CN111692449A - Two-stage vortex series connection strengthening heating system and method of high-pressure low-temperature pilot-operated pressure regulating system - Google Patents
Two-stage vortex series connection strengthening heating system and method of high-pressure low-temperature pilot-operated pressure regulating system Download PDFInfo
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Abstract
The invention discloses a two-stage vortex series connection strengthening heating system and a method of a high-pressure low-temperature pilot-operated pressure regulating system, wherein a pressure gauge, an emergency cut-off valve and a pilot-operated monitoring valve before pressure regulation at the upstream of a gas pipeline are sequentially connected in series along the gas flowing direction in a long natural gas pipeline; the outlet pipeline between the emergency block valve and the pilot-operated monitoring valve is connected with the inlet of the vortex thermal mass separator; the cold air outlet pipeline of the vortex thermal mass separator is connected with the downstream of the gas transmission pipeline, and the hot air outlet pipeline is connected with the vortex heater; the outlet pipeline of the vortex heater is connected with the downstream of the gas transmission pipeline, the pressure guide pipeline before the pilot gas heating is connected with the heat exchange channel of the vortex heater through the gas transmission pipeline between the emergency block valve and the pilot type monitoring valve, and the pressure guide pipeline after the pilot gas heating is respectively connected with the pilot type monitoring valve director and the pilot type pressure regulating valve director. Two stages of vortex tubes are connected in series to intensively heat pilot gas of a pressure leading tube in a pilot-operated pressure regulating system, so that an operator or the pressure leading tube behind the operator is prevented from being blocked by ice to lose efficacy, and the pilot-operated pressure regulating system has good common adaptability to different working conditions and environmental conditions.
Description
Technical Field
The invention relates to a split-transmission pressure regulating technology of a natural gas long-distance pipeline, in particular to a two-stage vortex series-connection strengthening heating system and a method of a high-pressure low-temperature pilot-operated pressure regulating system.
Background
With the establishment of oil and gas pipe network companies, the natural gas industry is in a new and vigorous development situation, and the sub-transmission pressure regulating system plays a very key role in the construction and operation of national natural gas basic networks with interconnected trunks and regional nets.
At present, in order to prevent the pressure regulating device of the natural gas long-distance pipeline distribution system from being blocked by ice, the pilot gas of the pressure guiding pipe is heated by external heat source methods such as a water jacket furnace and electric tracing, and the like, so that the defects of high energy consumption, short service life, frequent maintenance, great potential safety hazard and the like exist. Aiming at the demand and the characteristics of online heating of pilot gas of a pressure regulating device, patents (CN103383045A and CN103383046A) provide a heating system and a method of a pilot type pressure regulating valve based on the energy separation principle of a vortex tube, namely, a certain amount of natural gas passes through a vortex tube heater at a high speed under the action of pressure difference, the pressure energy of the gas is converted and separated into heat energy and cold energy, and the heat energy is utilized to heat the pilot gas, so that the pilot type pressure regulating valve director is prevented from generating ice blockage. The method has the advantages of no moving parts, no maintenance, no need of external energy, safety, reliability and the like, but whether the method can realize the function depends on the heating capacity of the vortex tube heater essentially.
However, the long natural gas pipeline mostly adopts high-pressure transportation of 8-10 MPa to improve the transportation efficiency, the pressure is reduced to 1-2 MPa in the distribution station for safety, the large pressure drop means a large joule thomson cooling temperature drop, and the distribution station faces a low-temperature environment below-10 ℃ in winter, such as the north segment of the natural gas pipeline in the east of china and russia, which poses a great challenge to the heating performance of the vortex tube. The low energy conversion efficiency and the weak adaptability to the working condition change become common problems faced by single-stage vortex tubes. Test results of a double-channel vortex tube heater show that when the initial temperature is reduced by 16.4 ℃, the heating capacity of the vortex tube on pilot gas is reduced by 10.2-10.9 ℃; under the condition of keeping the pressure ratio of the inlet to the outlet of the vortex tube to be 1.4, when the pressure difference of the inlet and the outlet is increased from 0.4MPa to 1.6MPa, the heating capacity of the vortex tube to the prior gas guiding is reduced by 8.4-10.2 ℃.
Therefore, under the conditions of high pressure and low temperature, the heating capacity of the methods proposed by patents such as CN103383045A and CN103383046A may not meet the safety requirements of actual engineering, and the large-scale popularization and application of the vortex tube heating technology in the natural gas long-distance pipeline pressure regulating system is severely restricted.
Disclosure of Invention
The invention aims to provide a two-stage eddy series connection strengthening heating system and a method of a high-pressure low-temperature pilot-operated pressure regulating system.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a two-stage vortex series intensified heating system of a high-pressure low-temperature pilot-operated pressure regulating system, which is characterized in that a pressure gauge before pressure regulation at the upstream of a gas transmission pipeline, an emergency cut-off valve, a pilot-operated monitoring valve, a pressure gauge between the pilot-operated monitoring valve and a pilot-operated pressure regulating valve, the pilot-operated pressure regulating valve and a pressure gauge after pressure regulation at the downstream of the gas transmission pipeline are sequentially connected in series in the gas flowing direction of a natural gas long-distance transmission pipeline;
an inlet pipeline of the vortex thermal mass separator is led out between the emergency block valve and the pilot type monitoring valve and is connected with an inlet of the vortex thermal mass separator through a control ball valve;
a cold air outlet pipeline of the vortex thermal mass separator is connected with the downstream of the gas transmission pipeline through a ball valve; the hot gas outlet pipeline is connected with the vortex heater through a hot gas outlet thermometer of the vortex thermal mass separator and a control ball valve;
the outlet pipeline of the vortex heater is connected with the downstream of the gas pipeline through a control ball valve; a pressure guiding pipeline of the vortex heater before pilot gas heating is connected out by a gas transmission pipeline between the emergency cut-off valve and the pilot type monitoring valve and is connected into a heat exchange channel of the vortex heater through a thermometer and a control ball valve before pilot gas heating; the pressure guide pipeline of the vortex heater heated by the pilot gas is divided into two paths after passing through the thermometer heated by the pilot gas: one pressure guiding branch of the pilot monitoring valve director is connected with the pilot monitoring valve director through a control ball valve; the other route is connected with the pilot type pressure regulating valve director through a control ball valve by a pressure leading branch of the pilot type pressure regulating valve director;
the outlets of the pilot monitoring valve director and the pilot pressure regulating valve director are respectively connected with the downstream of the gas transmission pipeline through a common outlet pipeline after passing through a thermometer.
The method for realizing the two-stage vortex series connection strengthening heating of the two-stage vortex series connection strengthening heating system of the high-pressure low-temperature pilot-operated pressure regulating system comprises the following steps:
leading out natural gas from the long-distance natural gas pipeline, and providing a high-pressure vortex gas source for the vortex thermal mass separator after the natural gas is regulated by the control ball valve;
after the high-pressure natural gas is subjected to thermal mass separation in the vortex thermal mass separator, the cold gas part returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline after being regulated by a control ball valve of the cold gas outlet pipeline of the vortex thermal mass separator through the cold gas outlet pipeline of the vortex thermal mass separator; the hot gas part is displayed by a hot gas outlet pipeline of the vortex thermal mass separator through a hot gas outlet thermometer of the vortex thermal mass separator to have a preheating effect, and a vortex gas source is provided for the vortex heater at a pressure required by the optimal heating performance of the vortex heater after the control ball valve of the hot gas outlet pipeline of the vortex thermal mass separator is adjusted;
after further energy separation in the vortex heater, the hot gas returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline through an outlet pipeline of the vortex heater and a control ball valve of the outlet pipeline of the vortex heater; the pilot gas is transmitted from a gas transmission pipeline between the emergency cut-off valve and the pilot type monitoring valve, a pressure guide pipeline before the pilot gas is heated displays the initial temperature through a thermometer before the pilot gas is heated, and the pilot gas enters a heat exchange channel of the vortex heater for heating after being regulated by a control ball valve of the pressure guide pipeline before the pilot gas is heated; the heated pilot gas is heated by the pilot gas, and then the heated pilot gas is displayed by a thermometer heated by the pilot gas and then enters the director in two paths, one path of the heated pilot gas is heated by the pilot gas and then is connected with a pressure-guiding branch of the pilot type monitoring valve director, and the heated pilot gas enters the pilot type monitoring valve director after being regulated by a control ball valve of the branch; the other route is connected with a pressure guiding branch of the pilot type pressure regulating valve director after being guided and heated, and enters the pilot type pressure regulating valve director after being regulated by a control ball valve of the branch; after the pilot-operated monitoring valve director and the pilot-operated pressure regulating valve director complete the work, the pilot-operated gas respectively displays the cooling temperature through an outlet thermometer of the pilot-operated monitoring valve director and an outlet thermometer of the pilot-operated pressure regulating valve director, and the pilot-operated monitoring valve director and the pilot-operated pressure regulating valve director share an outlet pipeline, and returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline.
According to the technical scheme provided by the invention, the two-stage vortex series-connection strengthening heating system and the two-stage vortex series-connection strengthening heating method of the high-pressure low-temperature pilot-operated pressure regulating system provided by the embodiment of the invention have the advantages that the two-stage vortex series-connection strengthening heating system and the two-stage vortex series-connection strengthening heating method of the high-pressure low-temperature pilot-operated pressure regulating system are used for strengthening heating of pilot gas of a pressure guiding pipe in the pilot-operated pressure regulating system by means of series connection of two-stage vortex pipes, and the failure of ice blockage of a commander or the. The method is convenient to implement, simple to maintain, low in cost, good in safety, high in reliability and particularly has good general adaptability to different working conditions and environmental conditions.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage eddy current series enhanced heating system and method of a high-pressure low-temperature pilot-operated pressure regulating system according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of a vortex thermal mass separator 7 according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the eddy current heater 14 according to the embodiment of the present invention.
In the figure:
1-a gas pipeline; 2-emergency shut-off valve; 3-pilot operated monitor valve; 4-pilot monitoring valve director; 5-pilot pressure regulating valve; 6-pilot type pressure regulating valve director; 7-vortex thermal mass separator; 8-inlet pipeline of vortex thermal mass separator; 9-control ball valve of inlet pipeline of vortex heat and mass separator; 10-cold air outlet pipeline of vortex thermal mass separator; 11-control ball valve of cold air outlet pipeline of vortex heat-mass separator; 12-hot gas outlet pipeline of vortex thermal mass separator; 13-control ball valve of hot gas outlet pipeline of vortex heat and mass separator; 14-a vortex heater; 15-outlet pipeline of vortex heater; 16-control ball valve of outlet pipeline of vortex heater; 17-a pressure guide pipeline before heating of pilot gas; 18-a control ball valve of a pilot gas heating front pressure guide pipeline; 19-a pressure guide pipeline after heating of pilot gas; 20, heating the pilot gas and then connecting a pressure guiding branch of a pilot type monitoring valve director; 21-a control ball valve connected with a pressure-leading branch of a pilot monitoring valve director after the pilot gas is heated; 22-leading gas is heated and then is connected with a pressure leading branch of a pilot type pressure regulating valve director; 23, connecting a control ball valve of a pressure guide branch of a pilot valve director after the pilot gas is heated; 24-outlet pipeline shared by pilot-operated monitoring valve director and pilot-operated pressure regulating valve director; 25-inlet of vortex thermal mass separator; 26-vortex thermal mass separator vortex chamber; 27-vortex thermal mass separator vortex tube; 28-heat insulating layer of vortex heat and mass separator; 29-hot end regulating valve of vortex thermal mass separator; 30-hot end outlet of vortex heat and mass separator; 31-vortex thermal mass separator cold end throttle valve; 32-outlet of cold end of vortex heat-mass separator; 33-vortex heater inlet; 34-vortex chamber of vortex heater; 35-vortex heater vortex tube; 36-vortex heater heat exchange channel; 37-inlet of heat exchange channel of vortex heater; 38-outlet of heat exchange channel of vortex heater; 39-vortex heater insulating layer; 40-vortex heater dead end; 41-vortex heater cold junction choke valve; 42-outlet of cold end of vortex heater; 43-vortex heater direct inlet control ball valve 43; p1-pressure gauge before pressure regulation at upstream of gas pipeline; p2 — pressure gauge between pilot monitor valve and pilot pressure regulating valve; p3-pressure gauge after pressure regulation at downstream of gas pipeline; p4-hot gas outlet pressure gauge of vortex thermal mass separator; t1 — thermometer before pilot gas heating; t2 — thermometer after pilot gas heating; t3-pilot monitor valve director outlet thermometer; t4-exit thermometer of pilot pressure regulating valve director; t5-vortex thermal mass separator hot gas outlet thermometer.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention relates to a two-stage vortex series connection strengthening heating system of a high-pressure low-temperature pilot-operated pressure regulating system, which has the preferred embodiment that:
the method comprises the following steps that a pressure gauge before pressure regulation at the upstream of a gas transmission pipeline, an emergency cut-off valve, a pilot type monitoring valve, a pressure gauge between the pilot type monitoring valve and a pilot type pressure regulating valve, the pilot type pressure regulating valve and the pressure gauge after pressure regulation at the downstream of the gas transmission pipeline are sequentially connected in series along the gas flowing direction in the long gas transmission pipeline;
an inlet pipeline of the vortex thermal mass separator is led out between the emergency block valve and the pilot type monitoring valve and is connected with an inlet of the vortex thermal mass separator through a control ball valve;
a cold air outlet pipeline of the vortex thermal mass separator is connected with the downstream of the gas transmission pipeline through a ball valve; the hot gas outlet pipeline is connected with the vortex heater through a hot gas outlet thermometer of the vortex thermal mass separator and a control ball valve;
the outlet pipeline of the vortex heater is connected with the downstream of the gas pipeline through a control ball valve; a pressure guiding pipeline of the vortex heater before pilot gas heating is connected out by a gas transmission pipeline between the emergency cut-off valve and the pilot type monitoring valve and is connected into a heat exchange channel of the vortex heater through a thermometer and a control ball valve before pilot gas heating; the pressure guide pipeline of the vortex heater heated by the pilot gas is divided into two paths after passing through the thermometer heated by the pilot gas: one pressure guiding branch of the pilot monitoring valve director is connected with the pilot monitoring valve director through a control ball valve; the other route is connected with the pilot type pressure regulating valve director through a control ball valve by a pressure leading branch of the pilot type pressure regulating valve director;
the outlets of the pilot monitoring valve director and the pilot pressure regulating valve director are respectively connected with the downstream of the gas transmission pipeline through a common outlet pipeline after passing through a thermometer.
The vortex thermal-mass separator is characterized in that a heat insulation layer is arranged on the outer wall of the vortex thermal-mass separator, a vortex chamber is arranged inside the vortex chamber, an inlet of the vortex thermal-mass separator is tangentially arranged on the side wall of the vortex chamber, one end of the vortex chamber is connected with a vortex tube, a hot end adjusting valve and a hot end outlet are arranged at the rear end of the vortex tube, and a cold end throttle valve and a cold end outlet are arranged at the other end.
The vortex heater is characterized in that the outer wall of the vortex heater is provided with a heat insulation layer, the vortex chamber is arranged in the vortex heater, the side wall of the vortex chamber is tangentially provided with a vortex heater inlet, one end of the vortex chamber is connected with a heating pipe with a blind end, and the other end of the vortex chamber is provided with a vortex heater cold end throttle valve and a vortex heater cold end outlet;
and a heat exchange channel is arranged between the outer wall of the heating pipe with the blind end and the inner wall of the vortex heater, and the heat exchange channel is provided with a heat exchange channel inlet and a heat exchange channel outlet.
The invention discloses a method for realizing two-stage vortex series intensified heating by a two-stage vortex series intensified heating system of a high-pressure low-temperature pilot-operated pressure regulating system, which comprises the following steps:
the method comprises the following steps:
leading out natural gas from the long-distance natural gas pipeline, and providing a high-pressure vortex gas source for the vortex thermal mass separator after the natural gas is regulated by the control ball valve;
after the high-pressure natural gas is subjected to thermal mass separation in the vortex thermal mass separator, the cold gas part returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline after being regulated by a control ball valve of the cold gas outlet pipeline of the vortex thermal mass separator through the cold gas outlet pipeline of the vortex thermal mass separator; the hot gas part is displayed by a hot gas outlet pipeline of the vortex thermal mass separator through a hot gas outlet thermometer of the vortex thermal mass separator to have a preheating effect, and a vortex gas source is provided for the vortex heater at a pressure required by the optimal heating performance of the vortex heater after the control ball valve of the hot gas outlet pipeline of the vortex thermal mass separator is adjusted;
after further energy separation in the vortex heater, the hot gas returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline through an outlet pipeline of the vortex heater and a control ball valve of the outlet pipeline of the vortex heater; the pilot gas is transmitted from a gas transmission pipeline between the emergency cut-off valve and the pilot type monitoring valve, a pressure guide pipeline before the pilot gas is heated displays the initial temperature through a thermometer before the pilot gas is heated, and the pilot gas enters a heat exchange channel of the vortex heater for heating after being regulated by a control ball valve of the pressure guide pipeline before the pilot gas is heated; the heated pilot gas is heated by the pilot gas, and then the heated pilot gas is displayed by a thermometer heated by the pilot gas and then enters the director in two paths, one path of the heated pilot gas is heated by the pilot gas and then is connected with a pressure-guiding branch of the pilot type monitoring valve director, and the heated pilot gas enters the pilot type monitoring valve director after being regulated by a control ball valve of the branch; the other route is connected with a pressure guiding branch of the pilot type pressure regulating valve director after being guided and heated, and enters the pilot type pressure regulating valve director after being regulated by a control ball valve of the branch; after the pilot-operated monitoring valve director and the pilot-operated pressure regulating valve director complete the work, the pilot-operated gas respectively displays the cooling temperature through an outlet thermometer of the pilot-operated monitoring valve director and an outlet thermometer of the pilot-operated pressure regulating valve director, and the pilot-operated monitoring valve director and the pilot-operated pressure regulating valve director share an outlet pipeline, and returns to the downstream of the gas transmission pipeline at a pressure slightly higher than that of the downstream gas transmission pipeline.
The vortex thermal mass separator properly reduces the inlet pressure of the natural gas entering the vortex heater, so that the pressure difference and the pressure ratio of an inlet and an outlet of the vortex heater are in the range with the optimal energy separation effect; simultaneously raising the initial temperature of the natural gas entering the vortex heater, comprising the steps of:
high-pressure natural gas tangentially enters a vortex chamber of the vortex thermal mass separator from an inlet of the vortex thermal mass separator, forms a high-speed vortex in the vortex chamber, then spirally propels to a hot end outlet of the vortex thermal mass separator along a vortex tube of the vortex thermal mass separator, gradually forms two strands of gas with different temperatures and mass flows inside and outside the vortex tube, and preserves the heat of the hot gas outside through a heat preservation layer of the vortex thermal mass separator; after the gas reaches the hot end outlet of the vortex thermal mass separator, the central cold gas returns to the cold end outlet of the vortex thermal mass separator under the blocking action of the hot end regulating valve of the vortex thermal mass separator, and is discharged out of the vortex thermal mass separator after being throttled by the cold end throttle valve of the vortex thermal mass separator; after the hot gas on the outer side is throttled by the hot end regulating valve of the vortex thermal mass separator, the hot gas is discharged from the outlet of the hot end of the vortex thermal mass separator and is used as an inlet gas source of the vortex heater, so that the pressure-reducing thermal mass separation of the natural gas is completed.
The vortex heater utilizes the vortex thermal mass separator to carry out the air supply after the step-down heating preliminary treatment to the natural gas, accomplishes the first air guide intensive heating for improve heating temperature, include the step:
the pretreated natural gas tangentially enters a vortex chamber of the vortex heater from an inlet of the vortex heater, a high-speed vortex is formed in the vortex chamber, then the pretreated natural gas spirally advances to the blind end of the vortex heater along a vortex tube of the vortex heater, and energy separation is generated simultaneously, so that the temperature of the inner wall of a heat exchange channel of the vortex heater is increased; after being pushed to the blind end of the vortex heater, the vortex gas returns to the outlet of the cold end of the vortex heater under the blocking action of the blind end, and is discharged out of the vortex heater after being throttled by a throttle valve at the cold end of the vortex heater; firstly, introducing gas to enter from an inlet of a heat exchange channel of the vortex heater, after heat exchange with the vortex gas is completed in the heat exchange channel of the vortex heater, the temperature is obviously increased, and the gas is discharged out of the vortex heater through an outlet of the heat exchange channel of the vortex heater; the outside of the heat exchange channel of the vortex heater needs a heat-insulating layer of the vortex heater for good heat insulation.
The invention relates to a two-stage vortex series strengthening heating system and a two-stage vortex series strengthening heating method of a high-pressure low-temperature pilot-operated pressure regulating system, which aim at a natural gas distribution and transmission station under the condition of high pressure and low temperature, utilize two-stage vortex tubes to be connected in series, strengthen and heat pilot gas of a pressure guiding tube in the pilot-operated pressure regulating system, and prevent a commander or the pressure guiding tube behind the commander from being damaged by ice blockage. The method is convenient to implement, simple to maintain, low in cost, good in safety, high in reliability and particularly has good general adaptability to different working conditions and environmental conditions.
The principle of the two-stage vortex tube series connection strengthening heating method of the pilot-operated type pressure regulating system is shown in figure 1.
The pressure regulating system for the long-distance natural gas pipeline comprises a gas pipeline 1, a pressure gauge P1 before pressure regulation, an emergency cut-off valve 2, a pilot type monitoring valve 3, a pilot type monitoring valve director 4, a pressure gauge P2 between the pilot type monitoring valve and the pilot type pressure regulating valve, a pilot type pressure regulating valve 5, a pilot type pressure regulating valve director 6, a pressure gauge P3 after pressure regulation, pressure leading pipelines 17, 19, 20, 22 and 24, control ball valves 18, 21 and 23 of the pressure leading pipelines, pilot air temperature gauges T1, T2, T3 and T4. The delivery pressure of the upstream gas delivery line determines P1The size of (B), the downstream user's demand determines P3Size of (D), P1And P3Relatively independent, the difference value will fluctuate within a certain range, so a pressure regulating system is needed for dynamic monitoring and regulation, and P is enabled to be1、P2The requirements of upstream and downstream are met respectively, and the regulation process is as follows:
(1) under normal conditions, the emergency block valve 2 and the pilot type monitoring valve 3 are both in a full open state, and the pilot type pressure regulating valve director 6 is in accordance with the upstream and downstream pressure P1、P3Target value, real-time monitoring value and gas transmission quantity q of pipelinescAutomatically calculates and matches the opening size of the pilot pressure regulating valve 5, and transmits an opening regulating signal to the actuating mechanism to satisfy the following conditions:
wherein C is a unit conversion coefficient; q. q.sscFor the volume flow of the gas line in the standard state, 104m3D; k is the adiabatic index of natural gas; d5The corresponding flow aperture of the pilot pressure regulating valve 5 under the current opening degree is mm; z is the deviation coefficient of the natural gas; gamma raygIs the relative density of natural gas.
(2) When the pilot pressure regulating valve 5 fails or cannot work normally, P is caused2When the pressure is larger than the set value, the pilot type monitoring valve 3 starts to replaceThe pilot monitoring valve director 4 carries out temporary pressure regulation work in place of the pilot pressure regulating valve 5 according to the upstream and downstream pressure P1、P3Target value, real-time monitoring value and gas transmission quantity q of pipelinescAutomatically calculating and matching the opening size of the pilot type pressure regulating valve 3, and transmitting an opening regulating signal to an actuating mechanism to meet the following requirements:
in the formula (d)3Is the corresponding flow aperture, mm, of the pilot-operated monitoring valve 3 under the current opening.
(3) When an emergency accident happens to the gas pipeline, the pipeline is closed to supply gas through the remote control emergency cut-off valve 2. After the accident is eliminated, the pressure regulating system is enabled to enter the working state again through the manual reset emergency cut-off valve 2.
As can be seen from the above pressure regulating process, the pilot monitoring valve director 4 and the pilot pressure regulating valve director 6 collect pilot gas before and after pressure regulation in real time, and calculate the valve opening and transmit an opening regulating signal to the valve actuator according to the deviation from the target value, which is the key for the normal operation of the whole pressure regulating system, so it is necessary to ensure that the pressure guiding pipelines 17, 19, 20, 22, 24 and the channels of the pilot monitoring valve director 4 and the pilot pressure regulating valve director 6 are unblocked. If the pilot gas is not heated, the temperature T of the pilot gas flows through the pilot monitoring valve director 4 and the pilot pressure regulating valve director 6 under the action of Joule Thomson cooling effect0Become into
At this time, the pilot gas is at temperature T0Corresponding hydrate formation pressure P0Is composed of
In the formula, mujIs coke of natural gasThe ERThomson coefficient, DEG C/MPa, a is the equilibrium pressure of the natural gas for forming hydrate at 0 ℃, and K, β are coefficients related to the relative density of the natural gas.
If T is0≤Td≤0(TdWater dew point temperature, deg.C) of natural gas, or T0≤Td&P3≥P0In the outlet pipeline 24 shared by the pilot type monitor valve commander 4 and the pilot type pressure regulating valve commander 6, or the pilot type monitor valve commander and the pilot type pressure regulating valve commander, hydrates or ice crystals are generated.
Because the channels of the commander and the pressure guiding pipes behind the commander are narrow and complex, hydrates or ice crystals are easy to gather and block the channels, and the 'ice blockage' accident occurs, so that the pressure regulating system cannot work normally. Therefore, to prevent the "ice blockage" problem of the pressure regulating system, the pilot gas needs to be heated with enough power. At present, external heat source methods such as a water jacket furnace and electric tracing are mostly adopted in a pressure regulating system in the prior art, and the pressure regulating system has the defects of high energy consumption, short service life, frequent maintenance, large potential safety hazard and the like. Therefore, patents (CN103383045A, CN103383046A) propose a method of self-heating pilot gas by using vortex energy separation effect, i.e. the pilot gas is heated by the heat exchange channel of the vortex heater 14 before entering the pilot monitoring valve director 4 and the pilot pressure regulating valve director 6. It should be noted in particular that in patents CN103383045A, CN103383046A, the swirl heater 14 is operated in a single stage, taking the swirl gas directly from the pipe upstream through the pipe 8 and the direct inlet control ball valve 43. The temperature rises by Δ T after the gas is first introduced and heated by the vortex heater 14hThen enters a pilot type monitoring valve commander 4 and a pilot type valve commander 6, and finally discharges the temperature T of the pressure guiding pipe 24hIs composed of
Guiding air at temperature ThCorresponding hydrate formation pressure PhIs composed of
If T ish> 0 and P3＜PhIt is explained that the eddy heater 14 heats the pilot gas sufficiently, and the pressure regulating system does not generate "ice block". However, when the natural gas pipeline is under high pressure and low temperature conditions, such as the north section of the natural pipeline, P1Increase, T1Decrease, resulting in ThAnd PhWhile reducing, T may still occurh≤TdLess than or equal to 0 or Th≤Td&P3≥PhThe condition (1) causes the occurrence of an ice blockage accident, and shows that the temperature of the vortex tube heater 8 is increased by delta T for leading airhIs insufficient, and further increase in Δ T is requiredh。
However, for a single stage vortex heater, the lower inlet temperature T1And too large a throttle pressure difference (P)1-P3) The heating capability of the eddy current heater is weakened. In other words, under high-pressure and low-temperature conditions, on the one hand, the pilot gas requires a stronger heating capacity of the vortex heater; on the other hand, the single-stage eddy current heater has weaker heating performance under the working conditions of high pressure and low temperature. In order to solve the paradox, the invention introduces the vortex thermal mass separator 7, so that the hot gas outlet of the vortex thermal mass separator 7 is directly butted with the inlet of the vortex heater 14 through the connecting pipeline 12, and the hot gas separated by the vortex thermal mass separator 7 becomes the gas source of the vortex heater 14. Compared with the method of directly taking gas from the upstream of the pipeline, the inlet pressure of the vortex heater 14 is properly reduced, the inlet temperature is increased, and a working mode of connecting two stages of vortex tubes in series is formed, so that the pilot gas is intensively heated, and the pressure regulating system can not be blocked by ice even under the conditions of high pressure and low temperature.
From the structure of the system, the original pressure regulating device of the sub-transmission station is not changed and influenced, but only a set of two-stage vortex series devices are arranged on a bypass of the gas transmission pipeline 1 to realize the intensified heating of the pilot gas, so that the pilot monitoring valve director 4 and the pilot pressure regulating valve director 6 are prevented from being blocked by ice under the conditions of high pressure and low temperature. Therefore, the vortex thermal mass separator 7 and the vortex heater 14 are core devices of the present invention, and the device structure and the operation principle thereof are given in detail below:
the vortex thermal mass separator 7 is shown in fig. 2, and is a vortex tube device with a thermal mass separation function, which is provided by the invention, aiming at the problem that when a vortex heater 14 directly leads gas from the upstream of a natural gas pipeline 1 under the conditions of high pressure and low temperature, the heating capacity of the first gas guiding cannot meet the requirement and is increased, the main purpose is to reduce the pressure and raise the temperature, namely, the pressure of the inlet of the natural gas entering the vortex heater 14 is properly reduced, so that the pressure difference and the pressure ratio of the inlet and the outlet of the vortex heater 14 are in the range with the optimal energy separation effect; while raising the initial temperature of the natural gas entering the vortex heater 14. The structure and the principle are as follows: high-pressure natural gas tangentially enters a vortex chamber 26 of the vortex thermal mass separator from an inlet 25 of the vortex thermal mass separator to form a high-speed vortex in the vortex chamber, then spirally advances to a hot end outlet 30 of the vortex thermal mass separator along a vortex tube 27 of the vortex thermal mass separator, two strands of gas with different temperatures and mass flows are gradually formed inside and outside the vortex tube, and the heat of the hot gas on the outer side is preserved through a heat preservation layer 28 of the vortex thermal mass separator. After the gas reaches the hot end outlet 30 of the vortex thermal mass separator, the central cold gas returns to the cold end outlet 32 of the vortex thermal mass separator under the blocking action of the hot end regulating valve 29 of the vortex thermal mass separator, and is discharged out of the vortex thermal mass separator 7 after being throttled by the cold end throttle valve 31 of the vortex thermal mass separator; after the hot gas on the outer side is throttled by the hot end regulating valve 29 of the vortex thermal mass separator, the hot gas is discharged out of the vortex thermal mass separator 7 through the hot end outlet 30 of the vortex thermal mass separator and is used as an inlet gas source of the vortex heater 14, so that the pressure reduction thermal mass separation of the natural gas is completed.
The vortex heater 14 is a gas source obtained by performing 'pressure reduction heating' pretreatment on natural gas by using the vortex thermal mass separator 7, and completes the vortex tube device for performing air guide and enhanced heating. To increase the heating temperature, the heat exchange channel of the vortex heater 14 is designed as a single channel. The structure and the principle are as follows: the pretreated natural gas tangentially enters a vortex chamber 34 of the vortex heater from a vortex heater inlet 33, forms a high-speed vortex in the vortex chamber, and then spirally propels the vortex tube 35 of the vortex heater to a blind end 40 of the vortex heater, and simultaneously, energy separation is carried out, so that the temperature of the inner wall of a heat exchange channel 36 of the vortex heater is increased. After being pushed to the blind end 40 of the vortex heater, the vortex gas returns to the outlet 42 at the cold end of the vortex heater under the blocking action of the blind end, and is discharged out of the vortex heater 7 after being throttled by the throttle valve 41 at the cold end of the vortex heater. The first air is introduced through the vortex heater heat exchange channel 37, undergoes heat exchange with the vortex air in the vortex heater heat exchange channel 36, and then the temperature is significantly increased, and the first air is discharged out of the vortex heater 14 through the vortex heater heat exchange channel outlet 38. The outside of the vortex heater heat exchange channel 36 requires a vortex heater insulation 39 for good insulation.
The invention mainly solves the problem of ice blockage of the natural gas pipeline distribution pressure regulating device under the conditions of high pressure and low temperature, but has universality on other working conditions. When the pilot gas is not required to be heated intensively or the pilot gas is prevented from being overheated, the regulation and control of the heating temperature of the pilot gas can be completed by regulating the opening degree of the hot end regulating valve 29 of the vortex thermal mass separator, the regulation process needs to be gradually and slowly completed, and meanwhile, the temperature changes of the hot gas outlet thermometer T5 of the vortex thermal mass separator, the thermometer T1 before the pilot gas is heated, the thermometer T2 after the pilot gas is heated, the pilot monitoring valve commander outlet thermometer T3 and the pilot pressure regulating valve commander outlet thermometer T4 are closely observed, so that the excessive regulation is prevented. In addition, the control ball valve 9 of the inlet pipeline of the vortex thermal mass separator can be closed, and the control ball valve 43 of the direct air inlet of the vortex heater 14 can be opened, so that the vortex heater 14 can be switched to a traditional single-stage vortex heating device.
The invention has the advantages that:
1) two stages of vortex devices with different functions are connected in series, so that the heating capacity of the pilot gas is obviously improved;
2) the problem of ice blockage of the high-pressure low-temperature natural gas pipeline distribution pressure regulating device is thoroughly solved;
3) the combined adjustment of a plurality of valves is adopted, so that the universal heating device has universal adaptability to working conditions with different heating requirements, and the problem of overheating is avoided;
4) the device has the advantages of simple structure, convenient installation, flexible adjustment, safety, energy conservation, low cost, no moving part and no external energy, and has wide popularization and application prospect in the natural gas industry.
The specific embodiment is as follows:
the pressure before pressure regulation of the five-large-connection pool station is 8.3-10.9 MPa, the air supply pressure of 4 separate transmission users, such as fire in the five-large-connection pool, Huarun in North Anhua and Keshan Zhongyuan, is 3.2-4.0 MPa, the lowest outlet temperature is not heated to-20 ℃, and the pilot air temperature reaches more than 25 ℃ through the two-stage vortex series connection strengthening heating device of the high-pressure low-temperature pilot type pressure regulating system, and the structure is as shown in figure 1, and auxiliary equipment such as a vortex thermal mass separator 7, a vortex heater 14, a temperature sensor, a pressure sensor, a valve, a connecting pipeline and the like are added on the basis of a traditional prying type pressure regulating device (an emergency cut-off valve 2, a pilot type monitoring valve 3 and a pilot type pressure regulating valve. In the embodiment, the arrangement form and the function of the emergency cut-off valve 2, the pilot-operated monitoring valve 3 and the pilot-operated pressure regulating valve 5 in the pressure regulating device are not changed, no extra energy is consumed, a small amount of natural gas is introduced into the vortex thermal mass separator 7 only at the upstream of the gas transmission pipeline 1, part of hot gas is separated to be used as a vortex gas source of the vortex heater 14, and the vortex heater 14 is used for intensively heating the pilot gas of the pilot-operated monitoring valve 3 or the pilot-operated pressure regulating valve 5.
The device and the connection method adopted by the embodiment are as follows: an inlet pipeline 8 of the vortex thermal mass separator is led out between the emergency block valve 2 and the pilot-operated monitoring valve 3 and connected with an inlet of a vortex thermal mass separator 7, and after being regulated by a control ball valve 9 of the inlet pipeline of the vortex thermal mass separator, a high-pressure vortex air source is provided for the vortex thermal mass separator 7, the flow is 50Nm3/min, the temperature is-20 to-10 ℃, and the pressure is 8-11 MPa. After the high-pressure natural gas is subjected to thermal mass separation in the vortex thermal mass separator 7, a cold air part (with the flow rate of 25-30 Nm3/min) is regulated by a control ball valve 11 of a cold air outlet pipeline of the vortex thermal mass separator through a cold air outlet pipeline 10 of the vortex thermal mass separator to be slightly higher than P3Is returned to the downstream of the gas transmission pipeline 1; the hot gas part (the flow is 20-25 Nm3/min, the temperature is 0-10 ℃, the pressure is about 6 MPa) is regulated by a control ball valve 13 of a hot gas outlet pipeline of the vortex thermal mass separator and a vortex heater connecting pipeline 12 so as to meet the requirement of optimal heating of a vortex heater 14The pressure required for performance provides a source of vortex gas thereto. After further energy separation of the hot gas in the vortex heater 14, the hot gas passes from the outlet line 15 of the vortex heater through the control ball valve 16 of the outlet line of the vortex heater at a level slightly higher than P3Is returned downstream of the gas line 1. The pilot gas enters a heat exchange channel of the vortex heater 14 for heating after being regulated by a pilot gas pressure leading pipeline 17 before being heated and a control ball valve 18 of the pilot gas pressure leading pipeline before being heated from a gas transmission pipeline 1 between the emergency block valve 2 and the pilot type monitoring valve 3. The temperature of the heated pilot gas is ensured to be above 25 ℃, the pilot gas heated pressure guide pipeline 19 enters the director in two paths, one path is heated by the pilot gas and then is connected with a pressure guide branch 20 of the pilot type monitoring valve director, and the pressure guide branch enters the pilot type monitoring valve director 4 after being regulated by the control ball valve 21; the other route is connected with a pressure leading branch 22 of the pilot type pressure regulating valve director after leading gas and heating, and enters the pilot type pressure regulating valve director 6 after being regulated by a control ball valve 23. After the pilot gas finishes working in the pilot type monitoring valve director 4 and the pilot type pressure regulating valve director 6, the outlet pipeline 24 shared by the pilot type monitoring valve director and the pilot type pressure regulating valve director is slightly higher than P3Is returned downstream of the gas line 1.
The parameters of the vortex thermal mass separator 7 (fig. 2) used in this example are as follows: the device is made of 316L stainless steel, the design pressure is 12MPa, and the design temperature is 80 ℃; the nozzle 25 is a 4mm square nozzle; the diameter of the vortex chamber 26 is 30mm, and the length is 25 mm; the vortex tube 27 has a diameter of 16mm and a length of 720 mm; the inlet and outlet of the loop are connected by a 12.7mm pipeline, the inlet of the loop is provided with 12.7mm NPTM threads, one end of the loop is provided with an NPTF thread buckle, and the other end of the loop is provided with a 12.7mm cutting sleeve; the outlet is 12.7mmNPTF, and NPTM threaded ball valves are used at both ends; the connecting pipeline is a stainless steel cutting sleeve with the diameter of 12.7 mm; the insulating layer 28 is made of glass wool and has a thickness of 25 mm.
The parameters of the eddy current heater 14 (fig. 3) used in this example are as follows: the device is made of 316L stainless steel, the design pressure is 12MPa, and the design temperature is 80 ℃; the nozzle 25 is a 4mm square nozzle; the diameter of the vortex chamber 33 is 30mm, and the length is 25 mm; the vortex tube 36 has a diameter of 16mm and a length of 720 mm; the connection with the pilot valve director adopts a standard NPT interface of 6.35 mm; the inlet and outlet of the vortex loop are connected by a 12.7mm pipeline, the inlet of the vortex loop is provided with 12.7mm NPTM threads, one end of the vortex loop is provided with an NPTF thread buckle, and the other end of the vortex loop is provided with a 12.7mm cutting sleeve; the outlet is 12.7mmNPTF, and NPTM threaded ball valves are used at both ends; the connecting pipeline is a stainless steel ferrule with the diameter of 12.7 mm. The insulating layer 28 is made of glass wool and has a thickness of 25 mm.
The parameters of the vortex thermal mass separator 7 and the vortex heater 14 can be optimized and adjusted, and the structure can be further improved, so that the aim of avoiding ice blockage accidents in the commander and the pressure guiding pipe due to air guide is fulfilled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A two-stage vortex series connection strengthening heating system of a high-pressure low-temperature pilot-operated pressure regulating system is characterized in that a pressure gauge (P1) before pressure regulation at the upstream of a gas transmission pipeline, an emergency cut-off valve (2), a pilot-operated monitoring valve (3), a pressure gauge (P2) between the pilot-operated monitoring valve and a pilot-operated pressure regulating valve, a pilot-operated pressure regulating valve (5) and a pressure gauge (P3) after pressure regulation at the downstream of the gas transmission pipeline (P3) are sequentially connected in series in a long natural gas transmission pipeline along the gas flowing direction;
an inlet pipeline (8) of the vortex thermal mass separator is led out between the emergency block valve (2) and the pilot type monitoring valve (3) and is connected with an inlet of the vortex thermal mass separator (7) through a control ball valve (9);
a cold air outlet pipeline (10) of the vortex heat and mass separator (7) is connected with the downstream of the gas transmission pipeline (1) through a ball valve (11); the hot gas outlet pipeline (12) is connected with the vortex heater (14) through a hot gas outlet thermometer (T5) of the vortex thermal mass separator and a control ball valve (13);
an outlet pipeline (15) of the vortex heater (14) is connected with the downstream of the gas transmission pipeline (1) through a control ball valve (16); a pressure guide pipeline (17) of the vortex heater (14) before being heated by pilot gas is connected out from a gas transmission pipeline (1) between the emergency cut-off valve (2) and the pilot monitoring valve (3) and is connected into a heat exchange channel of the vortex heater (14) through a thermometer (T1) and a control ball valve (18) before being heated by the pilot gas; the pressure guide pipeline (19) heated by the pilot gas of the eddy heater (14) is divided into two paths after passing through a thermometer (T2) heated by the pilot gas: one pressure-leading branch (20) of the pilot-operated monitoring valve director is connected with the pilot-operated monitoring valve director (4) through a control ball valve (21); the other route is connected with the pilot type pressure regulating valve director (6) through a control ball valve (23) by a pressure leading branch (22) of the pilot type pressure regulating valve director;
the outlets of the pilot-operated monitoring valve director (4) and the pilot-operated pressure regulating valve director (6) are respectively connected with the downstream of the gas transmission pipeline (1) through a common outlet pipeline (24) after passing through thermometers (T3 and T4).
2. The two-stage vortex series-connection intensified heating system of the high-pressure low-temperature pilot-operated pressure regulating system according to claim 1, characterized in that an insulating layer (28) is arranged on the outer wall of the vortex heat-mass separator (7), a vortex chamber (26) is arranged inside the vortex heat-mass separator, an inlet (25) of the vortex heat-mass separator is tangentially arranged on the side wall of the vortex chamber (26), one end of the vortex chamber (26) is connected with a vortex tube (27), a hot end regulating valve (29) and a hot end outlet (30) are arranged at the rear end of the vortex tube (27), and a cold end throttle valve (31) and a cold end outlet (32) are arranged at the other end of.
3. The two-stage vortex series-connection strengthening heating system of the high-pressure low-temperature pilot-operated pressure regulating system according to claim 1, wherein a heat insulation layer (39) is arranged on the outer wall of the vortex heater (14), a vortex chamber (34) is arranged inside the vortex heater, a vortex heater inlet (33) is tangentially arranged on the side wall of the vortex chamber (34), one end of the vortex chamber (34) is connected with a heating pipe with a blind end (40), and a vortex heater cold-end throttling valve (41) and a vortex heater cold-end outlet (42) are arranged at the other end of the vortex chamber;
a heat exchange channel (36) is arranged between the outer wall of the heating pipe with the blind end (40) and the inner wall of the vortex heater (14), and the heat exchange channel (36) is provided with a heat exchange channel inlet (37) and a heat exchange channel outlet (38).
4. A method for realizing two-stage eddy series intensified heating of the two-stage eddy series intensified heating system of the high-pressure low-temperature pilot-operated pressure regulating system of claim 1, 2 or 3, which is characterized by comprising the following steps:
the natural gas is led out from the natural gas long-distance pipeline and is regulated by a control ball valve (9), and then a high-pressure vortex gas source is provided for a vortex thermal mass separator (7);
after the high-pressure natural gas is subjected to heat-mass separation in the vortex heat-mass separator (7), the cold gas part is regulated by a control ball valve (11) of the cold gas outlet pipeline of the vortex heat-mass separator through a cold gas outlet pipeline (10) of the vortex heat-mass separator and then returns to the downstream of the gas transmission pipeline (1) at a pressure slightly higher than P3; the hot gas part is preheated by a hot gas outlet pipeline (12) of the vortex thermal mass separator and a hot gas outlet thermometer (T5) of the vortex thermal mass separator, and a vortex gas source is provided for the vortex heater (14) at the pressure required by the optimal heating performance after the control ball valve (13) of the hot gas outlet pipeline of the vortex thermal mass separator is adjusted;
after further energy separation in the vortex heater (14), the hot gas returns to the downstream of the gas transmission pipeline (1) through a control ball valve (16) of an outlet pipeline (15) of the vortex heater at a pressure slightly higher than P3; the pilot gas is transmitted to a gas pipeline (1) between the emergency cut-off valve (2) and the pilot type monitoring valve (3), the initial temperature is displayed by a pilot gas pressure guide pipeline (17) before being heated by the pilot gas through a temperature gauge (T1) before being heated by the pilot gas, and the pilot gas enters a heat exchange channel of a vortex heater (14) for heating after being regulated by a control ball valve (18) of the pilot gas pressure guide pipeline before being heated by the pilot gas; the heated pilot gas is heated by the pilot gas, and then is displayed by a pressure guide pipeline (19) after being heated by the pilot gas and a thermometer (T2) after being heated by the pilot gas, and then enters the pilot valve director in two paths, one path is heated by the pilot gas and then is connected with a pressure guide branch (20) of the pilot monitoring valve director, and the pressure guide branch is adjusted by a control ball valve (21) and then enters the pilot monitoring valve director (4); the other route is connected with a pressure leading branch (22) of the pilot type pressure regulating valve director after leading gas and heating, and enters the pilot type pressure regulating valve director (6) after being regulated by a control ball valve (23); after the pilot gas finishes working in the pilot monitoring valve director (4) and the pilot pressure regulating valve director (6), the pilot gas respectively displays the cooling temperature through a pilot monitoring valve director outlet thermometer (T3) and a pilot pressure regulating valve director outlet thermometer (T4), and the pilot monitoring valve director and the pilot pressure regulating valve director share an outlet pipeline (24) and return to the downstream of the gas transmission pipeline (1) at a pressure slightly higher than P3.
5. The method for realizing the two-stage vortex series intensified heating of the high-pressure low-temperature pilot-operated pressure regulating system according to claim 4, wherein the vortex thermal mass separator (7) moderately reduces the inlet pressure of the natural gas entering the vortex heater (14) so that the pressure difference and the pressure ratio of the inlet and the outlet of the vortex heater (14) are in the range with the optimal energy separation effect; simultaneously raising the initial temperature of the natural gas entering the vortex heater (14), comprising the steps of:
high-pressure natural gas tangentially enters a vortex chamber (26) of the vortex thermal mass separator from an inlet (25) of the vortex thermal mass separator, forms a high-speed vortex in the vortex chamber, then spirally propels to a hot end outlet (30) of the vortex thermal mass separator along a vortex tube (27) of the vortex thermal mass separator, gradually forms two strands of gas with different temperatures and mass flows inside and outside the vortex tube, and preserves the heat of the outside through a heat preservation layer (28) of the vortex thermal mass separator; after the gas reaches a hot end outlet (30) of the vortex thermal mass separator, the central cold gas returns to a cold end outlet (32) of the vortex thermal mass separator under the blocking action of a hot end regulating valve (29) of the vortex thermal mass separator, and is discharged out of the vortex thermal mass separator (7) after being throttled by a cold end throttle valve (31) of the vortex thermal mass separator; the hot gas on the outer side is throttled by a hot end regulating valve (29) of the vortex thermal mass separator, and then is discharged out of the vortex thermal mass separator (7) through a hot end outlet (30) of the vortex thermal mass separator to be used as an inlet gas source of a vortex heater (14), so that the pressure-reducing thermal mass separation of the natural gas is completed.
6. The method for realizing the two-stage vortex series intensified heating of the high-pressure low-temperature pilot-operated pressure regulating system according to claim 5, wherein the vortex heater (14) completes the pilot-operated gas guide intensified heating by using the gas source obtained after the vortex thermal mass separator (7) performs the depressurization heating pretreatment on the natural gas for increasing the heating temperature, and comprises the following steps:
pretreated natural gas tangentially enters a vortex chamber (34) of the vortex heater from a vortex heater inlet (33), forms a high-speed vortex in the vortex chamber, then spirally propels the vortex chamber along a vortex tube (35) of the vortex heater to a vortex heater blind end (40), and simultaneously generates energy separation to increase the temperature of the inner wall of a heat exchange channel (36) of the vortex heater; after being pushed to a blind end (40) of the vortex heater, the vortex gas returns to a cold end outlet (42) of the vortex heater under the blocking action of the blind end, and is discharged out of the vortex heater (14) after being throttled by a cold end throttle valve (41) of the vortex heater; firstly, introducing gas from an inlet (37) of a heat exchange channel of the vortex heater, finishing heat exchange with the vortex gas in the heat exchange channel (36) of the vortex heater, obviously increasing the temperature, and discharging the gas out of the vortex heater (14) through an outlet (38) of the heat exchange channel of the vortex heater; the outer side of the heat exchange channel (36) of the vortex heater needs a heat preservation layer (39) of the vortex heater for good heat preservation.
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