An integrated pressure and temperature reducer

Abstract

The application relates to an integrated temperature and pressure reducer, which comprises a valve body, an upper valve cover, a lower valve cover, a lower flange, an upper sleeve, a lower sleeve, a pressure reduction sleeve, a nozzle, a valve rod, a small valve core, a valve core gland, a large valve core and a valve seat. The scheme provided by the application is based on a pilot balanced structure, adopts a multistage pressure reduction principle, and can realize multistage pressure reduction of fluid by punching holes in the pressure reduction sleeve, the large valve core and the lower sleeve flow-through positions; the temperature of steam is reduced by the atomized temperature reducing water from the nozzle after pressure reduction, and the multistage pressure reduction integrated temperature and pressure reducer based on the pilot is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, in particular to an integrated temperature and pressure reducer. BACKGROUND

[0002] The temperature and pressure reducer is a kind of steam heat energy conversion device and energy-saving device for reheat utilization widely used in modern cogeneration and heat supply industry. In the temperature and pressure reducer industry, the split type temperature and pressure reducing device (steam pressure reducing valve + feedwater regulating valve + safety protection device) has the problems of unsatisfactory temperature and pressure reducing effect, high cost of secondary mixing device, excessive length of the whole device, unsatisfactory gas-liquid two-phase mixing effect, untimely response of temperature control loop, and large noise of downstream pipeline when used in steam medium with a steam pressure and temperature of 2.5 MPa / 400 DEG C or above. Therefore, it is a new challenge for the valve production and processing industry to develop a new temperature and pressure reducing device suitable for steam medium with a steam pressure and temperature of 2.5 MPa / 400 DEG C or above.

[0003] The present application relates to an integrated temperature and pressure reducer, which integrates steam temperature reduction and pressure reduction in the same device, so that the length of the whole device is greatly shortened, the device engineering land area is reduced, and the engineering investment is effectively reduced.

[0004] In addition, for high-temperature and high-pressure steam medium, only relying on single-stage pressure reduction and auxiliary noise reduction plate cannot effectively complete the important pressure reduction task. When the pressure after the valve is lower than the saturated steam pressure of the liquid medium, flashing occurs, which greatly damages the valve internals. At this time, a multi-stage pressure reducing valve core is needed. The multi-hole valve core of the present application can disperse the fluid into several small jets, the energy of each jet is offset by each other, the erosion damage to the valve internals is reduced, the noise of gas impact is reduced, the mixing effect with the temperature reducing water is enhanced, and the service life of the regulating valve is improved. For steam medium with fast flow rate and large volume, the unbalanced force and vibration during opening and closing of the valve are large, and the crawling and jamming phenomenon easily occurs. The present application provides an internal valve balancing structure, which can resist super-high temperature erosion through the setting of a pilot type balancing structure, the disc spring assembly can stabilize the valve internals, the multiple guide structures can reduce the vibration during opening and closing of the valve and the unbalanced force during opening and closing, so that the action is stable and easy to control. Based on the pressure reduction target, the resistance change of the through hole is simulated to affect the setting of the through hole size. SUMMARY

[0005] In view of the above problems, the present application is proposed to provide an integrated temperature and pressure reducer which overcomes the above problems or at least partially solves the above problems.

[0006] The valve body (8), the upper valve cover (21), the lower valve cover (4), the lower flange (1), the upper sleeve (14), the lower sleeve (7), the pressure reducing sleeve (10), the nozzle (6), the valve stem (18), the small valve core (13), the valve core gland (15), the large valve core (11), the valve seat (9);

[0007] The upper valve cover (21) is located above the valve body (8), the upper sleeve (14), the pressure reducing sleeve (10), and the valve seat (9) are installed in the upper part of the valve body (8), and the lower sleeve (7), the lower valve cover (4), and the lower flange (1) are installed in the lower part of the valve body (8).

[0008] Further, a plurality of sealing gaskets 24 are arranged at the connection between the valve body 8, the upper sleeve 14, and the valve seat 9.

[0009] Further, in the balance space (801), the flow direction of the fluid in the fluid passage sequentially passes through the upper part of the large valve core (11), the valve core (13), the valve core gland (15), the lower part of the valve stem (18), the upper sleeve (14), and the balance piston ring (23).

[0010] Further, a plurality of sealing gaskets 5 are arranged at the connection between the valve body 8, the lower sleeve 7, the lower valve cover 4, the lower flange 1, and the nozzle 6.

[0011] Further, the fluid in the fluid passage realizes the fluid pressure balance between the upper part of the large valve core (11) and the lower part of the large valve core (11) in the balance space (801), realizing the function of the pilot balanced structure.

[0012] Further, in the first buffer space (802), the flow direction of the fluid in the fluid passage sequentially passes through the pressure reducing sleeve (10), the outer side of the large valve core (11), and the lower part of the large valve core (11).

[0013] Further, through holes with gradually increasing sizes are arranged on the pressure reducing sleeve 10, the large valve core 11, and the lower sleeve 7.

[0014] Further, by punching holes at the flow positions of the pressure reducing sleeve, the large valve core, and the lower sleeve, the fluid can be multi-stage reduced in pressure.

[0015] Further, the temperature of the steam is reduced by the atomized temperature-reducing water from the nozzle after pressure reduction.

[0016] Further, temperature reduction is realized at the same time as pressure reduction.

[0017] The beneficial effects of the present invention specifically include: (1) Based on the pilot-type balance structure, the multi-stage pressure reduction principle is adopted. By drilling holes in the pressure reduction sleeve, the large valve core, and the flow position of the lower sleeve, the fluid can be depressurized in multiple stages. After pressure reduction, the temperature of the steam is reduced by the desuperheating water atomized from the nozzle, thus realizing the pilot-type multi-stage pressure reduction integrated desuperheating pressure reducer; (2) Based on the pressure reduction target, the resistance change of the continuously passing through the through hole is simulated and calculated to affect the setting of the through hole size. The through hole size is set from the pressure reduction effect itself.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. [Attached Image Description]

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an assembly structure diagram of the present invention;

[0021] Figure 2 This is a cross-sectional view of the pilot balancing section;

[0022] Figure 3 for Figure 1 A partial structural diagram;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Lower flange, 2-Bolt fastener, 3-Bolt fastener, 4-Lower valve cover, 5-Multiple sealing gaskets, 6-Nozzle, 7-Lower sleeve, 8-Valve body, 9-Valve seat, 10-Pressure reducing sleeve, 11-Large valve core, 12-Disc spring, 13-Small valve core, 14-Upper sleeve, 15-Valve core gland, 16-Bolt fastener, 17-Guide sleeve, 18-Valve stem, 19-Packaging, 20-Packaging fixing assembly, 21-Upper valve cover, 22-Set screw, 23-Balance piston ring, 24-Multiple sealing gaskets; 801-Balance space; 802-First buffer space; 803-Second buffer space.

Detailed Implementation Methods

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0026] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be thoroughly understood, and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0027] The terms "include" and "have" and any variations thereof in the specification, the claims and the accompanying drawings of the present disclosure are intended to cover the non-exclusive inclusion, for example, the inclusion of a series of steps or units.

[0028] The technical solutions of the present application will be described in further detail below in conjunction with the drawings and examples.

[0029] As Figures 1-3 The embodiment of the present application provides an integrated temperature and pressure reducer, which comprises a valve body 8, an upper valve cover 21, a lower valve cover 4, a lower flange 1, an upper sleeve 14, a lower sleeve 7, a pressure reducing sleeve 10, a nozzle 6, a valve rod 18, a small valve core 13, a valve core pressure cover 15, a large valve core 11 and a valve seat 9.

[0030] The upper valve cover 21 is located above the valve body 8, the upper sleeve 14, the pressure reducing sleeve 10 and the valve seat 9 are installed in the upper part of the valve body 8, and the lower sleeve 7, the lower valve cover 4 and the lower flange 1 are installed in the lower part of the valve body 8. The valve core assembly is composed of the valve rod 18, the small valve core 13, the large valve core 11 and the valve core pressure cover 15, and the parts are connected by threads. The large valve core 11 is a cavity with the opening downward. The valve rod 18 of the valve core assembly passes through the upper valve cover 21 and is located inside the upper sleeve 14. The nozzle 6 passes through the lower valve cover 4 and is located inside the lower sleeve 7. Among them, the upper part of the large valve core 11 forms a balance space 801 with the upper sleeve 14, the outer side of the large valve core 11 forms a first buffer space 802 with the pressure reducing sleeve 10, and the lower part of the large valve core 11 forms a second buffer space 803 with the lower sleeve 7.

[0031] The flow direction of the fluid in the fluid passage is in turn through the pressure reducing sleeve 10, the outer side of the large valve core 11, the lower part of the large valve core 11, and flows into the second buffer space 803. This stage is the first stage of pressure reduction; then in turn through the upper part of the large valve core 11, the small valve core 13, the valve core pressure cover 15, the lower part of the valve rod 18, the upper sleeve 14, the balance piston ring 23 and flows into the balance space 801. This stage is a pilot structure to balance the pressure of the large valve core 11; finally, in turn through the valve seat 9, the lower part of the large valve core 11, the nozzle 6, and out of the lower sleeve 7, and flows into the valve body 8. This stage is divided into two parts of fluid and temperature reducing water mixing and temperature reduction, and second stage of pressure reduction.

[0032] Within the second buffer space 803, the fluid flow direction in the fluid passage sequentially passes through the valve seat (9), the lower part of the large valve core 11, the nozzle 6, and the lower sleeve 7. The lower sleeve 7 is provided with several throttling orifices for fluid passage and the nozzle 6. That is, the fluid pressure inside and outside the lower sleeve 7 is regulated within the second buffer space 803, realizing the function of the second-stage pressure reduction structure; the cooling water of the nozzle (6) is cooled within the second buffer space 803, realizing the function of the cooling regulation structure.

[0033] Appendix Figure 1 The arrows in the diagram indicate the direction of medium flow.

[0034] In one example, the upper sleeve 14, valve core cover 15, set screw 22, upper part of large valve core 11, small valve core 13, disc spring 12, balance piston ring 23 and balance space 801 constitute a pilot-operated balance structure. The disc spring assembly stabilizes the valve internals and reduces unbalanced forces during the switching process.

[0035] The upper part of the large valve core 11 is provided with a groove for guiding the installation of the balance piston ring 23. The interior of the large valve core 11 has a structure for installing the disc spring 12, the small valve core 13, and the valve stem 18, and is fixed by the valve core cap 15 and the set screw 22. In the fluid passage, the fluid pressure in the upper and lower parts of the large valve core 11 is balanced within the balance space 801, realizing the function of the pilot-operated balance structure.

[0036] In one example, the outer side of the large valve core 11, the inner side of the pressure-reducing sleeve 10, and the first buffer space 802 constitute the first-stage pressure-reducing structure, realizing the regulation of fluid pressure inside and outside the pressure-reducing sleeve 10. The porous large valve core 11 and the pressure-reducing sleeve 10 can disperse the fluid into several small jets, and the energy of each jet is canceled out, reducing the erosion damage to the valve internals, reducing the noise of gas impact, and improving the service life of the regulating valve.

[0037] The pressure-reducing sleeve 10 and the large valve core 11 are provided with several throttling orifices at their lower parts for fluid passage. The fluid in the fluid passage regulates the fluid pressure inside and outside the pressure-reducing sleeve 10 within the first buffer space 802, enhancing the function of the first-stage pressure-reducing structure.

[0038] In one example, the lower part of the large valve core 11, the valve seat 9, the lower sleeve 7, the nozzle 6, and the second buffer space 803 constitute a second-stage pressure reduction structure and an integrated desuperheating and pressure-reducing structure. This achieves fluid pressure regulation inside and outside the lower sleeve 7. The porous large valve core 11, the lower sleeve 7, and the nozzle 6 can improve the cooling effect of the desuperheating water, optimize the mixing effect of the gas and liquid phases, and reduce the temperature and noise of the discharged gas.

[0039] In one example, a guide sleeve 17 is arranged between the bottom end of the upper valve cover 21 and the valve rod 18. The outer side of the large valve core 11 and the lower part are matched with the pressure reducing sleeve 10 and the valve seat 9 through a gap, and the guide function of the parts is completed together with the guide sleeve 17. The multiple guide structures can reduce the vibration when the valve is opened and closed, reduce the unbalanced force when the valve is opened and closed, and make the action stable and easy to control.

[0040] In one example, a plurality of sealing gaskets 24 are arranged at the connection between the valve body 8, the upper sleeve 14, and the valve seat 9. A plurality of sealing gaskets 5 are arranged at the connection between the valve body 8, the lower sleeve 7, the lower valve cover 4, the lower flange 1, and the nozzle 6. The sealing effect in the desuperheater is guaranteed, and internal leakage is rejected.

[0041] In one example, the upper valve cover 21, the valve body 8, the lower valve cover 4, and the lower flange 1 are connected through the bolt fasteners 2, 3, and 16. Exemplarily, a double-headed bolt and a nut are used for fastening connection.

[0042] In one example, the top of the upper valve cover 21 is provided with a groove, the groove is provided with a packing 19, and the groove is provided with a packing fixing assembly 20, and the valve rod 18 passes through the groove and the packing fixing assembly 20. The packing is a special packing for high temperature and high pressure working conditions, which can ensure the sealing performance of the packing during work and reject external leakage of the valve.

[0043] In one example, through holes with gradually increasing sizes are arranged on the pressure reducing sleeve 10, the large valve core 11, and the lower sleeve 7. The through holes are used to allow water and / or steam to pass. In fact, the size of the through hole matches the size of the sleeve itself, otherwise the strength of the sleeve may be reduced. In the prior art, the design of the through hole often only considers the size and material of the sleeve, and the starting point of the consideration only involves strength, site, and price. However, the present application considers the resistance change of the through hole passed continuously to affect the size of the through hole, that is, the size of the through hole is set from the specific pressure reducing effect.

[0044] Preferably, small through holes are arranged on the pressure reducing sleeve 10, medium through holes are arranged on the lower part of the large valve core 11, and large through holes are arranged on the upper part of the lower sleeve 7. The radius Rs of the small through hole is smaller than the radius Rm of the medium through hole, and the radius Rm of the medium through hole is smaller than the radius Rl of the large through hole.

[0045] Preferably, the through holes are uniformly arranged on the surface of the sleeve, for example, the interval is a fixed distance.

[0046] In one example, a sleeve resistance model is constructed to set the through holes with gradually increasing sizes. Specifically, the steps include:

[0047] Step S1: Calculate the pressure coefficient Cu of the pressure reducing sleeve 10, the large valve core 11, and the lower sleeve 7, respectively. Duθ Cu DmθCu Dlθ ;

[0048] Cu Duθ = 2 x Du θ / p x S x vu 2 (1);

[0049] Cu Dmθ = 2 x Dm θ / p x S x vm 2 (2);

[0050] Cu Dlθ = 2 x Di θ / p x S x vi 2 (3);

[0051] Wherein: Cu Duθ , Cu Dmθ , Cu Dlθ are the fluid impact pressure borne by the pressure relief sleeve 10, the large valve core 11 and the lower sleeve 7, that is, the pressure corresponding to the buffer space near the sleeve position; p is the fluid density g / cm3; S is the sleeve area cm2; vu, vm, vl are the fluid velocities of the pressure relief sleeve 10, the large valve core 11 and the lower sleeve 7 cm / s; and the angle between the sleeve surface and the fluid impact direction is θ;

[0052] Step S2: simulate the relationship between the impact pressure and the Reynolds number under different through-hole size settings;

[0053] Cu Duθ = A x Re du -A1 (4);

[0054] Cu Dmθ = B x Re dm -B1 (5);

[0055] Cu Dlθ = C x Re dl -C1 (6);

[0056] Wherein: A, B, C and A1, B1, C1 are linear coefficients obtained by simulation;

[0057] Preferably, the test data is fitted by using a nonlinear least squares method to obtain the relationship between the sleeve setting and the Reynolds number; the sleeve setting here is the through-hole size; the fitting accuracy can be improved by fixing other sleeve settings, such as the sleeve material and the sleeve area;

[0058] Step S3: Calculate the Reynolds coefficient Re of the pressure reduction sleeve 10, the large valve core 11 and the lower sleeve 7 respectively, taking the radius of the through hole as the characteristic length du , Re dm , Re dl ;

[0059] Re du = vu x ru / δ (7);

[0060] Re dm = vu x rm / δ (8);

[0061] Re dl = vu x rl / δ (9);

[0062] Wherein: δ is the viscosity coefficient of the fluid, N·s / m2;

[0063] Step S4: Calculate the average pressure coefficient of the pressure reduction sleeve 10, the large valve core 11 and the lower sleeve 7

[0064]

[0065]

[0066] Wherein: θ1=0 or 180 degrees; θ2=90 or 270 degrees;

[0067] Here, the water flow impact on the cylindrical sleeve is simplified as impact in 4 directions to avoid integral calculation and reduce experimental simulation and calculation complexity;

[0068] Step S5: Determine the numerical range or specific value of the average pressure coefficient;

[0069] Preferably, the relationship is a linear relationship;

[0070] Alternatively, determine the relationship between the average pressure coefficients of the pressure reduction sleeve 10, the large valve core 11 and the lower sleeve 7 based on the current pressure reduction standard or pressure reduction experience;

[0071]

[0072] Step S6: Determine the impact pressure Cu of the fluid to be reduced on the pressure reduction sleeve 10, the large valve core 11 and the lower sleeve 7 Duθ , CU Dmθ , CU Dlθ , based on formulas (1)-(12) to obtain the optimal solution of the through hole radius that satisfies the relationship coefficients c and d between the through holes; The determination method can be determined according to the on-site environment monitoring, or the pressure difference before and after pressure reduction is determined;

[0073] ru = c x rm = d x rl (13);

[0074] The relationship coefficients c and d between the through holes are calculated, specifically, c and d are in a multiple relationship, the multiple relationship is substituted into formula (11), the unknown parameter is determined as one, and the optimization solving difficulty is reduced; for example: d = 1.414 x c; the specific relationship is a processing rule or processing experience required to be met;

[0075] Preferably, one is selected as a target value in the optimal solution according to formula (13);

[0076] Alternatively, when there are multiple optimal solutions, one is selected as a target value through manual feedback;

[0077] The above scheme is based on a pilot type balanced structure, adopts a multi-stage pressure reduction principle, and can make the fluid multi-stage pressure reduction through punching on the flow passage positions of the pressure reduction sleeve, the large valve core and the lower sleeve. The temperature of the steam is reduced by the atomized temperature-reducing water from the nozzle after pressure reduction, and a multi-stage pressure reduction integrated temperature-reducing pressure reducer based on the pilot type is realized.

[0078] In fact, when it is determined that the type of pressure-reducing fluid is relatively certain, the optimal through hole can be set according to the field environment, and the size of the through hole can be calculated and made on site during the installation process, so that the same type of regulating valve can be most simply adapted to different field conditions, greatly improving customer experience and reducing processing difficulty.

[0079] The above detailed description further describes the purpose, technical scheme and beneficial effects of the present application. It should be understood that the above is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An integrated pressure and temperature reducer, comprising: The valve body (8), the upper valve cover (21), the lower valve cover (4), the lower flange (1), the upper sleeve (14), the lower sleeve (7), the pressure relief sleeve (10), the nozzle (6), the valve rod (18), the small valve core (13), the valve core gland (15), the large valve core (11), and the valve seat (9) are included. The upper valve cover (21) is located above the valve body (8), and the upper sleeve (14), the pressure relief sleeve (10), and the valve seat (9) are installed in the upper part of the valve body (8), and the lower sleeve (7), the lower valve cover (4), and the lower flange (1) are installed in the lower part of the valve body (8). The upper part of the large valve core (11) forms a balance space (801) with the upper sleeve (14), the outer side of the large valve core (11) forms a first buffer space (802) with the pressure relief sleeve (10), and the lower part of the large valve core (11) forms a second buffer space (803) with the lower sleeve (7); the upper part of the large valve core (11) is installed with a balance piston ring (2). Holes with gradually increasing sizes are arranged on the pressure relief sleeve (10), the large valve core (11), and the lower sleeve (7). A sleeve resistance model is constructed in advance to arrange the holes with gradually increasing sizes; specifically including the following steps. Step S1: Calculate the pressure coefficients Cu of the pressure reducing sleeve (10), the large valve core (11), and the lower sleeve (7) respectively Duθ ,Cu Dmθ ,Cu Dlθ ; Step S2: simulate and calculate the relationship between the impact pressure and the Reynolds coefficient under different hole size settings. Step S3: Calculate the Reynolds number Re of the pressure reducing sleeve (10), the large valve core (11), and the lower sleeve (7) respectively, using the through-hole radius ru, rm, and rl as the characteristic length du , Re dm , Re dl ; Step S4: calculate the average pressure coefficient of the pressure relief sleeve (10), the large valve core (11), and the lower sleeve (7). Step S5: determine the numerical range or specific value of the average pressure coefficient. Step S6: determine the impact pressure of the fluid to be reduced on the pressure relief sleeve (10), the large valve core (11), and the lower sleeve (7), and obtain the optimal solution of the hole radius that satisfies the relationship coefficients c and d between the holes to arrange the holes with gradually increasing sizes; specifically, it is determined according to the on-site environmental monitoring or the pressure difference before and after the pressure reduction.

2. The integral attemperator pressure reducer of claim 1, wherein Various sealing gaskets (24) are arranged at the connection between the valve body (8), the upper sleeve (14), and the valve seat (9).

3. The integral attemperator pressure reducer of claim 2, wherein In the balance space (801), the flow direction of the fluid in the fluid passage passes through the upper part of the large valve core (11), the valve core (13), the valve core gland (15), the lower part of the valve rod (18), the upper sleeve (14), and the balance piston ring (23) in sequence.

4. The integral attemperator pressure reducer of claim 2, wherein Various sealing gaskets (5) are arranged at the connection between the valve body (8), the lower sleeve (7), the lower valve cover (4), the lower flange (1), and the nozzle (6).

5. The integral attemperator pressure reducer of claim 1, wherein The fluid in the fluid passage realizes the fluid pressure balance between the upper part of the large valve core (11) and the lower part of the large valve core (11) in the balance space (801), realizing the function of the pilot balanced structure.

6. The integral attemperator pressure reducer of claim 5, wherein In the first buffer space (802), the flow direction of the fluid in the fluid passage passes through the pressure relief sleeve (10), the outer side of the large valve core (11), and the lower part of the large valve core (11) in sequence.

7. The integral attemperator pressure reducer of claim 1, wherein By punching holes at the flow-through positions of the pressure relief sleeve, the large valve core, and the lower sleeve, the fluid can be multi-stage reduced in pressure.

8. The integral attemperator pressure reducer of claim 7, wherein, After pressure reduction, the temperature of the steam is reduced by the atomized temperature-reducing water from the nozzle.

9. The integral attemperator pressure reducer of claim 8, wherein, Pressure reduction and temperature reduction are realized at the same time.

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