CN217843506U - Multi-channel temperature and pressure reducing device - Google Patents

Abstract

The utility model discloses a multichannel temperature and pressure reduction device, belong to fluidic temperature and pressure reduction device, steam pressure and temperature fluctuation appear when current temperature and pressure reduction device actual flow is less than 30%.

Description

Multi-channel temperature and pressure reducing device

Technical Field

The utility model relates to a fluidic device that reduces temperature and pressure, specifically a multichannel device that reduces temperature and pressure. It expands the range of variation of the flow rate (especially the steam flow rate), the steam outlet flow rate can be enlarged by 30-100-q% specified by the standard to 3-100-q% (q is defined as the outlet maximum design flow rate of the temperature-reducing and pressure-reducing device, which expresses the flow capacity of the temperature-reducing and pressure-reducing device), improving the heat energy utilization rate of the heating system.

Background

In many industrial fields, such as thermoelectric, light textile, pharmaceutical, petroleum, chemical, paper, printing and dyeing, steam is used as power to meet the requirements of the production process, and the flow demand varies greatly.

Steam suppliers such as power plants deliver steam according to the demand of users for steam, and waste is caused when the demand of users is small and the delivery amount is large. Moreover, the technical parameters such as temperature and pressure of the steam produced by the supplier are generally higher than the requirements of users, so that the steam needs to be subjected to temperature reduction and pressure reduction when being delivered to the users, and the temperature reduction and pressure reduction is realized by installing a temperature reduction and pressure reduction device in the steam delivery pipeline, wherein the maximum design flow of an outlet of the temperature reduction and pressure reduction device is consistent with the maximum delivery flow of the steam delivery pipeline. Meanwhile, the steam delivery pipeline is usually designed and constructed according to the maximum delivery flow, and technical parameters of steam such as temperature and pressure can meet the technical index requirements no matter the steam is delivered at a large flow or a small flow.

The existing temperature and pressure reducing device is characterized in that a steam channel is arranged in a shell, and the steam channel comprises a regulating valve, a Venturi tube and flute-shaped temperature reducing nozzles arranged in the Venturi tube. When the steam is conveyed, the steam enters the shell from the steam inlet, flows through the regulating valve and the Venturi tube and then flows out from the steam outlet. During the steam flows through the steam channel, the pressure is reduced by changing the flow resistance of the regulating valve, and the temperature-reducing water is sprayed into the Venturi tube through the temperature-reducing nozzle so that the water and the steam are mixed to reduce the temperature of the flowing steam.

However, in the conventional temperature and pressure reducing apparatus, since a steam passage including a regulating valve is provided in the housing, the regulating range of the steam flow is designed to be 30-100% by q, the regulating valve should be maintained at an opening of 30-100% (the opening corresponds to the flow), and when the actual flow of the temperature and pressure reducing apparatus is less than 30% by q, that is, the opening of the regulating valve is less than 30%, the adjustability of the regulating valve is extremely rapidly decreased, the steam flow rate is low, the steam pressure and temperature fluctuation are large, the steam mixing effect is not good, the temperature reducing effect is poor, and the drain volume of the pipeline behind the temperature and pressure reducing apparatus is large.

In order to realize a wide outlet steam flow variation range, a plurality of steam conveying pipelines different in size can be connected in parallel, so that the equipment investment is increased, the occupied area is enlarged, the plurality of steam conveying pipelines are started and stopped, the workload and the operation difficulty are increased, the potential safety hazards of the pipelines are greatly increased, and the service life of the equipment is shortened.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model and the technical task that provide are overcome current temperature and pressure reduction device actual flow and are less than 30 when the q governing valve adjustable performance extremely fast descends, and the steam velocity of flow is lower, and steam pressure and temperature fluctuation are big, and steam mixing effect is not good, and the temperature reduction effect is poor, and the pipeline hydrophobic volume behind the temperature and pressure reduction device defect such as big is provided a multichannel temperature and pressure reduction device.

In order to achieve the above object, the utility model discloses a multichannel temperature and pressure reduction device, which comprises a housin, the casing has steam inlet and steam outlet, characterized by: the steam heating device comprises a shell, and is characterized in that at least two parallel steam channels positioned between a steam inlet and a steam outlet are arranged in the shell, each steam channel comprises an adjusting valve and a steam pipe which are connected in sequence according to the steam flow direction, each adjusting valve comprises a valve port and a valve core, each valve core is configured to move relative to the valve port in a controllable mode so as to adjust the opening degree of the valve port, a temperature reducing nozzle is arranged in each steam pipe, and the temperature reducing nozzle is connected with a temperature reducing water valve positioned outside the shell through a water pipe.

The utility model discloses a multichannel temperature and pressure reduction device, because dispose two at least steam passageway that parallel, for exporting the same temperature and pressure reduction device of maximum design flow, the utility model discloses a steam passageway all is less than prior art's steam passageway, when stepping down to steam cooling, can open partial steam passageway (including the aperture that will make individual steam passageway adjusts to half-open state), close another partial steam passageway, thereby make very big partial steam passageway's governing valve homoenergetic work with the aperture more than 30%, keep the adjustable performance of governing valve at the preferred state, steam keeps higher velocity of flow, it is undulant to reduce steam pressure and temperature, guarantee steam mixing and to the temperature reduction effect of steam, guarantee to subtract the temperature, steam after the decompression accords with technical indicator, and then reduce the pipeline hydrophobic volume behind the temperature and pressure reduction device, and simultaneously, because the aperture of governing valve keeps more than 30%, the wearing and tearing of governing valve also can be alleviated, keep longer life. Thereby overcoming the disadvantages of the prior art.

Specifically, the cross-section of the steam channel is arranged in a straight line shape, a circular shape, a polygonal shape, a quincunx shape or other shapes.

In order to facilitate assembly and maintenance, a seat plate is arranged inside the shell, and the valve port is arranged on the seat plate. The seat plate separates the interior of the housing into a front cavity and a rear cavity according to the flow direction of steam, the valve core is located in the front cavity, and the steam pipe is located in the rear cavity.

In order to achieve a better temperature and pressure reducing effect, the steam pipe is a venturi pipe, the venturi pipe is a pipeline which is contracted firstly and then gradually expanded along the flow direction, and the pipeline comprises an inlet section, a contraction section, a throat and a diffusion section which are sequentially connected together from front to back, the inlet section is usually a short cylindrical pipe section, the contraction section is a conical pipe with the inner diameter gradually reduced, the throat is a short straight pipe section, and the diffusion section is a conical pipe with the inner diameter gradually expanded.

In order to facilitate control, the valve cores of the steam channels are driven to move by the same valve rod, so that the valve cores of the steam channels can be driven to act by only one execution power, the distances between the valve cores of the steam channels and the valve port are different from each other, so that when the valve cores of the steam channels are driven by the valve rod to move towards one direction, the regulating valves are sequentially and completely opened or completely closed, accordingly, the positions of the valve cores of the steam channels relative to the valve port are changed by simultaneously moving the valve cores of the steam channels, and the opening degree of the regulating valves of the steam channels is further changed.

In order to realize various flows, the flow configuration of the valve ports of different steam channels is different, and the required actual flow demand is realized through the combination of the flow of the valve ports of the steam channels.

In order to realize automatic control, the temperature-reducing nozzle is automatically opened, and the temperature-reducing nozzle is a spring nozzle. Therefore, the spring nozzle can be controlled to automatically spray the desuperheating water by adjusting the water pressure of the desuperheating water through the desuperheating water valve. Namely, when the water pressure of the desuperheating water is less than the set pressure of the spring nozzle, the spring nozzle is closed and does not spray the desuperheating water. When the water pressure of the desuperheating water reaches or is greater than the set pressure of the spring nozzle, the spring nozzle is opened and sprays the desuperheating water, and the desuperheating water can be atomized, so that a better water-vapor mixing effect is achieved.

In order to simplify the control, the spring nozzles arranged in the steam pipes of the steam channels are connected to the same temperature-reducing water valve through water pipes, the pressure difference of the spring nozzles in different steam pipes is different from each other, the spring nozzles can be controlled to automatically spray the temperature-reducing water by adjusting the water pressure of the temperature-reducing water through the temperature-reducing water valve, and the number of the opened spring nozzles is increased along with the increase of the water pressure of the temperature-reducing water. The spring nozzles in different steam pipes are opened along with the opening of the corresponding regulating valve and closed along with the closing of the corresponding regulating valve.

The orientation of the spring nozzle is the same as the flow direction of steam, so that the erosion of the spring nozzle caused by the fact that the front face of the steam impacts the spring nozzle is avoided, and the service life of the spring nozzle is shortened. In particular embodiments, the spring nozzle may be oriented opposite to the flow of steam or in other directions, in view of factors other than the effects of erosion.

The utility model discloses an at least two steam passage that parallel that are located between steam inlet and the steam outlet are set up in the inside of casing, single channel temperature-reducing pressure relief device the same for the maximum design flow of steam outlet, the utility model discloses a steam passage all is less than prior art's single steam passage, when stepping down to steam cooling, can open partial steam passage according to the demand of actual flow, close another part steam passage, thereby make the governing valve of very big part can work with the aperture more than 30%, keep the adjustable performance of governing valve at the preferred state, steam keeps higher velocity of flow, reduce steam pressure and temperature fluctuation, guarantee that steam mixes and to the temperature-reducing effect of steam, guarantee to reduce the temperature, steam after the decompression accords with technical index, and then reduce the pipeline hydrophobic volume behind the temperature-reducing pressure relief device. Because the opening degree of the regulating valve is kept above 30%, the abrasion of the regulating valve is relieved, and the service life is kept longer.

And, the foundation the utility model discloses a multichannel temperature and pressure reduction device only needs a pipeline can realize carrying the temperature and pressure reduction of steam, and the energy saving reduces the equipment investment.

The multi-channel temperature and pressure reducing device has simple structure, convenient operation and safe and reliable operation, and can realize automatic adjustment by an automatic control system during practical application; the device outlet steam flow variation range can be extended from 30-100% as specified by the standard to 3-100% to improve the heat energy utilization rate of the heating system.

Drawings

FIG. 1 is a schematic structural view of an embodiment 1 of the multi-channel temperature and pressure reducing device of the present invention;

FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;

FIG. 3 is a sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic illustration of the multi-channel desuperheating pressure reducing device of FIG. 1 with some of the steam channels open;

FIG. 5 is a schematic structural view of the multi-channel temperature and pressure reducing device of the present invention in example 2;

FIG. 6 is a sectional view taken along line C-C of FIG. 5;

FIG. 7 is a sectional view taken along line D-D of FIG. 5;

the reference numbers in the figures illustrate:

100, a shell body: 101 steam inlet, 102 steam outlet, 103 seat plate, 104 front cavity and 105 back cavity;

200 steam passage:

210 regulating valve: 211, 212, 213,

220 steam pipe;

310 a temperature reducing nozzle, 320 a water pipe and 330 a temperature reducing water valve;

400 valve stem, 401 connector.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention are intended to cover a non-exclusive inclusion, such that a method or article that comprises a list of features does not necessarily have to be limited to those features explicitly listed, but may include other features not explicitly listed that may be included in the method or article.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the technical features defined by the terms "first", "second", etc. have sequential concepts, and the defined technical features are only clearly distinguished from other technical features for clearly describing the defined technical features, but do not represent such naming in actual implementation, and therefore, cannot be construed as limiting the present invention.

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

Example 1

As shown in fig. 1 and 4, the multichannel temperature and pressure reducing device comprises a casing 100 having a steam inlet 101 and a steam outlet 102 for installing and connecting the multichannel temperature and pressure reducing device into a steam conveying pipeline, and a seat plate 103 provided inside the casing and separating the inside of the casing into a front cavity 104 and a rear cavity 105 according to a steam flow direction.

Four valve seats 211 are arranged on the seat plate 103 in a left-right parallel linear arrangement, each valve seat 211 is provided with a valve port 212, and in the specific implementation, the valve ports can be directly machined on the seat plate. In the front chamber 104, there is a connecting member 401, and the lower portion of the connecting member 401 is connected to four valve spools 213 which have different lengths and extend downward, and the four valve spools 213 correspond to the four valve ports 212 one by one. The upper portion of the connector 401 is connected to a valve stem 400, and the valve stem 400 extends upwardly out of the housing 100 for connection to an actuator. The corresponding valve port and the valve core form a regulating valve 210.

Four steam pipes 220, each of which is a venturi tube, are disposed in the rear chamber 105. The four steam pipes 220 correspond to the four valve ports 212 one by one.

The corresponding regulating valve 210 and the steam pipe 220 constitute one steam passage 200, so that there are four steam passages between the steam inlet and the steam outlet in the casing, and the four steam passages are arranged in a linear shape in cross section, as shown in fig. 2 to 3.

Therefore, the opening degree of each valve port can be changed by moving the actuator up and down with the stem 400 to change the positions of the lower end of the valve body 213 and the corresponding valve port 212. The four ports 212 are fully open in fig. 1, with the two ports on the left side closed and the two ports on the right side open in fig. 4. Arrows at corresponding positions in fig. 1-2 and 4 show the flow direction of steam and water.

Wherein, the flow rates of the four valve ports are configured differently, and the total flow rate of the four valve ports is the maximum design flow rate of the outlet of the temperature and pressure reducing device, which is 100 percent q. The flow rates when the four ports are completely opened from right to left are respectively 10% q, 15% q, 25% q, 50% q, the first port, the second port, the third port, and the fourth port are then 10% q, 15% q, 25% q, 50% q, respectively, then the flow rate of 10% q is reached when only the first port is completely opened, the flow rate of 25% q (10% q +15% q) is reached when the first port and the second port are completely opened, the flow rate of 50% q (10% q +15% q +25% q) is reached when the first port, the second port, and the third port are completely opened, and the flow rate of 100% q (10% q +15% q +25 q) is reached when the four ports are completely opened, the flow rate of 100% q (10% q +15 +25% q +50% q) is reached when the four ports are completely opened. During actual control, the first valve port, the second valve port, the third valve port and the fourth valve port can be in a half-open state (between full opening and full closing). Therefore, by means of the measure of configuring a plurality of steam channels, the maximum part of the regulating valve can work at the opening degree of more than 30 percent, and the defects of the prior art are overcome. Table 1 exemplifies the technical effect of the actual outlet flow of the desuperheating and depressurizing device, which expands the outlet steam flow variation range, which can be expanded to 3-100% by weight, improving the heat energy utilization rate of the heating system.

Although the flow rates of the four steam passages of the embodiment when the regulating valves are fully opened are different, the combination is not limited to this. In particular, other configurations of different flow rates are also possible. Or they may be the same, i.e. the flow rates when the regulating valves of the four steam channels are fully opened are all 25% q, the flow rates when the first port, the first port and the second port and the third port, and the four ports are fully opened reach 25% q, 50% q, 75% q, 100% q, respectively.

Moreover, the sequence of opening and closing of the regulating valves can be adjusted.

Table 1: the technical effect that the actual outlet flow of the temperature and pressure reducing device is different is achieved

In order to spray temperature-reducing water into steam to reduce the temperature of the steam, temperature-reducing nozzles 310 are arranged in the steam pipe of each steam channel, the temperature-reducing nozzles are spring nozzles and are connected with the same temperature-reducing water valve 330 positioned outside the shell through a water pipe 320, the pressure difference of the spring nozzles in different steam pipes is different from each other, and the pressure of the temperature-reducing water is adjusted through the temperature-reducing water valves, so that the spring nozzles in different steam pipes are opened along with the opening of corresponding adjusting valves and closed along with the closing of corresponding adjusting valves, the steam is cooled, and the waste of water sources is avoided. The orientation of the spring nozzle is the same as the flow direction of steam, namely the direction of the spring nozzle spraying the desuperheating water is the same as the flow direction of the steam on the whole, so that the spring nozzle is prevented from being rapidly eroded due to the fact that the steam impacts the spring nozzle from the front side, and the service life of the spring nozzle is shortened. The temperature-reducing water valve is used for controlling the spring nozzles in the four steam channels to supply water.

Example 2

As shown in fig. 5 to 7, the multi-channel temperature and pressure reducing device is different from that of embodiment 1 only in the distribution of the steam channels, and in this embodiment, the cross-sections of the steam channels are arranged in a square, that is, the cross-sections of four steam channels are located at the four corners of a square. Correspondingly, the cross-sections of the four spools are also arranged in a square pattern to correspond one-to-one with the ports of the four channels, as shown in FIGS. 6-7. And the distances between the four valve cores and the corresponding valve ports are different. The rest of the structure of this embodiment is the same as embodiment 1, and is not described in detail. The arrows at corresponding positions in fig. 5-6 show the flow direction of the steam and water.

In other embodiments, the steam channel and the valve core can be arranged in a circle, a polygon, a quincunx or other shapes.

Although each valve core is driven by the same valve rod to move in the previous embodiment, and the temperature reducing nozzles in each steam pipe are connected to the same temperature reducing water valve through the water pipe, in specific implementation, the valve cores and the temperature reducing nozzles in each steam pipe can be separately controlled, different flow regulation can be realized, and the effects of reducing pressure and temperature of steam can be achieved.

The direction of the steam inlet of the shell is vertical to that of the steam outlet, and the steam inlet and the steam outlet can be in a straight-through mode or other layout modes in specific implementation.

The steam channel, in addition to the straight-through structure shown in the figure, may be of a corner type or other types.

In practical application, the opening degrees of the valve rod and the temperature-reducing water valve are controlled by the actuating mechanism according to the temperature and the pressure of steam.

The utility model discloses a multichannel pressure and temperature reduction device also can regard as multichannel pressure and temperature reduction device, the multichannel pressure reduction device use of steam, can also regard as other fluidic pressure and temperature reduction device or mixing arrangement to use.

Claims (10)

1. Multichannel pressure and temperature reduction device, including casing (100), the casing has steam inlet (101) and steam outlet (102), characterized by: the steam heating device comprises a shell and is characterized in that at least two parallel steam channels (200) located between a steam inlet and a steam outlet are arranged inside the shell, each steam channel comprises an adjusting valve (210) and a steam pipe (220) which are connected in sequence according to the steam flow direction, each adjusting valve comprises a valve port (212) and a valve core (213), each valve core is configured to move relative to the corresponding valve port in a controllable mode so as to adjust the opening degree of the corresponding valve port, a temperature reducing nozzle (310) is arranged in each steam pipe (220), and each temperature reducing nozzle is connected with a temperature reducing water valve (330) located outside the shell through a water pipe (320).

2. A multi-channel temperature and pressure reducing apparatus as claimed in claim 1, wherein: the cross-section of the steam channel (200) is arranged in a linear shape, a circular shape, a polygonal shape or a quincunx shape.

3. A multiple-pass temperature and pressure reducing apparatus as defined in claim 1, wherein: a seat plate (103) is arranged in the shell (100), and the valve port (212) is arranged on the seat plate.

4. A multi-channel temperature and pressure reducing apparatus as claimed in claim 3, wherein: the seat plate (103) separates the interior of the casing into a front cavity (104) and a rear cavity (105) according to the steam flow direction, the valve core is positioned in the front cavity, and the steam pipe is positioned in the rear cavity.

5. A multiple-pass temperature and pressure reducing apparatus as defined in claim 1, wherein: the steam pipe is a venturi pipe.

6. A multi-channel temperature and pressure reducing apparatus as claimed in claim 1, wherein: the valve cores of the steam channels are driven to move by the same valve rod (400), and the distances between the valve cores of the steam channels and the valve ports are different, so that the regulating valves are completely opened or completely closed in sequence when the valve cores of the steam channels are driven to move by the valve rod.

7. A multiple-pass temperature and pressure reducing apparatus as claimed in claim 1 or 6, wherein: the flow configuration of the valve ports of different steam channels is different.

8. A multi-channel temperature and pressure reducing device as claimed in claim 6, wherein: the temperature reducing nozzle is a spring nozzle.

9. A multiple-pass temperature and pressure reducing apparatus as defined in claim 8, wherein: the spring nozzles arranged in the steam pipes of the steam channels are connected to the same temperature reduction water valve through water pipes, and the spring nozzles in different steam pipes are opened along with the opening of the corresponding regulating valve and closed along with the closing of the corresponding regulating valve due to different pressure differences.

10. A multi-channel temperature and pressure reducing device as claimed in claim 8, wherein: the spring nozzle is oriented in the same direction as the steam flow.

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