Miniature single-acting slide valve for catalytic cracking small-scale test device

Abstract

The invention discloses a miniature single-acting slide valve for a catalytic cracking small-scale test device. The valve comprises a valve body and a valve plate, a rear cover and a guide rail are sequentially and fixedly arranged in the valve body in the transverse direction, and a valve rod drives the valve plate to slide back and forth along the guide rail to control closing and opening of the valve and flow of a catalyst; one longitudinal side of the valve body is communicated with the inlet pipeline, and the other longitudinal side of the valve body is sequentially communicated with the lower valve body and the outlet pipeline; a valve seat ring is fixedly arranged on the side, communicated with the inlet pipeline, in the valve body, and a gap is formed between the end face of the valve seat ring and the valve plate. The single-acting slide valve has the beneficial effects that the structural design is reasonable, parts in a high-temperature working area of the single-acting slide valve are connected in a bolt-free manner, the bolt seizure or fracture phenomenon caused by high temperature is avoided, and a guarantee is provided for long-period safe operation of the slide valve; main parts are formed by forging stainless steel materials and have good mechanical performance; cobalt-based hard alloy layers are overlaid on the surfaces of the sliding groove and the valve plate, the hardness is improved, and the service life of the miniature single-action sliding valve is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to a micro single-acting slide valve, in particular to a micro single-acting slide valve for a small-scale catalytic cracking test device, belonging to the technical field of petrochemical devices. Background Art

[0002] The single-acting slide valve used in the refining industry is one of the extremely important devices for controlling and regulating the catalyst flow rate in the catalytic cracking unit. It is installed on the catalyst circulation pipelines between two regenerators of the heavy oil catalytic cracking unit, as well as between the regenerator and the settler, riser, external heat exchanger, and coke burning tank, for controlling the catalyst circulation rate and cutting off the catalyst circulation system during startup, shutdown, or accidents. The small-scale catalytic cracking test device is a small-scale test device different from the large-scale industrial catalytic cracking device in the refining industry. It is mainly used to investigate the performance of various feedstock oils and catalysts, explore the catalytic cracking process conditions, and study the catalytic cracking reaction kinetics. The small-scale catalytic cracking test device has a strong correlation with the industrial catalytic cracking device in the refining industry and can predict the actual use effect of the catalyst.

[0003] For the single-acting slide valve used in the small-scale catalytic cracking test device, due to the small flow rate of the test medium, it is required that the valve opening area is small, the size of the throttling internal parts in the high-temperature area is small, and the flow channel has the performance of resisting catalyst wear; the working temperature can reach up to 700 °C, and the expansion and deformation of parts are likely to cause the valve to be "stuck". Summary of the Invention

[0004] In order to meet the special working condition requirements of the single-acting slide valve for the small-scale catalytic cracking test device, the present invention provides a micro single-acting slide valve for a small-scale catalytic cracking test device with high-temperature resistance and wear resistance.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a micro single-acting slide valve for a small-scale catalytic cracking test device, including a valve body and a valve plate. A rear cover and a guide rail are fixedly arranged in the valve body in sequence along the transverse direction. The valve stem drives the valve plate to reciprocate along the guide rail to control the closing, opening of the valve, and the flow rate of the catalyst. One side of the valve body in the longitudinal direction is communicated with an inlet pipeline, and the other side of the valve body in the longitudinal direction is communicated with a lower valve body and an outlet pipeline in sequence.

[0006] A valve seat ring is fixedly arranged on the side of the valve body communicated with the inlet pipeline, and there is a gap between the end face of the valve seat ring and the valve plate.

[0007] The end of the valve stem is connected with the valve plate through an I-shaped groove; the valve stem is driven by an electric actuator.

[0008] The cross-section of the guide rail is L-shaped. A pair of guide rails are arranged facing each other to form a chute. The valve plate slides along the chute, and a cobalt-based hard alloy layer is surfacing-welded on the surface of the chute. The L-shaped guide rail is provided with a through groove perpendicular to the chute for discharging catalyst particles.

[0009] The surface of the valve plate is surfacing welded with a cobalt-based hard alloy layer; the surface of the valve stem is spray welded with a nickel-based hard alloy layer.

[0010] Furthermore, the guide rail and the valve body are fixedly connected by welding; the valve seat ring and the valve body are fixedly connected by welding.

[0011] One end of the valve body where the valve stem is installed is fixedly connected to the valve cover and the support sleeve in sequence, and the valve cover is provided with a radial liquid packing injection pipe.

[0012] Furthermore, a metal corrugated composite gasket is arranged between the valve cover and the valve body; a packing seal gland is arranged at one end of the valve cover close to the support sleeve.

[0013] Furthermore, the valve cover is provided with a radial through hole communicated with the purge pipe.

[0014] Furthermore, the valve body, the valve plate and the guide rail are forged from 06Cr19Ni10 stainless steel.

[0015] The beneficial effects of the present invention are as follows: the structure is reasonably designed. In the high-temperature working area of the single-acting slide valve, the parts adopt a boltless connection method, avoiding the phenomenon of bolt jamming or fracture due to high temperature, providing guarantee for the long-term safe operation of the slide valve; the main components are forged from heat-resistant stainless steel, having good mechanical properties; the sliding groove and the valve plate surface are surfacing welded with a cobalt-based hard alloy layer, improving the hardness and increasing the wear resistance, effectively improving the service life of the micro single-acting slide valve. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the micro single-acting slide valve for the small-scale catalytic cracking test device of the present invention.

[0017] Figure 2 is Figure 1 the A-A view of

[0018] Figure 3 is Figure 1 the B-B view of

[0019] Figure 4 is a schematic structural diagram of the guide rail in the present invention.

[0020] In the figure: 1. Rear cover, 2. Valve seat ring, 3. Valve plate, 4. Valve body, 5. Guide rail, 6. Valve stem, 7. Lower valve body, 8. Liquid packing injection pipe, 9. Sliding groove, 10. Through groove, 11. Support sleeve, 12. Valve cover, 13. Packing seal gland, 14. Purge pipe, 15. Metal corrugated composite gasket, 16. Packing gland. Detailed Embodiments

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and as long as it conforms to the spirit of the present invention, it should be included within the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing or simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected", "sealed" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, indirectly connected through an intermediate medium, or the communication inside two elements. The seal can be an oil seal, a packing seal or other forms of seals. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See the attached Figures 1-3 A micro single-acting slide valve for a small-scale catalytic cracking test device of the present invention includes a valve body 4, a valve plate 3, and a valve stem 6. A rear cover 1 and a guide rail 5 are fixedly arranged in the valve body 4 in the transverse direction in sequence. The valve stem 6 drives the valve plate 3 to reciprocate along the guide rail 5 to control the closing, opening of the valve and the flow rate of the catalyst; one side of the valve body 4 in the longitudinal direction is communicated with an inlet pipe, and the other side of the valve body 4 in the longitudinal direction is communicated with a lower valve body 7 and an outlet pipe in sequence. The valve stem 6 is driven by an electric actuator.

[0025] A valve seat ring 2 is fixedly arranged on the side of the valve body 4 communicated with the inlet pipe. There is a gap between the end face of the valve seat ring 2 and the valve plate 3 to prevent the valve plate 3 from getting stuck due to expansion when reciprocating under high-temperature conditions. Further, the valve seat ring 2 and the valve body 4 are fixedly connected by welding.

[0026] The inner hole of the valve seat ring 2 in this embodiment is a straight hole, and the aperture is the same as the size and shape of the liquid inlet flow channel of the valve body 4, which can reduce the local erosion and wear of the valve body 4 by the medium. The inner hole of the lower valve body 7 is a tapered hole with a larger upper part and a smaller lower part, which effectively reduces the erosion of the catalyst on the outlet pipe; preferably, the taper angle of the tapered hole is 60°. The medium (such as catalyst) enters the valve body 4 from the inlet pipe, and then flows through the valve seat ring 2, the valve plate 3, and the lower valve body 7 and then enters the outlet pipe.

[0027] The end of the valve stem 6 is connected to the valve plate 3 through a grooved joint. Preferably, the grooved joint is provided at the end of the valve plate 3, and the cross-shaped part is provided at the end of the valve stem 6. The valve stem 6 and the valve plate 3 are connected by a grooved joint, and there is a gap between the axial directions of the valve stem 6 and the valve plate 3 to accommodate the displacement during thermal expansion and contraction.

[0028] The cross-section of the guide rail 5 is L-shaped. A pair of guide rails 5 are arranged facing each other to form a chute 9, and the valve plate 3 slides along the chute 9; the L-shaped guide rail 5 is provided with a through groove 10 perpendicular to the chute 9 (as Figure 4 shown), and when the valve plate 3 slides along the chute 9, the particulate matter in the accumulated catalyst can be pushed into the through groove 10 for discharge. The guide rail 5 and the valve body 4 are fixedly connected by welding.

[0029] The valve body 4, the valve plate 3, and the guide rail 5 are forged from 06Cr19Ni10 stainless steel, thus having good mechanical properties.

[0030] The surface of the chute 9 is surfacing welded with a cobalt-based hard alloy layer, and the surface of the valve plate 3 is surfacing welded with a cobalt-based hard alloy layer. The cobalt-based hard alloy layer has high strength, good thermal fatigue resistance, thermal corrosion resistance, wear resistance, and good welding performance, which can improve the surface hardness of the chute 9 and the valve plate 3 and effectively improve the service life of the micro single-acting slide valve.

[0031] The guide rail 5 and the valve body 4 are fixedly connected by welding, the end of the valve stem 6 is connected to the valve plate 3 through a grooved joint, and the valve seat ring 2 and the valve body 4 are fixedly connected by welding. In the high-temperature working area inside the micro single-acting slide valve, a boltless connection method is adopted, which can avoid the phenomena of bolt jamming or fracture and provide guarantee for the long-term safe operation of the slide valve.

[0032] One end of the valve body 4 where the valve stem 6 is installed is fixedly connected to the valve cover 12 and the support sleeve 11 in sequence. The valve cover 12 is provided with a radial liquid packing injection pipe 8, and a viscous mixture of liquid seal packing lithium molybdate grease with graphite powder is injected through the liquid packing injection pipe 8.

[0033] A metal corrugated composite gasket 15 is provided between the valve cover 12 and the valve body 4. A packing seal chamber 13 is provided at one end of the valve cover 12 close to the support sleeve 11. The packing seal chamber 13 includes, but is not limited to, a wire wound packing, an oil retaining ring, a wire wound packing, a packing gasket, a wire wound packing, a flexible graphite ring, and a wire wound packing arranged in sequence from the inside to the outside, and is axially fixed by a packing gland 16 fixedly installed at the end of the valve cover 12.

[0034] The valve stem 6 is forged from 06Cr19Ni10 stainless steel or high-temperature alloy steel. The surface of the valve stem 6 is spray-welded with a nickel-based hard alloy layer, making its surface hardened layer thick and uniform, having high geometric accuracy and smooth surface after grinding, which is beneficial to improving the sealing performance of the packing.

[0035] The valve cover 12 is provided with a radial through hole communicating with the purge pipe 14.

[0036] The micro single-acting slide valve for the catalytic cracking pilot plant of the present invention is mainly applied to the catalytic cracking pilot plant to adjust the flow rate of the fluidized catalyst. The required single-acting slide valve structure for the catalytic cracking pilot plant is small, and the caliber is generally DN25 - DN75.

[0037] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A micro single-acting slide valve for a fluid catalytic cracking pilot plant, comprising a valve body and a valve plate, Characterized in that: A rear cover and a guide rail are fixedly arranged in the valve body in sequence along the transverse direction, and a valve stem drives the valve plate to reciprocate along the guide rail to control the closing, opening of the valve and the flow rate of the catalyst; One side of the valve body in the longitudinal direction is communicated with an inlet pipeline, and the other side of the valve body in the longitudinal direction is sequentially communicated with a lower valve body and an outlet pipeline.

2. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 1, Characterized in that: A valve seat ring is fixedly arranged on one side of the valve body communicated with the inlet pipeline, and there is a gap between the end face of the valve seat ring and the valve plate.

3. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 2, Characterized in that: The end of the valve stem is connected with the valve plate through an I-shaped groove; The valve stem is driven by an electric actuator.

4. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 3, Characterized in that: The cross section of the guide rail is L-shaped, and a pair of guide rails are arranged facing each other to form a chute, and the valve plate slides along the chute, and a cobalt-based hard alloy layer is surfacing-welded on the surface of the chute; The L-shaped guide rail is perpendicular to the chute and is provided with a through groove for discharging catalyst particles.

5. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to any one of claims 1-4, Characterized in that: A cobalt-based hard alloy layer is surfacing-welded on the surface of the valve plate; A nickel-based hard alloy layer is spray-welded on the surface of the valve stem.

6. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 1, Characterized in that: The guide rail is fixedly connected with the valve body by welding; The valve seat ring is fixedly connected with the valve body by welding.

7. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 1, Characterized in that: One end of the valve body where the valve stem is installed is fixedly connected with a valve cover and a support sleeve in sequence, and the valve cover is provided with a radial liquid packing injection pipe.

8. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 7, Characterized in that: A metal corrugated composite gasket is arranged between the valve cover and the valve body; A packing seal gland is arranged at one end of the valve cover close to the support sleeve.

9. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 8, Characterized in that: The valve cover is provided with a radial through hole communicated with a purge pipe.

10. The micro single-acting slide valve for a fluid catalytic cracking pilot plant according to claim 1, Characterized in that: The valve body, the valve plate and the guide rail are forged from 06Cr19Ni10 stainless steel.

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