CN111911640A

CN111911640A - Regulating valve for shell-and-tube waste heat boiler

Info

Publication number: CN111911640A
Application number: CN202010675310.9A
Authority: CN
Inventors: 夏同伟; 张金亮; 李志强; 朱惠春; 黄嗣罗
Original assignee: 711th Research Institute of CSIC
Current assignee: Shanghai Marine Diesel Engine Research Institute; 711th Research Institute of CSIC
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-11-10

Abstract

The invention discloses a regulating valve for a shell-and-tube waste heat boiler, which comprises a valve seat, an annular baffle plate and a valve core, wherein the valve seat is provided with a valve seat; the valve seat comprises a valve seat cylinder and an annular valve seat plate arranged in the valve seat cylinder, the inner space of the valve seat cylinder is used for being communicated with the bypass pipe bundle, and the space between the valve seat cylinder and the rear smoke box is used for being communicated with the heat exchange pipe bundle; the annular baffle is used for being arranged to the rear smoke box and is spaced from the valve seat along the axial direction and the radial direction of the regulating valve; the valve core is movably arranged between the annular valve seat plate and the annular baffle plate and comprises a valve core inner cylinder, a valve core outer cylinder arranged on the outer side of the valve core inner cylinder, a first valve core plate arranged at one end, close to the annular baffle plate, of the valve core outer cylinder along the radial direction of the regulating valve and a swirl blade arranged at the valve core inner cylinder and/or the first valve core plate. According to the regulating valve disclosed by the invention, the bypass tube bundle process gas and/or the heat exchange tube process gas rotate when flowing through the swirl vanes, so that the mixing uniformity of the synthesis process gas can be quickly and effectively improved.

Description

Regulating valve for shell-and-tube waste heat boiler

Technical Field

The invention relates to the technical field of valve design, in particular to a regulating valve for a shell-and-tube waste heat boiler.

Background

The shell-and-tube type waste heat boiler has compact structure and can recover the waste heat of high-temperature and high-pressure gas, so the shell-and-tube type waste heat boiler is widely applied to the petrochemical industry. In the coal-to-synthesis ammonia, methanol and natural gas industry, a shell-and-tube type waste heat boiler is also widely used for recovering waste heat of high-temperature and high-pressure process gas. Usually, the process gas flow entering the shell-and-tube type waste heat boiler is changed within the range of 35-100%, and the temperature change of the inlet process gas is very small. Due to subsequent process requirements, the process gas temperature at the outlet of the shell-and-tube waste heat boiler is kept in a specific range. Generally, the shell-and-tube type waste heat boiler consists of two groups of tube bundles with different tube diameters, wherein the tube bundle with a larger tube diameter is arranged at the center as a bypass tube bundle, and the tube bundle with a smaller tube diameter is arranged at the periphery as a heat exchange tube bundle. The heat exchange coefficient of the bypass tube bundle is small, and the temperature of the process gas at the outlet of the bypass tube bundle is high; the heat exchange coefficient of the heat exchange tube bundle is large, and the temperature of the process gas at the outlet of the heat exchange tube bundle is low. The mixed process air temperature at the outlet of the shell-and-tube waste heat boiler can meet the process requirements by carrying out appropriate flow distribution and mixing on the high-temperature process air and the low-temperature process air.

The flow distribution of the high temperature process gas and the low temperature process gas is usually controlled by regulating valves. However, the conventional regulating valve cannot ensure the uniform mixing of the high-temperature process gas and the low-temperature process gas. If the temperature of the process air at the outlet of the shell-and-tube type waste heat boiler is not uniformly mixed, the normal operation of the subsequent process is influenced, the local overtemperature of the equipment can be caused, and the safety of the equipment is greatly influenced.

In addition, the regulating valves commonly used at present have the condition that the high-temperature process gas flow channel of the bypass tube bundle and the low-temperature process gas flow channel of the heat exchange tube bundle are completely closed. When the outer side driving mechanism of the regulating valve breaks down, the manual regulation fails, the load of the shell-and-tube waste heat boiler suddenly changes and the regulating valve does not reach the sudden working conditions such as action, the temperature of the mixed process gas is too high or too low, the process requirements cannot be met, and the safety of equipment can be influenced.

To this end, the present invention provides a regulating valve for a shell-and-tube waste heat boiler to at least partially solve the problems in the related art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to at least partially solve the above problems, the present invention provides a regulating valve for a shell-and-tube waste heat boiler, the regulating valve being used for the shell-and-tube waste heat boiler, the shell-and-tube waste heat boiler comprising a tube plate and a rear smoke box, the tube plate comprising a rear tube plate, a bypass tube bundle being arranged at a substantially central position of the tube plate, heat exchange tube bundles being arranged around the tube plate, the regulating valve being arranged in the rear smoke box and connected to the rear tube plate, the regulating valve comprising:

the valve seat comprises a valve seat barrel and an annular valve seat plate arranged in the valve seat barrel, the valve seat barrel is used for being connected to the rear tube plate, the inner space of the valve seat barrel is used for being communicated with the bypass tube bundle, and the space between the valve seat barrel and the rear smoke box is used for being communicated with the heat exchange tube bundle;

an annular baffle for disposition to the rear smoke box and spaced from the valve seat in axial and radial directions of the regulator valve;

a poppet movably disposed between the annular valve seat plate and the annular flapper, the poppet comprising:

a valve core inner cylinder;

the valve core outer cylinder is arranged on the outer side of the valve core inner cylinder;

the first valve core plate is annular and is arranged at one end of the valve core outer cylinder close to the annular baffle plate along the radial direction of the regulating valve; and

and the rotational flow blade is arranged at the valve core inner cylinder and/or the first valve core plate.

According to the regulating valve, the rotational flow blades are arranged at the valve core inner cylinder and/or the first valve core plate, so that the regulating valve is provided with the rotational flow channel, and further, the bypass tube bundle process gas flowing through the valve core inner cylinder and/or the heat exchange tube process gas flowing through the first valve core plate rotate when flowing through the rotational flow channel, strong mixing is generated after the regulating valve, the mixing uniformity of the synthesis process gas is rapidly and effectively improved, the normal operation of the subsequent process can be ensured, and the safety of equipment is greatly improved. Meanwhile, the rigidity of the air flow can be reduced due to the rotation of the synthetic process gas, the jet flow length of the air flow is shortened, the direct impact of the synthetic process gas on equipment can be effectively reduced, and the safety of the equipment is further improved.

Optionally, the swirl vanes include a plurality of first swirl vanes, and the plurality of first swirl vanes are arranged at intervals along the circumferential direction of the first spool plate on one side of the first spool plate close to the annular baffle.

Optionally, the swirl vane includes a plurality of second swirl vanes, and the plurality of second swirl vanes are disposed between the spool inner cylinder and the spool outer cylinder at intervals along a circumferential direction of the spool inner cylinder.

Optionally, the valve core further comprises a second valve core plate disposed at an end of the valve core inner barrel adjacent to the annular valve seat plate.

Optionally, the regulating valve further includes a spool shaft disposed in the spool inner cylinder and connected to the second valve core plate, and the spool shaft is movable along an axial direction of the spool inner cylinder to drive the spool to move between a first open position and a second open position along the valve seat cylinder.

Optionally, a first limiting member is disposed on one side of the annular baffle plate close to the first valve core plate, and when the valve core is located at the first open position, the first valve core plate abuts against the first limiting member.

Optionally, the valve seat further includes a second stopper, the second stopper is disposed on a side of the annular valve seat plate close to the valve element, and when the valve element is located at the second open position, the second valve core plate abuts against the second stopper.

Optionally, the valve seat further comprises a flow guide member, one end of the flow guide member is connected with the inner wall of the valve seat cylinder, and the other end of the flow guide member is connected with the inner circumferential wall of the annular valve seat plate.

Optionally, the valve core further includes a plurality of fixing plates, and the fixing plates are disposed in the valve core inner cylinder at intervals and used for fixing the valve core inner cylinder and the valve core shaft.

Optionally, the second plurality of swirl vanes are disposed obliquely to a radial cross-section of the spool.

Optionally, the plurality of first swirl vanes are disposed obliquely with respect to a radial direction of the first spool plate.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a partial cross-sectional view of a regulating valve according to a preferred embodiment of the present invention installed in a shell and tube waste heat boiler;

FIG. 2 is a schematic perspective view of a valve cartridge of a regulator valve according to a preferred embodiment of the present invention;

FIG. 3 is a schematic illustration of a front view of a valve cartridge of a regulator valve in accordance with a preferred embodiment of the present invention;

FIG. 4 is an axial cross-sectional schematic view of a valve spool of a regulator valve in accordance with a preferred embodiment of the present invention; and

FIG. 5 is an axial cross-sectional schematic view of a valve seat of a regulator valve according to a preferred embodiment of the present invention.

Description of reference numerals:

10: rear tube plate 11: bypass tube bundle

12: the heat exchange tube bundle 20: rear smoke box

30: the regulating valve 31: valve seat

311: the seat cylinder 312: annular valve seat plate

313: the second limiting member 314: flow guiding piece

32: annular baffle 321: first position limiting part

33: the spool 331: valve core inner barrel

332: valve core outer cylinder 333: first valve core plate

334: first swirl vane 335: second swirl vane

336: second valve core plate 337: valve core shaft

338: fixing plate

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. It should be noted that ordinal numbers such as "first" and "second" are used in the invention only for identification and do not have any other meanings, such as a specific order. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component". The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for purposes of illustration only and are not limiting.

Referring to FIG. 1, a preferred embodiment of a regulating valve 30 for a shell and tube waste heat boiler of the present invention is described. For simplicity, fig. 1 only schematically shows a partial structural schematic view of the regulating valve 30 mounted on the shell-and-tube waste heat boiler.

The shell and tube waste heat boiler comprises a tube sheet, a smoke box and a regulating valve 30. The tube sheets include a front tube sheet (not shown) and a rear tube sheet 10, and the smoke box includes a front smoke box (not shown) and a rear smoke box 20. The regulating valve 30 is disposed in the rear smoke box 20 and connected with the rear tube plate 10. The approximate center of the tube plate is provided with a bypass tube bundle 11, and the periphery of the tube plate is provided with a heat exchange tube bundle 12. That is, the two ends of the bypass tube bundle 11 and the heat exchange tube bundle 12 are connected to the front tube plate and the rear tube plate 10, respectively. The bypass tube bundle 11 is arranged at the approximate center position of the front tube plate and the rear tube plate 10, the heat exchange tube bundle 12 is arranged at the periphery of the front tube plate and the rear tube plate 10, namely, the heat exchange tube bundle 12 is arranged at the periphery of the bypass tube bundle 11, and the diameter of the bypass tube bundle 11 is larger than that of the heat exchange tube bundle 12.

The process gas entering the shell-and-tube waste heat boiler is divided into two streams, one stream flows into the heat exchange tube bundle 12, namely the process gas of the heat exchange tubes, and flows out of the heat exchange tube bundle 12 after heat exchange; the other flow of the gas flows into the bypass tube bundle 11, namely the bypass tube process gas, and flows out of the bypass tube bundle 11 after heat exchange. Because the heat exchange coefficient of the bypass tube bundle 11 is lower than that of the heat exchange tube bundle 12, the temperature of the bypass tube process gas at the outlet of the bypass tube bundle 11 is higher than that of the heat exchange tube process gas at the outlet of the heat exchange tube bundle 12. The high-temperature bypass pipe process gas and the low-temperature heat exchange pipe process gas are subjected to flow regulation and distribution through the regulating valve 30, and then enter the rear smoke box 20 to be mixed to form the synthesis process gas with a certain temperature, so that the synthesis process gas meeting the process temperature requirement is provided for the subsequent process.

Specifically, the regulator valve 30 includes a valve seat 31, an annular baffle 32, and a spool 33.

The valve seat 31 includes a valve seat cylinder 311 and an annular valve seat plate 312 provided in the valve seat cylinder 311. The valve seat barrel 311 is used for attachment to the rear tube plate 10, for example by welding. The valve seat cylinder 311 is preferably mounted coaxially with the waste heat boiler. The inner space of the valve seat cylinder 311 is used for communicating with the bypass tube bundle 11, and the space between the valve seat cylinder 311 and the rear smoke box 20 is used for communicating with the heat exchange tube bundle 12. To effectively isolate bypass tube bundle 11 from heat exchange tube bundle 12, valve seat cylinder 311 is sized to have a diameter that ensures that the outlet of bypass tube bundle 11 is completely inside valve seat cylinder 311 and the outlet of heat exchange tube bundle 12 is completely outside valve seat cylinder 311. That is, the diameter of the valve seat cylinder 311 is determined by the diameter of the bypass tube bundle 11.

The annular baffle 32 is for being provided to the rear smoke box 20, is fixed to a side wall of the rear smoke box 20 by, for example, bolts, and is spaced from the valve seat 31 in the axial direction and the radial direction of the regulating valve 30. The annular baffle 32 is preferably arranged coaxially with the valve seat 31.

The spool 33 is movably disposed between an annular valve seat plate 312 and an annular flapper 32 in a valve seat cylinder 311.

A bypass pipe process gas flow passage is formed between the annular valve seat plate 312 and the valve core 33, and the high-temperature bypass pipe process gas flowing out of the bypass pipe bundle 11 enters the valve seat cylinder 311 and enters the rear smoke box 20 through the bypass pipe process gas flow passage. A flow channel of heat exchange tube process gas is formed between the annular baffle 32 and the valve core 33, and the heat exchange tube process gas flowing out of the heat exchange tube bundle 12 enters an annular space between the valve seat cylinder 311 and the rear smoke box 20 and enters the rear smoke box 20 through the flow channel of the heat exchange tube process gas. The high temperature by-pass pipe process gas and the low temperature heat exchange pipe process gas are mixed in the back smoke box 20 to form the synthesis process gas. According to the temperature requirement of the subsequent process on the synthesis process gas, the size of the by-pass pipe process gas flow channel and the size of the heat exchange pipe process gas flow channel can be adjusted by adjusting the position of the regulating valve 30 core between the annular valve seat plate 312 and the annular baffle 32, so that the flow rates of the high-temperature by-pass pipe process gas and the low-temperature heat exchange pipe process gas are adjusted, and the temperature of the synthesis process gas meets the requirement of the subsequent process.

In order to ensure the normal operation of the subsequent process and improve the safety of the equipment, the valve core 33 of the regulating valve 30 should be designed to quickly and effectively improve the mixing uniformity of the synthesis process gas so as to improve the temperature consistency of the synthesis process gas.

Specifically, referring to fig. 1, 2, and 4, the spool 33 includes a spool inner cylinder 331, a spool outer cylinder 332, a first spool plate 333, and swirl vanes. The valve core outer cylinder 332 is arranged outside the valve core inner cylinder 331, and a flow channel of bypass pipe process gas is formed among the valve core outer cylinder 332, the valve core inner cylinder 331 and the annular valve seat plate 312. The first spool plate 333 is provided at one end of the spool outer cylinder 332 near the ring baffle 32 in the radial direction of the regulator valve 30. The first spool plate 333 is configured in a ring shape, and the inner circumferential wall of the first spool plate 333 is connected to the spool outer cylinder 332 by welding. A flow passage for the heat exchange tube process gas is formed between the first valve core plate 333 and the annular baffle 32. The swirl vanes are provided at the spool inner cylinder 331 and/or the first spool plate 333. That is to say, the swirl vanes are arranged in the flow channel of the bypass pipe process gas and/or the flow channel of the heat exchange pipe process gas.

According to the above scheme, the swirl vanes are arranged at the valve core inner cylinder 331 and/or the first valve core plate 333, so that the regulating valve 30 has a swirl channel, and further the bypass pipe process gas flowing through the valve core inner cylinder 331 and/or the heat exchange pipe process gas flowing through the first valve core plate 333 are/is rotated when flowing through the swirl channel, so that intensive mixing occurs after the regulating valve 30, the mixing uniformity of the synthesis process gas is rapidly and effectively improved, and the temperature uniformity of the synthesis process gas is improved.

Further, referring to fig. 2 to 4, the swirl vane includes a plurality of first swirl vanes 334, and the plurality of first swirl vanes 334 are provided at intervals in the circumferential direction of the first spool plate 333 on a side of the first spool plate 333 adjacent to the ring baffle 32. A first rotational flow channel is formed among the first valve core plate 333, the annular baffle 32 and the plurality of first rotational flow blades 334, the low-temperature heat exchange tube process gas flowing out of the heat exchange tube bundle 12 rotates when flowing through the first rotational flow channel, and enters the rear smoke box 20 to be strongly mixed with the high-temperature bypass tube process gas, so that the mixing uniformity of the synthesis process gas is rapidly improved, and the phenomenon of local over-temperature of the rear smoke box 20 caused by uneven mixing is effectively avoided. The normal operation of the subsequent process is ensured, and the safety of the equipment is improved.

Preferably, referring to fig. 3, the plurality of first swirl vanes 334 are disposed perpendicularly with respect to a radial cross section of the spool 33, and are disposed obliquely with respect to a radial direction of the first spool plate 333. By adjusting the extending direction of the first swirl vanes 334 in the radial direction of the first valve core plate 333, and/or adjusting the shape of the first swirl vanes 334, the shape of the first swirl channels can be adjusted to change the rotating direction and rotating speed of the heat exchange tube process gas flowing through the first swirl channels, so as to improve the mixing uniformity of the synthesis process gas.

Further, referring to fig. 2 to 4, the swirl vanes further include a plurality of second swirl vanes 335, and the plurality of second swirl vanes 335 are disposed between the spool inner cylinder 331 and the spool outer cylinder 332 at intervals in a circumferential direction of the spool inner cylinder 331. Both ends of the second swirl vane 335 are preferably welded to the outer wall of the valve core inner cylinder 331 and the inner wall of the valve core outer cylinder 332, respectively. Annular second rotational flow channels are formed among the valve core inner cylinder 331, the valve core outer cylinder 332 and the plurality of second rotational flow blades 335, high-temperature bypass pipe process gas flowing out of the bypass pipe bundle 11 rotates when flowing through the second rotational flow channels and enters the rear smoke box 20 to be strongly mixed with low-temperature heat exchange pipe process gas, the mixing uniformity of synthetic process gas is rapidly improved, and the phenomenon that the rear smoke box 20 is locally over-heated due to uneven mixing is effectively avoided. And the rotation of the high-temperature bypass pipe process gas reduces the rigidity of the air flow, the jet flow length of the high-temperature bypass pipe process gas and the synthetic process gas is shortened, the direct impact strength of the high-temperature bypass pipe process gas and the synthetic process gas on the rear smoke box 20 can be effectively reduced, the risk of local overtemperature of the rear smoke box 20 is further reduced, and the safety of equipment is improved.

Preferably, referring to fig. 3, a plurality of second swirl vanes 335 are obliquely arranged with respect to a radial section of the spool 33. By adjusting the angle at which the second swirl vanes 335 are inclined with respect to the radial cross-section of the spool 33, and/or adjusting the shape of the second swirl vanes 335, the shape of the second swirl passage can be adjusted to change the rotational direction and rotational speed of the bypass process gas flowing through the second swirl passage in order to improve the mixing uniformity of the synthesis process gas.

Preferably, the first swirl vanes 334 and the second swirl vanes 335 are reasonably arranged, so that the rotating directions of the low-temperature heat exchange tube process gas and the high-temperature bypass tube process gas are consistent, strong mixing is generated between the low-temperature heat exchange tube process gas and the high-temperature bypass tube process gas, and the mixing uniformity of the synthesis process gas is improved.

To further enhance the mixing uniformity of the synthesis process gas, enhance the controllability of the regulating valve 30, and reduce the manufacturing and installation difficulty and cost of the regulating valve 30, the plurality of first swirl vanes 334 and/or the plurality of second swirl vanes 335 are preferably uniformly spaced. Of course, a plurality of first swirl vanes 334 and/or a plurality of second swirl vanes 335 may be arranged according to actual needs, such that the plurality of first swirl vanes 334 and/or the plurality of second swirl vanes 335 are non-uniformly spaced or partially uniformly disposed.

In adjusting the flow rates of the bypass line process gas and the heat exchange line process gas according to the temperature requirements of the synthesis process gas, that is, adjusting the position of the spool 33 between the annular valve seat plate 312 and the annular baffle 32 in the valve seat cylinder 311, for convenience of control, a second valve core plate 336 is provided at one end of the spool inner cylinder 331 adjacent to the annular valve seat plate 312, with particular reference to fig. 1. The second valve core plate 336 and the valve core inner cylinder 331 may be connected by welding. A bypass pipe process gas flow passage is formed between the second valve core plate 336 and the annular valve seat plate 312, and the size of the bypass pipe process gas flow passage can be controlled by controlling the distance between the second valve core plate 336 and the annular valve seat plate 312, thereby controlling the flow rate and flow velocity of the bypass pipe process gas entering the valve core 33.

To facilitate control of the movement of the spool 33 between the annular valve seat plate 312 and the annular baffle plate 32 to regulate the flow of the bypass line process gas and the heat exchange line process gas, a spool shaft 337 is provided within the spool inner cylinder 331, the spool shaft 337 being connected, such as by welding, to the second valve core plate 336. The spool shaft 337 is movable in the axial direction of the spool inner cylinder 331 to move the spool 33 along the seat cylinder 311, that is, to move the spool 33 between the annular valve seat plate 312 and the annular baffle 32. The spool 337 may be connected to an external drive mechanism to enable automatic regulation of flow rate via the drive mechanism according to the load of the waste heat boiler and the temperature requirements of the synthesis process gas.

When the load of the waste heat boiler is increased, the valve core shaft 337 drives the valve core 33 to move towards the annular valve seat plate 312, at this time, the flow passage of the bypass pipe process gas between the second valve core plate 336 and the annular valve seat plate 312 is reduced, and the flow rate of the bypass pipe process gas is reduced; the flow channel of the heat exchange tube process gas between the first valve core plate 333 and the annular baffle 32 is increased, and the flow of the heat exchange tube process gas is increased, so that the temperature of the synthesis process gas meets the requirement. When the load of the waste heat boiler is reduced, the valve core shaft 337 drives the valve core 33 to move in the direction away from the annular valve seat plate 312, so as to increase the flow of the bypass pipe process gas, reduce the flow of the heat exchange pipe process gas, and enable the temperature of the synthesis process gas to meet the requirement.

Preferably, with continued reference to fig. 2, the spool 33 further includes a plurality of fixing plates 338, the plurality of fixing plates 338 being disposed at intervals within the spool inner cylinder 331 for fixing the spool inner cylinder 331 and the spool shaft 337 to enhance the connection between the spool shaft 337 and the spool 33. Both ends of the fixing plate 338 are preferably welded to the inner wall of the spool inner cylinder 331 and the outer surface of the spool shaft 337, respectively.

In the illustrated embodiment, the fixing plates 338 are 4 in number and are arranged in evenly spaced relation. It is understood that the number, shape and arrangement of the fixing plates 338 can be set according to actual requirements as long as the connection between the spool shaft 337 and the spool inner cylinder 331 can be enhanced.

Further, the regulating valve 30 further comprises a limiting member, so that the valve core 33 is driven by the valve core shaft 337 to move along the valve seat cylinder 311 between the first open position and the second open position, so as to avoid that the flow passage of the heat exchange tube process gas and/or the flow passage of the bypass tube process are completely closed or the flow passage of the heat exchange tube process gas and/or the flow passage of the bypass tube process are too small during the flow regulation of the regulating valve 30, which results in too high or too low temperature of the synthesis process gas.

Specifically, referring to fig. 1, the regulator valve 30 includes a first stopper 321, the first stopper 321 is disposed on a side of the ring baffle 32 close to the first spool plate 333, and when the spool 33 is located at the first open position, the first spool plate 333 abuts against the first stopper 321. The gap between the first valve core plate 333, the first limiting member 321 and the ring baffle 32 can form the minimum flow channel of the heat exchange tube process gas, that is, when the valve core 33 is located at the first open position, the flow channel opening degree of the heat exchange tube process gas is minimum, and the flow rate of the heat exchange tube process gas is minimum. Through process calculation, the first limiting member 321 is set such that the temperature rise value of the synthesis process gas is within the process requirement allowable range when the valve element 33 is located at the first open position. That is, the first limiting member 321 is set to ensure that the temperature rise value of the synthesis process gas is within the allowable range of the process requirement under any load within the design range of the load of the waste heat boiler. Thus, under the conditions that the driving mechanism of the regulating valve 30 is in failure, the manual regulation is in error, or the load sudden change of the waste heat boiler is caused by the untimely action of the regulating valve 30, and the like, the temperature rise value of the synthesis process gas in the rear smoke box 20 does not exceed the range of the equipment safety range and the range of the process requirement, so that the normal operation of the subsequent process and the safety of the equipment are ensured.

Preferably, the first stoppers 321 may be configured as first stoppers distributed along the circumferential direction of the ring baffle 32. The first limiting member 321 may be configured in other structures as required, as long as the flow rate of the heat exchange tube process gas is such that the temperature increase value of the synthesis process gas is within the process requirement allowable range when the valve core 33 is located at the first open position.

Further, referring to fig. 1, the valve seat 31 includes a second retaining member 313, the second retaining member 313 is disposed on a side of the annular valve seat plate 312 close to the valve core 33, and when the valve core 33 is located at the second open position, the second valve core plate 336 abuts against the second retaining member 313. The gap between the second valve core plate 336, the second retainer 313 and the annular valve seat plate 312 may form a minimum flow path for the bypass line process gas, that is, when the valve core 33 is located at the second open position, the flow path opening of the bypass line process gas is minimum and the flow rate of the bypass line process gas is minimum. Through process calculation, the second position-limiting member 313 is set such that the temperature reduction value of the synthesis process gas is within the allowable range of the process requirement when the valve element 33 is located at the second open position. That is, the second position-limiting member 313 is set to ensure that the temperature reduction value of the synthesis process gas is within the allowable range of the process requirement at any load within the design range of the load of the waste heat boiler. Thus, under the conditions that the driving mechanism of the regulating valve 30 is failed, the manual regulation is failed, or the load sudden change of the waste heat boiler is caused by the untimely action of the regulating valve 30, and the like, the temperature reduction value of the synthetic process gas in the rear smoke box 20 does not exceed the range of the process requirement, so that the normal operation of the subsequent process is ensured.

Preferably, the second stopper 313 may be configured as a second stopper distributed along the circumferential direction of the annular valve seat plate 312. The second position-limiting member 313 may be configured in other forms as required, as long as the flow rate of the bypass pipe process gas is such that the temperature reduction value of the synthesis process gas is within the process requirement allowable range when the valve core 33 is located at the second open position.

Further, in order to reduce the flow resistance of the by-pass pipe process gas within the valve seat cylinder 311 and to reduce the dead zone of the flow of the by-pass pipe process gas between the valve seat cylinder 311 and the annular valve seat plate 312, a flow guide 314 is preferably provided within the valve seat cylinder 311, with particular reference to fig. 1 and 5. One end of the guide member 314 is connected to the inner wall of the valve seat cylinder 311, and the other end of the guide member 314 is connected to the inner circumferential wall of the annular valve seat plate 312. The baffle 314 is preferably configured as a conical cylinder to minimize the flow resistance of the by-pass line process gas within the valve seat cylinder 311.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a governing valve for shell and tube type waste heat boiler, shell and tube type waste heat boiler includes tube sheet and back smoke box, the tube sheet includes the back tube sheet, the roughly central point of tube sheet puts and is provided with bypass tube bank, be provided with heat exchanger tube bank around the tube sheet, the governing valve sets up in the back smoke box, and with back tube sheet connects, its characterized in that, the governing valve includes:

a valve core inner cylinder;

2. The regulator valve according to claim 1, wherein the swirl vane comprises a plurality of first swirl vanes disposed at intervals along a circumferential direction of the first spool plate on a side of the first spool plate adjacent to the ring baffle.

3. The regulator valve according to claim 1, wherein the swirl vanes include a plurality of second swirl vanes disposed between the spool inner cylinder and the spool outer cylinder at intervals in a circumferential direction of the spool inner cylinder.

4. The regulator valve according to claim 1, wherein the valve cartridge further comprises a second valve core plate disposed at an end of the cartridge inner barrel proximate the annular valve seat plate.

5. The regulator valve according to claim 4, further comprising a spool shaft disposed within the spool inner barrel and coupled to the second valve core plate, the spool shaft being movable in an axial direction of the spool inner barrel to move the spool along the valve seat barrel between the first open position and the second open position.

6. The regulator valve according to claim 5, wherein a side of the annular baffle plate adjacent the first spool plate is provided with a first stop, and the first spool plate abuts against the first stop when the spool is in the first open position.

7. The regulator valve according to claim 5, wherein the valve seat further comprises a second stop member disposed on a side of the annular seat plate adjacent to the valve spool, the second core plate abutting the second stop member when the valve spool is in the second open position.

8. The regulator valve according to claim 1, wherein the valve seat further comprises a flow guide member, one end of the flow guide member is connected to an inner wall of the valve seat cylinder, and the other end of the flow guide member is connected to an inner circumferential wall of the annular valve seat plate.

9. The regulator valve according to claim 5, wherein the spool further comprises a plurality of fixing plates disposed at intervals within the spool inner cylinder for fixing the spool inner cylinder and the spool shaft.

10. The regulator valve of claim 3 wherein the plurality of second swirl vanes are disposed obliquely to a radial cross-section of the valve spool.

11. The regulator valve of claim 2, wherein the plurality of first swirl vanes are disposed at an incline relative to a radial direction of the first spool plate.