CN115494893A - Temperature control device based on gas pressure regulating station and outlet temperature regulating method of gas pressure regulating station - Google Patents
Temperature control device based on gas pressure regulating station and outlet temperature regulating method of gas pressure regulating station Download PDFInfo
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Abstract
The invention discloses a temperature control device based on a gas pressure regulating station and a temperature regulating method for the outlet of the gas pressure regulating station, wherein the device comprises a primary pressure regulator and a secondary pressure regulator, the primary pressure regulator is connected with a high-pressure gas inlet pipeline, a first temperature detector, a first flow detector, a first heater and a first pressure detector are arranged on the high-pressure gas inlet pipeline, a gas output pipeline of the primary pressure regulator is divided into at least two branch pipes through a second pressure detector and the second temperature detector, the branch pipes are directly output to the outside of the pressure regulating station and/or are connected with a downstream pipeline after sequentially passing through the second flow detector, the second heater, the secondary pressure regulator, a third pressure detector and a third temperature detector, and all the temperature detectors, the flow detectors, the heaters and the pressure detectors are connected with a control system. The device of the invention automatically matches heat load, and avoids energy waste.
Description
Technical Field
The invention belongs to the field of natural gas temperature regulation, and particularly relates to a temperature control device based on a gas pressure regulating station and an outlet temperature regulating method of the gas pressure regulating station.
Background
Along with popularization of gas application and gradual deepening of national requirements on 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 a high pressure station or a secondary high pressure station enters, the gas pressure station is metered and regulated by the pressure regulating station and then is discharged at the secondary high pressure station or a medium pressure station to be supplied to a town gas pipe network, and in the actual operation process, the flow of the secondary high pressure station and the flow of the medium pressure 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 the secondary high pressure station is large, the flow of the medium pressure station is small, and after heat exchange is carried out through a heater, the temperature of the secondary high pressure station just reaches below a set value of 0 ℃, while the temperature of the medium pressure station already reaches more than 20 ℃, and obviously exceeds the range of the requirement of gas delivery, and a large amount of energy waste is caused. This is shown to be an unreasonable phenomenon in the context of the current energy saving carbon reduction.
In the operation process of a 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 absorption is needed, at the moment, if heat is not supplemented in time, gas cannot obtain enough heat from the environment to cause temperature reduction, 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.
Disclosure of Invention
The invention provides a temperature control device which is used for solving the problem that heating equipment is not matched with output flow due to unstable pressure and flow of each outlet of a gas pressure regulating station. The invention is based on the temperature control device of the gas pressure regulating station, automatically matches the heat load required by the outbound flow, automatically calculates the real-time heat demand, and adjusts the output heat load of the heat supply device in real time, so that the outbound temperature is controlled in a reasonable range, and the energy waste is avoided.
The invention relates to a temperature control device based on a gas pressure regulating station, which comprises a first-stage pressure regulator and a second-stage pressure regulator for regulating gas pressure, wherein a gas inlet of the first-stage pressure regulator is connected with a high-pressure gas inlet pipeline, the high-pressure gas inlet pipeline is sequentially provided with a first temperature detector, a first flow detector, a first heater and a first pressure detector along a gas conveying direction, and a gas output pipeline of the first-stage pressure regulator sequentially passes through a second pressure detector and a second temperature detector and then is connected with a gas outlet of the first-stage pressure regulator: (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 header for stabilizing air flow is arranged on the high-pressure air inlet pipeline between the first temperature detector and the first flow detector.
Furthermore, the gas output pipeline behind the second temperature detector is divided into a plurality of branch pipes after passing through the 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.
The method for adjusting the outlet temperature of the gas pressure regulating station by using the temperature control device comprises the following steps:
the high-pressure fuel gas passes through a first temperature detector (optionally enters a first header, and the gas output from the first header) and then enters a first heater to carry out first temperature rise, the heated fuel gas passes through the first pressure detector and then enters a first-stage pressure regulator to carry out first pressure reduction, one path of the gas after pressure reduction passes through a second pressure detector and a second temperature detector in sequence (optionally enters a second header, and the gas output from the second header) and is directly taken as secondary high-pressure fuel gas to be output to the outside of a pressure regulating station, or the other path of the gas after pressure reduction passes through the second flow detector and then enters a second heater to carry out second temperature rise, the heated fuel gas enters a second-stage pressure regulator to carry out second pressure reduction to obtain medium-pressure fuel gas, and the gas after second pressure reduction passes through a third pressure detector and a third temperature detector in sequence (optionally enters a third header, and the medium-pressure fuel gas of the third header) and is output to the outside 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, 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.
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-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
In order to ensure that the outlet temperature of the secondary pressure regulator reaches a certain temperature (for example, 4-8 ℃, further for example, 5 ℃), the temperature T1 ″ that the temperature of the gas in front of 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-two-stage regulator back pressure (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 invention has the beneficial effects that:
(1) The device can make the power of the first heater and the second heater dynamically change along with the size of the station entering flow, and adjust the heating power in real time, thereby making the control more refined.
(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.
In summary, the device of the present invention has the following advantages: 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 a schematic diagram of a temperature control device based on a gas pressure regulating station of the invention.
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, 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 invention is further illustrated in the following with reference to the accompanying drawings.
As shown in fig. 1, the temperature control device based on a gas pressure regulating station of the present invention includes a primary pressure regulator 1 and a secondary pressure regulator 2 for regulating gas pressure, a gas inlet of the primary pressure regulator 1 is connected to a high pressure gas inlet pipeline L1, the high pressure gas inlet pipeline L1 is sequentially provided with a first temperature detector 3, a first flow detector 4, a first heater 5, and a first pressure detector 6 along a gas conveying direction, a gas output pipeline of the primary pressure regulator 1 is sequentially divided into at least two branch pipes (for example, 2 to 6, preferably 2 to 4, and more preferably 2) after passing through a second pressure detector 7 and a second temperature detector 8, and the branch pipe L2: (1) The gas is transported to the outside of the pressure regulating station as a gas output pipeline (for example, an output pipeline of the secondary high-pressure gas), and/or (2) the gas sequentially passes through a second flow detector 9, a second heater 10, a secondary pressure regulator 2, a third pressure detector 11 and a third temperature detector 12 and then is connected with a downstream pipeline, and the first temperature detector 3, the first flow detector 4, the first heater 5 and 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 are all connected with a control system 13.
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.
The process of regulating the temperature of the fuel gas by using the temperature control device of the invention comprises the following steps:
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, a control system obtains the inlet gas temperature T1 through a first temperature detector 3, the pressure P1 before a first-stage pressure regulator is obtained through a first pressure detector 6, the temperature T2 after the first-stage pressure regulator is obtained through a second temperature detector 8, the pressure P2 after the first-stage pressure regulator is obtained through a second pressure detector 7, and the instantaneous flow F1 before the first-stage pressure regulator is obtained through a first flow detector 4, in order to ensure that the outlet temperature of the first-stage pressure regulator reaches the set temperature of about 5 ℃, the temperature T1' which the gas temperature should reach before the first-stage pressure regulator 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, 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 the formula 1, the temperature value which should be reached at least before the primary pressure regulator when the outlet temperature of the primary pressure regulator reaches 5 ℃ can be calculated, and then the theoretical electric heater functional rate P is calculated through the temperature difference of 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 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-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-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 alterations and modifications may be made by those having 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 (10)
1. The utility model provides a temperature control device based on gas pressure regulating station, its characterized in that, it is including one-level voltage regulator (1) and second grade voltage regulator (2) that are used for adjusting gas pressure, the gas inlet and 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 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 branch pipe (L2) to be connected with the low reaches pipeline as gas output pipeline behind second thermodetector (7) and second thermodetector (8) in proper order outside gaseous transportation to the pressure regulating station, and/or pass through second flow detector (9) in proper order, second heater (10), second grade voltage regulator (2), third thermodetector (11), be connected with the low reaches pipeline 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 (13), the equal thermodetector (13), the third thermodetector (13) is connected with the equal 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, 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 pressure regulating station based temperature control device according to claim 1, characterized in that a third header (16) is provided on the branch pipe after the third temperature detector.
7. The gas pressure regulating station based temperature control device according to claim 1, characterized in that the first heater (5) and the second heater (10) are gas electric heaters.
8. A gas pressure regulating station outbound temperature regulating method using the gas pressure regulating station based temperature control device of any one of claims 1 to 7, the method comprising the steps of:
the high-pressure fuel gas flows through a first temperature detector, optionally enters a first flow detector after passing through a first manifold, then enters a first heater for first temperature rise, the heated fuel gas enters a first-stage pressure regulator for first pressure reduction through the first pressure detector, the reduced-pressure gas optionally enters a second manifold after sequentially passing through a second pressure detector and a second temperature detector, and one path of gas output from the second manifold is directly output to the outside of a pressure regulating station as secondary high-pressure fuel gas;
(1) In the gas pressure regulating process, a control system obtains the incoming gas temperature T1 through a first temperature detector, obtains the front pressure P1 (generally 2.5-6.0 MPa) of a first-stage pressure regulator through the first pressure detector, obtains the rear temperature T2 of the first-stage pressure regulator through a second temperature detector, obtains the rear pressure P2 (generally 1.2-1.45 MPa) of the first-stage pressure regulator through the second pressure detector and obtains the front instantaneous flow F1 of the first-stage pressure regulator through a first flow detector, and in order to enable the outlet temperature of the first-stage pressure regulator to reach a certain temperature T2, such as 2-8 ℃, further 4-8 ℃, preferably about 5 ℃, the temperature T1' reached by the front gas temperature of the first-stage pressure regulator is as follows:
formula 1: t1' = T2- (mu j (P2-P1))
In the formula: t1' -primary regulator front temperature, DEG C;
muj-natural gas joule-thomson coefficient, deg.c/MPa;
p1-front pressure of a primary pressure regulator, MPa and absolute pressure;
p2-pressure behind the first-stage pressure regulator, MPa, absolute pressure;
t2-natural gas temperature after first-stage pressure regulator, DEG C;
calculating a temperature value which is at least required to be reached before the primary pressure regulator when the outlet temperature of the primary pressure regulator reaches T2, such as 2-8 ℃, further 4-8 ℃ and further such as 5 ℃ by calculating according to the formula 1, and then calculating the theoretical power P of the electric heater by using the temperature difference of the inlet and the outlet of the first heater:
formula 2: p = (F1 × ρ C × (T1' -T1))/(k × 3600)
In the formula: t1' -primary regulator front temperature, DEG C;
f1-instantaneous flow before first-stage voltage regulator, nm 3 /h；
Rho-natural gas standard density, the value is 0.75Kg/Nm 3 ；
C is the specific heat capacity of natural gas, and the value is 2.156 KJ/(Kg. K);
t1-natural gas in-station temperature, DEG C;
k is the electric heater electrothermal conversion and heat exchange coefficient, and the value is 0.85-0.95;
calculating by formula 2 to obtain the power of the first heater required when the outlet temperature T2 of the primary pressure regulator reaches a set value, and then adjusting the power of the first heater to the power by the output of the control system.
9. The gas regulator station outbound temperature adjustment method according to claim 8,
the other path of gas output from the second temperature detector or the second manifold passes through the second flow detector and then enters the second heater for second temperature rise, the gas after temperature rise enters the secondary pressure regulator for second pressure reduction to obtain medium-pressure gas, the gas after second pressure reduction optionally enters the third manifold after sequentially passing through the third pressure detector and the third temperature detector, and the medium-pressure gas of the third manifold is output to the outside of the pressure regulating station;
(2) 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 enable the outlet temperature of the secondary pressure regulator to reach a certain temperature T3 (for example, 4-8 ℃, further for example, 5 ℃), the temperature T1' reached by the gas temperature before the secondary pressure regulator is as follows:
formula 3: t1"= T3- (mu j (P3-P2))
In the formula: t1 "-temperature before secondary regulator, DEG C;
muj-natural gas joule-thomson coefficient, deg.c/MPa;
p2-front pressure of the secondary pressure regulator, MPa and absolute pressure;
p3-pressure behind the secondary pressure regulator, MPa, absolute pressure;
t3-natural gas temperature after secondary pressure regulator, DEG C;
calculating a temperature value which is at least required to be reached before the secondary pressure regulator when the outlet temperature of the secondary pressure regulator is ensured to reach T3, such as 4-8 ℃, further such as 5 ℃ by calculating according to the formula 3, and then calculating the theoretical function rate P' of the second heater by using 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 "-temperature before secondary regulator, DEG C;
f2-instantaneous flow before two-stage pressure regulator, nm 3 /h；
Rho is the standard density of natural gas, and the value is 0.75Kg/Nm 3 ；
C is the specific heat capacity of natural gas, and the value is 2.156 KJ/(Kg. K);
t2-natural gas temperature after first-stage pressure regulator, DEG C;
k is the electrothermal conversion and heat exchange coefficient of the electric heater, and the value is 0.85 to 0.95;
and calculating by the formula 4 to obtain the power of the second heater required when the outlet temperature of the secondary pressure regulator reaches a set value T3, and then regulating the power of the second heater to the heating power by the output of the control system.
10. The gas pressure regulating station outbound temperature regulating method according to claim 8 or 9, characterized in that when power control fails, the outlet temperature of the pressure regulator is lower than a set value, a temperature control override mode is entered, the control system performs override control by using the post-primary pressure regulator temperature T2 or the post-secondary pressure regulator temperature T3, and when the post-pressure regulation temperature fixed value (for example, 0 ℃) cannot be met through calculation output of formula 2 or formula 4, the control mode of the control system is forcibly switched to the temperature regulation mode, that is, the control system outputs a signal to forcibly increase the heat supply power, so as to increase the post-pressure regulator temperature T2 or T3.
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