High-pressure circulating gas cooler and high-pressure circulating gas cooling system capable of being cleaned on line

Abstract

The invention provides a high-pressure circulating gas cooler and a high-pressure circulating gas cooling system capable of being cleaned on line. The high-pressure circulating gas cooler comprises a shell, an upper tube box and a lower tube box, and the shell is provided with a shell pass inlet and a shell pass outlet; the upper tube box is connected with the top face of the shell and provided with a tube pass inlet, and the lower tube box is connected with the bottom face of the shell and provided with a tube pass outlet. A high-pressure circulation gas distribution assembly is arranged in the upper tube box and comprises a cone diffusion piece, the top face of the cone diffusion piece is connected with the tube pass inlet, and the side face of the cone diffusion piece is connected with the upper tube box. According to the high-pressure circulating gas cooler, circulating gas can be diffused once and then uniformly distributed to all the heat exchange pipes through the conical diffusion piece arranged on the upper pipe box, so that the blocking speed of the heat exchange pipes in the high-pressure circulating gas cooler is delayed, and finally the cleaning period of the high-pressure circulating gas cooler can be prolonged.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure heat exchange technology, specifically relating to a high-pressure circulating gas cooler. Furthermore, this invention also relates to a high-pressure circulating gas cooling system that can be cleaned online. Background Technology

[0002] A high-pressure polyethylene (HPE) unit is an industrial device used to produce high-pressure polyethylene products. In this unit, the high-pressure circulating gas cooler is a crucial component, its function being to reduce the temperature of the high-pressure circulating gas (operating pressure of 20–50 MPaG, operating temperature of 40–300°C). During the temperature reduction process, wax dissolved in the high-pressure circulating gas precipitates and adheres to the inner wall of the heat exchange tubes. With continuous operation, the amount of precipitated wax increases, leading to reduced heat exchange efficiency, increased pressure drop in the heat exchanger, and in extreme cases, blockage of the heat exchange tubes. If no backup is provided, the unit must be shut down, and hot water or steam must be introduced into the shell side of the high-pressure circulating cooler to melt and drain the accumulated wax before the cooler can be used again, affecting the continuous operation cycle of the unit.

[0003] Conventional high-pressure circulating gas coolers are horizontal U-tube heat exchangers or shell-and-tube heat exchangers. They contain one or more bends in the heat exchange tubes and lack a backup platform, resulting in short cleaning cycles and frequent shutdowns for cleaning. The vertical single-pass structure, which has been adopted in recent years, avoids the problem of poor circulating gas flow in horizontal arrangements and also avoids the problem of easy clogging at one or more bends in the U-tubes and shell-and-tubes. However, it still cannot solve the problem of short cleaning cycles and the need for shutdowns for cleaning and dewaxing of high-pressure circulating gas coolers.

[0004] Therefore, developing a high-pressure circulating gas cooler that can solve the problems of severe scaling, short cleaning cycle, and short operating cycle in high-pressure circulating gas coolers has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and to provide a high-pressure circulating gas cooler and a high-pressure circulating gas cooling system that can be cleaned online.

[0006] One of the objectives of this invention is to provide a high-pressure circulating gas cooler, comprising:

[0007] The shell has a shell-side inlet and a shell-side outlet;

[0008] The upper tube box is connected to the top surface of the shell; the upper tube box is provided with a tube inlet;

[0009] The lower tube box is connected to the bottom surface of the housing; the lower tube box is provided with a tube outlet;

[0010] The upper pipe box is equipped with a high-pressure circulating gas distribution assembly, which includes a conical diffuser. The top surface of the conical diffuser is connected to the pipe inlet, and the side surface of the conical diffuser is connected to the upper pipe box.

[0011] In a preferred embodiment of the present invention

[0012] The housing is detachably connected to the upper pipe box; and / or

[0013] The housing is detachably connected to the lower tube box.

[0014] In a preferred embodiment of the present invention, the high-pressure circulating gas distribution assembly further includes a grid distributor, which is disposed below the conical diffuser and connected to the upper pipe box.

[0015] Preferably, the grid distributor is detachably connected to the upper pipe box;

[0016] More preferably, the height ratio of the conical diffuser to the height of the grid distributor is 1:1.2 to 2.

[0017] In a preferred embodiment of the present invention

[0018] The grid distributor includes multiple horizontal grids and multiple vertical grids;

[0019] Preferably, the horizontal grid comprises, from top to bottom, an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid; and / or, the vertical grid comprises, from top to bottom, an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid.

[0020] More preferably, the upper rectangular pyramid includes a first inclined plane and a second inclined plane, the included angle between the first inclined plane and the second inclined plane being 40 to 90°; and / or, the lower rectangular pyramid includes a third inclined plane and a fourth inclined plane, the included angle between the third inclined plane and the fourth inclined plane being 40 to 90°.

[0021] In a preferred embodiment of the present invention

[0022] The thickness of the horizontal grille is 6–30 mm, preferably 12–20 mm; and / or

[0023] The thickness of the vertical grille is 6-30mm, preferably 12-20mm;

[0024] Preferred,

[0025] The spacing between two adjacent transverse grilles is 12–50 mm, preferably 20–40 mm; and / or

[0026] The spacing between two adjacent vertical grilles is 12 to 50 mm, preferably 20 to 40 mm.

[0027] In a preferred embodiment of the present invention

[0028] The lower tube box is provided with a wax discharge port, the tube outlet is located on the side of the lower tube box, and the wax discharge port is located on the bottom surface of the lower tube box;

[0029] Preferably, the lower pipe box is provided with an outer jacket, which is connected to the heat medium inlet pipeline and the heat medium outlet pipeline;

[0030] More preferably, the ratio of the height of the lower tube box to the outer diameter of the lower tube box is 1:2 to 6.

[0031] In a preferred embodiment of the present invention

[0032] The conical diffuser includes an outer conical diffuser and an inner conical diffuser connected to each other. The inner diameter of the bottom surface of the outer conical diffuser is larger than the inner diameter of the bottom surface of the inner conical diffuser. The outer conical diffuser is sleeved on the outside of the inner conical diffuser.

[0033] Preferred,

[0034] The ratio of the inner diameter of the inner conical diffuser to the inner diameter of the outer conical diffuser is 0.5–1.0:1.0, more preferably 0.8–1.0:1.0; and / or

[0035] The height ratio of the inner conical diffuser to the outer conical diffuser is 0.5–1.0:1.0, more preferably 0.6–0.8:1.0; and / or

[0036] The ratio of the half-apex angle of the inner conical diffuser to that of the outer conical diffuser is 0.5 to 1.0:1.0, more preferably 0.8 to 1.0:1.0.

[0037] A second objective of this invention is to provide an online-cleanable high-pressure circulating gas cooling system, including the high-pressure circulating gas cooler described in one objective of this invention; multiple high-pressure circulating gas coolers are connected in series.

[0038] Each of the multiple high-pressure circulating gas coolers is provided with a tube-side inlet pipeline connected to the tube-side inlet, and each of the multiple tube-side inlet pipelines is connected to a tube-side inlet connecting pipeline; a tube-side three-way valve is provided at the connection position between the tube-side inlet pipeline and the tube-side inlet connecting pipeline;

[0039] Each of the multiple high-pressure circulating gas coolers is provided with a tube-side outlet pipeline connected to the tube-side outlet, and the other end of each of the multiple tube-side outlet pipelines is connected to the tube-side inlet connection pipeline.

[0040] In a preferred embodiment of the present invention

[0041] Each of the multiple high-pressure circulating gas coolers is provided with a refrigerant water inlet pipeline connected to the shell-side inlet, and the other end of each of the multiple refrigerant water inlet pipelines is connected to the shell-side inlet connecting pipeline; a shell-side three-way valve is provided at the connection position between the refrigerant water inlet pipeline and the shell-side inlet connecting pipeline;

[0042] Each of the multiple high-pressure circulating gas coolers is provided with a refrigerant return water outlet pipeline connected to the shell-side outlet, and the other end of each of the multiple refrigerant return water outlet pipelines is connected to the shell-side inlet connection pipeline.

[0043] Preferably, each of the multiple refrigerant return water outlet pipelines is equipped with a refrigerant return water outlet valve.

[0044] In a preferred embodiment of the present invention

[0045] Each of the aforementioned high-pressure circulating gas coolers is equipped with a hot water inlet pipeline connected to the shell-side inlet, and the other end of each of the aforementioned hot water inlet pipelines is connected to the main hot water inlet pipeline.

[0046] Each of the aforementioned high-pressure circulating gas coolers is provided with a hot water return outlet pipeline connected to the shell-side outlet, and the other end of each of the aforementioned hot water supply inlet pipelines is connected to the main hot water return outlet pipeline.

[0047] Preferred,

[0048] Each of the aforementioned hot water supply inlet pipelines is equipped with a hot water supply inlet valve; and / or

[0049] Hot water return outlet valves are installed on all of the aforementioned hot water return outlet pipelines;

[0050] More preferably,

[0051] Each of the aforementioned high-pressure circulating gas coolers is equipped with a wax discharge pipeline, and the other end of each of the aforementioned wax discharge pipelines is connected to a main wax discharge pipeline; each of the aforementioned wax discharge pipelines is equipped with a wax discharge outlet valve.

[0052] Compared with the prior art, the beneficial effects of the present invention are:

[0053] 1. The high-pressure circulating gas cooler of the present invention, through the conical diffuser and grid distributor arranged in the upper tube box, enables the circulating gas to undergo a first diffusion and a second homogenization distribution, and finally the circulating gas flow rate distributed to each heat exchange tube is more uniform, thereby slowing down the speed of blockage of the heat exchange tube and ultimately extending the cleaning cycle of the high-pressure circulating gas cooler.

[0054] 2. In the high-pressure circulating gas cooler of the present invention, both the horizontal and vertical grids in the grid distributor are flat steel with double-sharpened upper and lower sides. The function of the upper sharpening is to allow the circulating gas to move downwards along the sharpened surfaces, thereby preventing wax accumulation in the circulating gas on the grid distributor and ensuring that the grid distributor maintains a better uniform distribution effect, thus extending the cleaning cycle of the high-pressure circulating gas cooler and improving process efficiency. The function of the lower sharpening is to allow the circulating gas to diffuse to the periphery in each gas distribution channel of the grid distributor, thereby achieving a more uniform distribution effect. This solves the problems of severe scaling, short cleaning cycles, and short operating cycles in existing high-pressure circulating gas coolers.

[0055] 3. The high-pressure circulating gas cooler of the present invention has a high-pressure circulating gas distribution component with sufficient strength, which is suitable for high-pressure equipment (such as operating pressure of 20 to 50 MPaG), especially high-pressure equipment with large pressure drop, and has a long service life.

[0056] 4. The high-pressure circulating gas cooler of the present invention has its tube outlet located on the side of the lower tube box and its wax discharge port located on the bottom surface of the lower tube box. Firstly, this allows the lower tube box to simultaneously have a wax collection function. Secondly, it effectively shortens the length of the wax discharge path and reduces the heat transfer dead zone of wax from the high-pressure circulating gas cooler to the wax discharge tank. Thirdly, it reduces equipment investment and heat transfer medium consumption.

[0057] 5. The high-pressure circulating gas cooling system of the present invention is equipped with multiple high-pressure circulating gas coolers connected in series and capable of being switched off individually, which enables online cleaning of a single high-pressure circulating gas cooler and extends the continuous operation cycle of the entire system.

[0058] 6. The high-pressure circulating gas cooling system of the present invention can reduce the number of equipment required while ensuring the required number of high-pressure circulating gas cooling units for the process, thus greatly reducing equipment costs.

[0059] 7. The number of high-pressure circulating gas coolers connected in series in the high-pressure circulating gas cooling system of the present invention is not limited. Those skilled in the art can set it according to the process heat exchange requirements, which is suitable for promotion and application. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the high-pressure circulating gas cooler of the present invention;

[0061] Figure 2 This is a schematic diagram of the high-pressure circulating gas distribution component in the high-pressure circulating gas cooler of the present invention;

[0062] Figure 3 This is a top view of the grid distributor in the high-pressure circulating gas cooler of the present invention;

[0063] Figure 4This is a schematic diagram of the structure of a single grid in the high-pressure circulating gas cooler of the present invention;

[0064] Figure 5 This is a schematic diagram of another conical diffuser and upper tube box in the high-pressure circulating gas cooler of the present invention;

[0065] Figure 6 This is a schematic diagram of another conical diffuser in the high-pressure circulating gas cooler of the present invention;

[0066] Figure 7 This is a schematic diagram of the online-cleanable high-pressure circulating gas cooling system of the present invention;

[0067] In the figure, 1-upper pipe box; 2-grid distributor; 3-shell; 4-outer jacket; 5-lower pipe box; 6-conical diffuser; 61-outer conical diffuser; 62-inner conical diffuser;

[0068] E-1 - First high-pressure circulating gas cooler; E-2 - Second high-pressure circulating gas cooler; E-3 - Third high-pressure circulating gas cooler; E-4 - Fourth high-pressure circulating gas cooler;

[0069] XV011 - First-pass three-way valve; XV021 - Second-pass three-way valve; XV031 - Third-pass three-way valve; XV041 - Fourth-pass three-way valve;

[0070] XV012 - First shell-side three-way valve; XV022 - Second shell-side three-way valve; XV032 - Third shell-side three-way valve; XV042 - Fourth shell-side three-way valve;

[0071] V11 - First wax discharge outlet valve; V12 - First hot water supply inlet valve; V13 - First refrigerant return outlet valve; V14 - First hot water return outlet valve. Detailed Implementation

[0072] The present invention will now be described in further detail with reference to the accompanying drawings:

[0073] Example 1

[0074] like Figures 1-6 As shown, this invention provides a high-pressure circulating gas cooler, which is a vertical single-pass structure with its axis perpendicular to the horizontal plane. The high-pressure circulating gas cooler includes a housing 3, the top surface of which is connected to an upper tube box 1, and the bottom surface of which is connected to a lower tube box 5. Preferably, the top surface of the housing 3 is detachably connected to the upper tube box 1, and the bottom surface of the housing 3 is detachably connected to the lower tube box 5. Figure 1As shown, a bolted structure is provided between the top surface of the housing 3 and the upper tube box 1 to achieve a detachable connection. The top surface of the upper tube box 1 has a tube-side inlet, and the lower tube box 5 has a tube-side outlet. The side of the housing 3 has a shell-side inlet and a shell-side outlet, with the shell-side outlet having a greater vertical height than the shell-side inlet. Heat exchange tubes are installed inside the housing 3. The heat exchange tubes, shell-side inlet, and shell-side outlet are standard features of high-pressure circulating gas coolers and will not be described further here. Preferably, the tube-side inlet is coaxially arranged with the high-pressure circulating gas cooler.

[0075] The upper pipe box 1 is equipped with a high-pressure circulating gas distribution assembly, which includes a conical diffuser 6 arranged vertically and a grid distributor 2. The top surface of the conical diffuser 6 is connected to the pipe inlet, and the side surface of the conical diffuser 6 is connected to the upper pipe box 1. The grid distributor 2 is located below the conical diffuser 6, and its side surface is connected to the upper pipe box 1. The conical diffuser 6 is a hollow cone, and the grid distributor 2 is a cylindrical body. The height ratio of the conical diffuser 6 to the grid distributor 2 is 1:1.2 to 2, and the grid distributor 2 within this height range makes the circulating gas distribution more uniform. The grid distributor 2 is a cylindrical structure (a non-removable whole) welded together from multiple horizontal grids, multiple vertical grids, and its circumference. Gas distribution channels are formed between adjacent horizontal grids and adjacent vertical grids. These gas channels are connected to a conical diffuser 6 located above them and to a heat exchange tube located below them, allowing circulating gas originating from the conical diffuser 6 to enter the heat exchange tube after passing through the grid distributor 2. Preferably, the horizontal grids and the vertical grids are perpendicular to each other; more preferably, multiple horizontal grids and multiple vertical grids are equally spaced. Both the horizontal and vertical grids are cuboid in shape.

[0076] If the distributor uses the existing inner cone or inner extension tube structure, it will cause uneven distribution of circulating air flow in the center and edge heat exchange tubes. Specifically, the inner cone structure forces the peripheral airflow at the circulating air inlet to distribute to the peripheral heat exchange tubes. Although it considers the circulating air distribution in the outermost heat exchange tubes, it cannot take into account the circulating air distribution in other areas. Furthermore, this structure requires disassembling the upper tube box flange to remove the inner cone. The advantage of the inner extension tube structure is that it can be removed without disassembling the upper tube box flange, but its circulating air distribution effect is not as good as that of the inner cone.

[0077] In this invention, a conical diffuser 6 and a grid distributor 2 are arranged vertically. Circulating gas enters the conical diffuser 6 from the inlet of the tube side into the upper tube box 1. The circulating gas undergoes a first diffusion along the conical diffuser 6, spreading to the entire cylindrical cross-section of the grid distributor 2. However, at this point, the circulating gas on the entire cylindrical cross-section of the grid distributor 2 is not very uniform. After the first diffusion, the circulating gas moves downwards and enters the grid distributor 2. After entering the grid distributor 2, the circulating gas undergoes a second homogenization distribution, making the flow rate of circulating gas distributed to each heat exchange tube more uniform, thereby slowing down the rate of blockage in the heat exchange tubes and ultimately extending the cleaning cycle of the high-pressure circulating gas cooler.

[0078] In a preferred embodiment of the present invention, the conical diffuser 6 is provided with a conical-cased structure inside, that is, the conical-cased structure includes an outer conical diffuser 61 and an inner conical diffuser 62, wherein the inner diameter of the bottom surface of the outer conical diffuser 61 is larger than the inner diameter of the bottom surface of the inner conical diffuser 62, the outer conical diffuser 61 is sleeved on the inner conical diffuser 62, and the outer conical diffuser 61 and the inner conical diffuser 62 are coaxially arranged. The outer conical diffuser 61 and the inner conical diffuser 62 are fixedly connected and can be welded together. The outer conical diffuser 61 is connected to the upper pipe box 1, preferably in a detachable manner. For example, the outer conical diffuser 61 and the upper pipe box 1 are connected by a bolt structure to achieve a detachable connection between the two. When it is necessary to replace the conical-cased structure, the bolt structure between the outer conical diffuser 61 and the upper pipe box 1 can be removed, and the entire conical-cased structure can be taken out.

[0079] like Figure 5 As described above, since the outer conical diffuser 61 is fitted outside the inner conical diffuser 62 and the inner diameter of the bottom surface of the outer conical diffuser 61 is larger than that of the inner conical diffuser 62, an annular gap is formed between the outer conical diffuser 61 and the inner conical diffuser 62. Furthermore, the gas at the tube inlet is divided into two streams by this conical-within-a-conical structure; one stream enters the inner conical diffuser 62, and the other enters the annular gap between the outer conical diffuser 61 and the inner conical diffuser 62. Therefore, when the conical diffuser 6 has a conical-within-a-conical structure inside, the airflow at the tube inlet is forced to distribute towards the periphery and sub-periphery, further improving the problem of insufficient gas distribution at the periphery and making the gas distribution more uniform at the bottom surface of the conical diffuser 6.

[0080] In a preferred embodiment of the present invention, such as Figure 6As shown, the ratio of the inner diameters of the inner conical diffuser 62 and the outer conical diffuser 61 is 0.5–1.0:1.0, preferably 0.8–1.0:1.0; specifically in this embodiment, the range of D1 / D2 is 0.5–1.0:1.0, preferably 0.8–1.0:1.0. In a preferred embodiment of the present invention, the ratio of the heights of the inner conical diffuser 62 and the outer conical diffuser 61 is 0.5–1.0:1.0, preferably 0.6–0.8:1.0; specifically in this embodiment, the range of H4 / H3 is 0.5–1.0:1.0, preferably 0.6–0.8:1.0. In a preferred embodiment of the present invention, the ratio of the half-apex angles of the inner cone diffuser 62 and the outer cone diffuser 61 is 0.5 to 1.0:1.0, preferably 0.8 to 1.0:1.0; specifically in this embodiment, the range of α3 / α2 is 0.5 to 1.0:1.0, preferably 0.8 to 1.0:1.0.

[0081] In a preferred embodiment of the present invention, both the horizontal and vertical grilles are flat steel bars with double-sharpened upper and lower sides. For example... Figure 4 As shown, the angle between the upper and lower double-sided tapering of the horizontal and vertical grilles is α1. The function of the upper tapering is to allow the circulating gas to move downwards along the tapered surface, thereby preventing wax in the circulating gas from accumulating on the grille distributor 2, so that the grille distributor 2 can always maintain a better uniform distribution effect, thereby extending the cleaning cycle of the high-pressure circulating gas cooler. The function of the lower tapering is to allow the circulating gas to diffuse to the periphery in each gas distribution channel of the grille distributor 2, thereby achieving a more uniform distribution effect.

[0082] The following details the description of "both the horizontal and vertical grids are flat steel bars with double-sharpened upper and lower sides." The horizontal grid, from top to bottom, consists of an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid. The upper rectangular pyramid has a vertex at its top, two sets of opposing triangles on its sides, and a rectangle on its base (with the same dimensions as the top surface of the cuboid). The total area of ​​the first set of opposing triangles is greater than the total area of ​​the second set. For clarity, these triangles are referred to as the first inclined plane and the second inclined plane. Therefore, the aforementioned "angle α1 of the double-sharpened upper side" is the included angle between the first and second inclined planes. The lower rectangular pyramid has a rectangle on its top surface (with the same dimensions as the top surface of the cuboid), two sets of opposing triangles on its sides, and a vertex at its bottom. The total area of ​​the third set of opposing triangles is greater than the total area of ​​the fourth set. For clarity, these triangles are referred to as the third inclined plane and the fourth inclined plane. The vertical grid also consists of an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid, from top to bottom, which will not be described in detail here.

[0083] In a preferred embodiment of the present invention, in the upper rectangular pyramid of the horizontal and vertical grids, the included angle between the first and second inclined surfaces is 40–90°, preferably 40–60°, to further prevent wax in the circulating gas from accumulating on the grid distributor 2. In the lower rectangular pyramid of the horizontal and vertical grids, the included angle between the third and fourth inclined surfaces is 40–90°, preferably 40–60°, to further increase the uniformity of the circulating gas distribution by the grid distributor 2.

[0084] In a preferred embodiment of the present invention, the thickness of the horizontal and vertical grids in the grid distributor 2 is 6–30 mm, preferably 12–20 mm, so that the grid distributor 2 formed by it has sufficient strength and is suitable for high-pressure equipment (operating pressure of 20–50 MPaG), especially high-pressure equipment with large pressure drop. Specifically, in this embodiment, as follows... Figure 4 As shown, the thickness T of the grid ranges from 6 to 30 mm, preferably from 12 to 20 mm.

[0085] In a preferred embodiment of the present invention, the spacing between two adjacent horizontal grilles in the grille distributor 2 is 12-50 mm, preferably 20-40 mm; similarly, the spacing between two adjacent vertical grilles is 12-50 mm, preferably 20-40 mm. This arrangement ensures that the grille distributor 2 has sufficient strength, making it suitable for high-pressure equipment, especially high-pressure equipment with large pressure drops, and further increases the uniformity of the distribution of circulating air by the grille distributor 2. Specifically, in this embodiment, as... Figure 3 As shown, the grid spacing B ranges from 12 to 50 mm, preferably from 20 to 40 mm.

[0086] In a preferred embodiment of the present invention, the grid distributor 2 is detachably connected to the upper pipe box 1. For example, the upper pipe box 1 is provided with a connector, which is connected to the outer peripheral surface of the grid distributor 2 via a bolt structure. As mentioned above, "the top surface of the housing 3 is detachably connected to the upper pipe box 1," therefore, when the grid distributor 2 needs to be replaced, firstly, the bolt structure between the housing 3 and the upper pipe box 1 is removed, revealing the grid distributor 2 located inside the upper pipe box 1. Then, the bolt structure between the grid distributor 2 and the upper pipe box 1 is removed, thus allowing the grid distributor 2 to be replaced.

[0087] In a preferred embodiment of the present invention, the outer diameter of the heat exchange tube is 14–32 mm, preferably 18–25 mm; the wall thickness of the heat exchange tube is 2.5–4.5 mm, preferably 3.0–4.0 mm; the length of the heat exchange tube is 5–15 m, preferably 10–14 m; and the flow velocity of the high-pressure circulating gas inside the heat exchange tube is in the range of 0.3–2.0 m / s, preferably 0.4–1.0 m / s. This configuration achieves a better heat exchange effect.

[0088] The lower tube box 5 is provided with a tube-side outlet and a wax discharge port. Preferably, the tube-side outlet is located on the side of the lower tube box 5, and the wax discharge port is located on the bottom surface of the lower tube box 5, which can be connected to an external wax discharge tank. This configuration has the following advantages: firstly, the lower tube box 5 also has a wax collection function; secondly, it effectively shortens the length of the wax discharge path, reducing the heat transfer dead zone of wax from the high-pressure circulating gas cooler to the wax discharge tank; and thirdly, it reduces equipment investment and heat transfer medium consumption.

[0089] In a preferred embodiment of the present invention, an outer jacket 4 is provided on the outer side of the lower pipe box 5, and the outer jacket 4 is connected to the heat medium inlet pipeline and the heat medium outlet pipeline to facilitate the discharge of wax. In a preferred embodiment of the present invention, the ratio of the height of the lower pipe box 5 to the outer diameter of the lower pipe box 5 is 1:2 to 6, preferably 1:2 to 4, where the outer diameter of the lower pipe box 5 refers to the minimum outer diameter. It should be noted that a shut-off valve is provided between the wax discharge port of the high-pressure circulating gas cooler and the wax discharge tank. Therefore, the wax in the lower pipe box 5 is not continuously discharged to the wax discharge pipe, but is intermittently discharged to the low wax discharge tank by controlling the shut-off valve. When the ratio of the height of the lower pipe box 5 to the outer diameter of the lower pipe box 5 is within a preset range, the lower pipe box 5 has sufficient space to accommodate the discharged wax, which is more conducive to the periodic discharge of wax. When the ratio of the height of the lower tube box 5 to the outer diameter of the lower tube box 5 is not within the preset range, it will either cause insufficient capacity of the lower tube box 5 and affect the tube outlet located on the side of the lower tube box 5, or increase the burden on the outer jacket 4.

[0090] Example 2

[0091] like Figure 7As shown, this invention provides an online-cleanable high-pressure circulating gas cooling system, comprising multiple high-pressure circulating gas coolers arranged in series. Each of the multiple high-pressure circulating gas coolers has a tube-side inlet pipeline connected to its tube-side inlet, and each of the multiple tube-side inlet pipelines is connected to a tube-side inlet connecting pipeline; a tube-side three-way valve is provided at each connection point. The tube-side inlet pipeline of the most upstream high-pressure circulating gas cooler is connected to the main high-pressure circulating gas inlet pipeline. Specifically, the tube-side inlet connecting pipeline and the tube-side inlet pipeline of the most upstream high-pressure circulating gas cooler are all connected to the main high-pressure circulating gas inlet pipeline; a tube-side three-way valve is provided at the intersection of these three connections. A tube-side three-way valve is also provided at the connection point between the tube-side inlet connecting pipeline and the tube-side inlet pipeline of a non-most upstream high-pressure circulating gas cooler. Each of the multiple high-pressure circulating gas coolers has a tube-side outlet pipeline. The other end of each of the multiple tube-side outlet pipelines is connected to the tube-side inlet connecting pipeline.

[0092] Each of the aforementioned high-pressure circulating gas coolers is equipped with a refrigerant feedwater inlet pipeline connected to the shell-side inlet. The other end of each of these refrigerant feedwater inlet pipelines is connected to a shell-side inlet connecting pipeline; a shell-side three-way valve is installed at each connection point. The refrigerant feedwater inlet pipeline of the most downstream high-pressure circulating gas cooler is connected to the main refrigerant feedwater inlet pipeline, and the refrigerant feedwater inlet pipeline of the most upstream high-pressure circulating gas cooler is connected to the main refrigerant return water outlet pipeline. Specifically, the shell-side inlet connecting pipeline and the refrigerant feedwater inlet pipeline of the most downstream high-pressure circulating gas cooler are both connected to the main refrigerant feedwater inlet pipeline; a shell-side three-way valve is installed at the junction of these three pipelines. The shell-side inlet connecting pipeline and the refrigerant feedwater inlet pipeline of the most upstream high-pressure circulating gas cooler are both connected to the main refrigerant return water outlet pipeline; a shell-side three-way valve is installed at the junction of these three pipelines. A shell-side three-way valve is also installed at the connection point between the shell-side inlet connecting pipeline and the refrigerant feedwater inlet pipelines of the other high-pressure circulating gas coolers. Each of the aforementioned high-pressure circulating gas coolers is equipped with a refrigerant return water outlet pipeline. The other end of each refrigerant return water outlet pipeline is connected to the shell-side inlet connection pipeline. Each of the aforementioned refrigerant return water outlet pipelines is equipped with a refrigerant return water outlet valve.

[0093] Each of the aforementioned high-pressure circulating gas coolers is equipped with a hot water supply inlet pipeline connected to the shell-side inlet to allow hot water to enter the high-pressure circulating gas cooler for cleaning. The other end of each of the aforementioned hot water supply inlet pipelines is connected to a main hot water supply inlet pipeline. Each of the aforementioned hot water supply inlet pipelines is equipped with a hot water supply inlet valve. Each of the aforementioned high-pressure circulating gas coolers is also equipped with a hot water return outlet pipeline connected to the shell-side outlet to allow the heat-exchanged hot water to exit the high-pressure circulating gas cooler. The other end of each of the aforementioned hot water supply inlet pipelines is connected to a main hot water return outlet pipeline. Each of the aforementioned hot water return outlet pipelines is equipped with a hot water return outlet valve. Each of the aforementioned high-pressure circulating gas coolers is also equipped with a wax discharge pipeline connected to a wax discharge port to discharge the cleaned wax. The other end of each of the aforementioned wax discharge pipelines is connected to a main wax discharge pipeline. Each of the aforementioned wax discharge pipelines is equipped with a wax discharge outlet valve.

[0094] The following is a schematic description of a high-pressure circulating gas cooling system that can be cleaned online, consisting of four high-pressure circulating gas coolers. For ease of distinction, the four high-pressure circulating gas coolers are named as follows: First High-Pressure Circulating Gas Cooler E-1 (upstream), Second High-Pressure Circulating Gas Cooler E-2, Third High-Pressure Circulating Gas Cooler E-3, and Fourth High-Pressure Circulating Gas Cooler E-4 (downstream). As mentioned in Example 1, the high-pressure circulating gas cooler includes a tube-side inlet located on the top surface of the upper tube box 1, a shell-side outlet and shell-side inlet located on the shell 3, and a tube-side outlet located on the side of the lower tube box 5. Therefore, the first high-pressure circulating gas cooler E-1 is provided with a first tube-side inlet, a first tube-side outlet, a first shell-side inlet, and a first shell-side outlet; the second high-pressure circulating gas cooler E-2 is provided with a second tube-side inlet, a second tube-side outlet, a second shell-side inlet, and a second shell-side outlet; the third high-pressure circulating gas cooler E-3 is provided with a third tube-side inlet, a third tube-side outlet, a third shell-side inlet, and a third shell-side outlet; and the fourth high-pressure circulating gas cooler E-4 is provided with a fourth tube-side inlet, a fourth tube-side outlet, a fourth shell-side inlet, and a fourth shell-side outlet.

[0095] The first, second, third, and fourth pipe passes each have their own inlet pipelines. The other ends of each inlet pipeline are connected to a pipe pass inlet connection pipeline. Specifically, the first inlet pipeline is connected to one end of the pipe pass inlet connection pipeline, while the second, third, and fourth inlet pipelines are all connected to a non-end portion of the pipe pass inlet connection pipeline.

[0096] At the connection point between the first-pass inlet pipeline and the first-pass inlet connecting pipeline, a high-pressure circulating gas main inlet pipeline is also provided. At the intersection of the three pipelines, a first-pass three-way valve XV011 is provided to connect the high-pressure circulating gas main inlet pipeline to the first-pass inlet pipeline, or to connect the high-pressure circulating gas main inlet pipeline to the first-pass inlet pipeline. At the connection point between the second-pass inlet pipeline and the first-pass inlet connecting pipeline, a second-pass three-way valve XV021 is provided to connect the downstream first-pass inlet connecting pipeline to the second-pass inlet pipeline, or to connect the upstream first-pass inlet connecting pipeline at that location to the downstream first-pass inlet connecting pipeline. At the connection point between the third-pass inlet pipeline and the first-pass inlet connecting pipeline, a third-pass three-way valve XV031 is provided to connect the downstream first-pass inlet connecting pipeline to the third-pass inlet pipeline, or to connect the upstream first-pass inlet connecting pipeline at that location to the downstream first-pass inlet connecting pipeline. At the connection point between the fourth-pass inlet pipeline and the fourth-pass inlet connecting pipeline, a fourth-pass three-way valve XV041 is provided to connect the downstream inlet connecting pipeline with the fourth-pass inlet pipeline, or to connect the upstream inlet connecting pipeline with the downstream inlet connecting pipeline at this location.

[0097] The first, second, third, and fourth pass outlets are each equipped with their own outlet pipelines. The other end of each outlet pipeline is connected to the inlet pipeline. Figure 7 As shown, the first-pass outlet pipeline is connected to the inlet connection pipeline between the first-pass three-way valve XV011 and the second-pass three-way valve XV021; the second-pass outlet pipeline is connected to the inlet connection pipeline between the second-pass three-way valve XV021 and the third-pass three-way valve XV031; the third-pass outlet pipeline is connected to the inlet connection pipeline between the third-pass three-way valve XV031 and the fourth-pass three-way valve XV041; and the fourth-pass outlet pipeline is connected to the inlet connection pipeline downstream of the fourth-pass three-way valve XV041.

[0098] The first, second, third, and fourth shell-side inlets are each equipped with a corresponding inlet pipeline. The other ends of these pipelines are connected to the corresponding refrigerant supply water inlet pipelines. All four inlet pipelines are connected to the shell-side inlet connection pipelines. Specifically, the first and fourth refrigerant supply water inlet pipelines are connected to one end of each shell-side inlet connection pipeline, while the second and third refrigerant supply water inlet pipelines are connected to the non-end ends of the shell-side inlet connection pipelines.

[0099] At the connection point between the first refrigerant supply water inlet line and the shell-side inlet connection line, a refrigerant return water main outlet line is also provided. At the intersection of the three lines, a first shell-side three-way valve XV012 is provided to connect the shell-side inlet connection line to the first refrigerant supply water inlet line, or to connect the shell-side inlet connection line to the refrigerant return water main outlet line. At the connection point between the second refrigerant supply water inlet line and the shell-side inlet connection line, a second shell-side three-way valve XV022 is provided to connect the upstream shell-side inlet connection line to the second refrigerant supply water inlet line, or to connect the upstream shell-side inlet connection line at that location to the downstream shell-side inlet connection line. At the connection point between the third refrigerant supply water inlet line and the shell-side inlet connection line, a third shell-side three-way valve XV032 is provided to connect the upstream shell-side inlet connection line to the third refrigerant supply water inlet line, or to connect the upstream shell-side inlet connection line at that location to the downstream shell-side inlet connection line. At the connection point between the fourth refrigerant supply water inlet pipeline and the shell-side inlet connection pipeline, a main refrigerant supply water inlet pipeline is also provided. At the intersection of the three pipelines, a fourth shell-side three-way valve XV042 is provided to connect the main refrigerant supply water inlet pipeline with the fourth refrigerant supply water inlet pipeline, or to connect the main refrigerant supply water inlet pipeline with the shell-side inlet connection pipeline.

[0100] The first, second, third, and fourth shell-side outlets are respectively equipped with their own shell-side outlet pipelines. The other ends of these pipelines are connected to the first, second, third, and fourth refrigerant return water outlet pipelines, respectively. The other end of the first refrigerant return water outlet pipeline is connected to the main refrigerant return water outlet pipeline, and the other ends of the second, third, and fourth refrigerant return water outlet pipelines are all connected to the shell-side inlet connection pipeline. Figure 7As shown, the fourth refrigerant return water outlet pipeline is connected to the shell-side inlet connection pipeline between the fourth shell-side three-way valve XV042 and the third shell-side three-way valve XV032; the third refrigerant return water outlet pipeline is connected to the shell-side inlet connection pipeline between the third shell-side three-way valve XV032 and the second shell-side three-way valve XV022; the second refrigerant return water outlet pipeline is connected to the shell-side inlet connection pipeline between the second shell-side three-way valve XV022 and the first shell-side three-way valve XV012; and the first refrigerant return water outlet pipeline is connected to the main refrigerant return water outlet pipeline.

[0101] The first, second, third, and fourth refrigerant return water outlet pipelines are equipped with a first refrigerant return water outlet valve V13, a second refrigerant return water outlet valve, a third refrigerant return water outlet valve, and a fourth refrigerant return water outlet valve, respectively. By controlling the second, third, and fourth refrigerant return water outlet valves, the refrigerant return water in the second, third, and fourth high-pressure circulating air coolers E-2, E-3, and E-4 can be channeled into the shell-side inlet connection pipeline and then into the upstream high-pressure circulating air cooler; by controlling the first refrigerant return water outlet valve V13, the refrigerant return water in the first high-pressure circulating air cooler E-1 can be channeled into the main refrigerant return water outlet pipeline.

[0102] The other ends of the first, second, third, and fourth shell-side inlet pipelines are respectively connected to the first, second, third, and fourth hot water supply inlet pipelines. The other ends of the first, second, third, and fourth hot water supply inlet pipelines are all connected to the main hot water supply inlet pipeline.

[0103] The first, second, third, and fourth hot water inlet pipelines are equipped with a first hot water inlet valve V12, a second hot water inlet valve, a third hot water inlet valve, and a fourth hot water inlet valve, respectively, to control whether the hot water in the main hot water inlet pipeline enters the first high-pressure circulating air cooler E-1, the second high-pressure circulating air cooler E-2, the third high-pressure circulating air cooler E-3, and the fourth high-pressure circulating air cooler E-4.

[0104] The other ends of the first, second, third, and fourth shell-side outlet pipelines are also connected to the first, second, third, and fourth hot water return outlet pipelines, respectively. The other ends of the first, second, third, and fourth hot water return outlet pipelines are all connected to the main hot water return outlet pipeline.

[0105] The first hot water return outlet pipeline, the second hot water return outlet pipeline, the third hot water return outlet pipeline, and the fourth hot water return outlet pipeline are respectively equipped with a first hot water return outlet valve V14, a second hot water return outlet valve, a third hot water return outlet valve, and a fourth hot water return outlet valve to control whether the hot water return water in the first high-pressure circulating air cooler E-1, the second high-pressure circulating air cooler E-2, the third high-pressure circulating air cooler E-3, and the fourth high-pressure circulating air cooler E-4 enters the first hot water return outlet pipeline, the second hot water return outlet pipeline, the third hot water return outlet pipeline, and the fourth hot water return outlet pipeline.

[0106] As mentioned in Example 1, the high-pressure circulating gas cooler includes a wax discharge port located on the bottom surface of the lower pipe box 5. Therefore, the first high-pressure circulating gas cooler E-1 has a first wax discharge port, the second high-pressure circulating gas cooler E-2 has a second wax discharge port, the third high-pressure circulating gas cooler E-3 has a third wax discharge port, and the fourth high-pressure circulating gas cooler E-4 has a fourth wax discharge port. The first, second, third, and fourth wax discharge ports are respectively connected to the first, second, third, and fourth wax discharge pipelines. The other ends of the first, second, third, and fourth wax discharge pipelines are all connected to the main wax discharge pipeline.

[0107] The first wax discharge pipeline, the second wax discharge pipeline, the third wax discharge pipeline, and the fourth wax discharge pipeline are respectively equipped with a first wax discharge outlet valve V11, a second wax discharge outlet valve, a third wax discharge outlet valve, and a fourth wax discharge outlet valve to control whether the wax in the first high-pressure circulating gas cooler E-1, the second high-pressure circulating gas cooler E-2, the third high-pressure circulating gas cooler E-3, and the fourth high-pressure circulating gas cooler E-4 enters the first wax discharge pipeline, the second wax discharge pipeline, the third wax discharge pipeline, and the fourth wax discharge pipeline.

[0108] The following is a schematic description of the online cleaning method for the aforementioned high-pressure circulating gas cooling system (assuming it is applied to a process requiring three high-pressure circulating gas coolers, with the fourth high-pressure circulating gas cooler E-4 in standby mode). The online-cleanable high-pressure circulating gas cooling system of this invention is applied to a high-pressure polyethylene plant, with an operating pressure of 15–50 MPa, preferably 20–35 MPa, and even more preferably 25–30 MPa. The process gas inlet temperature is 100–300°C, preferably 150–250°C, and even more preferably 180–220°C. The process gas outlet temperature is 20–50°C, which can be determined according to process requirements. The online cleaning method for the high-pressure circulating gas cooling system includes the following steps:

[0109] S1: The first-pass three-way valve XV011, the second-pass three-way valve XV021, and the third-pass three-way valve XV031 are respectively in the first-pass inlet pipeline valve position, the second-pass inlet pipeline valve position, and the third-pass inlet pipeline valve position; the fourth-pass three-way valve XV041 is in the inlet connection pipeline valve position. The first-pass three-way valve XV012, the second-pass three-way valve XV022, and the third-pass three-way valve XV032 are respectively in the first-pass refrigerant supply water inlet pipeline valve position, the second-pass refrigerant supply water inlet pipeline valve position, and the third-pass refrigerant supply water inlet pipeline valve position; the fourth-pass three-way valve XV042 is in the shell-pass inlet connection pipeline valve position. Open the first refrigerant return water outlet valve, the second refrigerant return water outlet valve, and the third refrigerant return water outlet valve; close the fourth refrigerant return water outlet valve, all hot water supply water inlet valves, all hot water return water outlet valves, and all wax discharge outlet valves.

[0110] Refrigerant feedwater enters the third high-pressure circulating gas cooler E-3, and after heat exchange, it exits to the shell-side inlet connection line, then enters the second high-pressure circulating gas cooler E-2, and after heat exchange, it exits to the shell-side inlet connection line, then enters the first high-pressure circulating gas cooler E-1, and after heat exchange, it exits to the refrigerant return water main outlet line. High-pressure circulating gas enters the first high-pressure circulating gas cooler E-1, and after heat exchange, it exits to the tube-side inlet connection line, then enters the second high-pressure circulating gas cooler E-2, and after heat exchange, it exits to the tube-side inlet connection line, then enters the third high-pressure circulating gas cooler E-3, and after heat exchange, it exits to the tube-side inlet connection line.

[0111] S2: Assuming the first high-pressure circulating gas cooler E-1 needs to be shut down for cleaning, adjust the second-pass three-way valve XV021, the third-pass three-way valve XV031, and the fourth-pass three-way valve XV041 to the second-pass inlet pipeline valve position, the third-pass inlet pipeline valve position, and the fourth-pass inlet pipeline valve position, respectively; adjust the first-pass three-way valve XV011 to the inlet connection pipeline valve position. Adjust the second-pass shell-side three-way valve XV022, the third-pass shell-side three-way valve XV032, and the fourth-pass shell-side three-way valve XV042 to the second-pass refrigerant water inlet pipeline valve position, the third-pass refrigerant water inlet pipeline valve position, and the fourth-pass refrigerant water inlet pipeline valve position, respectively; adjust the first-pass shell-side three-way valve XV012 to the shell-side inlet connection pipeline valve position. Open the second, third, and fourth refrigerant water return outlet valves, and close the first refrigerant water return outlet valve. Open the first hot water supply inlet valve and the first hot water return outlet valve. Hot water enters the first high-pressure circulating air cooler E-1. Under the action of the hot water, the wax adhering to the inner wall of the heat exchanger melts and falls into the lower pipe box 5. The heat-exchanged hot water is then transferred to the main hot water return outlet pipeline. Open the first wax discharge outlet valve V11 to discharge the wax remaining in the lower pipe box 5. This high-pressure circulating air cooler will be put back online when the other high-pressure circulating air cooler needs cleaning.

[0112] Refrigerant feedwater enters the fourth high-pressure circulating gas cooler E-4, and after heat exchange, it exits to the shell-side inlet connection line, then enters the third high-pressure circulating gas cooler E-3, and after heat exchange, exits to the tube-side inlet connection line, then enters the second high-pressure circulating gas cooler E-2, and after heat exchange, exits to the refrigerant return water main outlet line. High-pressure circulating gas enters the second high-pressure circulating gas cooler E-2, and after heat exchange, exits to the tube-side inlet connection line, then enters the third high-pressure circulating gas cooler E-3, and after heat exchange, exits to the tube-side inlet connection line, then enters the fourth high-pressure circulating gas cooler E-4, and after heat exchange, exits to the tube-side inlet connection line. This configuration ensures that the required number of high-pressure circulating gas coolers are always in operation, without affecting continuous production of the unit.

[0113] It should be noted that in steps S1 and S2, the heat medium inlet pipeline of the outer jacket 4 of each high-pressure circulating gas cooler in the high-pressure circulating gas cooling system can be continuously supplied, even if one or more high-pressure circulating gas coolers are not in the dewaxing state for shutdown cleaning. For example, in the above embodiment, the first high-pressure circulating gas cooler E-1 needs to be shut down for cleaning, and heat medium is continuously supplied to its outer jacket 4 through the heat medium inlet pipeline to further discharge the wax remaining in the lower pipe box 5. At the same time, heat medium is also continuously supplied to the outer jacket 4 of the second high-pressure circulating gas cooler E-2, the third high-pressure circulating gas cooler E-3, and the fourth high-pressure circulating gas cooler E-4 through the heat medium inlet pipeline.

[0114] The high-pressure circulating gas cooling system of the present invention, which can be cleaned online, sets up multiple high-pressure circulating gas coolers connected in series and can be cut off one by one. That is, when a single high-pressure circulating gas cooler needs to be dewaxed, it can be cut off from the system independently for dewaxing without affecting the continuous use of the entire system, thus solving the problem that the high-pressure circulating gas cooling system in the prior art cannot operate continuously.

[0115] The online-cleanable high-pressure circulating gas cooling system of the present invention requires fewer equipment units while ensuring the required number of high-pressure circulating gas coolers for the process. Specifically, existing technologies generally use a one-in-one-backup configuration. Taking this embodiment as an example, the process requires 3 high-pressure circulating gas coolers. If a conventional one-in-one-backup configuration is adopted, a total of 6 high-pressure circulating gas coolers are needed. However, with the online-cleanable high-pressure circulating gas cooling system of the present invention, only 4 high-pressure circulating gas coolers are required, saving approximately 50% in equipment investment. Furthermore, the number of high-pressure circulating gas coolers connected in series is not limited and can be determined according to the process heat exchange requirements.

[0116] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0117] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0118] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A high-pressure circulating gas cooler, characterized in that, include: The shell has a shell-side inlet and a shell-side outlet; The upper tube box is connected to the top surface of the shell; the upper tube box is provided with a tube inlet; The lower tube box is connected to the bottom surface of the housing; the lower tube box is provided with a tube outlet; The upper pipe box is equipped with a high-pressure circulating gas distribution assembly, which includes a conical diffuser. The top surface of the conical diffuser is connected to the pipe inlet, and the side surface of the conical diffuser is connected to the upper pipe box.

2. The high-pressure circulating gas cooler according to claim 1, characterized in that, The housing is detachably connected to the upper pipe box; and / or The housing is detachably connected to the lower tube box.

3. The high-pressure circulating gas cooler according to claim 1, characterized in that, The high-pressure circulating gas distribution assembly also includes a grid distributor, which is located below the conical diffuser and connected to the upper pipe box. Preferably, the grid distributor is detachably connected to the upper pipe box; More preferably, the height ratio of the conical diffuser to the height of the grid distributor is 1:1.2 to 2.

4. The high-pressure circulating gas cooler according to claim 3, characterized in that, The grid distributor includes multiple horizontal grids and multiple vertical grids; Preferably, the horizontal grid comprises, from top to bottom, an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid; and / or, the vertical grid comprises, from top to bottom, an upper rectangular pyramid, a cuboid, and a lower rectangular pyramid. More preferably, the upper rectangular pyramid includes a first inclined plane and a second inclined plane, the included angle between the first inclined plane and the second inclined plane being 40 to 90°; and / or, the lower rectangular pyramid includes a third inclined plane and a fourth inclined plane, the included angle between the third inclined plane and the fourth inclined plane being 40 to 90°.

5. The high-pressure circulating gas cooler according to claim 4, characterized in that, The thickness of the horizontal grille is 6–30 mm, preferably 12–20 mm; and / or The thickness of the vertical grille is 6-30mm, preferably 12-20mm; Preferred, The spacing between two adjacent transverse grilles is 12–50 mm, preferably 20–40 mm; and / or The spacing between two adjacent vertical grilles is 12 to 50 mm, preferably 20 to 40 mm.

6. The high-pressure circulating gas cooler according to claim 1, characterized in that, The lower tube box is provided with a wax discharge port, the tube outlet is located on the side of the lower tube box, and the wax discharge port is located on the bottom surface of the lower tube box; Preferably, the lower pipe box is provided with an outer jacket, which is connected to the heat medium inlet pipeline and the heat medium outlet pipeline; More preferably, the ratio of the height of the lower tube box to the outer diameter of the lower tube box is 1:2 to 6.

7. The high-pressure circulating gas cooler according to claim 1, characterized in that, The conical diffuser includes an outer conical diffuser and an inner conical diffuser connected to each other. The inner diameter of the bottom surface of the outer conical diffuser is larger than the inner diameter of the bottom surface of the inner conical diffuser. The outer conical diffuser is sleeved on the outside of the inner conical diffuser. Preferred, The ratio of the inner diameter of the inner conical diffuser to the inner diameter of the outer conical diffuser is 0.5–1.0:1.0, more preferably 0.8–1.0:1.0; and / or The height ratio of the inner conical diffuser to the outer conical diffuser is 0.5–1.0:1.0, more preferably 0.6–0.8:1.0; and / or The ratio of the half-apex angle of the inner conical diffuser to that of the outer conical diffuser is 0.5 to 1.0:1.0, more preferably 0.8 to 1.0:1.

0.

8. A high-pressure circulating gas cooling system that can be cleaned online, characterized in that, Includes multiple high-pressure circulating gas coolers as described in any one of claims 1 to 7; multiple high-pressure circulating gas coolers are arranged in series; Each of the multiple high-pressure circulating gas coolers is provided with a tube-side inlet pipeline connected to the tube-side inlet, and each of the multiple tube-side inlet pipelines is connected to a tube-side inlet connecting pipeline; a tube-side three-way valve is provided at the connection position between the tube-side inlet pipeline and the tube-side inlet connecting pipeline; Each of the multiple high-pressure circulating gas coolers is provided with a tube-side outlet pipeline connected to the tube-side outlet, and the other end of each of the multiple tube-side outlet pipelines is connected to the tube-side inlet connection pipeline.

9. The high-pressure circulating gas cooling system according to claim 8, characterized in that, Each of the multiple high-pressure circulating gas coolers is provided with a refrigerant water inlet pipeline connected to the shell-side inlet, and the other end of each of the multiple refrigerant water inlet pipelines is connected to the shell-side inlet connecting pipeline; a shell-side three-way valve is provided at the connection position between the refrigerant water inlet pipeline and the shell-side inlet connecting pipeline; Each of the multiple high-pressure circulating gas coolers is provided with a refrigerant return water outlet pipeline connected to the shell-side outlet, and the other end of each of the multiple refrigerant return water outlet pipelines is connected to the shell-side inlet connection pipeline. Preferably, each of the multiple refrigerant return water outlet pipelines is equipped with a refrigerant return water outlet valve.

10. The high-pressure circulating gas cooling system according to claim 8, characterized in that, Each of the aforementioned high-pressure circulating gas coolers is equipped with a hot water inlet pipeline connected to the shell-side inlet, and the other end of each of the aforementioned hot water inlet pipelines is connected to the main hot water inlet pipeline. Each of the aforementioned high-pressure circulating gas coolers is provided with a hot water return outlet pipeline connected to the shell-side outlet, and the other end of each of the aforementioned hot water supply inlet pipelines is connected to the main hot water return outlet pipeline. Preferred, Each of the aforementioned hot water supply inlet pipelines is equipped with a hot water supply inlet valve; and / or Hot water return outlet valves are installed on all of the aforementioned hot water return outlet pipelines; More preferably, Each of the aforementioned high-pressure circulating gas coolers is equipped with a wax discharge pipeline, and the other end of each of the aforementioned wax discharge pipelines is connected to a main wax discharge pipeline; each of the aforementioned wax discharge pipelines is equipped with a wax discharge outlet valve.

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