CN220082817U - Constant heat system of gas replacement steel cylinder - Google Patents

Abstract

The utility model discloses a constant heat system of a gas replacement steel cylinder, which comprises: the steam control unit comprises a steam main pipe, a pressure control valve and a temperature control valve which are arranged on the steam main pipe, the heat exchange unit comprises a heat exchanger and a steel cylinder heating box, the exhaust unit comprises an exhaust main pipe, a plurality of first exhaust pipes, a butterfly valve, a fan and a check valve which are arranged on the first exhaust pipes, and the steam main pipe, the heat exchanger, the steel cylinder heating box, the first exhaust pipes and the exhaust main pipe are sequentially connected. The hot steam enters the tube side of the heat exchanger and heats the cold air introduced from the shell side of the heat exchanger to become hot air. The hot air is conveyed into the steel bottle heating box, and the hot air heats the body of the gas steel bottle at constant temperature, so that the problems of manual whole participation and passive civilized production caused by manual pouring of the steel bottle in the related technology are solved, and the potential safety hazard caused by an electric heating mode to a hydrogen system is effectively avoided.

Description

Constant heat system of gas replacement steel cylinder

Technical Field

The utility model relates to the technical field of gas replacement, in particular to a constant heat system of a gas replacement steel cylinder.

Background

The large-scale thermal power generating unit basically uses hydrogen as a cooling medium, the hydrogen is inflammable and explosive gas, and the gas in the generator needs to be replaced by an intermediate medium such as carbon dioxide and nitrogen before and after long-term shutdown or overhaul of the generator.

When the steel bottled gas is used as a preferable product in a large amount in various power generation enterprises, in the process of replacing the gas in the machine by using the steel bottle gas, the heat in the ambient air is required to be continuously absorbed in the process of releasing and converting the high-pressure liquid gas in the bottle into a gas state, so that the water vapor in the ambient air releases heat and is condensed into frost or even ice in the body of the steel bottle, the conversion efficiency and speed of the gas in the bottle from the liquid state to the gas state are seriously hindered, and the replacement work of the gas in the machine is even influenced.

In the related art, a large amount of cold water is used for pouring the steel cylinder or an electric heating blanket is laid on the surface of the steel cylinder to heat the steel cylinder, but the cold water is used for pouring the steel cylinder, so that the efficiency is low, manual whole participation is needed, a large amount of water flows to the ground to influence the civilized production of the surrounding environment, and the manner of laying the electric heating blanket can cause potential safety hazards to a generator hydrogen system.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides a constant heat system of a gas replacement steel cylinder, which heats cold air by using hot steam, heats the body of the gas steel cylinder by using the heated air, and has the characteristics of safety, high efficiency and flexible treatment.

The constant heat system of the gas replacement steel cylinder comprises: the steam control unit comprises a steam main pipe and a pressure control valve and a temperature control valve which are sequentially arranged on the steam main pipe along the direction from upstream to downstream, the heat exchange unit comprises a heat exchanger and a steel cylinder heating box, the heat exchanger is provided with a cold air input end, a hot air output end, a steam input end and a steam output end, a plurality of gas steel cylinders are arranged in the steel cylinder heating box, the steel cylinder heating box is provided with a hot air input end and a ventilation air output end, the output end of the steam main pipe is connected with the steam input end, the hot air output end is connected with the hot air input end, a pressure probe of the pressure control valve is arranged on an air inlet pipeline of a gas replacement system, a temperature measuring probe of the temperature control valve is arranged in the steel cylinder heating box, the ventilation air unit comprises a ventilation air main pipe, a plurality of first exhaust pipes and butterfly valves, fans and check valves which are sequentially arranged on the first exhaust pipes along the direction from upstream to downstream, the first exhaust pipes are connected with the ventilation air main pipe, and the ventilation air main pipe.

According to the gas replacement steel cylinder constant heat system provided by the embodiment of the utility model, hot steam enters the side of the heat exchanger tube under the control of the steam control unit, and cold air introduced into the side of the heat exchanger shell is heated to become hot air. The hot air is conveyed into the steel cylinder heating box, the hot air heats the body of the gas steel cylinder at a constant temperature, the problems that the efficiency of pouring the steel cylinder by using cold water is low and the civilized production is influenced in the related art are solved, and the problems of electric shock risks and potential safety hazards existing in the prior art that an electric heating blanket is laid on the surface of the steel cylinder or the steel cylinder is filled into the electric heating box (a plurality of electric heating rods are arranged in the box to indirectly heat the body of the steel cylinder when the temperature of the air in the box rises) are also effectively avoided.

In some embodiments, the steam control unit further comprises a pressure reducing valve disposed on the steam header upstream of the pressure control valve and a throttling device disposed within the steam header downstream of the temperature control valve.

In some embodiments, the steam control unit further comprises a shut-off valve and a first gate valve, both of which are provided on the steam header, the shut-off valve being located upstream of the pressure reducing valve, the first gate valve being located downstream of the temperature control valve and upstream of the throttling device.

In some embodiments, the steam control unit further comprises a steam sub-pipe and a first normally closed gate valve arranged on the steam sub-pipe, wherein an input end of the steam sub-pipe is connected with the steam main pipe between the pressure reducing valve and the pressure control valve, and an output end of the steam sub-pipe is connected with the steam main pipe between the first gate valve and the throttling device.

In some embodiments, the steam generator further comprises a straight drain pipe and a normally closed stop valve arranged on the straight drain pipe, wherein the input end of the straight drain pipe is connected with the steam mother pipe between the pressure reducing valve and the input end of the steam sub pipe.

In some embodiments, the output end of the straight drain pipe is connected with a low-level drain main pipe of the factory building through a funnel.

In some embodiments, the steam heat exchanger further comprises a steam exhaust pipe and a second gate valve arranged on the steam exhaust pipe, wherein the input end of the steam exhaust pipe is connected with the steam output end of the heat exchanger.

In some embodiments, the output end of the steam exhaust pipe is connected with a steam turbine condenser drain header.

In some embodiments, the exhaust unit further comprises a second exhaust pipe and a second normally closed gate valve arranged on the second exhaust pipe, wherein the input end of the second exhaust pipe is connected with the exhaust gas output end, and the output end of the second exhaust pipe is connected with the exhaust main pipe.

In some embodiments, the temperature within the cylinder heating chamber is in the range of 35-40 ℃, and the minimum allowable pressure for the gas cylinder is 0.1MPa.

Drawings

FIG. 1 is a schematic diagram of a constant heat system for a gas displacement cylinder in accordance with an embodiment of the present utility model.

Fig. 2 is a logic diagram of a temperature control method according to an embodiment of the present utility model.

Reference numerals:

the steam control unit 1, the steam main pipe 11, the pressure control valve 111, the temperature control valve 112, the pressure reducing valve 113, the throttling device 114, the stop valve 115, the first gate valve 116, the steam sub-pipe 12, the first normally closed gate valve 121, the straight-line pipe 13, the normally closed stop valve 131, the funnel 132,

A heat exchange unit 2, a heat exchanger 21, a steel cylinder heating box 22, a steam exhaust pipe 23, a second gate valve 231,

The exhaust unit 3, the exhaust main pipe 31, the first exhaust pipe 32, the butterfly valve 321, the fan 322, the check valve 323, the second exhaust pipe 33, and the second normally closed gate valve 331.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The following describes a constant heat system for a gas displacement cylinder according to an embodiment of the present utility model with reference to the accompanying drawings.

As shown in fig. 1, a constant heat system for a gas exchange steel cylinder according to an embodiment of the present utility model includes: a steam control unit 1, a heat exchange unit 2 and an exhaust unit 3.

It is to be understood that the upstream and downstream are defined in terms of the flow direction of the hot steam. The steam control unit 1 includes a steam header 11, a pressure control valve 111, and a temperature control valve 112, the pressure control valve 111 and the temperature control valve 112 being provided in this order on the steam header 11 in the upstream-downstream direction. The hot steam is used as a heat source of the constant heat system of the gas replacement steel cylinder in the embodiment of the utility model, for example, the heat source can come from an auxiliary steam system of a thermal power plant or a steam extraction system of a low-pressure area of a steam turbine, and the hot steam enters the steam main pipe 11 from the input end of the steam main pipe 11.

The heat exchange unit 2 includes a heat exchanger 21 and a cylinder heating box 22, the heat exchanger 21 having a cool air input, a hot air output, a steam input, and a steam output. The cylinder heating box 22 is provided with a plurality of gas cylinders, and the cylinder heating box 22 is provided with a hot air input end and a exhaust gas output end. The output end of the steam mother pipe 11 is connected with the steam input end of the heat exchanger 21, and the hot air output end of the heat exchanger 21 is connected with the hot air input end of the steel cylinder heating box 22.

It is understood that the gas cylinders are used in connection with gas displacement systems such as those provided in the hydrogen-cooled generator set gas displacement operations of the thermal power generation industry. In the process of replacing the gas in the hydrogen-cooled generator set by using the gas (carbon dioxide or nitrogen) in the gas steel bottle, the required heat is provided by the hot steam of the steam control unit 1.

The hot steam passes through the steam header 11 and sequentially enters the tube side of the heat exchanger 21 through the output end of the steam header 11 and the steam input end of the heat exchanger 21, and the cold air enters the shell side of the heat exchanger 21 through the cold air input end of the heat exchanger 21. The cold air and the hot steam are subjected to indirect heat exchange in the heat exchanger 21 to be heated into hot air, and the hot air sequentially passes through the hot air output end of the heat exchanger 21 and the hot air input end of the steel cylinder heating box 22 to enter the steel cylinder heating box 22, so that the hot air is utilized to heat the body of the gas steel cylinder in the steel cylinder heating box 22, the gas steel cylinder is in a constant-heat state, and the condition that the body of the gas steel cylinder frosts and freezes is avoided to influence the conversion efficiency and speed of the gas in the cylinder from liquid state to gas state.

Further, a pressure probe of the pressure control valve 111 is disposed on the gas inlet pipe of the gas substitution system, for detecting the pressure of the gas inlet pipe of the gas substitution system (i.e. the pressure of the residual gas in the gas cylinder). The pressure control valve 111 automatically opens when the gas pressure in the gas inlet line of the gas displacement system is above the minimum pressure required for the gas cylinder. The pressure control valve 111 automatically closes when the gas pressure in the gas inlet line of the gas displacement system is below the minimum pressure required for the gas cylinder.

The temperature probe of the temperature control valve 112 is disposed in the steel cylinder heating box 22 for detecting the ambient temperature in the steel cylinder heating box 22. The thermostatic valve 112 automatically opens when the temperature in the cylinder heating chamber 22 is below the maximum allowable temperature for the gas cylinder. When the temperature in the cylinder heating chamber 22 reaches the maximum allowable temperature of the gas cylinder, the temperature control valve 112 is automatically closed or completely closed, so that the cylinder heating chamber 22 is kept at a basically constant temperature, and the heat absorption requirement for releasing the high-pressure liquid gas from the gas cylinder is met.

The automatic start-stop function of the pressure control valve 111 and the temperature control valve 112 can be realized by being connected to a factory DCS control system or being connected to a programmable PLC controller independently.

The exhaust unit 3 includes an exhaust main pipe 31, a plurality of first exhaust pipes 32, and a butterfly valve 321, a fan 322, and a check valve 323 sequentially provided on the first exhaust pipes 32 in the upstream-to-downstream direction, the input end of the first exhaust pipe 32 is connected to the exhaust output end, and the output end of the first exhaust pipe 32 is connected to the exhaust main pipe 31.

Alternatively, as shown in fig. 1, the first exhaust pipes 32 have two, two first exhaust pipes 32 are arranged in parallel, and each first exhaust pipe 32 is provided with a butterfly valve 321, a fan 322 and a check valve 323. One of the two first exhaust pipes 32 is used, and the other is used for standby, and the check valve 323 is used for ensuring that the safety and stability of the constant heat system of the gas replacement steel cylinder are not affected when the fan 322 operates.

The hot air after heat exchange with the gas cylinder in the cylinder heating box 22 sequentially passes through the exhaust output end of the cylinder heating box 22 and the input end of the first exhaust pipe 32 to enter the first exhaust pipe 32, then is conveyed into the exhaust main pipe 31, and finally is discharged into the atmosphere through the exhaust main pipe 31.

Therefore, in the gas replacement steel cylinder constant heat system provided by the embodiment of the utility model, hot steam enters the tube side of the heat exchanger 21 under the control of the steam control unit 1, and the cold air introduced into the shell side of the heat exchanger 21 is heated to become hot air. The hot air is conveyed into the steel cylinder heating box 22, the hot air heats the body of the gas steel cylinder at constant temperature, the problems that the efficiency of pouring the steel cylinder by using cold water is low and the civilized production is affected in the related art are solved, and the problems of electric shock risks and potential safety hazards existing in the prior art that an electric heating blanket is laid on the surface of the steel cylinder or the steel cylinder is filled into the electric heating box (a plurality of electric heating rods are arranged in the box to indirectly heat the body of the steel cylinder when the temperature of the air in the box rises) are also effectively avoided.

In some embodiments, as shown in fig. 1, the steam control unit 1 further comprises a pressure reducing valve 113 and a throttle device 114. A pressure reducing valve 113 is provided on the steam header 11 upstream of the pressure control valve 111, and a throttle device 114 is provided in the steam header 11 downstream of the thermo valve 112.

It is understood that the pressure reducing valve 113 performs pressure reducing control on the flow of steam, and the throttle device 114 is a throttle plate. The hot steam is depressurized by the depressurization valve 113 and flows into the heat exchanger 21 under the control of the thermo valve 112 and the orifice. And, the pressure reducing valve 113 and the throttling device 114 can determine whether to need or select one or the other according to the parameters of the connected hot steam system.

In some embodiments, as shown in fig. 1, the steam control unit 1 further includes a stop valve 115 and a first gate valve 116, where the stop valve 115 and the first gate valve 116 are both disposed on the steam header 11, the stop valve 115 is located upstream of the pressure reducing valve 113, and the first gate valve 116 is located downstream of the thermo valve 112 and upstream of the throttle device 114.

It is understood that the stop valve 115 and the first gate valve 116 are used for isolating hot steam flowing through the steam header 11, and isolating the constant heat system of the gas replacement steel cylinder in the embodiment of the utility model when the constant heat system is overhauled or is stopped for a long time.

Thus, the steam control unit 1 has a functional flow of hot steam from the shut-off valve 115, the pressure reducing valve 113, the pressure control valve 111, the thermo valve 112, the first gate valve 116, and the orifice.

In some embodiments, as shown in fig. 1, the steam control unit 1 further includes a steam sub-pipe 12 and a first normally closed gate valve 121 provided on the steam sub-pipe 12. The input end of the steam sub-pipe 12 is connected to the steam header 11 between the pressure reducing valve 113 and the pressure control valve 111, and the output end of the steam sub-pipe 12 is connected to the steam header 11 between the first gate valve 116 and the throttle device 114.

It will be appreciated that a bypass is additionally provided between the pressure reducing valve 113 and the throttle device 114 for manually adjusting the intake of the heat exchanger 21 in case of failure of the pressure control valve 111, the temperature control valve 112 or in case of maintenance thereof.

In some embodiments, as shown in fig. 1, further comprises an in-line pipe 13 and a normally closed shut-off valve 131 provided on the in-line pipe 13. The input end of the straight exhaust pipe 13 is connected with a steam mother pipe 11 positioned between the pressure reducing valve 113 and the input end of the steam sub pipe 12, and the output end of the straight exhaust pipe 13 is connected with a low-level water discharge mother pipe of a factory building through a funnel 132.

The purpose of the straight drain pipe 13 is to drain the drain water generated by the constant heat system of the gas exchange steel cylinder to the outside of the system, and the funnel 132 can observe the drain water condition.

In some embodiments, as shown in fig. 1, the steam exhaust pipe 23 and the second gate valve 231 provided on the steam exhaust pipe 23 are further included. The input end of the steam exhaust pipe 23 is connected with the steam output end of the heat exchanger 21, and the output end of the steam exhaust pipe 23 is connected with the steam condenser drain header of the steam turbine.

That is, after the hot steam exchanges heat with the cold air in the heat exchanger 21, the gas replacement steel cylinder constant heat system in the embodiment of the utility model is discharged through the steam discharge pipe 23 and then is discharged back to the drain header of the condenser of the steam turbine.

In some embodiments, as shown in fig. 1, the exhaust unit 3 further includes a second exhaust pipe 33 and a second normally closed gate valve 331 provided on the second exhaust pipe 33. The input end of the second exhaust pipe 33 is connected to the exhaust gas output end, and the output end of the second exhaust pipe 33 is connected to the exhaust main pipe 31.

It can be understood that the exhaust unit 3 is provided with a bypass composed of a second normally closed gate valve 331 and a second exhaust pipe 33, so as to meet the operation requirement of the gas replacement steel cylinder constant heat system in the embodiment of the utility model when the fan 322 fails to exhaust.

In some embodiments, the temperature within the cylinder heating chamber 22 is in the range of 35-40 ℃, and the minimum allowable pressure for the gas cylinder is 0.1MPa.

As shown in fig. 2, the operation logic of the gas substitution cylinder constant heat system according to the embodiment of the present utility model is specifically described below.

When the temperature T measured by the temperature probe of the temperature control valve 112 is higher than the temperature set value T ₀ At this time, the opening degree of the thermo valve 112 is reduced.

When the temperature T measured by the temperature probe of the temperature control valve 112 is lower than the temperature set value T ₀ In this case, the opening of the thermostatic valve 112 is increased to maintain the temperature in the cylinder heating chamber 22 at the temperature set value T ₀ Between them.

When the temperature T measured by the temperature probe of the temperature control valve 112 reaches T ₁ When the temperature control valve 112 is closed.

When the pressure probe of the pressure control valve 111 detects that the pressure of the air inlet pipeline of the gas replacement system reaches or is lower than the minimum allowable pressure of the gas steel cylinderForce P, or temperature measured by temperature probe of thermostatic valve 112 reaches T ₁ And after 10 seconds the temperature has not yet fallen, the pressure control valve 111 is closed.

When the temperature control valve 112 and the pressure control valve 111 are closed at the same time, the fan 322 is shut down after a delay of 20 s.

Wherein the temperature is set to T ₀ The parameter range of (C) is 35-40 ℃, T ₁ The minimum allowable pressure P of the gas steel cylinder is 0.1MPa at 40 ℃.

In addition, the automatic start-stop function of the pressure control valve 111, the temperature control valve 112 and the blower 322 is realized by accessing a factory DCS control system or a programmable PLC controller separately.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (10)

1. A gas substitution cylinder constant heat system, comprising:

the steam control unit comprises a steam main pipe, and a pressure control valve and a temperature control valve which are sequentially arranged on the steam main pipe along the direction from upstream to downstream;

the heat exchange unit comprises a heat exchanger and a steel cylinder heating box, wherein the heat exchanger is provided with a cold air input end, a hot air output end, a steam input end and a steam output end, a plurality of gas steel cylinders are arranged in the steel cylinder heating box, the steel cylinder heating box is provided with a hot air input end and a spent gas output end, the output end of a steam main pipe is connected with the steam input end, the hot air output end is connected with the hot air input end, a pressure probe of a pressure control valve is arranged on an air inlet pipeline of a gas replacement system, and a temperature measuring probe of the temperature control valve is arranged in the steel cylinder heating box;

the exhaust unit comprises an exhaust main pipe, a plurality of first exhaust pipes, and a butterfly valve, a fan and a check valve which are sequentially arranged on the first exhaust pipes along the direction from upstream to downstream, wherein the input end of the first exhaust pipe is connected with the exhaust output end, and the output end of the first exhaust pipe is connected with the exhaust main pipe.

2. The gas displacement cylinder constant heat system according to claim 1, wherein the steam control unit further comprises a pressure reducing valve provided on the steam header upstream of the pressure control valve, and a throttle device provided in the steam header downstream of the temperature control valve.

3. The gas displacement cylinder constant heat system according to claim 2, wherein the steam control unit further comprises a shut-off valve and a first gate valve, both of which are provided on the steam header, the shut-off valve being located upstream of the pressure reducing valve, the first gate valve being located downstream of the temperature control valve and upstream of the throttle device.

4. A gas displacement cylinder constant heat system according to claim 3, wherein the steam control unit further comprises a steam sub-pipe and a first normally closed gate valve provided on the steam sub-pipe, an input end of the steam sub-pipe being connected to the steam main pipe between the pressure reducing valve and the pressure control valve, and an output end of the steam sub-pipe being connected to the steam main pipe between the first gate valve and the throttle device.

5. The constant heat system of claim 4, further comprising a straight drain pipe and a normally closed shut-off valve disposed on the straight drain pipe, an input end of the straight drain pipe being connected to the main steam pipe between the pressure reducing valve and an input end of the sub steam pipe.

6. The constant heat system of claim 5, wherein the output end of the straight drain pipe is connected with a low-level drain pipe of the factory through a funnel.

7. The constant heat system of a gas displacement steel cylinder according to claim 1, further comprising a steam exhaust pipe and a second gate valve provided on the steam exhaust pipe, wherein an input end of the steam exhaust pipe is connected to a steam output end of the heat exchanger.

8. The constant heat system of claim 7, wherein the output end of the exhaust pipe is connected to a drain header of a steam turbine condenser.

9. The constant heat system of a gas displacement steel cylinder according to claim 1, wherein the exhaust unit further comprises a second exhaust pipe and a second normally closed gate valve arranged on the second exhaust pipe, an input end of the second exhaust pipe is connected with the exhaust gas output end, and an output end of the second exhaust pipe is connected with the exhaust gas main pipe.

10. The constant heat system of claim 1, wherein the temperature in the cylinder heating chamber ranges from 35 ℃ to 40 ℃ and the minimum allowable pressure of the gas cylinder is 0.1MPa.