Gas-liquid coalescing separator for steam boilers

Abstract

The present disclosure relates to a gas-liquid coalescing separator for a steam boiler, and relates to the field of steam stimulation heavy oil thermal recovery. The gas-liquid coalescing separator includes a plurality of gas-liquid fine separation units, gas-liquid fine separation unit mounting sleeves, a gravity settling unit, and an M-shaped meandering wing inertial separation unit; the gas-liquid fine separation unit includes a coalescence-cyclone section, an annular meandering wing outlet section, a top spiral section, a strong swirl fine separation section, and an overflow section that are connected in sequence, and is used to achieve multiple coalescence and removal of small droplets. The gravity settling unit is used to perform gas-liquid separation on the underflow medium with less gas and more water again; the M-shaped meandering wing inertial separation unit is used to make small droplets collide again to complete the third coalescence of small droplets. This separator combines cyclone separation, wall impact coalescence, meandering wing separation, and gravity settling, can achieve multi-stage series-parallel gas-liquid coalescing separation, solve the problem of liquid in the gas phase, and improve the steam dryness.

Description

Technical Field

[0001] The present disclosure relates to the field of steam stimulation heavy oil thermal recovery, and specifically, to a gas-liquid coalescence separation unit applied to a steam boiler. Background Art

[0002] China is rich in heavy oil resources and has great exploitation potential. Due to the high viscosity and poor fluidity of heavy oil, the steam stimulation heavy oil thermal recovery technology has become the most effective and common exploitation method at present and is widely used in areas rich in heavy oil resources in China. The steam stimulation method for heavy oil thermal recovery injects high-temperature and high-pressure steam into the reservoir, causing the heavy oil to expand by heating and reduce its viscosity, thereby improving its fluidity and facilitating exploitation. Since the higher the steam dryness, the more beneficial it is to heavy oil exploitation, but with the continuous deepening of heavy oil exploitation, it is found that the steam dryness generated during the actual operation of existing boilers can no longer meet the process conditions of heavy oil steam thermal recovery. Therefore, technicians need to find a more efficient gas-liquid coalescence separation unit to improve the steam dryness, thereby improving the production effect of heavy oil steam stimulation / steam flooding and increasing the heavy oil production.

[0003] As shown in the document with the publication number CN220303615U, a steam-water separation device inside the drum is disclosed, which is used to improve the steam dryness. However, under this scheme, the separation principle is single, and it still results in insufficient dryness of the gas phase, unable to meet the process conditions of heavy oil steam thermal recovery. As shown in the document with the publication number CN114146496A, a method of connecting multiple cyclone separators in series is proposed to increase the steam dryness, but this method will increase the pressure loss and is not conducive to energy saving. As shown in the document with the publication number CN110743252B, a single centrifugal separation principle is used, which cannot handle the working conditions of vibration and pulsating feeding. When the working conditions are unstable, its separation efficiency will decrease, resulting in incomplete gas-liquid separation. As shown in the document with the publication number CN213362421U, a secondary wire mesh separator is provided at the partition baffle, which can reduce the phenomenon of liquid carry-over at the outlet to a certain extent. However, the separator does not have a multi-stage coalescence separation stage for small liquid droplets. When the liquid volume fraction is too large, the separation ability of the separator is limited, and the separation ability of the wire mesh separator is also limited, resulting in an increase in the degree of liquid carry-over at the outlet. As shown in the document with the publication number CN219976378U, a multi-stage separation method using a cyclone separation component, a corrugated plate separation component, and a wire mesh separation component is used, but there is no separation process for small bubbles in the separated liquid phase, which is likely to cause some gas phase loss and result in incomplete gas-liquid separation.

[0004] In summary, the steam dryness generated during the actual operation of existing steam boiler gas-liquid separation devices cannot meet the process conditions of heavy oil steam thermal recovery. Summary of the Invention

[0005] To solve the existing technical problems raised in the background art, the present disclosure proposes a gas-liquid coalescing separator for a steam boiler. This separator combines cyclone separation, wall impact coalescence, meandering wing separation, and gravity sedimentation, and can achieve efficient and rapid gas-liquid coalescing separation in a multi-stage series-parallel connection. On the one hand, it fully utilizes the practicality and efficiency of the cyclone separator to solve the problem of liquid in the gas phase. On the other hand, by combining the advantages of the meandering wing separator, it realizes the function of "discarding water and preserving gas", greatly improving the steam dryness. Moreover, it has a simple and compact structure, occupies little space, and has strong practicality.

[0006] The present disclosure provides a gas-liquid coalescing separator for a steam boiler, including a gas-liquid fine separation unit 1 and a gas-liquid fine separation unit mounting sleeve 2;

[0007] The gas-liquid fine separation unit includes a coalescing-cyclone section 101, an annular meandering wing outlet section 102, a top spiral section 103, a strong swirl fine separation section 104, and an overflow section 105 connected in sequence; the annular meandering wing outlet section 102 is provided with fixed fins 1021 and an annular meandering wing channel 1022; the coalescing-cyclone section 101 is provided with a fixed groove 1012, and the annular meandering wing outlet section 102 and the coalescing-cyclone section 101 are aligned and pressed tightly through the fixed fins 1021 and the fixed groove 1012 to play a role of fixing and sealing;

[0008] The main overflow pipe 1051 of the overflow section is fixedly connected to the top overflow pipe 1031 of the top spiral section 103 by threaded connection; the annular meandering wing outlet section 102 is connected to the strong swirl fine separation section 104 by threaded connection; the secondary variable pitch spiral flow channel 1052 of the overflow section 105 and the primary variable pitch spiral flow channel 1032 of the top spiral section 103 are respectively connected to the annular meandering wing outlet section 102 and the coalescing-cyclone section 101 by interference fit;

[0009] The gas-liquid fine separation unit is used to achieve multiple coalescence and removal of small droplets;

[0010] The gas-liquid fine separation unit mounting sleeve includes a gas-liquid fine separation unit mounting sleeve 201, a gas-liquid fine separation unit mounting cover 202, and an inlet diverter 203;

[0011] The gas-liquid separation unit installation sleeve 201 is provided with a gas-liquid separation unit fixing hole 2011 and a liquid flow channel 2012. The gas-liquid separation unit 1 is placed into the gas-liquid separation unit fixing hole 2011 to form the liquid flow channel 2012. The gas-liquid separation unit installation cover 202 is provided with a top overflow pipe fixing hole 2021 and a diverter fixing hole 2022. The bottom and inner side of the gas-liquid separation unit installation sleeve 201 are provided with openings. The overflow section 105 is provided with a main overflow pipe 1051 and a secondary variable pitch spiral flow channel 1052. The top spiral section 103 is provided with a top overflow pipe 1031 and a primary variable pitch spiral flow channel 1032. The main overflow pipe 1051 and the top overflow pipe 1031 are fixed by threaded connection. The top spiral section 103 and the top overflow pipe fixing hole 2021 of the gas-liquid separation unit installation cover 202 are axially aligned and press-fitted to form a seal. The spiral flow channels on the top spiral section 103 and the overflow section 105 are variable pitch spiral flow channels.

[0012] The gas-liquid separation unit 1 and the gas-liquid separation unit fixing hole 2011 of the gas-liquid separation unit installation sleeve 201 are axially aligned and press-fitted.

[0013] The inlet diverter 203 and the diverter fixing hole 2022 of the gas-liquid separation unit installation cover 202 are connected by interference fit, which plays a role in positioning and fixing. The diverter fixing hole 2022 and the inlet pipe 404 are connected by welding.

[0014] The gas-liquid separation unit installation sleeve 201 and the gas-liquid separation unit installation cover 202 are connected by interference fit.

[0015] The gas-liquid mixed medium flowing in through the inlet pipe 404 is evenly divided by the inlet diverter 203 to ensure that the flow rate into each gas-liquid separation unit 1 is the same.

[0016] A number of sets of parallel gas-liquid separation units are arranged in the gas-liquid separation unit installation sleeve.

[0017] Furthermore, the inner wall of the coalescence-cyclone section 101 is provided with a droplet coalescence inclined plate 1011, which is used to make small droplets collide with the plate surface during rotation and coalesce until they are discharged from the annular curved flow wing outlet section 102.

[0018] Furthermore, a convex structure is provided at the outlet of the annular curved flow wing outlet section, which is used to coalesce small droplets and achieve preliminary separation, and form a liquid seal in the annular curved flow wing channel 1022 to prevent gas from passing through.

[0019] Further, the bottom of the inlet diverter 203 is cylindrical and the top is conical. The inlet diverter 203 has six fan-shaped grooves from top to bottom, with a fan angle of 60 degrees. The top is the conical top, and the bottom of the groove has an arc transition. Such a structural design enables the gas-liquid mixed medium flowing in through the inlet pipe 404 to be evenly divided into six parts by the inlet diverter 203, ensuring the same flow rate into each gas-liquid fine separation unit 1, and using the arc transition can minimize the pressure loss as much as possible.

[0020] Further, the gas-liquid coalescing separator further includes a gravity settling unit 4; the gravity settling unit is used for further gas-liquid separation of the underflow medium with less gas and more water;

[0021] The gravity settling unit 4 includes a settling cylinder 401, a support 402 and a settling shell 403;

[0022] A liquid phase outlet pipe 4011 is arranged at the bottom of the settling cylinder 401; the support 402 is located at the bottom of the settling cylinder 401 and is connected by bolts;

[0023] An inlet pipe 404 is arranged on the settling shell 403; the inlet pipe 404 is integrally formed with the settling shell 403;

[0024] The installation sleeve 201 of the gas-liquid fine separation unit is fixedly connected to the support 402 by bolts.

[0025] After adding the gravity settling unit, the underflow medium with less gas and more water can be further gas-liquid separated, and the gas not separated from the underflow medium can be separated out, reducing the waste of gas.

[0026] Further, the gas-liquid coalescing separator further includes an M-shaped meandering wing inertial separation unit 3;

[0027] The M-shaped meandering wing inertial separation unit 3 includes an M-shaped meandering wing 301, a top end cover 302 and a uniform pore plate 303;

[0028] The M-shaped meandering wing 301 is cylindrical and is composed of a plurality of M-shaped plates 3011 and a cylinder 3012;

[0029] The cylinder 3012 is divided into two identical semi-cylinders along the diameter;

[0030] The M-shaped plates 3011 are fixed to the inner side of one semi-cylinder by welding at intervals of 5 mm, and then the other semi-cylinder is welded to form an M-shaped channel and the M-shaped meandering wing 301;

[0031] The M-shaped meandering wing 301 is welded and sealed to the upper part of the uniform pore plate 303;

[0032] The top end cover 302 is provided with a gas-phase outlet pipe 3021, and the top end cover 302 is welded and sealed with the M-shaped meandering wing 301;

[0033] The uniform orifice plate 303 is uniformly perforated to ensure uniform gas-phase flow;

[0034] The uniform orifice plate 303 is located at the top of the settling shell 403, and the uniform orifice plate 303 is welded and sealed with the top of the settling shell 403.

[0035] After adding the M-shaped meandering wing inertial separation unit, when the overflow medium after the coalescence-cyclone fine separation stage and the gas separated during the gravity settling stage are mixed and continue to migrate upward to the upper part of the gas-liquid coalescence separation unit, a small amount of rising small droplets collide with the M-shaped meandering wing 301 due to their own inertia and coalesce into large droplets, and then fall back to the bottom of the settling cylinder 401 under the action of gravity, completing the removal of residual droplets and improving the steam dryness.

[0036] Further, the M-shaped plate 3011 is fixed to the inner side of a semi-cylinder by welding at an interval gap of 5 mm. The reason for choosing an interval gap of 5 mm as a preferred implementation parameter is that: the 5-mm interval gap can more effectively remove the residual small droplets in the mixed medium.

[0037] Further, the included angle of the M-shaped plate 3011 is 90°. The reason for choosing an included angle of 90° as a preferred implementation parameter is that: a larger angle is not conducive to the passage of gas, while a smaller angle is not conducive to the collision and coalescence of small droplets.

[0038] One or more of the above technical solutions adopted in the embodiments of this specification can achieve the following beneficial effects:

[0039] First, the gas-liquid mixed medium first flows into the gas-liquid fine separation unit at high speed from the inlet pipe. In the first-stage variable pitch spiral flow channel of the top spiral section, due to the swirling effect of the spiral flow channel, the gas-liquid mixed medium rotates at high speed in the first-stage variable pitch spiral flow channel and generates centrifugal force. Due to the different gas-liquid densities, the centrifugal forces they receive are also different. The gas with a small density migrates towards the axis, and the small droplets with a large density are thrown to the inner wall of the first-stage variable pitch spiral flow channel, and the small droplets are coalesced for the first time; then the gas-liquid mixed medium continues to rotate in the coalescence-cyclone section, the gas with a small density continues to migrate towards the axis, and the small droplets with a large density continue to be thrown onto the droplet coalescence inclined plate on the inner wall of the coalescence-cyclone section and collide and coalesce, completing the second coalescence of the small droplets; the droplets after the first coalescence and the second coalescence will move along the droplet coalescence inclined plate towards the annular meandering wing outlet section under the dual action of inertia and gravity. Due to the special structure of the annular meandering wing channel, the small droplets in the flow field collide again here, completing the third coalescence of the small droplets.

[0040] The liquids after the first coalescence, the second coalescence, and the third coalescence will successively enter the settling cylinder through the annular meandering wing channel and the liquid flow channel of the gas-liquid fine separation unit installation sleeve, and form a liquid seal in the annular meandering wing channel to prevent the gas from passing through, completing the preliminary separation of gas and liquid during the coalescence-cyclone fine separation period; the small liquid droplets that remain unseparated after the preliminary separation will follow the gas and continue to increase the swirling intensity in the secondary variable pitch spiral flow channel of the overflow section and enter the strong swirl fine separation section, and complete the fourth coalescence of the small liquid droplets in the secondary variable pitch spiral flow channel. The variable pitch spiral flow channels on the overflow section and the top spiral section also have the effect of reducing pressure loss.

[0041] Secondly, when the inlet feeds pulsatingly, due to the change of the inlet conditions, the internal flow field stability of the gas-liquid fine separation unit changes, and the separation efficiency may decrease. The gravity settling unit, as the second stage of gas-liquid separation, can separate the gas in the bottom flow mixed medium under the condition of pulsating feeding.

[0042] Thirdly, the meandering wing inertial separator, as the third stage of gas-liquid separation, can separate the rising small liquid droplets contained in the overflow mixed medium of the gas-liquid fine separation unit under the condition of pulsating feeding. These small liquid droplets collide with the M-shaped meandering wing due to their own inertia and coalesce into large liquid droplets, completing the fifth coalescence of the small liquid droplets, and under the action of gravity, they fall back to the bottom of the settling tank again, while the remaining pure gas will pass through the meandering wing inertial separation device along the M-shaped channel.

[0043] In addition, the installation sleeve of the gas-liquid fine separation unit can connect multiple sets of gas-liquid fine separation units in parallel according to the processing capacity, so that this gas-liquid coalescence separation unit can adapt to a larger range of processing capacities.

[0044] In summary, this gas-liquid coalescence separation unit can separate the gas-liquid mixed phase more precisely, and by multiple coalescences and multiple removals of small liquid droplets, it can greatly increase the dryness of the steam; in addition, this coalescence-cyclone fine separation device has a compact structure, is easy to install, has high separation efficiency, fast separation speed, saves costs, and is small in size, making it better suitable for application sites with limited space such as offshore drilling platforms.

[0045] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure.

[0046] Other features and aspects of the present disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Description of the Drawings

[0047] The accompanying drawings here are incorporated into the specification and form a part of this specification. These drawings show embodiments consistent with the present disclosure and are used together with the specification to illustrate the technical solutions of the present disclosure.

[0048] Figure 1 This is a schematic diagram of the overall structure under a preferred embodiment of the gas-liquid coalescing separator given in this disclosure.

[0049] Figure 2 This is an exploded view under a preferred embodiment of the gas-liquid coalescing separator given in this disclosure.

[0050] Figure 3 This is an exploded view of the structure of the gas-liquid fine separation unit and the installation sleeve of the gas-liquid fine separation unit.

[0051] Figure 4 This is an overall view of the gas-liquid fine separation unit.

[0052] Figure 5 This is an exploded view of the gas-liquid fine separation unit.

[0053] Figure 6 This is a schematic cross-sectional view of the internal structure of the gas-liquid fine separation unit.

[0054] Figure 7 This is a schematic diagram of the coalescing-cyclone section structure.

[0055] Figure 8 This is a schematic diagram of the outlet section of the annular meandering wing.

[0056] Figure 9 This is a cross-sectional view of the outlet section of the annular meandering wing.

[0057] Figure 10 This is an enlarged view of the uniform pore plate.

[0058] Figure 11 This is an enlarged view of the inlet diverter.

[0059] Figure 12 This is an enlarged view of the top spiral section.

[0060] Figure 13 This is an enlarged view of the overflow section.

[0061] Figure 14 This is a cross-sectional view of the installation sleeve of the gas-liquid fine separation unit.

[0062] Figure 15 This is a partial enlarged view after the installation sleeve of the gas-liquid fine separation unit and the gas-liquid fine separation unit are installed.

[0063] Figure 16 (a) This is a cross-sectional view of the M-shaped meandering wing.

[0064] Figure 16 (b) This is a schematic diagram of the M-shaped meandering wing.

[0065] Figure 16 (c) This is an exploded view of the M-shaped meandering wing.

[0066] In the figure: 1 - gas-liquid fine separation unit, 101 - coalescence - cyclone section, 1011 - droplet coalescence inclined plate, 1012 - fixed groove, 102 - annular meandering wing outlet section, 1021 - fixed fin, 1022 - annular meandering wing channel, 103 - top spiral section, 1031 - top overflow pipe, 1032 - first-stage variable pitch spiral flow channel, 104 - strong swirl fine separation section, 105 - overflow section, 1051 - main overflow pipe, 1052 - second-stage variable pitch spiral flow channel, 2 - gas-liquid fine separation unit installation sleeve, 201 - gas-liquid fine separation unit installation sleeve tube, 2011 - gas-liquid fine separation unit fixing hole, 2012 - liquid flow channel, 202 - gas-liquid fine separation unit installation sleeve cover, 2021 - top overflow pipe fixing hole, 2022 - shunt device fixing hole, 203 - inlet shunt device, 3 - M-shaped meandering wing inertial separation unit, 301 - M-shaped meandering wing, 3011 - M-shaped plate, 3012 - cylinder body, 302 - top end cover, 3021 - gas phase outlet pipe, 303 - uniform air hole plate, 4 - gravity sedimentation unit, 401 - sedimentation cylinder, 4011 - liquid phase outlet pipe, 402 - support, 403 - sedimentation shell, 404 - inlet pipe. Detailed implementation manners

[0067] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0068] In addition, for a better illustration of the present disclosure, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present disclosure can also be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present disclosure.

[0069] It can be understood that the above-mentioned various method embodiments of the present disclosure can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present disclosure will not elaborate further.

[0070] As Figure 1 Combined with Figure 2 shown, for the high-efficiency and rapid gas-liquid coalescence separator for steam boilers described in the present disclosure, the most preferred implementation manner is that it includes a gas-liquid fine separation unit 1, a gas-liquid fine separation unit installation sleeve 2, an M-shaped meandering wing inertial separation unit 3, and a gravity sedimentation unit 4.

[0071] As Figure 4 , Figure 5 , Figure 6As shown, the gas-liquid fine separation unit 1 includes a coalescence-cyclone section 101, an annular meandering wing outlet section 102, a top spiral section 103, a strong swirl fine separation section 104, and an overflow section 105; the gas-liquid fine separation unit mounting sleeve 2 includes a gas-liquid fine separation unit mounting sleeve 201, a gas-liquid fine separation unit mounting cover 202, and an inlet diverter 203.

[0072] The five sections of the coalescence-cyclone section 101, the annular meandering wing outlet section 102, the top spiral section 103, the strong swirl fine separation section 104, and the overflow section 105 are connected in series to form a gas-liquid fine separation unit 1; as Figure 11 shown, the inlet diverter 203 is connected to the diverter fixing hole 2022 of the gas-liquid fine separation unit mounting cover 202 by interference fit, playing a positioning and fixing role; the inlet pipe 404 is connected to the diverter fixing hole 2022 by welding, playing a sealing role; the gas-liquid mixed medium can be evenly divided into several parts through the inlet diverter 203 to ensure that the flow rate into each gas-liquid fine separation unit 1 is the same;

[0073] The inner wall of the coalescence-cyclone section 101 is provided with droplet coalescence inclined plates 1011. Small droplets collide with and coalesce with them during rotation, move along the droplet coalescence inclined plates 1011, and are finally pre-discharged from the annular meandering wing outlet section 102; due to its unique structural design, the outlet part of the annular meandering wing outlet section 102 can pre-separate a part of the liquid, and at the same time, the corrugated outlet can prevent gas from overflowing. The annular meandering wing outlet section 102 is connected to the strong swirl fine separation section 104 by threads, and also plays a sealing role.

[0074] The annular meandering wing outlet section 102 further includes fixing fins 1021 and an annular meandering wing channel 1022. The annular meandering wing channel 1022 is used to carry the preliminarily separated liquid-phase medium; the coalescence-cyclone section 101 further includes a fixing groove 1012. The annular meandering wing outlet section 102 and the coalescence-cyclone section 101 are aligned and pressed tightly through the fixing fins 1021 and the fixing groove 1012, playing a fixing and sealing role.

[0075] As Figure 14As shown, the installation sleeve 201 of the gas-liquid separation unit further includes a fixing hole 2011 for the gas-liquid separation unit and a liquid flow channel 2012. When the gas-liquid separation unit 1 is inserted into the fixing hole 2011 of the installation sleeve 201 of the gas-liquid separation unit, the liquid flow channel 2012 is formed. The installation cover 202 of the gas-liquid separation unit further includes a fixing hole 2021 for the top overflow pipe and a fixing hole 2022 for the diverter. The bottom and inner side of the installation sleeve 201 of the gas-liquid separation unit are provided with openings so that the separated liquid phase flows into the bottom of the settling cylinder 401. The overflow section 105 is provided with a main overflow pipe 1051 and a secondary variable pitch spiral flow channel 1052. The main overflow pipe 1051 plays a role in coalescence and increasing the swirling strength. The top spiral section 103 is also provided with a top overflow pipe 1031 and a primary variable pitch spiral flow channel 1032. Further, the main overflow pipe 1051 of the overflow section 105 is fixedly connected to the top overflow pipe 1031 of the top spiral section 103 by threaded connection. The top spiral section 103 and the fixing hole 2021 of the top overflow pipe of the installation cover 202 of the gas-liquid separation unit are aligned axially and assembled with interference to form a seal to prevent gas leakage. The spiral flow channels on the top spiral section 103 and the overflow section 105 are variable pitch spiral flow channels, which have the functions of reducing pressure loss and a certain coalescence effect.

[0076] The top overflow pipe 1031 of the gas-liquid separation unit 1 is aligned axially with the fixing hole 2011 of the installation sleeve 201 of the gas-liquid separation unit and assembled with interference.

[0077] Multiple sets of gas-liquid separation units 1 (six sets are taken as an example in this disclosure) can be connected in parallel in the installation sleeve 201 of the gas-liquid separation unit according to the processing capacity. The installation sleeve 201 of the gas-liquid separation unit is fixedly connected to the bracket 402 at the bottom of the settling cylinder 401 by bolts.

[0078] As Figure 8 、 Figure 9 As shown, the M-shaped meandering wing inertial separation unit 3 includes an M-shaped meandering wing 301, a top end cover 302 and a uniform air hole plate 303; the M-shaped meandering wing 301 further includes an M-shaped plate 3011 and a cylinder 3012. The M-angle of the M-shaped plate 3011 is 90°. The M-shaped meandering wing 301 is cylindrical as a whole. The M-shaped meandering wing 301 is composed of a plurality of M-shaped plates 3011 and a cylinder 3012. The M-shaped plates 3011 are processed by a mold. The cylinder 3012 is divided into two identical semi-cylinders along the diameter and processed separately. The M-shaped plates 3011 are fixedly welded to the inner side of one semi-cylinder at an interval of 5 mm, and then the other semi-cylinder is welded to form an M-shaped channel and the M-shaped meandering wing 301; it is welded and sealed with the upper part of the uniform air hole plate 303; the M-shaped meandering wing 301 can collide with small liquid droplets during the rising process to make them coalesce into large liquid droplets, so as to fall into the bottom of the settling cylinder 401 under the action of gravity, having the function of gas-liquid separation;

[0079] The top end cover 302 further includes a gas-phase outlet pipe 3021. The top end cover 302 is fixedly sealed by welding with the M-shaped meandering wing 301 to prevent gas leakage.

[0080] The uniform pore plate 303 is uniformly perforated to ensure uniform gas-phase flow.

[0081] The gravity sedimentation unit 4 includes a sedimentation cylinder 401, a bracket 402, and a sedimentation shell 403.

[0082] The bottom of the sedimentation cylinder 401 further includes a liquid-phase outlet pipe 4011; the bracket 402 is located at the bottom of the sedimentation cylinder 401 and is connected by bolts; the sedimentation shell 403 is provided with an inlet pipe 404 integrally formed with the sedimentation shell 403; the uniform pore plate 303 is located at the top of the sedimentation shell 403, and the uniform pore plate 303 is welded and sealed with the top of the sedimentation shell 403.

[0083] The main overflow pipe 1051 of the overflow section 105 is fixedly connected by screwing with the top overflow pipe 1031 of the top spiral section 103; the annular meandering wing outlet section 102 and the coalescence-cyclone section 101 are aligned and pressed tightly through the fixing fins 1021 and the fixing grooves 1012, and the annular meandering wing outlet section 102 is connected by screwing with the strong swirl refining section 104; further, the secondary variable pitch spiral flow channel 1052 of the overflow section 105 and the primary variable pitch spiral flow channel 1032 of the top spiral section 103 are respectively connected with the annular meandering wing outlet section 102 and the coalescence-cyclone section 101 through interference fit; after connecting the above-mentioned coalescence-cyclone section 101, annular meandering wing outlet section 102, top spiral section 103, strong swirl refining section 104, and overflow section 105, the gas-liquid refining unit 1 is obtained. The top overflow pipe 1031 of the top spiral section 103 and the top overflow pipe fixing hole 2021 of the gas-liquid refining unit installation sleeve cover 202 are assembled with interference fit in axial alignment. The coalescence-cyclone section 101 and the annular meandering wing outlet section 102 of the gas-liquid refining unit 1 and the gas-liquid refining unit fixing hole 2011 of the gas-liquid refining unit installation sleeve 201 are fixed through interference fit to form a liquid flow channel 2012; further, the gas-liquid refining unit installation sleeve 201 and the gas-liquid refining unit installation sleeve cover 202 are connected through interference fit, and the inlet diverter 203 and the diverter fixing hole 2022 of the gas-liquid refining unit installation sleeve cover 202 are connected through interference fit; after connecting the above-mentioned gas-liquid refining unit 1, gas-liquid refining unit installation sleeve 201, gas-liquid refining unit installation sleeve cover 202, and inlet diverter 203, the coalescence-cyclone refining device is formed.

[0084] The lower part of the M-shaped meandering wing 301 is connected to the uniform air hole plate 303 by welding, and the upper part of the M-shaped meandering wing 301 is connected to the top end cover 302 by welding; further, after connecting the above-mentioned M-shaped meandering wing 301, top end cover 302 and uniform air hole plate 303, a meandering wing inertial separation device is formed.

[0085] The bracket 402 and the bottom of the sedimentation cylinder 401 are connected by bolts, and the sedimentation shell 403 and the sedimentation cylinder 401 are fixed by welding; further, after connecting the above-mentioned sedimentation cylinder 401, bracket 402 and sedimentation shell 403, a gravity sedimentation unit is formed.

[0086] Further, the diverter fixing hole 2022 is connected to the inlet pipe 404 on the gravity sedimentation unit by welding, and the coalescence-cyclone fine separation device is fixed to the bracket 402 on the gravity sedimentation unit by bolts; the lower part of the uniform air hole plate 303 of the meandering wing inertial separation device is welded and sealed to the upper part of the sedimentation shell 403 of the gravity sedimentation unit; further, after connecting the above-mentioned coalescence-cyclone fine separation device, meandering wing inertial separation device and gravity sedimentation unit, a high-efficiency and rapid gas-liquid coalescence separation unit for a steam boiler is formed.

[0087] When the high-efficiency and rapid gas-liquid coalescence separation unit for steam boilers separates gas-liquid two-phase, it is divided into three periods: coalescence-cyclone fine separation period, gravity sedimentation period and meandering wing inertial separation period. When the gas-liquid coalescence separation unit is working, during the coalescence-cyclone fine separation period, the gas-liquid mixed medium first flows into the gas-liquid fine separation unit 1 from the inlet pipe 404 at high speed. In the first-stage variable pitch spiral flow channel 1032 of the top spiral section 103, due to the swirling effect of the spiral flow channel, the gas-liquid mixed medium rotates at high speed in the first-stage variable pitch spiral flow channel 1032 and generates centrifugal force. Due to the different gas-liquid densities, the centrifugal forces they receive are also different. The gas with a small density migrates towards the axis, and the small liquid droplets with a large density are thrown to the inner wall of the first-stage variable pitch spiral flow channel 1032, and the small liquid droplets are coalesced for the first time; then the gas-liquid mixed medium continues to rotate in the coalescence-cyclone section 101, the gas with a small density continues to migrate towards the axis, and the small liquid droplets with a large density continue to be thrown onto the droplet coalescence inclined plate 1011 on the inner wall of the coalescence-cyclone section 101 and collide and coalesce, completing the second coalescence of the small liquid droplets; the droplets after the first coalescence and the second coalescence will move along the droplet coalescence inclined plate 1011 towards the annular meandering wing outlet section 102 under the dual action of inertia and gravity. Due to the special structure of the annular meandering wing channel 1022, the small liquid droplets in the flow field collide again here, completing the third coalescence of the small liquid droplets. Finally, the liquids after the first coalescence, the second coalescence and the third coalescence will successively pass through the annular meandering wing channel 1022 and the liquid flow channel 2012 of the gas-liquid fine separation unit installation sleeve 201 and form a liquid seal in the annular meandering wing channel 1022 to prevent the gas from passing through, completing the preliminary separation of gas-liquid during the coalescence-cyclone fine separation period; the small liquid droplets that are not separated after the preliminary separation will continue to increase the swirling intensity in the second-stage variable pitch spiral flow channel 1052 of the overflow section 105 and enter the strong swirl fine separation section 104 with the gas, and complete the fourth coalescence of the small liquid droplets in the second-stage variable pitch spiral flow channel 1052. In the strong swirl fine separation section 104, the gas-liquid mixed medium is separated again by centrifugal force. Since the inner wall of the strong swirl fine separation section 104 is conical, the gas with a small density is affected by the conical inner wall and migrates towards the axis and is discharged successively through the main overflow pipe 1051 of the overflow section 105 and the top overflow pipe 1031 of the top spiral section 103, while the liquid droplets with a large density migrate towards the inner wall of the strong swirl fine separation section 104 and drain out from the bottom flow port at the lower part, thus completing the fine separation of gas-liquid during the coalescence-cyclone fine separation period.

[0088] After the coalescence-cyclone fine separation period, the gas-liquid mixed medium is divided into two parts: the underflow medium with less gas and more water and the overflow medium with more gas and less water. During the gravity sedimentation period, the gas-liquid separation of the underflow medium is carried out. Due to the different densities, the underflow medium is separated again at the bottom of the sedimentation cylinder 401 under the action of gravity and buoyancy. The gas with a small density migrates towards the upper part of the sedimentation cylinder and meets and mixes with the overflow medium after the coalescence-cyclone fine separation period, completing the gas-liquid separation of the underflow medium during the gravity sedimentation period.

[0089] The overflow medium after the coalescence-cyclone fine separation period is mixed with the gas separated during the gravity sedimentation period and then continues to migrate upward to the upper part of the gas-liquid coalescence separation unit. During the meandering wing inertial separation period, the mixed medium can evenly enter the meandering wing 301 through the action of the uniform orifice plate 303 of the meandering wing inertial separation unit 3 of the M shape. Among them, a small amount of rising small liquid droplets collide with the meandering wing 301 of the M shape due to their own inertia and coalesce into large liquid droplets, completing the fifth coalescence of the small liquid droplets, and then falling back to the bottom of the sedimentation cylinder 401 under the action of gravity. Finally, the liquids separated during the coalescence-cyclone fine separation period, the gravity sedimentation period, and the meandering wing inertial separation period are discharged from the liquid phase outlet pipe 4011 at the bottom; while the remaining pure gas will pass through the meandering wing inertial separation unit 3 of the M shape and be discharged from the gas phase outlet pipe 3021 of the top end cover 302 to obtain steam with sufficient dryness.

[0090] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the embodiments and enable other ordinary skilled persons in the technical field to understand the disclosed embodiments.

Claims

1. A gas-liquid coalescing separator for a steam boiler, characterized in that: It comprises a gas-liquid separation unit (1) and a gas-liquid separation unit installation sleeve (2); The gas-liquid fine separation unit is used for multiple coalescence and removal of small liquid droplets, and comprises a coalescence-cyclone section (101), an annular meandering wing outlet section (102), a top spiral section (103), a strong cyclone fine separation section (104) and an overflow section (105) which are connected in sequence; The annular meandering wing outlet section (102) is provided with a fixed wing (1021) and an annular meandering wing channel (1022); the coalescing-cyclone section (101) is provided with a fixed groove (1012); the annular meandering wing outlet section (102) and the coalescing-cyclone section (101) are aligned and pressed with the fixed wing (1021) and the fixed groove (1012), thereby achieving a fixed sealing effect; The overflow section (105) is provided with a main overflow pipe (1051) and a secondary variable pitch spiral flow channel (1052); the top spiral section (103) is provided with a top overflow pipe (1031) and a primary variable pitch spiral flow channel (1032); the main overflow pipe (1051) and the top overflow pipe (1031) are fixed by threaded connection, and the spiral flow channels on the top spiral section (103) and the overflow section (105) are variable pitch spiral flow channels; The annular meandering wing outlet section (102) is connected to the strong cyclone fine separation section (104) by means of threads; the secondary variable pitch spiral flow channel (1052) of the overflow section (105) and the primary variable pitch spiral flow channel (1032) of the top spiral section (103) are respectively connected to the annular meandering wing outlet section (102) and the coalescence-cyclone section (101) by means of interference fit; The gas-liquid separation unit installation sleeve comprises a gas-liquid separation unit installation sleeve (201), a gas-liquid separation unit installation sleeve cover (202) and an inlet diverter (203); The gas-liquid separation unit installation sleeve (201) is provided with a gas-liquid separation unit fixing hole (2011) and a liquid flow channel (212); the gas-liquid separation unit (1) is placed in the gas-liquid separation unit fixing hole (2011) to form a liquid flow channel (2012); the gas-liquid separation unit installation sleeve cover (202) is provided with a top overflow pipe fixing hole (2021) and a diverter fixing hole (2022); the gas-liquid separation unit installation sleeve (201) has openings at the bottom and inside; The inlet flow splitter (203) is connected to the flow splitter fixing hole (2022) of the gas-liquid separation unit installation cover (202) by interference fit, which plays a role in positioning and fixing; the flow splitter fixing hole (2022) is connected to the inlet pipe (404) by welding; The gas-liquid separation unit installation sleeve (201) and the gas-liquid separation unit installation sleeve cover (202) are connected by interference fit; The gas-liquid separation unit and the gas-liquid separation unit fixing hole (211) of the gas-liquid separation unit installation sleeve (201) are axially aligned and interference fitted, and the top spiral section (103) and the top overflow pipe fixing hole (221) of the gas-liquid separation unit installation sleeve cover (202) are axially aligned and interference fitted to form a seal; A plurality of sets of gas-liquid separation units connected in parallel are arranged in the gas-liquid separation unit installation sleeve; the gas-liquid mixed medium flowing in through the inlet pipe (404) is evenly divided by the inlet flow divider (203), ensuring that the flow rate flowing into each gas-liquid separation unit (1) is the same.

2. The gas-liquid coalescing separator for a steam boiler according to claim 1, characterized in that: The inner wall of the coalescence-cyclone section (101) is provided with a droplet coalescence inclined plate (1011) for causing the small droplets to collide with the plate surface and coalesce during the rotation process until they are discharged from the annular meandering wing outlet section (102); A protrusion structure is provided at the outlet of the annular meander wing outlet section, which is used to coalesce small droplets and achieve pre-separation, and to form a liquid seal in the annular meander wing channel (1022) to prevent gas from passing through; The inlet diverter (203) is a combination of a cylindrical bottom and a conical top. The inlet diverter (203) has six fan-shaped grooves from top to bottom, with a fan-shaped angle of 60 degrees, a conical top, and an arc transition at the bottom of the groove.

3. The gas-liquid coalescing separator for a steam boiler according to claim 2, characterized in that: The gas-liquid coalescing separator further comprises a gravity sedimentation unit (4); the gravity sedimentation unit is used to perform gas-liquid separation again on the underflow medium with less gas and more water; The gravity sedimentation unit (4) comprises a sedimentation cylinder (401), a bracket (402) and a sedimentation shell (403); A liquid phase outlet pipe (4011) is provided at the bottom of the sedimentation cylinder (401); the bracket (402) is located at the bottom of the sedimentation cylinder (401) and connected by bolts; An inlet pipe (404) is provided on the sedimentation shell (403); the inlet pipe (404) and the sedimentation shell (403) are integrally formed; The gas-liquid separation unit mounting sleeve (201) and the bracket (402) are fixedly connected by bolts.

4. The gas-liquid coalescing separator for a steam boiler according to claim 3, characterized in that: The gas-liquid coalescing separator further comprises an M-shaped meandering wing inertial separation unit (3); The M-shaped meander wing inertial separation unit (3) comprises an M-shaped meander wing (301), a top end cover (302) and an air-distributing hole plate (303); The M-shaped meander wing (301) is cylindrical and consists of a plurality of M-shaped plates (3011) and a cylinder (3012); The cylinder (3012) is divided into two identical half cylinders along the diameter; The M-shaped plate (3011) is fixed to the inner side of one half cylinder by welding at a gap of 5 mm, and then welded to the other half cylinder to form an M-shaped channel and an M-shaped meander wing (301); The M-shaped meandering wing (301) is welded and sealed to the upper portion of the uniform air hole plate (303); The top end cover (302) is provided with a gas phase outlet pipe (3021), and the top end cover (302) and the M-shaped meander wing (301) are welded and sealed; The uniform air hole plate (303) has uniform holes to ensure uniform flow of the gas phase; The uniform air hole plate (303) is located at the top of the sedimentation shell (403), and the uniform air hole plate (303) and the top of the sedimentation shell (403) are sealed by welding; the M-shaped plate (3011) is fixed to the inner side of a semi-cylinder by welding at a gap of 5 mm, and the angle of the M-shaped plate (3011) is 90°.

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