Steam conveying system and cut tobacco dryer

Abstract

The invention relates to the technical field of cut tobacco processing, and provides a steam conveying system and a cut tobacco dryer. The first input end of the blowing-through device can be connected with the output end of the steam source, the steam source generates primary steam, and the output end of the blowing-through device can be connected with the input end of the dryer; the input end of the gas-liquid separator can be connected with the output end of the dryer and used for obtaining secondary steam and condensate water, the first output end of the gas-liquid separator can be connected with the second input end of the blowing-through device, and part of the secondary steam can enter the dryer through the blowing-through device and is used for obtaining condensate water. The second output end of the gas-liquid separator can be communicated with the condensate water main pipe and used for discharging condensate water. Therefore, condensate water in the dryer can be quickly discharged, the problem of uneven heating of the dryer is solved, and the processing quality and the processing consistency of tobacco shreds are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco shred processing, and in particular to a steam conveying system and a tobacco shred drying machine. Background Art

[0002] The moisture content of exported tobacco is an important process indicator of the tobacco drying machine. The moisture content is controlled by PID. The drying process is mainly based on the drying of the tube wall. The control accuracy of the tube wall temperature has an important impact on the actual moisture content of the exported tobacco. When the tobacco drying machine is drying tobacco, the control of the tube wall temperature is jointly determined by the feedforward mathematical model and the actual moisture feedback. A series of parameters such as feed flow, feed moisture, drying factor and outlet tobacco moisture set value are used as feedforward values ​​to establish a feedforward mathematical model; the actual moisture content and set value of the outlet tobacco moisture content are used as feedback values ​​to establish actual moisture feedback. The two form a closed-loop control of the tube wall temperature to ensure that the outlet tobacco moisture content is consistent with the set value.

[0003] However, in actual operation, a rapid pressure field cannot be established during the system startup phase, and the condensed water in the drum cannot be discharged quickly. Due to the uneven distribution of condensed water and untimely discharge, the temperature of the thin plate surface is different from the displayed temperature, affecting the drying quality of the tobacco.

[0004] Therefore, there is an urgent need for a steam delivery system and a wire drying machine to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a steam delivery system and a tobacco shred dryer, which can enable the condensed water in the dryer to be quickly discharged, solve the problem of uneven heating, and further improve the processing quality and consistency of tobacco shreds.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Steam delivery system, including:

[0008] A blowing device, wherein a first input end of the blowing device can be connected to an output end of a steam source, the steam source can generate primary steam, the output end of the blowing device can be connected to an input end of a dryer, a portion of the primary steam can be liquefied into condensed water inside the dryer, and another portion is converted into secondary steam, and the temperature of the secondary steam is not higher than that of the primary steam;

[0009] A gas-liquid separator, wherein the input end of the gas-liquid separator can be connected to the output end of the dryer to obtain the secondary steam and the condensed water. The first output end of the gas-liquid separator can be connected to the second input end of the blowing device, and part of the secondary steam can enter the dryer through the blowing device. The second output end of the gas-liquid separator can be connected to the condensed water main to discharge the condensed water.

[0010] As a preferred technical solution of the above-mentioned steam delivery system, the above-mentioned blowing device includes a mixing chamber, a throat and a diffusion chamber. The above-mentioned mixing chamber, the above-mentioned throat and the above-mentioned diffusion chamber are connected in sequence along the flow direction of the fluid. The flow cross-sectional area of ​​the mixing chamber and the flow cross-sectional area of ​​the diffusion chamber are both larger than the flow cross-sectional area of ​​the throat. The first input end and the second input end of the above-mentioned blowing device are connected to the above-mentioned mixing chamber; the above-mentioned fluid includes the above-mentioned primary steam and / or the above-mentioned secondary steam.

[0011] As a preferred technical solution of the above-mentioned steam delivery system, it also includes a first film valve, and the output end of the above-mentioned steam source is connected to the first input end of the above-mentioned blowing device through the above-mentioned first film valve, and the above-mentioned first film valve is used to adjust the flow rate of the above-mentioned primary steam entering the above-mentioned blowing device.

[0012] As a preferred technical solution of the above steam delivery system, it also includes a first pressure sensor and a second pressure sensor, which are respectively arranged at the output end and the input end of the above first film valve.

[0013] As a preferred technical solution of the above steam delivery system, it also includes a first filter, and the output end of the above steam source is connected to the first input end of the above blowing device through the above first filter.

[0014] As a preferred technical solution of the above-mentioned steam delivery system, it also includes a first safety valve. The output end of the above-mentioned blowing device is connected to the input end of the above-mentioned dryer through the above-mentioned first safety valve. The above-mentioned primary steam and / or the above-mentioned secondary steam can be discharged outside the above-mentioned steam delivery system through the above-mentioned first safety valve.

[0015] As a preferred technical solution of the above-mentioned steam delivery system, it also includes a second safety valve, which is installed on the above-mentioned gas-liquid separator, and part of the above-mentioned secondary steam can be discharged from the above-mentioned steam delivery system through the above-mentioned second safety valve.

[0016] As a preferred technical solution of the above-mentioned steam delivery system, it also includes a steam trap pump, which is used to drive the above-mentioned condensed water in the above-mentioned gas-liquid separator to flow to the above-mentioned condensed water main pipe, and the above-mentioned steam source can provide the above-mentioned primary steam to the above-mentioned steam trap pump for driving the above-mentioned steam trap pump.

[0017] As a preferred technical solution of the above-mentioned steam delivery system, it also includes an input pipeline and an output pipeline. The above-mentioned input pipeline and the above-mentioned blowing device are connected in parallel between the above-mentioned steam source and the above-mentioned dryer. The above-mentioned primary steam enters the above-mentioned dryer through the above-mentioned input pipeline or the above-mentioned blowing device. The above-mentioned output pipeline and the above-mentioned gas-liquid separator are connected between the above-mentioned dryer and the above-mentioned condensate water main pipe. The above-mentioned condensate enters the above-mentioned condensate water main pipe through the above-mentioned output pipeline or the above-mentioned gas-liquid separator.

[0018] A wire drying machine is also provided, comprising the above-mentioned steam source, the above-mentioned condensate main pipe, the above-mentioned dryer and the above-mentioned steam delivery system, the above-mentioned steam source can deliver the above-mentioned primary steam to the above-mentioned dryer through the above-mentioned blowing device, and the condensate in the above-mentioned dryer can be discharged to the above-mentioned condensate main pipe through the above-mentioned gas-liquid separator.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a steam delivery system, including a blowing device and a gas-liquid separator. The first input end of the blowing device can be connected to the output end of a steam source, the steam source can generate primary steam, the output end of the blowing device can be connected to the input end of a dryer, a part of the primary steam inside the dryer can be liquefied into condensed water, and the other part is converted into secondary steam, the temperature of the secondary steam is not higher than that of the primary steam; the input end of the gas-liquid separator can be connected to the output end of the dryer to obtain secondary steam and condensed water, the first output end of the gas-liquid separator can be connected to the second input end of the blowing device, part of the secondary steam can enter the dryer through the blowing device, and the second output end of the gas-liquid separator can be connected to the condensed water main pipe for discharging condensed water.

[0021] Specifically, in the initial startup stage, the steam source generates primary steam, and the primary steam enters the dryer through the blowing device to provide heat for the material in the dryer. Part of the primary steam is liquefied into condensed water in the process of heat release, and part of the condensed water is formed on the side wall of the dryer, and part of the primary steam is converted into secondary steam. With the introduction of the primary steam, part of the condensed water and the secondary steam enter the gas-liquid separator and are separated in the gas-liquid separator. Part of the secondary steam in the gas-liquid separator can be passed into the blowing device and re-introduced into the dryer, so that the pressure in the gas-liquid separator is reduced, that is, the pressure at the output end of the dryer is reduced, thereby increasing the pressure difference between the input end and the output end of the dryer, so that the secondary steam and condensed water inside the dryer are more inclined to flow into the gas-liquid separator, and then the condensed water hanging on the side wall of the dryer flows more easily into the gas-liquid separator, so that the dryer can be heated evenly.

[0022] A tobacco shred drying machine is also provided, comprising a steam source, a condensate main pipe, a dryer and a steam delivery system, wherein the steam source can deliver primary steam to the dryer through a blowing device, and the condensate in the dryer can be discharged to the condensate main pipe through a gas-liquid separator. In this way, the tobacco shred processing quality can be improved and the processing consistency can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the steam delivery system provided in an embodiment of the present invention.

[0025] In the figure:

[0026] 2. Steam source; 3. Dryer; 4. Condensate main pipe;

[0027] 10. Blow-through device;

[0028] 20. Gas-liquid separator;

[0029] 31. The first membrane valve;

[0030] 41. a first pressure sensor; 42. a second pressure sensor;

[0031] 61. First safety valve; 62. Second safety valve;

[0032] 71. Steam trap pump; 72. Balance pipeline; 73. Drain pipeline;

[0033] 81. Input pipeline; 82. Output pipeline. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1 As shown, the present invention provides a steam delivery system, including a blowing device 10 and a gas-liquid separator 20. Among them, the first input end of the blowing device 10 can be connected to the output end of the steam source 2, the steam source 2 can generate primary steam, the output end of the blowing device 10 can be connected to the input end of the dryer 3, a part of the primary steam inside the dryer 3 can be liquefied into condensed water, and the other part is converted into secondary steam, the temperature of the secondary steam is not higher than that of the primary steam; the input end of the gas-liquid separator 20 can be connected to the output end of the dryer 3 to obtain secondary steam and condensed water, the first output end of the gas-liquid separator 20 can be connected to the second input end of the blowing device 10, part of the secondary steam can enter the dryer 3 through the blowing device 10, and the second output end of the gas-liquid separator 20 can be connected to the condensed water main 4 for discharging condensed water.

[0039] Specifically, in the initial startup stage, the steam source 2 generates primary steam, and the primary steam enters the dryer 3 through the blowing device 10 to provide heat for the material in the dryer 3. Part of the primary steam is liquefied into condensed water during the heat release process, and part of the condensed water is formed on the side wall of the dryer 3, and part of the primary steam is converted into secondary steam. With the introduction of the primary steam, part of the condensed water and the secondary steam enter the gas-liquid separator 20 and are separated in the gas-liquid separator 20. Part of the secondary steam in the gas-liquid separator 20 can be passed into the blowing device 10 and re-introduced into the dryer 3, so that the pressure in the gas-liquid separator 20 is reduced, that is, the pressure at the output end of the dryer 3 is reduced, thereby increasing the pressure difference between the input end and the output end of the dryer 3, so that the secondary steam and condensed water inside the dryer 3 are more inclined to flow into the gas-liquid separator 20, thereby making it easier for the condensed water hanging on the side wall of the dryer 3 to flow into the gas-liquid separator 20, so that the dryer 3 can be heated evenly.

[0040] Optionally, the blowing device 10 includes a mixing chamber, a throat and a diffusion chamber, which are connected in sequence along the flow direction of the fluid, and the flow cross-sectional area of ​​the mixing chamber and the flow cross-sectional area of ​​the diffusion chamber are both larger than the flow cross-sectional area of ​​the throat, and the first input end and the second input end of the blowing device 10 are connected to the mixing chamber; the fluid includes primary steam and / or secondary steam.

[0041] Specifically, the blowing device 10 forms a Venturi structure through a mixing chamber, a throat and a diffusion chamber with variable diameters. The primary steam produced by the steam source 2 has a relatively high initial velocity, enters the mixing chamber through the first input end of the blowing device 10 and enters the throat and the diffusion chamber. Due to the rapid circulation of the primary steam, the air pressure in the mixing chamber is reduced, so that the secondary steam in the gas-liquid separator 20 is sucked into the mixing chamber from the second input end of the blowing device 10. The primary steam and the secondary steam are mixed in the mixing chamber to form mixed steam, and flow toward the throat and the diffusion chamber together. Since the secondary steam in the gas-liquid separator 20 is extracted by the blowing device 10, the air pressure in the gas-liquid separator 20 is reduced; since the flow channel cross-sectional area of ​​the throat is smaller than the flow channel cross-sectional area of ​​the mixing chamber, the flow velocity of the mixed steam increases and the pressure decreases, and since the flow channel cross-sectional area of ​​the diffusion chamber is larger than the flow channel cross-sectional area of ​​the throat, after the mixed steam enters the diffusion chamber from the throat, its flow velocity decreases and the pressure increases. In this way, the input end of the dryer 3 has a higher pressure, while the output end of the dryer 3 has a lower pressure. Due to the increase in the pressure difference between the input end and the output end of the dryer 3, the secondary steam and condensed water therein can more smoothly enter the gas-liquid separator 20. The Venturi structure enables automatic circulation between the blowing device 10 and the gas-liquid separator 20.

[0042] Optionally, the steam delivery system further includes a first film valve 31 , through which the output end of the steam source 2 is connected to the first input end of the blowing device 10 , and the first film valve 31 is used to adjust the flow rate of the primary steam entering the blowing device 10 .

[0043] The first membrane valve 31 is a valve that controls the fluid (liquid or gas) through the movement of a membrane. It is mainly composed of a valve body, a membrane, a valve stem, a valve seat and other components. The working principle is to use the pressure difference between the upper and lower sides of the membrane to deform the membrane, thereby driving the valve stem to move and open or close the valve. In this embodiment, the opening of the first membrane valve 31 is calculated by parameters such as the inlet tobacco flow rate, the inlet tobacco moisture, the drying factor, the actual value of the outlet tobacco moisture and the set value, and is automatically controlled and adjusted by the PLC to ensure that the actual moisture of the outlet tobacco is stable within a certain deviation from the set value.

[0044] Optionally, the steam delivery system further includes a first pressure sensor 41 and a second pressure sensor 42 , which are respectively disposed at the output end and the input end of the first film valve 31 .

[0045] In this embodiment, the first pressure sensor 41 and the second pressure sensor 42 are used to obtain the pressure values ​​of the primary steam at the input end and the output end of the first film valve 31 .

[0046] Optionally, the steam delivery system further includes a first filter, and the output end of the steam source 2 is connected to the first input end of the blowing device 10 through the first filter. The first filter is used to filter the primary steam output by the steam source 2, allowing only the primary steam to pass through, and intercepting other impurities entrained in the primary steam.

[0047] Optionally, the steam delivery system further includes a first safety valve 61 , and the output end of the blowing device 10 is connected to the input end of the dryer 3 through the first safety valve 61 , and the primary steam and / or secondary steam can be discharged out of the steam delivery system through the first safety valve 61 .

[0048] Generally, the first safety valve 61 is in a normally closed state. When the first safety valve 61 is in a closed state, the primary steam and / or secondary steam are discharged from the self-blowing device 10 and enter the dryer 3. However, when the pressure value at the input end of the dryer 3 is greater than the first pressure threshold preset in the first safety valve 61, the first safety valve 61 is opened, and part of the primary steam and / or secondary steam can be discharged to the outside of the steam delivery system through the first safety valve 61 to relieve pressure.

[0049] Optionally, the steam delivery system further includes a second safety valve 62 , which is installed on the gas-liquid separator 20 , and part of the secondary steam can be discharged from the steam delivery system through the second safety valve 62 .

[0050] Generally, the second safety valve 62 is in a normally closed state. When the second safety valve 62 is in a closed state, the gas-liquid separator 20 is in a relatively sealed state, and the secondary steam is stored in the gas-liquid separator 20 or enters the blowing device 10, that is, in the steam delivery system. When the pressure value in the gas-liquid separator 20 is greater than the second pressure threshold preset in the second safety valve 62, the second safety valve 62 opens, and part of the secondary steam can be discharged from the steam delivery system through the second safety valve 62 to relieve pressure.

[0051] Optionally, the steam delivery system further includes a steam trap pump 71 , which is used to drive the condensed water in the gas-liquid separator 20 to flow to the condensed water main pipe 4 . The steam source 2 can provide primary steam to the steam trap pump 71 for driving the steam trap pump 71 .

[0052] In this way, by driving the steam trap pump 71 with part of the primary steam produced by the steam source 2, the participation of other driving sources can be reduced. When the steam trap pump 71 is started, the condensed water in the gas-liquid separator 20 can be actively extracted. In this way, the pressure in the gas-liquid separator 20 can be further reduced, so that the pressure difference between the input and output ends of the dryer 3 is further increased.

[0053] The working principle of the steam trap pump 71 is that at the beginning, the water inlet check valve is opened, the water outlet check valve is closed due to the high back pressure, water enters the valve, and the float is at a low position; as the water level rises, the exhaust valve opens, the float reaches the highest controller and is in a critical switching state. The controller switches at a high position, closes the exhaust valve, opens the power steam or compressed air, injects power into the valve, and pushes the condensate in the pump to the high-pressure area. At this time, the water inlet check valve cannot enter water due to the high pressure inside the valve. When the float reaches a low position, the controller switches to close the power, opens the exhaust valve, and enters the next action cycle.

[0054] It should be noted that the steam trap pump 71 is actually a prior art, and its specific structure will not be described in detail here.

[0055] Furthermore, the steam trap pump 71 is connected to a balance line 72 and an exhaust line 73 so that the gas in the condensed water can be discharged smoothly without causing a steam lock phenomenon.

[0056] Optionally, the steam delivery system also includes an input pipeline 81 and an output pipeline 82, the input pipeline 81 and the blowing device 10 are connected in parallel between the steam source 2 and the dryer 3, the primary steam enters the dryer 3 through the input pipeline 81 or the blowing device 10, the output pipeline 82 and the gas-liquid separator 20 are connected between the dryer 3 and the condensate main pipe 4, and the condensate enters the condensate main pipe 4 through the output pipeline 82 or the gas-liquid separator 20.

[0057] Specifically, the steam delivery system also includes a first stop valve group, a second stop valve group, a third stop valve group and a fourth stop valve group. Among them, the first stop valve group includes a first stop valve A and a first stop valve B. The first stop valve A is installed between the blowing device 10 and the steam source 2, and is used to control the connection or disconnection between the steam source 2 and the blowing device 10; the first stop valve B is installed between the blowing device 10 and the dryer 3, and is used to control the connection or disconnection between the blowing device 10 and the dryer. The second stop valve group includes a second stop valve A and a second stop valve B. The second stop valve A is installed between the steam source 2 and the input pipeline 81, and is used to control the connection or disconnection between the steam source 2 and the input pipeline 81; the second stop valve B is installed between the input pipeline 81 and the dryer 3, and is used to control the connection or disconnection between the input pipeline 81 and the dryer. The third stop valve group includes a third stop valve A and a third stop valve B. The third stop valve A is installed between the dryer 3 and the gas-liquid separator 20, and is used to control the connection or disconnection between the dryer 3 and the gas-liquid separator 20; the third stop valve B is installed between the gas-liquid separator 20 and the blow-through device 10, and is used to control the connection or disconnection between the gas-liquid separator 20 and the blow-through device 10. The fourth stop valve group is installed between the dryer 3 and the condensate main pipe 4, and is used to control the connection or disconnection between the dryer 3 and the condensate main pipe 4.

[0058] When in use, one of the first stop valve group and the second stop valve group is opened. When the first stop valve group is opened, the third stop valve group is opened, and the second stop valve group and the fourth stop valve group are closed; conversely, when the second stop valve group is opened, the fourth stop valve group is opened, and the first stop valve group and the third stop valve group are closed.

[0059] Exemplarily, the first or second stop valve group can be opened according to the generation of condensed water in the dryer 3, that is, when the generation of condensed water increases, in order to quickly eliminate the condensed water, the first stop valve group is opened, otherwise the second stop valve group is opened.

[0060] A wire drying machine is also provided, comprising a steam source 2, a condensate main pipe 4, a dryer 3 and the above-mentioned steam delivery system, wherein the steam source 2 can deliver primary steam to the dryer 3 through a blowing device 10, and the condensate in the dryer 3 can be discharged to the condensate main pipe 4 through a gas-liquid separator 20.

[0061] Furthermore, the wire drying machine further comprises a rotary sealing joint, and the blowing device 10 is connected to the dryer 3 via the rotary sealing joint.

[0062] It should be noted that the rotary sealing joint is a prior art, and its specific structure and working principle are not described in detail here.

[0063] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A steam delivery system, characterized in that: include: A blowing device (10), wherein a first input end of the blowing device (10) can be connected to an output end of a steam source (2), the steam source (2) can generate primary steam, and the output end of the blowing device (10) can be connected to an input end of a dryer (3), wherein a portion of the primary steam inside the dryer (3) can be liquefied into condensed water, and another portion can be converted into secondary steam, wherein the temperature of the secondary steam is not higher than the temperature of the primary steam; A gas-liquid separator (20), wherein the input end of the gas-liquid separator (20) can be connected to the output end of the dryer (3) for obtaining the secondary steam and the condensed water, the first output end of the gas-liquid separator (20) can be connected to the second input end of the blowing device (10), part of the secondary steam can enter the dryer (3) through the blowing device (10), and the second output end of the gas-liquid separator (20) can be connected to the condensed water main pipe (4) for discharging the condensed water.

2. The steam delivery system according to claim 1, characterized in that: The blowing device (10) comprises a mixing chamber, a throat and a diffusion chamber, wherein the mixing chamber, the throat and the diffusion chamber are connected in sequence along the flow direction of the fluid, the flow channel cross-sectional area of ​​the mixing chamber and the flow channel cross-sectional area of ​​the diffusion chamber are both larger than the flow channel cross-sectional area of ​​the throat, and the first input end and the second input end of the blowing device (10) are connected to the mixing chamber; the fluid comprises the primary steam and / or the secondary steam.

3. The steam delivery system according to claim 1, characterized in that: It also comprises a first film valve (31), the output end of the steam source (2) is connected to the first input end of the blowing device (10) via the first film valve (31), and the first film valve (31) is used to adjust the flow rate of the primary steam entering the blowing device (10).

4. The steam delivery system according to claim 3, characterized in that: It also comprises a first pressure sensor (41) and a second pressure sensor (42), which are respectively arranged at the output end and the input end of the first film valve (31).

5. The steam delivery system according to claim 1, characterized in that: It also comprises a first filter, through which the output end of the steam source (2) is connected to the first input end of the blowing device (10).

6. The steam delivery system according to claim 1, characterized in that: It also includes a first safety valve (61), and the output end of the blowing device (10) is connected to the input end of the dryer (3) through the first safety valve (61), and the primary steam and / or the secondary steam can be discharged outside the steam delivery system through the first safety valve (61).

7. The steam delivery system according to claim 1, characterized in that It also includes a second safety valve (62), which is installed on the gas-liquid separator (20), and part of the secondary steam can be discharged from the steam delivery system through the second safety valve (62).

8. The steam delivery system according to claim 1, characterized in that It also includes a steam trap pump (71), which is used to drive the condensate in the gas-liquid separator (20) to flow to the condensate main pipe (4), and the steam source (2) can provide the steam trap pump (71) with the primary steam for driving the steam trap pump (71).

9. The steam delivery system according to claim 1, characterized in that: The invention also comprises an input pipeline (81) and an output pipeline (82), wherein the input pipeline (81) and the blowing device (10) are connected in parallel between the steam source (2) and the dryer (3), and the primary steam enters the dryer (3) through the input pipeline (81) or the blowing device (10), and the output pipeline (82) and the gas-liquid separator (20) are connected between the dryer (3) and the condensate main pipe (4), and the condensate enters the condensate main pipe (4) through the output pipeline (82) or the gas-liquid separator (20).

10. A wire drying machine, characterized in that: It comprises the steam source (2), the condensate main pipe (4), the dryer (3) and the steam delivery system according to any one of claims 1 to 9, wherein the steam source (2) can deliver the primary steam to the dryer (3) through the blowing device (10), and the condensate in the dryer (3) can be discharged to the condensate main pipe (4) through the gas-liquid separator (20).

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