A regulating valve for shell and tube waste heat boiler

Abstract

The present invention discloses a regulating valve for a shell-and-tube waste heat boiler, comprising a valve seat, an annular baffle, and a valve core. The valve seat comprises a valve seat cylinder and an annular valve seat plate disposed within the valve seat cylinder. The interior space of the valve seat cylinder is configured to communicate with a bypass pipe bundle, and the space between the valve seat cylinder and a rear smoke box is configured to communicate with a heat exchange pipe bundle. The annular baffle is configured to be mounted to the rear smoke box and spaced from the valve seat in the axial and radial directions of the regulating valve. The valve core is movably disposed between the annular valve seat plate and the annular baffle and comprises a valve core inner cylinder, a valve core outer cylinder disposed outside the valve core inner cylinder, a first valve core plate disposed at one end of the valve core outer cylinder near the annular baffle in the radial direction of the regulating valve, and swirl vanes disposed on the valve core inner cylinder and / or the first valve core plate. The regulating valve according to the present invention causes the bypass pipe bundle process gas and / or the heat exchange pipe process gas to rotate as it flows through the swirl vanes, thereby quickly and effectively improving the mixing uniformity of the synthetic process gas.

Description

Technical Field

[0001] The present invention relates to the technical field of valve design, and in particular to a regulating valve for a shell and tube type waste heat boiler. Background Art

[0002] Shell-and-tube waste heat boilers (HRSGs) are widely used in the petrochemical industry due to their compact structure and ability to recover waste heat from high-temperature, high-pressure gas. They are also widely used in the coal-to-ammonia, methanol, and natural gas industries to recover waste heat from high-temperature, high-pressure process gas. The process gas flow rate entering a HRSG typically varies between 35% and 100%, with minimal fluctuation in inlet process gas temperature. Due to subsequent process requirements, the process gas temperature at the HRSG outlet must be maintained within a specific range. This type of HRSG typically consists of two tube bundles of different diameters: the larger diameter bundle serves as the bypass bundle, located in the center, and the smaller diameter bundles serve as the heat exchange bundles. The bypass bundle has a low heat transfer coefficient, resulting in a higher process gas outlet temperature; the heat exchange bundle has a high heat transfer coefficient, resulting in a lower process gas outlet temperature. By properly distributing and mixing the high-temperature and low-temperature process gases, the mixed process gas temperature at the HRSG outlet can meet process requirements.

[0003] The flow distribution of high-temperature and low-temperature process gases is typically controlled by regulating valves. However, currently used regulating valves cannot ensure uniform mixing of the high-temperature and low-temperature process gases. Uneven mixing of the process gases at the outlet of a shell-and-tube waste heat boiler (HRSG) can affect the normal operation of subsequent processes and potentially cause localized overheating of the equipment, significantly impacting equipment safety.

[0004] Furthermore, currently used control valves can completely close the high-temperature process gas flow path in the bypass tube bundle and the low-temperature process gas flow path in the heat exchange tube bundle. In the event of unexpected operating conditions, such as a malfunction in the control valve's external drive mechanism, a manual adjustment error, or a sudden load change in the shell-and-tube waste heat boiler that leaves the control valve unable to activate in time, the mixed process gas temperature can become too high or too low, failing to meet process requirements and compromising equipment safety.

[0005] 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. Summary of the Invention

[0006] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] In order to at least partially solve the above-mentioned problems, the present invention provides a regulating valve for a shell and tube type waste heat boiler. The shell and tube type waste heat boiler comprises a tube sheet and a rear smoke box. The tube sheet comprises a rear tube sheet. A bypass tube bundle is provided at a substantially central position of the tube sheet. Heat exchange tube bundles are provided around the tube sheet. The regulating valve is provided in the rear smoke box and connected to the rear tube sheet. The regulating valve comprises:

[0008] A valve seat, the valve seat comprising a valve seat cylinder and an annular valve seat plate disposed within the valve seat cylinder, the valve seat cylinder being configured to be connected to the rear tube sheet, the interior space of the valve seat cylinder being configured to communicate with the bypass tube bundle, and the space between the valve seat cylinder and the rear smoke box being configured to communicate with the heat exchange tube bundle;

[0009] an annular baffle, the annular baffle being used to be provided to the rear smoke box and spaced apart from the valve seat along the axial direction and the radial direction of the regulating valve;

[0010] A valve core is movably arranged between the annular valve seat plate and the annular baffle, and the valve core includes:

[0011] Valve core inner tube;

[0012] A valve core outer cylinder, the valve core outer cylinder being arranged outside the valve core inner cylinder;

[0013] a first valve core plate, the first valve core plate being annular in structure and being disposed on one end of the valve core outer cylinder close to the annular baffle in a radial direction of the regulating valve; and

[0014] The swirl blades are arranged on the valve core inner cylinder and / or the first valve core plate.

[0015] The regulating valve according to the present invention is provided with swirl vanes on the valve core inner barrel and / or the first valve core plate, thereby providing the regulating valve with a swirl channel. This, in turn, causes the bypass pipe bundle process gas flowing through the valve core inner barrel and / or the heat exchange pipe process gas flowing through the first valve core plate to rotate as it flows through the swirl channel, resulting in intense mixing after the regulating valve. This quickly and effectively improves the mixing uniformity of the synthetic process gas, ensuring the normal operation of subsequent processes and greatly enhancing the safety of the equipment. Furthermore, because the rotation of the synthetic process gas reduces the stiffness of the airflow and shortens the length of the airflow jet, it can effectively reduce the direct impact of the synthetic process gas on the equipment, further enhancing the safety of the equipment.

[0016] Optionally, the swirl blades include a plurality of first swirl blades, and the plurality of first swirl blades are arranged at intervals along the circumference of the first valve core plate on a side of the first valve core plate close to the annular baffle.

[0017] Optionally, the swirl blades include a plurality of second swirl blades, and the plurality of second swirl blades are arranged between the valve core inner tube and the valve core outer tube at intervals along the circumferential direction of the valve core inner tube.

[0018] Optionally, the valve core further includes a second valve core plate, which is arranged at one end of the valve core inner tube close to the annular valve seat plate.

[0019] Optionally, the regulating valve also includes a valve core shaft, which is arranged in the valve core inner tube and connected to the second valve core plate. The valve core shaft is movable along the axial direction of the valve core inner tube to drive the valve core to move along the valve seat tube between the first open position and the second open position.

[0020] Optionally, a first position-limiting member is provided on a side of the annular baffle 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 position-limiting member.

[0021] Optionally, the valve seat further includes a second limiting member, which is arranged on a side of the annular valve seat plate close to the valve core. When the valve core is located in the second open position, the second valve core plate abuts against the second limiting member.

[0022] Optionally, the valve seat further includes a flow guide, one end of which is connected to the inner wall of the valve seat cylinder, and the other end of which is connected to the inner circumferential wall of the annular valve seat plate.

[0023] Optionally, the valve core further includes a plurality of fixing plates, which are arranged at intervals in the valve core inner tube and are used to fix the valve core inner tube and the valve core shaft.

[0024] Optionally, the plurality of second swirl blades are arranged to be inclined relative to a radial cross section of the valve core.

[0025] Optionally, the plurality of first swirl blades are arranged to be inclined relative to the radial direction of the first valve core plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings of the present invention are incorporated herein as part of the present invention for understanding the present invention. The drawings show embodiments of the present invention and the description thereof is used to explain the principle of the present invention.

[0027] In the attached figure:

[0028] Figure 1 A partial cross-sectional view of a regulating valve according to a preferred embodiment of the present invention installed on a shell and tube waste heat boiler;

[0029] Figure 2A schematic diagram of the three-dimensional structure of a valve core of a regulating valve according to a preferred embodiment of the present invention;

[0030] Figure 3 This is a front view structural diagram of a valve core of a regulating valve according to a preferred embodiment of the present invention;

[0031] Figure 4 is a schematic axial cross-sectional view of a valve core of a regulating valve according to a preferred embodiment of the present invention; and

[0032] Figure 5 Schematic diagram of an axial cross-section of a valve seat of a regulating valve according to a preferred embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 10: Rear tube sheet 11: Bypass tube bundle

[0035] 12: Heat exchange tube bundle 20: Rear smoke box

[0036] 30: Control valve 31: Valve seat

[0037] 311: Valve seat cylinder 312: Annular valve seat plate

[0038] 313: Second limiting member 314: Flow guide member

[0039] 32: annular baffle 321: first limiting member

[0040] 33: Valve core 331: Valve core inner tube

[0041] 332: Valve core outer tube 333: First valve core plate

[0042] 334: First swirl blade 335: Second swirl blade

[0043] 336: Second valve core plate 337: Valve core shaft

[0044] 338: Fixed plate DETAILED DESCRIPTION

[0045] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with embodiments of the present invention.

[0046] In order to thoroughly understand the embodiments of the present invention, a detailed structure will be presented in the following description. Obviously, 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 the ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0047] refer to Figure 1 , a preferred embodiment of the regulating valve 30 for a shell and tube waste heat boiler of the present invention is described. For simplicity, Figure 1 Only a partial structural diagram of the regulating valve 30 installed on the shell and tube waste heat boiler is schematically shown.

[0048] The shell and tube waste heat boiler includes a tube sheet, a smoke box, and a regulating valve 30. The tube sheet includes 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 is connected to the rear tube sheet 10. A bypass tube bundle 11 is disposed approximately in the center of the tube sheet, and a heat exchange tube bundle 12 is disposed around the tube sheet. In other words, the ends of the bypass tube bundle 11 and the heat exchange tube bundle 12 are connected to the front tube sheet 10 and the rear tube sheet 10, respectively. The bypass tube bundle 11 is disposed approximately in the center of the front tube sheet 10 and the rear tube sheet 10, and the heat exchange tube bundle 12 is disposed around the front tube sheet 10 and the rear tube sheet 10, that is, the heat exchange tube bundle 12 is disposed around the bypass tube bundle 11, and the diameter of the bypass tube bundle 11 is larger than the diameter of the heat exchange tube bundle 12.

[0049] The process gas entering the shell-and-tube waste heat boiler is split into two streams: one stream flows into the heat exchange tube bundle 12, known as the heat exchange tube process gas, and flows out of the heat exchange tube bundle 12 after heat exchange; the other stream flows into the bypass tube bundle 11, known as the bypass process gas, and flows out of the bypass tube bundle 11 after heat exchange. Because the heat transfer coefficient of bypass tube bundle 11 is lower than that of heat exchange tube bundle 12, the temperature of the bypass process gas at the outlet of bypass tube bundle 11 is higher than that of the heat exchange tube process gas at the outlet of heat exchange tube bundle 12. After flow regulation and distribution by regulating valve 30, the high-temperature bypass process gas and the low-temperature heat exchange tube process gas enter the rear smoke box 20 for mixing, forming a combined process gas at a predetermined temperature, which meets the process temperature requirements for subsequent processes.

[0050] Specifically, the regulating valve 30 includes a valve seat 31 , an annular baffle 32 and a valve core 33 .

[0051] The valve seat 31 includes a valve seat cylinder 311 and an annular valve seat plate 312 disposed within the valve seat cylinder 311. The valve seat cylinder 311 is used to connect to the rear tube sheet 10, for example, by welding. The valve seat cylinder 311 is preferably installed coaxially with the waste heat boiler. The internal space of the valve seat cylinder 311 is used to communicate with the bypass tube bundle 11, and the space between the valve seat cylinder 311 and the rear smoke box 20 is used to communicate with the heat exchange tube bundle 12. In order to effectively isolate the bypass tube bundle 11 from the heat exchange tube bundle 12, the diameter of the valve seat cylinder 311 should ensure that the outlet of the bypass tube bundle 11 is completely located within the valve seat cylinder 311, while the outlet of the heat exchange tube bundle 12 is completely located outside the valve seat cylinder 311. In other words, the diameter of the valve seat cylinder 311 depends on the diameter of the bypass tube bundle 11.

[0052] The annular baffle 32 is used to be provided to the rear smoke box 20, for example, fixed to the side wall of the rear smoke box 20 by bolts, and is spaced apart from the valve seat 31 in the axial direction and radial direction of the regulating valve 30. The annular baffle 32 is preferably provided coaxially with the valve seat 31.

[0053] The valve core 33 is movably disposed between the annular valve seat plate 312 and the annular baffle 32 in the valve seat cylinder 311 .

[0054] A flow channel for the bypass process gas is formed between the annular valve seat plate 312 and the valve core 33. The high-temperature bypass process gas flowing out of the bypass tube bundle 11 enters the valve seat cylinder 311 and then flows through the bypass process gas flow channel into the rear smoke box 20. A flow channel for the heat exchange tube process gas is formed between the annular baffle plate 32 and the valve core 33. The heat exchange tube process gas flowing out of the heat exchange tube bundle 12 enters the annular space between the valve seat cylinder 311 and the rear smoke box 20 and then flows through the heat exchange tube process gas flow channel into the rear smoke box 20. The high-temperature bypass process gas and the low-temperature heat exchange tube process gas are mixed in the rear smoke box 20 to form a combined process gas. By adjusting the position of the valve core 30 between the annular valve seat plate 312 and the annular baffle plate 32, the size of the bypass process gas flow channel and the heat exchange tube process gas flow channel can be adjusted according to the temperature requirements of the combined process gas in subsequent processes. This, in turn, adjusts the flow rates of the high-temperature bypass process gas and the low-temperature heat exchange tube process gas to ensure that the combined process gas temperature meets the requirements of subsequent processes.

[0055] In order to ensure the normal operation of subsequent processes and improve the safety of the equipment, the design of the valve core 33 of the regulating valve 30 should be able to quickly and effectively improve the mixing uniformity of the synthetic process gas to improve the temperature consistency of the synthetic process gas.

[0056] Specifically, refer to Figure 1 、 Figure 2 and Figure 4The valve core 33 includes a valve core inner tube 331, a valve core outer tube 332, a first valve core plate 333, and swirl vanes. The valve core outer tube 332 is positioned outside the valve core inner tube 331, and a flow path for the bypass pipe process gas is formed between the valve core outer tube 332, the valve core inner tube 331, and the annular valve seat plate 312. The first valve core plate 333 is positioned radially along the regulating valve 30 at one end of the valve core outer tube 332, near the annular baffle 32. The first valve core plate 333 is annular in shape, and the inner circumferential wall of the first valve core plate 333 can be connected to the valve core outer tube 332 by welding. A flow path for the heat exchange pipe process gas is formed between the first valve core plate 333 and the annular baffle 32. The swirl vanes are positioned on the valve core inner tube 331 and / or the first valve core plate 333. In other words, the swirl vanes are positioned within the flow path for the bypass pipe process gas and / or the flow path for the heat exchange pipe process gas.

[0057] According to the above scheme, swirl blades are arranged at the valve core inner tube 331 and / or the first valve core plate 333, so that the regulating valve 30 has a swirl channel, and the bypass pipe process gas flowing through the valve core inner tube 331 and / or the heat exchange pipe process gas flowing through the first valve core plate 333 rotates when flowing through the swirl channel, so that strong mixing occurs after the regulating valve 30, quickly and effectively improving the mixing uniformity of the synthetic process gas and improving the temperature consistency of the synthetic process gas.

[0058] Further, refer to Figures 2 to 4 The swirl blades include a plurality of first swirl blades 334, which are spaced apart along the circumference of the first valve core plate 333 on one side of the first valve core plate 333 near the annular baffle 32. A first swirl channel is formed between the first valve core plate 333, the annular baffle 32, and the plurality of first swirl blades 334. The low-temperature heat exchange tube process gas exiting the heat exchange tube bundle 12 rotates as it flows through the first swirl channel and enters the rear smoke box 20, where it is intensely mixed with the high-temperature bypass pipe process gas. This rapidly improves the uniformity of the synthetic process gas mixing and effectively avoids local overheating of the rear smoke box 20 caused by uneven mixing. This ensures the normal operation of subsequent processes and improves equipment safety.

[0059] Preferably, reference Figure 3 The plurality of first swirl blades 334 are arranged perpendicularly to the radial cross-section of the valve core 33 and are arranged at an angle relative to the radial direction of the first valve core plate 333. By adjusting the radial extension direction of the first swirl blades 334 along the first valve core plate 333 and / or adjusting the shape of the first swirl blades 334, the shape of the first swirl channel can be adjusted to change the rotation direction and rotation speed of the process gas in the heat exchange tube passing through the first swirl channel, thereby improving the mixing uniformity of the synthesis process gas.

[0060] Further, refer to Figures 2 to 4The swirl blades also include a plurality of second swirl blades 335, which are spaced apart along the circumference of the valve core inner tube 331 between the valve core inner tube 331 and the valve core outer tube 332. The ends of the second swirl blades 335 are preferably welded to the outer wall of the valve core inner tube 331 and the inner wall of the valve core outer tube 332, respectively. An annular second swirl channel is formed between the valve core inner tube 331, the valve core outer tube 332, and the plurality of second swirl blades 335. The high-temperature bypass pipe process gas flowing out of the bypass pipe bundle 11 rotates as it flows through the second swirl channel and enters the rear smoke box 20, where it is strongly mixed with the low-temperature heat exchange pipe process gas, rapidly improving the uniformity of the synthetic process gas mixing and effectively avoiding the phenomenon of local overheating in the rear smoke box 20 caused by uneven mixing. In addition, the rotation of the high-temperature bypass pipe process gas reduces the stiffness of the airflow, and the jet length of the high-temperature bypass pipe process gas and the synthetic process gas becomes shorter, which can effectively reduce the direct impact of the high-temperature bypass pipe process gas and the synthetic process gas on the rear smoke box 20, further reduce the risk of local overheating of the rear smoke box 20, and improve the safety of the equipment.

[0061] Preferably, reference Figure 3 The plurality of second swirl blades 335 are arranged at an inclination relative to the radial cross-section of the valve core 33. By adjusting the inclination angle of the second swirl blades 335 relative to the radial cross-section of the valve core 33 and / or adjusting the shape of the second swirl blades 335, the shape of the second swirl channel can be adjusted to change the rotation direction and rotation speed of the bypass pipe process gas flowing through the second swirl channel, thereby improving the mixing uniformity of the synthesis process gas.

[0062] Preferably, by reasonably arranging the first swirl blade 334 and the second swirl blade 335, the rotation directions of the low-temperature heat exchange tube process gas and the high-temperature bypass tube process gas are made consistent, so that strong mixing occurs between the two, which is beneficial to improving the mixing uniformity of the synthetic process gas.

[0063] To further improve the mixing uniformity of the synthesis process gas, enhance the controllability of the regulating valve 30, and reduce the difficulty and cost of manufacturing and installing the regulating valve 30, the multiple first swirl blades 334 and / or the multiple second swirl blades 335 are preferably arranged at even intervals. Of course, the multiple first swirl blades 334 and / or the multiple second swirl blades 335 can also be arranged according to actual needs, so that the multiple first swirl blades 334 and / or the multiple second swirl blades 335 are arranged at uneven intervals or are arranged partially evenly.

[0064] When the flow rates of the process gas in the bypass pipe and the process gas in the heat exchange pipe are adjusted according to the temperature requirements of the synthesis process gas, that is, when the position of the valve core 33 between the annular valve seat plate 312 and the annular baffle 32 in the valve seat cylinder 311 is adjusted, a second valve core plate 336 is provided at one end of the valve core inner cylinder 331 close to the annular valve seat plate 312 for ease of control. Figure 1 The second valve core plate 336 and the valve core inner tube 331 can be connected by welding. A flow channel for the bypass process gas is formed between the second valve core plate 336 and the annular valve seat plate 312. By controlling the distance between the second valve core plate 336 and the annular valve seat plate 312, the size of the bypass process gas flow channel can be controlled, thereby controlling the flow rate and flow rate of the bypass process gas entering the valve core 33.

[0065] To facilitate the movement of the valve core 33 between the annular valve seat plate 312 and the annular baffle plate 32, thereby regulating the flow of process gas in the bypass pipe and the heat exchange pipe, a valve core shaft 337 is disposed within the valve core inner barrel 331. The valve core shaft 337 is connected to the second valve core plate 336, for example, by welding. The valve core shaft 337 is movable axially along the valve core inner barrel 331, thereby driving the valve core 33 along the valve seat barrel 311, that is, between the annular valve seat plate 312 and the annular baffle plate 32. The valve core shaft 337 can be connected to an external drive mechanism to automatically adjust the flow rate based on the waste heat boiler load and the required temperature of the synthesis process gas.

[0066] When the waste heat boiler load increases, the valve core shaft 337 drives the valve core 33 toward the annular valve seat plate 312. This reduces the bypass pipe process gas flow path between the second valve core plate 336 and the annular valve seat plate 312, reducing the bypass pipe process gas flow rate. The heat exchange pipe process gas flow path between the first valve core plate 333 and the annular baffle 32 increases, increasing the heat exchange pipe process gas flow rate, ensuring that the synthetic process gas temperature meets the required level. When the waste heat boiler load decreases, the valve core shaft 337 drives the valve core 33 away from the annular valve seat plate 312, increasing the bypass pipe process gas flow rate and reducing the heat exchange pipe process gas flow rate, ensuring that the synthetic process gas temperature meets the required level.

[0067] Preferably, continue to refer to Figure 2 The valve core 33 further includes a plurality of fixing plates 338, which are disposed at intervals within the valve core inner tube 331 and are used to fix the valve core inner tube 331 and the valve core shaft 337, thereby strengthening the connection between the valve core shaft 337 and the valve core 33. The ends of the fixing plates 338 are preferably welded to the inner wall of the valve core inner tube 331 and the outer surface of the valve core shaft 337, respectively.

[0068] In the illustrated embodiment, there are four fixing plates 338 , which are evenly spaced. It is understood that the number, shape, and arrangement of the fixing plates 338 can be adjusted based on actual needs, as long as the connection between the valve core shaft 337 and the valve core inner tube 331 is strengthened.

[0069] Furthermore, the regulating valve 30 also includes a limit member, so that the valve core 33 moves between the first open position and the second open position along the valve seat tube 311 under the drive of the valve core shaft 337, so as to avoid the flow channel of the heat exchange tube process gas and / or the flow channel of the bypass pipe process being completely closed during the flow regulation of the regulating valve 30, or the flow channel of the heat exchange tube process gas and / or the flow channel of the bypass pipe process being too small, thereby causing the temperature of the synthetic process gas to be too high or too low.

[0070] Specifically, refer to Figure 1 The regulating valve 30 includes a first stopper 321, which is positioned on a side of the annular baffle 32 near the first valve core plate 333. When the valve core 33 is in the first open position, the first valve core plate 333 abuts the first stopper 321. The gap between the first valve core plate 333, the first stopper 321, and the annular baffle 32 forms a minimum flow path for the process gas in the heat exchange tube. That is, when the valve core 33 is in the first open position, the flow path for the process gas in the heat exchange tube is at its minimum opening, and the flow rate of the process gas in the heat exchange tube is at its minimum. Process calculations have shown that the first stopper 321 should be positioned such that when the valve core 33 is in the first open position, the temperature rise of the synthesis process gas is within the permissible range of process requirements. In other words, the first stopper 321 should be positioned to ensure that the temperature rise of the synthesis process gas is within the permissible range of process requirements at any load within the design load range of the waste heat boiler. In this way, when the driving mechanism of the control valve 30 fails, manual adjustment is wrong, or the load of the waste heat boiler suddenly changes and the control valve 30 fails to operate in time, the temperature increase of the synthetic process gas in the rear smoke box 20 will not exceed the equipment safety range and the process requirements, so as to ensure the normal progress of subsequent processes and the safety of the equipment.

[0071] Preferably, the first stopper 321 can be configured as a first stopper block distributed along the circumference of the annular baffle 32. The first stopper 321 can also be configured as other structural forms as needed, as long as the flow rate of the process gas in the heat exchange tube when the valve core 33 is in the first open position ensures that the temperature rise of the synthesis process gas is within the allowable range of process requirements.

[0072] Further, refer to Figure 1The valve seat 31 includes a second stopper 313, which is arranged on the side of the annular valve seat plate 312 near the valve core 33. When the valve core 33 is in the second open position, the second valve core plate 336 abuts the second stopper 313. The gap between the second valve core plate 336, the second stopper 313, and the annular valve seat plate 312 can form a minimum flow channel for the bypass pipe process gas. In other words, when the valve core 33 is in the second open position, the flow channel opening of the bypass pipe process gas is minimized, and the flow rate of the bypass pipe process gas is minimized. Through process calculations, the second stopper 313 should be set so that when the valve core 33 is in the second open position, the temperature drop of the synthetic process gas is within the allowable range of process requirements. In other words, the second stopper 313 should be set to ensure that the temperature drop of the synthetic process gas is within the allowable range of process requirements at any load within the load design range of the waste heat boiler. In this way, when the driving mechanism of the regulating valve 30 fails, manual adjustment is wrong, or the load of the waste heat boiler suddenly changes and the regulating valve 30 does not operate in time, the temperature drop of the synthetic process gas in the rear smoke box 20 will not exceed the range required by the process, so as to ensure the normal progress of subsequent processes.

[0073] Preferably, the second stopper 313 can be configured as a second stopper block distributed along the circumference of the annular valve seat plate 312. The second stopper 313 can also be configured in other structural forms as needed, as long as the flow rate of the process gas in the bypass pipe when the valve core 33 is in the second open position ensures that the temperature drop of the synthesis process gas is within the allowable range of process requirements.

[0074] In addition, in order to reduce the flow resistance of the bypass pipe process gas in the valve seat cylinder 311 and reduce the flow dead zone of the bypass pipe process gas between the valve seat cylinder 311 and the annular valve seat plate 312, a flow guide 314 is preferably provided in the valve seat cylinder 311. Figure 1 and Figure 5 One end of the flow guide 314 is connected to the inner wall of the valve seat cylinder 311, and the other end of the flow guide 314 is connected to the inner circumferential wall of the annular valve seat plate 312. The flow guide 314 is preferably configured as a conical cylinder to minimize the flow resistance of the bypass pipe process gas in the valve seat cylinder 311.

[0075] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate component. Features described in this article in one embodiment can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0076] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will appreciate that various variations and modifications may be made based on the teachings of the present invention, and such variations and modifications fall within the scope of protection claimed in the present invention.

Claims

1. A regulating valve for a shell and tube type waste heat boiler, the shell and tube type waste heat boiler comprising a tube sheet and a rear smoke box, the tube sheet comprising a rear tube sheet, a bypass tube bundle being disposed substantially at the center of the tube sheet, a heat exchange tube bundle being disposed around the tube sheet, the regulating valve being disposed within the rear smoke box and connected to the rear tube sheet, characterized in that: The regulating valve comprises: A valve seat, the valve seat comprising a valve seat cylinder and an annular valve seat plate disposed within the valve seat cylinder, the valve seat cylinder being configured to be connected to the rear tube sheet, the interior space of the valve seat cylinder being configured to communicate with the bypass tube bundle, and the space between the valve seat cylinder and the rear smoke box being configured to communicate with the heat exchange tube bundle; an annular baffle, the annular baffle being used to be provided to the rear smoke box and spaced apart from the valve seat along the axial direction and the radial direction of the regulating valve; A valve core is movably arranged between the annular valve seat plate and the annular baffle, and the valve core includes: Valve core inner tube; A valve core outer cylinder, the valve core outer cylinder being arranged outside the valve core inner cylinder; a first valve core plate, the first valve core plate being annular in structure and being disposed on one end of the valve core outer cylinder close to the annular baffle in a radial direction of the regulating valve; and a swirl blade, the swirl blade being arranged on the valve core inner cylinder and / or the first valve core plate; wherein the swirl blades include a plurality of first swirl blades, and the plurality of first swirl blades are arranged at intervals along the circumference of the first valve core plate on a side of the first valve core plate close to the annular baffle; and In which, the swirl blades also include a plurality of second swirl blades, which are arranged at intervals along the circumference of the valve core inner tube between the valve core inner tube and the valve core outer tube to form an annular second swirl channel between the valve core inner tube, the valve core outer tube and the plurality of second swirl blades.

2. The regulating valve according to claim 1, characterized in that: The valve core further includes a second valve core plate, which is arranged at one end of the valve core inner tube close to the annular valve seat plate.

3. The regulating valve according to claim 2, characterized in that: The regulating valve also includes a valve core shaft, which is arranged in the valve core inner tube and connected to the second valve core plate. The valve core shaft is movable along the axial direction of the valve core inner tube to drive the valve core to move along the valve seat tube between the first open position and the second open position.

4. The regulating valve according to claim 3, characterized in that: A first position-limiting member is provided on one side of the annular baffle close to the first valve core plate. When the valve core is located at the first open position, the first valve core plate abuts against the first position-limiting member.

5. The regulating valve according to claim 3, characterized in that: The valve seat further includes a second position-limiting member, which is arranged on a side of the annular valve seat plate close to the valve core. When the valve core is located at the second open position, the second valve core plate abuts against the second position-limiting member.

6. The regulating valve according to any one of claims 1 to 5, characterized in that: The valve seat further comprises a flow guide, one end of which is connected to the inner wall of the valve seat cylinder, and the other end of which is connected to the inner circumferential wall of the annular valve seat plate.

7. The regulating valve according to any one of claims 3 to 5, characterized in that: The valve core further includes a plurality of fixing plates, which are arranged at intervals in the valve core inner tube and are used to fix the valve core inner tube and the valve core shaft.

8. The regulating valve according to any one of claims 1 to 5, characterized in that: The plurality of second swirl blades are arranged obliquely relative to a radial cross section of the valve core.

9. The regulating valve according to any one of claims 1 to 5, characterized in that: The plurality of first swirl blades are arranged to be inclined relative to the radial direction of the first valve core plate.

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