreasonable phenomenon in the context of the current energy saving carbon reduction.
In the operation process of the gas pressure regulating station, the outbound pressure and the flow of each branch often dynamically change along with time, and in the process of gas pressure regulation, because the gas pressure is reduced, heat needs to be absorbed, if heat is not supplemented in time, gas can not obtain enough heat from the environment and temperature is reduced, when the temperature is lower than a set value, the influence on downstream equipment is possibly caused, and the traditional process scheme adopts a quantitative heating mode, the real-time condition of gas cannot be well matched, the outbound temperature is uneven, even in order to ensure the output temperature of a certain branch, the temperature of other branches can exceed the upper limit, and energy waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a temperature control device is used for solving gas pressure regulating station because of each way pressure, the flow is unstable of leaving a station, leads to the unmatched problem of firing equipment and output flow, through the whole combination of on-the-spot check out test set and heating equipment, realizes the accurate control of gas leaving a station temperature, avoids leaving a station the high temperature or cross lowly, also reduces the energy waste simultaneously. The utility model discloses a temperature control device based on gas pressure regulating station matches the required heat load of flow that comes out automatically, through the real-time heat demand of automatic calculation to adjust heating device's output heat load in real time, make the temperature control that comes out at reasonable within range, be unlikely to the waste that causes the energy again.
The utility model discloses a temperature control device based on gas pressure regulating station, it is including the one-level voltage regulator and the second grade voltage regulator that are used for adjusting gas pressure, the gas inlet and the high-pressure admission line of one-level voltage regulator are connected, and high-pressure admission line is equipped with first thermodetector, first flow detector, first heater, first thermodetector along gas transportation direction in proper order, and the gas output pipeline of one-level voltage regulator is behind second thermodetector and second thermodetector in proper order: (1) The branch pipe is used as a gas output pipeline (such as an output pipeline of secondary high-pressure gas) to convey gas to the outside of the pressure regulating station, and/or (2) the branch pipe is connected with a downstream pipeline after sequentially passing through a second flow detector, a second heater, a two-stage pressure regulator, a third pressure detector and a third temperature detector, and the first temperature detector, the first flow detector, the first heater, the first pressure detector, the second temperature detector, the second flow detector, the second heater, the third pressure detector and the third temperature detector are all connected with a control system.
Furthermore, the control system is an automatic control system, and the control system collects temperature, pressure and flow signals of the first temperature detector, the first flow detector, the first pressure detector, the second temperature detector, the second flow detector, the third pressure detector and the third temperature detector and is used for controlling the heating power of the first heater and the second heater, so that the outlet temperature of the fuel gas is adjusted to a reasonable range in real time.
Furthermore, a first collecting pipe for stabilizing air flow is arranged on the high-pressure air inlet pipeline between the first temperature detector and the first flow detector.
Furthermore, a gas output pipeline behind the second temperature detector is divided into a plurality of branch pipes after passing through a second collecting pipe.
Furthermore, a third collecting pipe is arranged on the branch pipe behind the third temperature detector.
Further, the first heater and the second heater are gas electric heaters.
Use the utility model discloses a method that temperature control device adjusted the gas pressure regulating station temperature of leaving a station includes:
the high-pressure fuel gas passes through a first temperature detector (optionally enters a first manifold, the gas output from the first manifold) and then enters a first heater for first temperature rise, the heated fuel gas passes through the first pressure detector and then enters a first-stage pressure regulator for first pressure reduction, the reduced-pressure gas passes through a second pressure detector and a second temperature detector (optionally enters a second manifold, the gas output from the second manifold) in sequence, one path of the reduced-pressure gas is directly used as secondary high-pressure fuel gas and is output to the outside of a pressure regulating station, or the other path of the reduced-pressure gas passes through the second flow detector and then enters a second heater for second temperature rise, the heated fuel gas enters a second-stage pressure regulator for second pressure reduction to obtain medium-pressure fuel gas, and the second reduced-pressure gas passes through a third pressure detector and a third temperature detector in sequence (optionally enters a third manifold, the medium-pressure fuel gas of the third manifold) and is output to the outside of the pressure regulating station.
1. One-stage pressure regulating temperature control function
In the gas pressure regulating process, the control system obtains the incoming gas temperature T1 through the first temperature detector, obtains the first-stage pressure regulator front pressure P1 (generally 2.5-6.0 MPa) through the first pressure detector, obtains the first-stage pressure regulator rear temperature T2 through the second temperature detector, obtains the first-stage pressure regulator rear pressure P2 (generally 1.2-1.45 MPa) through the second pressure detector, and obtains the first-stage pressure regulator front instantaneous flow F1 through the first flow detector, in order to ensure that the first-stage pressure regulator outlet temperature reaches a certain temperature T2, such as 2-8 ℃, further 4-8 ℃, and preferably about 5 ℃, then the temperature T1' which the first-stage pressure regulator front gas temperature should reach should be:
formula 1: t1' = T2- (mu j (P2-P1))
In the formula: t1' -temperature before primary pressure regulator
μ j-natural gas Joule-Thomson coefficient (. Degree. C./MPa, which can be found in the literature)
P1-front pressure of first-level voltage regulator (MPa, absolute pressure)
P2-rear pressure of first-level voltage regulator (MPa, absolute pressure)
T2-natural gas temperature (deg.C) after first stage pressure regulator.
By calculating the formula 1, it can be calculated that when the outlet temperature of the primary pressure regulator is ensured to reach T2, for example, 2-8 ℃, further 4-8 ℃, further for example, 5 ℃, the temperature value which should be reached before the primary pressure regulator is at least reached, and then the theoretical power P of the electric heater is calculated by the temperature difference between the inlet and the outlet of the first heater:
formula 2: p = (F1 ρ × C × (T1' -T1))/(k × 3600)
In the formula: t1' -temperature before primary pressure regulator
F1-instantaneous flow before first-stage voltage regulator (Nm) 3 /h)
Rho-natural gas standard density (value is 0.75 Kg/Nm) 3 )
C-natural gas specific heat capacity (value of 2.156 KJ/(Kg. K))
T1-natural gas in-station temperature (DEG C.)
k is the electrothermal conversion and heat exchange coefficient of the electric heater (value is 0.85-0.95).
Through the calculation of formula 2, it can be obtained that when the outlet temperature of the primary pressure regulator reaches the set value, the power of the first heater is needed, and then the power of the first heater is adjusted to a proper position through the output of the control system, the control process is dynamic, and the power of the first heater is adjusted at any time along with the adjustment of the incoming flow, so that the temperature of the fuel gas after primary pressure regulation can be ensured to be still kept near the set value after the incoming flow changes, and the phenomenon of over-temperature or low temperature is avoided.
2. Two-stage pressure regulating temperature control function
The control system obtains a rear pressure P3 (generally 0.2-0.35 MPa) of the secondary pressure regulator through the third pressure detector, obtains a rear temperature T3 of the secondary pressure regulator through the third temperature detector, and obtains an instantaneous flow F2 before the secondary pressure regulator through the second flow detector, and in order to ensure that the outlet temperature of the secondary pressure regulator reaches a certain temperature (e.g. 4-8 ℃, further e.g. 5 ℃), the temperature T1 "which the gas temperature before the secondary pressure regulator should reach should be:
formula 3: t1"= T3- (mu j (P3-P2))
In the formula: t1-front temperature of secondary pressure regulator C
μ j-natural gas Joule-Thomson coefficient (. Degree. C./MPa, values which can be found in the relevant literature)
P2-front pressure of two-stage pressure regulator (MPa, absolute pressure)
P3-rear pressure of two-stage regulator (MPa, absolute pressure)
T3-Natural gas temperature (deg.C) after secondary regulator.
By calculating the equation 3, it can calculate the temperature value that should be reached before the secondary pressure regulator when the outlet temperature of the secondary pressure regulator is ensured to reach, for example, 4-8 ℃, and further, for example, 5 ℃, and then calculate the theoretical second heater functional rate P' by the temperature difference between the inlet and the outlet of the second heater:
formula 4: p' = (F2 ρ C (T1 ″ -T2))/(k 3600)
In the formula: t1-front temperature of secondary pressure regulator C
F2-instantaneous flow before two-stage Voltage regulator (Nm) 3 /h)
Rho-natural gas standard density (value is 0.75 Kg/Nm) 3 )
C-natural gas specific heat capacity (value of 2.156 KJ/(Kg. K))
T2-natural gas temperature (deg.C) after first-stage pressure regulator
k is the electrothermal conversion and heat exchange coefficient of the electric heater (value is 0.85-0.95).
Through the calculation of the formula 4, the power of the second heater is required to ensure that the outlet temperature of the secondary pressure regulator reaches the set value, and then the power of the second heater is adjusted to a proper position through the output of the control system.
In the actual operation process, if the power control fails and the outlet temperature of the voltage regulator is lower than a set value, the temperature control override mode is entered, the control system can utilize the post-temperature T2 of the first-stage voltage regulator or the post-temperature T3 of the second-stage voltage regulator to carry out override control, when the post-voltage-regulation temperature fixed value (for example, 0 ℃) cannot be met through calculation output of the formula 2 or the formula 4, the control mode of the control system is forcibly switched to the temperature regulation mode (the switching of the control mode is realized through the switching of a control algorithm in the control system), namely, the control system outputs a signal to forcibly improve the heat supply power so as to improve the post-voltage-regulator temperature T2 or T3, the phenomenon that the outlet temperature is low or high due to the power control failure is avoided, and the availability of the control system is improved. Meanwhile, when the temperature T2 or T3 after the voltage regulator is recovered to a normal set value (for example, 10 ℃), the control system can automatically switch the control mode and return to the power control mode again to improve the control accuracy.
In this application, "optionally" means with or without, or with or without, the processing step immediately following the term.
Through the effective control of the front and back temperature of the first-stage pressure regulator and the second-stage pressure regulator, the problem of uneven outlet temperature of the gas pressure regulating station is solved, and meanwhile, the waste of energy is greatly reduced.
The utility model has the advantages that:
(1) The utility model discloses a device can be so that the power of first heater and second heater is along with the big or small dynamic change of flow of entering a station, adjusts heating power in real time to it is more meticulous to make control.
(2) Through the effective control to one-level voltage regulator and second grade voltage regulator inlet temperature, avoided one-level voltage regulator and second grade voltage regulator outlet temperature to hang down the phenomenon excessively, the effectual pressure regulating equipment of avoiding takes place the possibility that the ice is stifled, is showing the security that has improved pressure regulating equipment.
(3) This device can effectually avoid first heater and second heater dry combustion method phenomenon, and effectual reduction power consumption reduces the carbon consumption under the same operating mode.
To sum up, adopt this the utility model discloses an advantage of device is: the control is more refined, the energy is saved, the consumption is reduced, and the control process is safe and stable.
Drawings
Fig. 1 is the utility model discloses a temperature control device's schematic diagram based on gas pressure regulating station.
Description of reference numerals:
1-a first-stage pressure regulator, 2-a second-stage pressure regulator, 3-a first temperature detector, 4-a first flow detector, 5-a first heater, 6-a first pressure detector, 7-a second pressure detector, 8-a second temperature detector, 9-a second flow detector, 10-a second heater 10, 11-a third pressure detector, 12-a third temperature detector, 13-a control system 13, 14-a first manifold, 15-a second manifold, 16-a third manifold;
l1-high pressure air inlet pipeline and L2-branch pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses a temperature control device based on gas pressure regulating station, it includes one-level voltage regulator 1 and second level voltage regulator 2 that are used for adjusting gas pressure, the gas inlet and the high-pressure admission line L1 of one-level voltage regulator 1 are connected, high-pressure admission line L1 is equipped with first thermodetector 3 along the gas transportation direction in proper order, first flow detector 4, first heater 5, first thermodetector 6, the gas output pipeline of one-level voltage regulator 1 divides into two at least branch pipes (for example 2-6, preferably 2-4, more preferably 2) behind second thermodetector 7 and the second thermodetector 8 in proper order, branch pipe L2 is as gas output pipeline (for example the output pipeline of inferior high-pressure gas) with gas transportation outside the pressure regulating station, and/or pass second flow detector 9 in proper order, second heater 10, second level voltage detector 2, third thermodetector 11, be connected with downstream pipe behind the third thermodetector 12, first thermodetector 3, first flow detector 4, first heater 5, first thermodetector 6, second thermodetector 7, second thermodetector 8, second thermodetector 9, third thermodetector 12, third thermodetector 13 is connected with the equal control system.
The control system 13 is an automatic control system, and the control system 13 collects temperature, pressure and flow signals of the first temperature detector 3, the first flow detector 4, the first pressure detector 6, the second pressure detector 7, the second temperature detector 8, the second flow detector 9, the third pressure detector 11 and the third temperature detector 12 and is used for controlling the heating power of the first heater 5 and the second heater 10, so that the outlet temperature of the fuel gas is adjusted to a reasonable range in real time.
The control system 13 is connected to the first temperature detector 3, the first flow rate detector 4, the first heater 5, the first pressure detector 6, the second pressure detector 7, the second temperature detector 8, the second flow rate detector 9, the second heater 10, the third pressure detector 11, and the third temperature detector 12 by wireless or via electric wires.
A first header 14 for smoothing the air flow may be provided on the high pressure intake duct between the first temperature detector 3 and the first flow rate detector 4.
The gas output pipeline behind the second temperature detector is divided into a plurality of branch pipes through a second collecting pipe 15, for example, the branch pipe is used as a gas output pipeline (for example, a secondary high-pressure gas output pipeline) for conveying gas to the outside of the pressure regulating station, and the branch pipe is used as a branch pipe which is connected with a downstream pipeline after sequentially passing through a second flow detector 9, a second heater 10, a second-stage pressure regulator 2, a third pressure detector 11 and a third temperature detector 12.
A third header 16 is provided on the branch pipe after the third temperature detector.
The first heater 5 and the second heater 10 are gas electric heaters.
Use the utility model discloses a process that temperature control device adjusted gas temperature includes:
high-pressure gas enters a first manifold 14 after passing through a first temperature detector 3, gas output from the first manifold 14 enters a first heater 5 for first temperature rise after passing through a first flow detector 4, gas after temperature rise enters a first-stage pressure regulator 1 for first pressure reduction through a first pressure detector 6, gas after pressure reduction enters a second manifold 15 after sequentially passing through a second pressure detector 7 and a second temperature detector 8, gas output from the second manifold 15 is divided into at least two paths, one path of gas is directly output to the outside of a pressure regulating station as secondary high-pressure gas, or one path of gas enters a second heater 10 for second temperature rise after passing through a second flow detector 9, the gas after temperature rise enters a second-stage pressure regulator 2 for second pressure reduction to obtain medium-pressure gas, the gas after second pressure reduction sequentially passes through a third pressure detector 11 and a third temperature detector 12 and then enters a third manifold 16, and the medium-pressure gas of the third manifold 16 is output to the outside of the pressure regulating station.
1. One-stage pressure regulating temperature control function
In the gas pressure regulating process, the control system obtains the inlet gas temperature T1 through the first temperature detector 3, the pressure P1 before the first-stage pressure regulator is obtained through the first pressure detector 6, the temperature T2 after the first-stage pressure regulator is obtained through the second temperature detector 8, the pressure P2 after the first-stage pressure regulator is obtained through the second pressure detector 7 and the instantaneous flow F1 before the first-stage pressure regulator is obtained through the first flow detector 4, when the outlet temperature of the first-stage pressure regulator reaches the set temperature of about 5 ℃, then the temperature T1' that the gas temperature should reach before the first-stage pressure regulator should be:
formula 1: t1' = T2- (μ j (P2-P1))
In the formula: t1' -temperature before primary pressure regulator
μ j-natural gas Joule-Thomson coefficient (. Degree. C./MPa, values which can be found in the relevant literature)
P1-front pressure of first-level voltage regulator (MPa, absolute pressure)
P2-rear pressure of first-level voltage regulator (MPa, absolute pressure)
T2-natural gas temperature (deg.C) after first-stage pressure regulator.
Through the calculation of formula 1, can calculate the temperature value that should reach before the first-level voltage regulator when guaranteeing that first-level voltage regulator outlet temperature reaches 5 ℃, then rethread first heater exit temperature difference, calculate theoretical electric heater functional rate P: formula 2: p = (F1 × ρ C × (T1' -T1))/(k × 3600)
In the formula: t1' -temperature before primary pressure regulator
F1-first order Voltage RegulationInstantaneous flow before device (Nm) 3 /h)
Rho-natural gas standard density (value is 0.75 Kg/Nm) 3 )
C-specific heat capacity of natural gas (value 2.156 KJ/(Kg. X K))
T1-natural gas in-station temperature (DEG C.)
k is the electrothermal conversion and heat exchange coefficient of the electric heater (value is 0.85-0.95).
Through the calculation of formula 2, can derive, when wanting to guarantee that one-level voltage regulator outlet temperature reaches the setting value, the power of required first heater, then through control system's output, with the power adjustment of first heater to suitable position, this control process is dynamic, along with the adjustment of the flow of entering the station, adjusts the power of first heater at any time, ensures that the gas temperature after the one-level pressure regulating still can keep near the setting value after the flow changes of entering the station, avoids appearing super temperature or microthermal phenomenon.
2. Two-stage pressure regulating temperature control function
The control system obtains pressure P3 behind the second-stage pressure regulator through third pressure detector 11, obtains temperature T3 behind the second-stage pressure regulator through third temperature detector 12, and obtains the preceding instantaneous flow F2 of second-stage pressure regulator through second flow detector 9, when in order to guarantee that second-stage pressure regulator outlet temperature reaches certain temperature 5 ℃, then temperature T1 "that the preceding gas temperature of second-stage pressure regulator should reach should be:
formula 3: t1"= T3- (mu j (P3-P2))
In the formula: t1 "-temperature before secondary pressure regulator
μ j-natural gas Joule-Thomson coefficient (. Degree. C./MPa, which can be found in the literature)
P2-front pressure of two-stage pressure regulator (MPa, absolute pressure)
P3-two-stage regulator back pressure (MPa, absolute pressure)
T3-Natural gas temperature (deg.C) after secondary regulator.
By calculating the formula 3, the temperature value which should be reached before the secondary pressure regulator when the outlet temperature of the secondary pressure regulator is ensured to reach 5 ℃ can be calculated, and then the theoretical second heater functional rate P' can be calculated by the temperature difference of the inlet and the outlet of the second heater: formula 4: p' = (F2 ρ C (T1 ″ -T2))/(k 3600)
In the formula: t1-calculating temperature before secondary pressure regulator
F2-instantaneous flow before two-stage Voltage regulator (Nm) 3 /h)
Rho-natural gas standard density (value is 0.75 Kg/Nm) 3 )
C-natural gas specific heat capacity (value of 2.156 KJ/(Kg. K))
T2-temperature of natural gas after first-level pressure regulator (DEG C)
k is the electrothermal conversion and heat exchange coefficient of the electric heater (value is 0.85-0.95).
Through the calculation of the formula 4, the power of the second heater is required to ensure that the outlet temperature of the secondary pressure regulator reaches the set value, and then the power of the second heater is adjusted to a proper position through the output of the control system.
The foregoing describes preferred embodiments of the present invention, however, the foregoing description is not intended to be limiting. Many changes and modifications may be made by one of ordinary skill in the art without departing from the spirit and scope of the invention. Such changes or modifications are intended to be included within the scope of the appended claims.
Claims (8)
1. The utility model provides a temperature control device based on gas pressure regulating station, its characterized in that, it includes one-level voltage regulator (1) and second level voltage regulator (2) that are used for adjusting gas pressure, the gas inlet and the high pressure admission line (L1) of one-level voltage regulator (1) are connected, high pressure admission line (L1) are equipped with first thermodetector (3) along the gas transmission direction in proper order, first flow detector (4), first heater (5), first thermodetector (6), the gas output pipeline of one-level voltage regulator 1 divides branch pipe (L2) to be connected with downstream pipe as gas output pipeline behind second thermodetector (7) and second thermodetector (8) in proper order outside the pressure regulating station, and/or pass through second flow detector (9) in proper order, second heater (10), second level voltage regulator (2), third thermodetector (11), be connected with downstream pipe behind third thermodetector (12), first thermodetector (3), first flow detector (4), first heater (5), first thermodetector (6), second thermodetector (7), second thermodetector (8), second thermodetector (9), second thermodetector (12), third thermodetector (13), the equal pressure detector (13), the equal pressure control system.
2. The temperature control device based on the gas pressure regulating station as claimed in claim 1, wherein the control system (13) is an automatic control system, and the control system (13) acquires temperature, pressure and flow signals of the first temperature detector (3), the first flow detector (4), the first pressure detector (6), the second pressure detector (7), the second temperature detector (8), the second flow detector (9), the third pressure detector (11) and the third temperature detector (12) and is used for controlling heating power of the first heater (5) and the second heater (10) so as to regulate the outlet temperature of the gas in real time.
3. The gas pressure regulating station based temperature control device according to claim 1 or 2, characterized in that the control system (13) is connected with the first temperature detector (3), the first flow detector (4), the first heater (5), the first pressure detector (6), the second pressure detector (7), the second temperature detector (8), the second flow detector (9), the second heater (10), the third pressure detector (11) and the third temperature detector (12) in a wireless or electric wire mode.
4. The gas pressure regulating station based temperature control device according to claim 1, characterized in that a first header (14) for smoothing air flow is arranged on the high pressure air inlet pipe between the first temperature detector (3) and the first flow detector (4).
5. The gas pressure regulating station based temperature control device according to claim 1 or 4, characterized in that the gas output pipeline after the second temperature detector is divided into a plurality of branch pipes after passing through a second header (15).
6. The gas burning pressure regulating station based temperature control device according to claim 1 or 4, wherein a third header (16) is provided on a branch pipe after the third temperature detector.
7. The gas pressure regulating station based temperature control device according to claim 6, characterized in that a third header (16) is provided on the branch pipe after the third temperature detector.
8. The gas pressure regulating station based temperature control device according to claim 1 or 2, characterized in that the first heater (5) and the second heater (10) are gas electric heaters.
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