Product gas dryer and method for replacing drying agent thereof

Abstract

The invention provides a product gas dryer and a method for replacing a drying agent through the product gas dryer. The product gas dryer comprises a drying cylinder, and the drying cylinder is of a split type in the axial direction and comprises a first drying sub-cylinder and a second drying sub-cylinder detachably arranged on the first drying sub-cylinder; the protection bed layer is arranged in the first drying sub-cylinder and comprises a protection bed porcelain ball module and a protection bed drying agent module which are sequentially arranged from bottom to top; the main bed layer is arranged in the first drying sub-cylinder, the main bed layer is arranged above the protection bed layer, and the main bed layer comprises a main bed drying agent module and a main bed porcelain ball module which are sequentially arranged from bottom to top; the protection bed ceramic ball module, the protection bed desiccant module, the main bed desiccant module and the main bed ceramic ball module are all of an integral structure, and the gas dryer can achieve quick desiccant replacement, does not lose materials and does not affect completion of annual production tasks.

Description

Technical Field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a product gas dryer and a method for replacing a desiccant therein. Background Art

[0002] The function of the product gas dryer is to dehydrate and dry the product gas entering the olefin separation process system. The product gas entering the olefin separation system contains a certain amount of water. If it is not removed, the water will freeze into ice during the low-temperature separation operation of the downstream distillation process system; under high pressure and low temperature conditions, water reacts with methane, ethane, propane, etc. to form hydrocarbon water compounds. Ice or hydrocarbon water compounds are easy to condense on the pipe wall, increase power consumption, and even block pipes and equipment, causing shutdown. In order to ensure the continuous and smooth operation of production, the product gas must be thoroughly dehydrated before entering the low-temperature separation system.

[0003] Product gas dehydration uses adsorption to remove moisture from product gas. The product gas dryer is filled with 3A molecular sieve (desiccant), which is a polar adsorbent. 3A molecular sieve has a large adsorption force on polar molecules and has a strong adsorption selectivity. Water is a strong polar molecule. When the mixed gas of product gas and water passes through the molecular sieve bed, water is adsorbed first. When most of the molecular sieve holes are filled with water molecules, its adsorption capacity will decrease, and the molecular sieve needs to be regenerated.

[0004] The product gas dryer regeneration uses dry nitrogen as the regeneration gas for the molecular sieve. The hot dry nitrogen passes through the molecular sieve bed containing water. Due to heating and purging, the water molecules adsorbed by the molecular sieve are desorbed from the pores of the molecular sieve and taken away by the nitrogen, which greatly reduces the water content of the molecular sieve and restores the original adsorption capacity.

[0005] The product gas dryer system consists of two dryers, one for normal operation and the other for regeneration or standby. The switching cycle of the product gas dryer is 48 hours. During operation, the product gas flows downward, and during regeneration, the regeneration gas flows upward. According to the actual operation, under high load conditions, if the operation time exceeds 48 hours, there is a risk of excessive moisture at the dryer outlet.

[0006] In the field of coal-to-olefins, in the pre-depropanization olefin separation technology, the product gas dryer is located after the water washing tower and alkali washing tower at the three-stage outlet of the product gas compressor. The feed temperature during operation is 13.7℃ and the pressure is 1.358MPaG; the bed temperature during regeneration is 200℃ and the pressure is 0.35MPaG; for the olefin separation process with only a gas phase dryer, the dryer switching frequency is high and cannot be reduced. Frequent switching and regeneration lead to pulverization of the 3A molecular sieve, increased pressure difference of the dryer, and decreased water absorption effect. When the outlet water content requirements cannot be met, the desiccant needs to be replaced. According to current operating practices, the desiccant needs to be replaced after the dryer has been in operation for 1 to 2 years. With the extension of the major overhaul cycle of the device, the desiccant replacement time is sometimes not in the major overhaul period of the device. Therefore, the device needs to be stopped for about 6 days to replace it, and two dryers (single bed diameter 3.1m, height 11.75m) are replaced with about 80 tons of filler. The olefin separation process belongs to the intermediate stage, and stopping to replace the desiccant requires the upstream and downstream devices to be stopped. Stopping the plant not only causes loss of materials, but also affects the completion of annual production targets.

[0007] At present, the whole process of desiccant unloading and loading is labor-intensive and time-consuming; the loading technology is high, for example, the 20-mesh screen has high requirements for the bonding technology with the container wall. If the bonding is not good, it is easy to cause the bottom of the porcelain ball to leak out. When unloading, the grid needs to be divided into small pieces and taken out. When loading, the small pieces are pressed against the grid and sent into the container, spliced ​​into a circle, and then fastened with bolts; the desiccant unloading and loading process is time-consuming. The desiccant cannot be replaced when the device is not stopped. If the dryer pressure difference is high during operation, the dryer agent is severely pulverized and cannot meet the dehydration requirements; or the desiccant powder causes blockage to the downstream system equipment, the device must be stopped to change the agent, and the shutdown will bring great economic losses to the factory.

[0008] Therefore, it is particularly important to design a product gas dryer that can achieve rapid replacement of desiccant and a method for replacing desiccant. Summary of the invention

[0009] In view of some or all of the above technical problems existing in the prior art, the present invention proposes a product gas dryer and a method for replacing desiccant therewith. The product gas dryer can realize rapid replacement of desiccant without material loss and without affecting the completion of annual production tasks.

[0010] According to one aspect of the present invention, there is provided a product gas dryer, comprising:

[0011] The drying cylinder is constructed as a split type in the axial direction and comprises a first drying sub-cylinder and a second drying sub-cylinder detachably arranged on the first drying sub-cylinder,

[0012] A guard bed layer is arranged in the first drying sub-drum, wherein the guard bed layer comprises a guard bed ceramic ball module and a guard bed desiccant module arranged in sequence from bottom to top,

[0013] A main bed layer is arranged in the first drying sub-drum, the main bed layer is arranged above the protective bed layer, and the main bed layer contains a main bed desiccant module and a main bed ceramic ball module arranged in sequence from bottom to top,

[0014] Wherein, the guard bed ceramic ball module, the guard bed desiccant module, the main bed desiccant module and the main bed ceramic ball module are all integral structures.

[0015] In one embodiment, the guard bed ceramic ball module comprises:

[0016] Cylindrical protective bed ceramic ball storage tube,

[0017] The protective bed ceramic ball grille is arranged at the bottom lower opening of the protective bed ceramic ball storage cylinder,

[0018] The protection bed ceramic balls are loaded into the inner cavity of the protection bed ceramic ball storage cylinder.

[0019] In one embodiment, the protection bed layer also includes a protection bed support grid, a protection bed 4-mesh stainless steel wire mesh, and a protection bed 20-mesh stainless steel wire mesh, which are arranged in the first drying sub-cylinder from bottom to top, and the protection bed ceramic ball module is arranged adjacent to the upper end of the protection bed 20-mesh stainless steel wire mesh.

[0020] In one embodiment, the guard bed desiccant module comprises:

[0021] Cylindrical protective bed desiccant storage cylinder,

[0022] A guard bed desiccant grid is provided at the bottom opening of the guard bed desiccant storage cylinder,

[0023] The guard bed desiccant is loaded in the inner cavity of the guard bed desiccant storage cylinder,

[0024] Wherein, a first step surface facing downward is arranged on the outer wall of the guard bed desiccant storage cylinder, and the lower end of the guard bed desiccant storage cylinder located on the first step surface is plugged into the guard bed ceramic ball storage cylinder.

[0025] In one embodiment, a first water content analysis table module is provided between the protection bed layer and the main bed layer, and the first water content analysis table module includes:

[0026] A first water content analysis meter cylinder, wherein a first online analysis meter pressure lead pipe hole is arranged on the outer wall of the first water content analysis meter cylinder,

[0027] a first water content analysis meter grid fixedly arranged at the bottom of the first water content analysis meter cylinder,

[0028] Wherein, the first online analyzer pressure-conducting pipe hole is connected to a first water content analyzer arranged on the outer wall of the drying cylinder through a first online analyzer pressure-conducting pipe.

[0029] In one embodiment, the main bed desiccant module comprises a plurality of sub-main bed desiccant modules arranged in sequence up and down, each of the sub-main bed desiccant modules comprising:

[0030] The cylindrical main bed desiccant storage cylinder,

[0031] The main bed desiccant grid is arranged in the inner cavity of the main bed desiccant storage cylinder,

[0032] The desiccant for the sub-bed is filled in the upper inner cavity of the desiccant storage cylinder for the sub-bed,

[0033] Wherein, the adjacent sub-main bed desiccant storage cylinders are plug-in connected.

[0034] In one embodiment, the main bed ceramic ball module comprises:

[0035] The main bed has a cylindrical ceramic ball storage tube.

[0036] The main bed ceramic ball grille is arranged at the bottom opening of the main bed ceramic ball storage cylinder.

[0037] The main bed ceramic balls are loaded in the inner cavity of the main bed ceramic ball storage cylinder,

[0038] A 20-mesh stainless steel wire mesh for the main bed is arranged in the inner cavity of the main bed ceramic ball storage cylinder and laid flat on the main bed ceramic balls.

[0039] The main bed 4-mesh stainless steel wire mesh is set in the inner cavity of the main bed porcelain ball storage cylinder and laid flat on the main bed 20-mesh stainless steel wire mesh,

[0040] A compression grid is arranged in the inner cavity of the ceramic ball storage cylinder of the main bed and laid flat on the 4-mesh stainless steel wire mesh of the main bed, and the compression grid is fixed to the ceramic ball storage cylinder of the main bed.

[0041] In one embodiment, a fixing plate extending radially is provided on the inner wall of the main bed ceramic ball storage cylinder, a notch is provided on the compression grid, and the fixing plate is snapped into the notch and fixed with the compression grid bolts.

[0042] In one embodiment, a master bed lifting lug is provided on the upper edge of the master bed ceramic ball storage tube.

[0043] According to another aspect of the present invention, there is provided a method for replacing a desiccant using the above-mentioned product gas dryer, comprising:

[0044] Step 1: Move the second drying sub-drum away from the first drying sub-drum to open the drying drum.

[0045] Step 2: Perform the agent unloading operation to take out the main bed ceramic ball module, the main bed desiccant module, the guard bed desiccant module and the guard bed ceramic ball module from the first drying sub-drum.

[0046] Step three, performing the loading operation, loading the new guard bed ceramic ball module, the guard bed desiccant module, the main bed desiccant module and the main bed ceramic ball module into the first drying sub-cylinder.

[0047] Step 4: Cover the second drying sub-drum onto the first drying sub-drum to close the drying drum.

[0048] Compared with the prior art, the advantages of the present invention are that the protection bed ceramic ball module, the protection bed desiccant module, the main bed desiccant module and the main bed ceramic ball module are all modularized, and the ceramic balls and desiccant of the protection bed layer and the main bed layer are integrated, so that before replacing the agent, the filling work of these desiccant modules and ceramic ball modules is completed outside the drying cylinder; and after the drying cylinder is opened, the modular desiccant module and ceramic ball module are hoisted out, and the newly loaded modules outside are reinstalled. It can be seen that through modularization, the longest time-consuming loading work is completed in advance outside the drying cylinder, so as to achieve the purpose of quickly replacing the desiccant and solve the problem that the product gas dryer cannot replace the desiccant when the device is running. The split structure of the drying cylinder can support the unloading and loading of each module. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0050] Figure 1 shows a structural diagram of a product gas dryer according to one embodiment of the present invention;

[0051] Figure 2a A stereoscopic view showing a protection bed ceramic ball storage cylinder and a protection bed ceramic ball grid of a protection bed ceramic ball module according to an embodiment of the present invention;

[0052] Figure 2b A top view of a protection bed ceramic ball storage cylinder and a protection bed ceramic ball grid of a protection bed ceramic ball module according to an embodiment of the present invention is shown;

[0053] Figure 2c An axial cross-sectional view of a protection bed ceramic ball storage cylinder and a protection bed ceramic ball grid of a protection bed ceramic ball module according to an embodiment of the present invention is shown;

[0054] Figure 3a A perspective view showing a guard bed desiccant storage cylinder and a guard bed desiccant grid of a guard bed desiccant module according to one embodiment of the present invention;

[0055] Figure 3b A top view of a guard bed desiccant storage cylinder and a guard bed desiccant grid of a guard bed desiccant module according to one embodiment of the present invention is shown;

[0056] Figure 3c An axial cross-sectional view of a guard bed desiccant storage cylinder and a guard bed desiccant grid of a guard bed desiccant module according to one embodiment of the present invention is shown;

[0057] Figure 4a A perspective view showing a first water content analysis meter barrel and a first water content analysis meter grid of a first water content analysis meter module according to one embodiment of the present invention;

[0058] Figure 4b A top view of a first water content analysis meter barrel and a first water content analysis meter grid of a first water content analysis meter module according to one embodiment of the present invention is shown;

[0059] Figure 4c An axial cross-sectional view showing a first water content analysis meter barrel and a first water content analysis meter grid of a first water content analysis meter module according to one embodiment of the present invention;

[0060] Figure 5a A stereoscopic view showing a lower sub-main-bed desiccant storage cylinder and a lower sub-main-bed desiccant grid of a lower sub-main-bed desiccant module according to an embodiment of the present invention;

[0061] Figure 5b A top view of a lower sub-main-bed desiccant storage cylinder and a lower sub-main-bed desiccant grid of a lower sub-main-bed desiccant module according to an embodiment of the present invention is shown;

[0062] Figure 5c An axial cross-sectional view of a lower main bed desiccant storage cylinder and a lower main bed desiccant grid of a lower main bed desiccant module according to an embodiment of the present invention is shown;

[0063] Figure 6a A three-dimensional view showing an upper main bed desiccant storage cylinder and an upper main bed desiccant grid of an upper main bed desiccant module according to an embodiment of the present invention;

[0064] Figure 6b A top view of an upper main bed desiccant storage cylinder and an upper main bed desiccant grid of an upper main bed desiccant module according to an embodiment of the present invention is shown;

[0065] Figure 6c An axial cross-sectional view of an upper main bed desiccant storage cylinder and an upper main bed desiccant grid of an upper main bed desiccant module according to an embodiment of the present invention is shown;

[0066] Figure 7a A three-dimensional view showing a main bed ceramic ball storage cylinder and a main bed ceramic ball grid of a main bed ceramic ball module according to an embodiment of the present invention;

[0067] Figure 7b A top view of a main bed ceramic ball storage cylinder and a main bed ceramic ball grid of a main bed ceramic ball module according to an embodiment of the present invention is shown;

[0068] Figure 7c An axial cross-sectional view of a main bed ceramic ball storage cylinder and a main bed ceramic ball grid of a main bed ceramic ball module according to an embodiment of the present invention is shown;

[0069] Figure 7d A compression grid of a main bed ceramic ball module according to one embodiment of the present invention is shown.

[0070] In the drawings, the same reference numerals are used for the same components, but the drawings are not drawn to scale. DETAILED DESCRIPTION

[0071] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0072] The embodiment of the present invention provides a product gas dryer. Figure 1As shown, the product gas dryer includes a drying cylinder 20, a protective bed layer and a main bed layer. Among them, the drying cylinder 20 is a container-like structure, which serves as a container body for receiving and outputting product gas. According to the present application, the dryer 20 is constructed as an axial split structure, and contains a first drying sub-cylinder 22 and a second drying sub-cylinder 21, and the second drying sub-cylinder 21 is detachably arranged at the upper end of the first drying sub-cylinder 22. The second drying sub-cylinder 21 is used to form the drying cylinder 20 with the first drying sub-cylinder 22, and the second drying sub-cylinder 21 plays the role of covering the upper end opening of the first drying sub-cylinder 22. The protective bed layer is arranged in the first drying sub-cylinder 22. The protective bed layer includes a protective bed ceramic ball module 5 and a protective bed desiccant module 6 arranged sequentially from bottom to top. The main bed layer is arranged in the first drying sub-cylinder 22. At the same time, the main bed layer is arranged at the upper end of the protective bed layer. The main bed layer contains a main bed desiccant module 23 and a main bed ceramic ball module 19 arranged sequentially from bottom to top. According to the present application, the protection bed ceramic ball module 5, the protection bed desiccant module 6, the main bed desiccant module 23 and the main bed ceramic ball module 19 are all integral structures.

[0073] Also, see Figure 1 , a first manhole 1 is provided on the outer wall of the drying cylinder 20. A second manhole 16 is provided on the top wall of the drying cylinder 20, and specifically, the second manhole 16 is provided on the second drying sub-cylinder 21. The protective bed layer also includes a protective bed support grid 2, a protective bed 4-mesh stainless steel wire mesh 3, and a protective bed 20-mesh stainless steel wire mesh 4. Specifically, the protective bed layer support grid 2 is laid in the first drying sub-cylinder 22, which mainly plays a supporting role at the bottom. The protective bed 4-mesh stainless steel wire mesh 3 and the protective bed 20-mesh stainless steel wire mesh 4 are laid in sequence above the protective bed layer support grid 2. The protective bed ceramic ball module 5 is located above the protective bed 20-mesh stainless steel wire mesh 4, and the protective bed desiccant module 6 is located above the protective bed ceramic ball module 5. In the main bed layer, the main bed ceramic ball module 19 is located above the main bed desiccant module 23. The first water content analysis table module 7 is located between the protective bed layer and the main bed layer in the axial direction of the drying cylinder 20. The first drying sub-cylinder 22 is connected to the second drying sub-cylinder 21 by a flange 14. The product gas feed pipeline is connected to the second manhole 16 by a short circuit 15. h is the filling height of the protective bed desiccant, H is the filling height of the main bed desiccant, and R1 is the radius of the dryer 20.

[0074] In the present application, the drying cylinder 20 is split, and the first drying sub-cylinder 22 is connected to the second drying sub-cylinder 21 by a flange 14, so that the drying cylinder 20 can be opened quickly to ensure the smooth installation and removal of each desiccant module and ceramic ball module. The protective bed ceramic ball module 5, the protective bed desiccant module 6, the main bed desiccant module 23 and the main bed ceramic ball module 19 are all modularized. Before changing the desiccant, the filling work of these desiccant modules and ceramic ball modules is completed outside the drying cylinder 20; after the drying cylinder 20 is opened, the modularized desiccant modules and ceramic ball modules are hoisted out, and the newly loaded modules outside are reinstalled. Through the modularization of the desiccant and ceramic ball inside the drying cylinder 20, the longest time-consuming loading work is completed in advance outside the drying cylinder 20, so as to achieve the purpose of quickly replacing the desiccant and solve the problem that the product gas dryer cannot replace the desiccant when the device is running.

[0075] Look again Figure 2a , 2b 2c, the protection bed ceramic ball module 5 includes a protection bed ceramic ball storage cylinder 51, a protection bed ceramic ball grid 52 and a protection bed ceramic ball 53. Among them, the protection bed ceramic ball storage cylinder 51 is constructed to match the cross-sectional shape of the first drying cylinder 21, so as to serve as a container for storage. In the present application, if the cross-section of the drying cylinder 20 is circular, then the cross-section of each module is also circular. For example, the cross-section of the protection bed ceramic ball storage cylinder 51 is circular. The protection bed ceramic ball storage cylinder 51 can be made of metal such as stainless steel. The protection bed ceramic ball grid 52 is a metal grid such as stainless steel arranged at the bottom of the protection bed ceramic ball storage cylinder 51. For example, the protection bed ceramic ball grid 52 can be fixed to the inner wall of the protection bed ceramic ball storage cylinder 51 by welding.

[0076] In a specific example, h1=200mm. The radius of the dryer 20 is R1, and the radius of the protective bed ceramic ball storage cylinder 51 is R2, then R1-R2=5mm. That is to say, after the protective bed ceramic ball module 5 is installed in the drying cylinder 20, it is spaced from the wall of the drying cylinder 20, and this space helps to seal; at the same time, this space also takes into account the thermal expansion and contraction of the metal, and prevents the protective bed ceramic ball storage cylinder 51 from expanding and exerting force on the drying cylinder 20.

[0077] The wall of the protective bed ceramic ball storage cylinder 51 is evenly opened with 4 protective bed ceramic ball hoisting holes 54 of equal height along the circumference, which is convenient for hoisting operation. The protective bed ceramic ball hoisting holes 54 are 20mm away from the upper edge of the protective bed ceramic ball storage cylinder 51. This height is convenient for operation and is also conducive to the sealing between the socket modules.

[0078] When filling the protection bed ceramic ball module 5, a 20-mesh stainless steel wire mesh is laid on the protection bed ceramic ball grid 52 in the protection bed ceramic ball storage tube 51. The diameter of the 20-mesh stainless steel wire mesh is 100 mm larger than the diameter of the protection bed ceramic ball storage tube 51 to prevent the protection bed ceramic balls 53 from leaking out. Then, the protection bed ceramic balls 53 of corresponding specifications are filled. The filling height of the protection bed ceramic balls 53 is 150 mm, and the protection bed ceramic ball module 5 is filled. The unfilled part is reserved for the installation amount of plug-in.

[0079] Look again Figure 3a , 3b 3c, the guard bed desiccant module 6 includes a guard bed desiccant storage cylinder 61, a guard bed desiccant grid 62 and a guard bed desiccant. The guard bed desiccant storage cylinder 61 is cylindrical and mainly serves as a storage container. The guard bed desiccant storage cylinder 61 can be made of metal. The guard bed desiccant grid 62 is welded to the bottom of the guard bed desiccant storage cylinder 61. A first step surface 65 facing downward is provided on the outer wall of the guard bed desiccant storage cylinder 61. The first step surface 65 makes the radius dimension of the upper end of the guard bed desiccant storage cylinder 61 larger than the radius dimension of the lower end, which is recorded as R2 and R3. This setting allows the lower end of the guard bed desiccant storage cylinder 61 located on the first step surface 65 to be plugged into the guard bed ceramic ball storage cylinder 51. That is, the lower end of the guard bed desiccant storage cylinder 61 is inserted into the inner cavity of the guard bed ceramic ball storage cylinder 51.

[0080] Specifically, the height of the guard bed desiccant storage cylinder 61 below the first step surface 65 is h3=50mm; the height of the guard bed desiccant storage cylinder 61 above the first step surface 65 is h2. The radius of the dryer 20 is R1, then R1-R2=5mm, R2-R3=5mm, this setting can ensure that there are gaps between different components. Specifically, this setting allows a gap between the lower end of the guard bed desiccant storage cylinder 61 and the guard bed ceramic ball storage cylinder 51 after plugging, and also allows a gap between the upper end of the guard bed desiccant storage cylinder 61 and the drying cylinder 20. This setting is conducive to sealing, while taking into account the thermal expansion and contraction of metal.

[0081] The peripheral wall of the guard bed desiccant storage cylinder 61 is evenly opened with four guard bed desiccant hoisting holes 64 of equal height along the circumference to facilitate the hoisting operation. The guard bed desiccant hoisting holes 64 are 20 mm away from the upper edge of the guard bed desiccant storage cylinder 61.

[0082] When loading the desiccant, a 20-mesh stainless steel wire mesh is laid at the bottom of the guard bed desiccant storage cylinder 61. The diameter of the 20-mesh stainless steel wire mesh is 100 mm larger than the diameter of the module h3 section to prevent the desiccant from leaking out. It is easy to understand that the 20-mesh stainless steel wire mesh is located above the guard bed desiccant grid 62. Then load the desiccant of the corresponding specification. The desiccant loading height is 50 mm lower than the upper edge of the guard bed desiccant storage cylinder 61. A 20-mesh stainless steel wire mesh is laid on the top of the desiccant. The diameter of the 20-mesh stainless steel wire mesh is 100 mm larger than the diameter of the module h2 section. The guard bed desiccant loading height is h, then h2+h3-h=50 mm, and the guard bed desiccant module 6 is loaded.

[0083] A first water content analysis table module 7 is provided between the protective bed layer and the main bed layer. Figure 4a , 4b As shown in 4c, the first water content analysis meter module 7 includes a first water content analysis meter cylinder 71 and a first water content analysis meter grid 72. Among them, the first water content analysis meter cylinder 71 is cylindrical. For example, the first water content analysis meter cylinder 71 is made of high-strength metal such as stainless steel. The first water content analysis meter grid 72 is welded to the bottom of the first water content analysis meter cylinder 71. In the axial direction of the first water content analysis meter cylinder 71, the radius size of the middle section is greater than the radius size of the two end sections. Specifically, h4=h5=h6=50mm; the radius of the dryer 20 is R1, the radius size of the axial middle section of the first water content analysis meter cylinder 71 is R2, and the radius size of the two end sections is R3, then R1-R2=5mm, R2-R3=5mm. After connection, the lower end section of the first water content analysis meter cylinder 71, that is, the h6 section, is inserted into the inner cavity of the protective bed desiccant storage cylinder 61. The upper end section of the first water content analysis meter cylinder 71, i.e., section h4, is inserted into the sub-main bed desiccant storage cylinder 81. It can be seen that in the axial direction, the first water content analysis meter cylinder 71 is plugged with the adjacent guard bed desiccant storage cylinder 61 and the sub-main bed desiccant storage cylinder 81, and in the radial direction, there is a gap between the first water content analysis meter cylinder 71 and the adjacent guard bed desiccant storage cylinder 61 and the sub-main bed desiccant storage cylinder 81, which is used to leave a change margin due to thermal shrinkage and is helpful for setting the seal.

[0084] Four equal-height first water content analyzer hoisting holes 73 are arranged on the outer wall of the first water content analyzer tube 71 to facilitate hoisting operations. The first water content analyzer hoisting hole 73 is 20 mm away from the upper edge of the first water content analyzer module 7. To install the first online analyzer pressure pipe 74. A first online analyzer pressure pipe hole 75 is opened in the axial middle section of the first water content analyzer tube 71, i.e., the high h5 section. The opening size of the first online analyzer pressure pipe hole 75 is slightly larger than the outer diameter of the first online analyzer pressure pipe 74. The first water content analyzer 17 is connected to the first online analyzer pressure pipe hole 75 through the first online analyzer pressure pipe 74. The first water content analyzer 17 is mainly used to monitor the water content in the drying tube 20 between the protective bed layer and the main bed layer.

[0085] The main bed desiccant module 23 includes a plurality of sub-main bed desiccant modules arranged in sequence up and down. Each sub-main bed desiccant module includes a cylindrical sub-main bed desiccant storage cylinder, a sub-main bed desiccant grid arranged in the inner cavity of the sub-main bed desiccant storage cylinder, and a sub-main bed desiccant filled in the upper inner cavity of the sub-main bed desiccant storage cylinder. Adjacent sub-main bed desiccant storage cylinders are plug-in connected.

[0086] For the sake of clarity, the sub-main bed desiccant module located at the bottom is referred to as the lower sub-main bed desiccant module 8. Figure 5a , 5b As shown in 5c, the lower main bed desiccant storage cylinder 81 is cylindrical. In the axial direction, the lower main bed desiccant grid 82 is set at a distance H3 from the lower edge. The lower main bed desiccant is filled in the inner cavity of the lower main bed desiccant storage cylinder 81 above the lower main bed desiccant grid 82, and the lower end inner cavity of the lower main bed desiccant storage cylinder 81 is used for the upper end of the first water content analysis meter cylinder 71 to be inserted.

[0087] The lower main bed desiccant storage cylinder 81 is made of metal such as stainless steel. The lower main bed desiccant grid 82 is welded at a height of H3 = 50mm. The radius of the lower main bed desiccant storage cylinder 81 is R2, and the radius of the drying cylinder 20 is R1, then R1-R2 = 5mm, this width is conducive to the sealing between the lower main bed desiccant storage cylinder 81 and the drying cylinder 20, while taking into account the thermal expansion and contraction of the metal. Four lower main bed desiccant hanging holes 83 are evenly arranged on the outer wall of the lower main bed desiccant storage cylinder 81 in the circumferential direction. The lower main bed desiccant hanging holes 83 are 20mm away from the upper edge.

[0088] When loading desiccant, a 20-mesh stainless steel wire mesh is laid on the lower main bed desiccant grid 82 of the lower main bed desiccant storage tube 81. The diameter of the 20-mesh stainless steel wire mesh is 100mm larger than the diameter of the lower main bed desiccant storage tube 81 to prevent desiccant leakage. Then load desiccant of corresponding specifications. The total height of the main bed desiccant filling is H, then for example, H2=H / 5; the desiccant filling height in the lower main bed desiccant storage tube 81 is H2-H3-100mm, that is, to ensure that the desiccant filling height of the lower main bed desiccant module 8 is 100mm away from the upper edge.

[0089] For the sake of clarity, the upper sub-bed desiccant module is referred to as the upper sub-bed desiccant module 9. Figure 6a , 6b As shown in 6c, the upper main bed desiccant storage cylinder 91 is cylindrical. It is easy to understand that each upper main bed desiccant storage cylinder 91 needs to be inserted into the lower main bed desiccant storage cylinder. Then the upper main bed desiccant storage cylinder 91 is constructed as a cylinder with a small diameter at the lower end and a large diameter at the upper end. The upper section radius of the upper main bed desiccant storage cylinder 91 is R2, the lower section radius is R3, and the radius of the drying cylinder 20 is R1, then R1-R2=5mm, R2-R3=5mm, this setting is conducive to the sealing between adjacent upper main bed desiccant storage cylinders 91, between the upper main bed desiccant storage cylinder 91 and the lower main bed desiccant storage cylinder 81, and between the upper main bed desiccant storage cylinder 91 and the drying cylinder 20, while taking into account the thermal expansion and contraction of the metal. The upper main bed desiccant storage cylinder 91 is made of metal such as stainless steel. The bottom of the upper main bed desiccant storage cylinder 91 is welded with an upper main bed desiccant grid 92. The upper main bed desiccant grid 92 can be made of, for example, stainless steel. Four upper main bed desiccant hanging holes 93 are evenly formed on the outer wall of the upper main bed desiccant storage cylinder 91 in the circumferential direction. The upper main bed desiccant hanging holes 93 are 20 mm away from the upper edge.

[0090] When loading desiccant, a 20-mesh stainless steel wire mesh is laid at the bottom of the upper main bed desiccant storage cylinder 91. The diameter of the 20-mesh stainless steel wire mesh is 100mm larger than the diameter of the H4 section to prevent desiccant from leaking out. Then load desiccant of corresponding specifications. The total height of the main bed desiccant loading is H, then H2 = H / 5; the desiccant loading height in the upper main bed desiccant storage cylinder 91 is 100mm lower than the upper edge, and the desiccant loading of the lower main bed desiccant module 8 is completed.

[0091] In the present application, a plurality of, for example, four, upper main bed desiccant modules 9 may be arranged in sequence in the drying cylinder 20. Figure 7a , 7bAs shown in Figures 7c and 7d, the main bed ceramic ball module 19 includes a cylindrical main bed ceramic ball storage cylinder 191. The main bed ceramic ball storage cylinder 191 is constructed so that the diameter of the lower end is smaller than that of the upper end, and is used to be plugged into the inner cavity of the upper main bed desiccant storage cylinder 91 adjacent thereto. Specifically, the height of the lower section H4 is 100mm. The height of the upper section H1 is also 100mm. The radius of the upper section is R2, while the radius of the lower section is R3, and the radius of the drying cylinder 20 is R1, then R1-R2=5mm, R2-R3=5mm. This setting helps to ensure the gap between the main bed ceramic ball storage cylinder 191 and the drying cylinder 20, thereby facilitating the setting of the seal, and also helps to ensure the gap between the main bed ceramic ball storage cylinder 191 and the upper main bed desiccant storage cylinder 91, thereby facilitating the setting of the seal.

[0092] A main bed porcelain ball grid 192 is arranged at the bottom lower opening of the main bed porcelain ball storage cylinder 191. The main bed porcelain balls 10 are filled in the inner cavity of the main bed porcelain ball storage cylinder 191.

[0093] A main bed lifting lug 193 is provided on the upper edge of the main bed porcelain ball storage cylinder 191. The main bed lifting lug 193 can be four evenly distributed in the circumferential direction for convenient lifting.

[0094] When loading the main bed layer ceramic balls 10, a 20-mesh stainless steel wire mesh is laid on the main bed ceramic ball grid 192 of the main bed ceramic ball storage tube 191. The diameter of the 20-mesh stainless steel wire mesh is larger than the diameter of the H4 section of the main bed ceramic ball storage tube 191 by 100mm to prevent the ceramic balls from leaking out. Then load the main bed layer ceramic balls 10 of corresponding specifications. The loading height of the main bed layer ceramic balls 10 is 150mm. After loading the main bed layer ceramic balls 10, the plane of the main bed layer ceramic balls 10 is 50mm away from the upper edge of the main bed ceramic ball storage tube 191. In the inner cavity of the main bed ceramic ball storage tube 191, a 20-mesh stainless steel wire mesh 11 is laid flat on the main bed ceramic balls 10. The diameter of the 20-mesh stainless steel wire mesh 11 is larger than the diameter of the H1 section of the main bed ceramic ball storage tube 191 by 100mm. The main bed 4-mesh stainless steel wire mesh 12 is laid flat on the main bed 20-mesh stainless steel wire mesh 11, and the diameter of the main bed 4-mesh stainless steel wire mesh 12 is the same as the diameter of the H1 section. A compression grid 13 is set on the main bed 4-mesh stainless steel wire mesh 12. The compression grid 13 is fixed to the main bed ceramic ball storage tube 191. Specifically, a fixing plate 194 extending radially is provided on the inner wall of the main bed ceramic ball storage tube 191. At the same time, a notch 195 is provided on the compression grid 13. The fixing plate 194 is snapped into the notch 195 and fixed with the compression grid 13 bolts. The main bed layer ceramic balls 10 are loaded.

[0095] A second water content analysis meter is provided on the product gas pipeline downstream of the drying cylinder 20 to detect the water content of the dried product gas.

[0096] According to the following Figures 1 to 7d Describe in detail how to replace the desiccant.

[0097] First, remove the short circuit 15 connecting the product gas feed pipeline and the second manhole 16, and open the first manhole 1. Open the flange 14, so that the second drying sub-drum 21 is suspended from the first drying sub-drum 22, and ensure that the drying drum 20 is open.

[0098] Then, the agent unloading operation is performed. Specifically, the main bed ceramic ball module 19 is hoisted out. Then, multiple upper main bed desiccant modules 9 are hoisted out in sequence. Then, the lower main bed desiccant module 8 is hoisted out. The first online analyzer pressure-inducting pipe 74 inside the first water content analyzer module 7 is removed, and the first water content analyzer module 7 is hoisted out. The guard bed desiccant module 6 and the guard bed ceramic ball module 5 are hoisted out. Take out the guard bed 20 mesh stainless steel wire mesh 4, and the guard bed 4 mesh stainless steel wire mesh 3. Clean the waste agent on the bottom guard bed support grid 2. Then clean the waste agent on the support ring for supporting the guard bed support grid 2 in the drying cylinder 20. Check the structures such as bolts used to fix the guard bed support grid 2, tighten any loose bolts, and check the bottom support. The agent unloading operation is completed.

[0099] Finally, the filling operation is carried out.

[0100] First, prepare. Specifically, first load the protective bed ceramic ball module 5. Lay a 20-mesh stainless steel wire mesh at the bottom of the protective bed ceramic ball storage tube 51. Load ceramic balls of corresponding specifications, with the ceramic balls loaded at 150mm. Ceramic fiber strips are wrapped around the upper and lower ends of the outer wall of the protective bed ceramic ball storage tube 51 to seal the 5mm gap between the outer wall of the protective bed ceramic ball module 5 and the wall of the drying tube 20 to prevent air leakage at this location, which may cause part of the gas to not pass through the desiccant.

[0101] The guard bed desiccant module 6 is loaded. A 20-mesh stainless steel wire mesh is laid at the bottom of the guard bed desiccant storage cylinder 61, and desiccant of corresponding specifications is loaded. The desiccant loading height is 50 mm lower than the upper edge of the guard bed desiccant storage cylinder 61. A 20-mesh stainless steel wire mesh is laid on the top of the desiccant. High-temperature resistant ceramic fiber strips are wrapped around the upper and lower ends of the outer wall of the guard bed desiccant module 6, which are respectively used to seal the 5 mm gap between the outer wall of the guard bed desiccant module 6 and the wall of the drying cylinder 20, and the 5 mm gap between the guard bed desiccant module 6 and the guard bed ceramic ball storage cylinder 51, to prevent air leakage at this position and cause part of the gas to not pass through the desiccant.

[0102] The lower main bed desiccant module 8 is loaded. A 20-mesh stainless steel wire mesh is laid at the bottom of the lower main bed desiccant storage cylinder 81, and desiccant of corresponding specifications is loaded. The desiccant loading height in the lower main bed desiccant storage cylinder 81 is 100mm lower than the upper edge. The upper and lower ends of the outer wall of the lower main bed desiccant storage cylinder 81 are wrapped with high-temperature resistant ceramic fiber strips to seal the 5mm gap between the lower main bed desiccant storage cylinder 81 and the wall of the drying cylinder 20 to prevent air leakage at this position, which may cause some gas not to pass through the desiccant.

[0103] Multiple upper main bed desiccant modules 9 are loaded. A 20-mesh stainless steel wire mesh is laid at the bottom of the upper main bed desiccant storage cylinder 91, and desiccant of corresponding specifications is loaded. The desiccant loading height is 100mm lower than the upper edge of the upper main bed desiccant storage cylinder 91. High-temperature resistant ceramic fiber strips are wrapped around the upper and lower ends of the outer wall of the upper main bed desiccant storage cylinder 91 to seal the 5mm gap between the outer wall of the upper main bed desiccant storage cylinder 91 and the wall of the drying cylinder 20, as well as the 5mm gap between the upper main bed desiccant storage cylinder 91 and the adjacent storage cylinders, to prevent air leakage at this position and cause part of the gas to not pass through the desiccant.

[0104] The main bed ceramic ball module 19 is loaded. A 20-mesh stainless steel wire mesh is laid at the bottom of the main bed ceramic ball storage tube 191, and ceramic balls of corresponding specifications are loaded. The ceramic ball loading height is 150mm. After loading, the height of the ceramic balls is 50mm lower than the upper edge of the main bed ceramic ball storage tube 191. The main bed 20-mesh stainless steel wire mesh 11 is laid on the upper part of the ceramic balls. The main bed 4-mesh stainless steel wire mesh 12 is laid on the main bed 20-mesh stainless steel wire mesh 11. The main bed 4-mesh stainless steel wire mesh 12 is installed with a clamping grid 13. The clamping grid 13 is fixed to the fixing plate 194 by bolts, and the main bed ceramic ball module 19 is loaded. High-temperature resistant ceramic fiber strips are wrapped around the upper and lower ends of the outer wall of the main bed ceramic ball storage cylinder 191 to seal the 5mm gap between the outer wall of the main bed ceramic ball storage cylinder 191 and the wall of the drying cylinder 20, as well as to seal the 5mm gap between the main bed ceramic ball storage cylinder 191 and the uppermost upper main bed desiccant storage cylinder 91 to prevent air leakage at this position.

[0105] The upper, middle and lower ends of the outer wall of the first water content analysis meter module 7 are wound with high-temperature resistant ceramic fiber strips to seal the 5mm gap between the first water content analysis meter cylinder 71 and the wall of the drying cylinder 20, the 5mm gap between the first water content analysis meter cylinder 71 and the protective bed desiccant storage cylinder 61, and the 5mm gap between the first water content analysis meter cylinder 71 and the lower main bed desiccant storage cylinder 81 to prevent air leakage at the corresponding positions.

[0106] The above preparation steps are completed in advance on the outside of the drying cylinder 20. Check the protective bed support grid 2 and the corresponding accessories again, and the screws used for fixing are tightened. Lay the protective bed 4-mesh stainless steel wire mesh 3 on the protective bed support grid 2 (the diameter of the protective bed 4-mesh stainless steel wire mesh 3 is the same as the diameter of the drying cylinder 20), and then lay the protective bed 20-mesh stainless steel wire mesh 4 (the diameter of the protective bed 20-mesh stainless steel wire mesh 4 is greater than the diameter of the drying cylinder 20 by 100mm). Hoist the externally loaded protective bed ceramic ball module 5. Hoist the externally loaded protective bed desiccant module 6. Hoist the first water content analysis table module 7, and connect the first water content analysis table 17 with the first online analysis table pressure pipe 74. Hoist the externally loaded lower main bed desiccant module 8. Hoist multiple upper main bed desiccant modules 9. Hoist the externally loaded main bed ceramic ball module 19. Hoist the second drying sub-cylinder 21 and connect it to the first drying sub-cylinder 22 through the flange 14. Reinstall the short circuit 15 connecting the product gas feed pipeline and the second manhole 16, and close the first manhole 1. The filling operation is completed.

[0107] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A product gas dryer, characterized in that: include: The drying cylinder is constructed as a split type in the axial direction and comprises a first drying sub-cylinder and a second drying sub-cylinder detachably arranged on the first drying sub-cylinder, A guard bed layer is arranged in the first drying sub-drum, wherein the guard bed layer comprises a guard bed ceramic ball module and a guard bed desiccant module arranged in sequence from bottom to top, A main bed layer is arranged in the first drying sub-drum, the main bed layer is arranged above the protective bed layer, and the main bed layer contains a main bed desiccant module and a main bed ceramic ball module arranged in sequence from bottom to top, Wherein, the guard bed ceramic ball module, the guard bed desiccant module, the main bed desiccant module and the main bed ceramic ball module are all integral structures.

2. The product gas dryer according to claim 1, characterized in that: The protection bed ceramic ball module comprises: Cylindrical protective bed ceramic ball storage tube, The protective bed ceramic ball grille is arranged at the bottom lower opening of the protective bed ceramic ball storage cylinder, The protection bed ceramic balls are loaded into the inner cavity of the protection bed ceramic ball storage cylinder.

3. The product gas dryer according to claim 2, characterized in that: The protection bed layer also includes a protection bed support grid, a protection bed 4-mesh stainless steel wire mesh, and a protection bed 20-mesh stainless steel wire mesh, which are arranged in the first drying sub-cylinder from bottom to top, and the protection bed ceramic ball module is arranged adjacent to the upper end of the protection bed 20-mesh stainless steel wire mesh.

4. The product gas dryer according to claim 2 or 3, characterized in that: The guard bed desiccant module comprises: Cylindrical protective bed desiccant storage cylinder, A guard bed desiccant grid is provided at the bottom opening of the guard bed desiccant storage cylinder, The guard bed desiccant is loaded in the inner cavity of the guard bed desiccant storage cylinder, Wherein, a first step surface facing downward is arranged on the outer wall of the guard bed desiccant storage cylinder, and the lower end of the guard bed desiccant storage cylinder located on the first step surface is plugged into the guard bed ceramic ball storage cylinder.

5. The product gas dryer according to any one of claims 1 to 4, characterized in that: A first water content analysis table module is provided between the protection bed layer and the main bed layer, and the first water content analysis table module includes: A first water content analysis meter cylinder, wherein a first online analysis meter pressure lead pipe hole is arranged on the outer wall of the first water content analysis meter cylinder, a first water content analysis meter grid fixedly arranged at the bottom of the first water content analysis meter cylinder, Wherein, the first online analyzer pressure-conducting pipe hole is connected to a first water content analyzer arranged on the outer wall of the drying cylinder through a first online analyzer pressure-conducting pipe.

6. The product gas dryer according to any one of claims 1 to 5, characterized in that: The main bed desiccant module comprises a plurality of sub-main bed desiccant modules arranged in sequence up and down, each of the sub-main bed desiccant modules comprising: The cylindrical main bed desiccant storage cylinder, The main bed desiccant grid is arranged in the inner cavity of the main bed desiccant storage cylinder, The desiccant for the sub-bed is filled in the upper inner cavity of the desiccant storage cylinder for the sub-bed, Wherein, the adjacent sub-main bed desiccant storage cylinders are plug-in connected.

7. The product gas dryer according to claim 6, characterized in that: The main bed ceramic ball module comprises: The main bed has a cylindrical ceramic ball storage tube. The main bed ceramic ball grille is arranged at the bottom opening of the main bed ceramic ball storage cylinder. The main bed ceramic balls are loaded in the inner cavity of the main bed ceramic ball storage cylinder, A 20-mesh stainless steel wire mesh for the main bed is arranged in the inner cavity of the main bed ceramic ball storage cylinder and laid flat on the main bed ceramic balls. The main bed 4-mesh stainless steel wire mesh is set in the inner cavity of the main bed porcelain ball storage cylinder and laid flat on the main bed 20-mesh stainless steel wire mesh, A compression grid is arranged in the inner cavity of the ceramic ball storage cylinder of the main bed and laid flat on the 4-mesh stainless steel wire mesh of the main bed, and the compression grid is fixed to the ceramic ball storage cylinder of the main bed.

8. The product gas dryer according to claim 7, characterized in that: A fixing plate extending in the radial direction is arranged on the inner wall of the ceramic ball storage cylinder of the main bed, a notch is arranged on the clamping grid, and the fixing plate is snapped into the notch and fixed with the clamping grid bolts.

9. The product gas dryer according to claim 7 or 8, characterized in that: A main bed hanging lug is arranged on the upper edge of the main bed ceramic ball storage tube.

10. A method for replacing desiccant using the product gas dryer according to any one of claims 1 to 9, characterized in that: include: Step 1: Move the second drying sub-drum away from the first drying sub-drum to open the drying drum. Step 2: Perform the agent unloading operation to take out the main bed ceramic ball module, the main bed desiccant module, the guard bed desiccant module and the guard bed ceramic ball module from the first drying sub-drum. Step three, performing the loading operation, loading the new guard bed ceramic ball module, the guard bed desiccant module, the main bed desiccant module and the main bed ceramic ball module into the first drying sub-cylinder. Step 4: Cover the second drying sub-drum onto the first drying sub-drum to close the drying drum.

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