Air cooler for propane dehydrogenation propylene preparation process

Abstract

The invention provides an air cooler for a process for preparing propylene through propane dehydrogenation, and aims to solve the technical problems that an air cooler in the prior art is lack of a water recovery mechanism, and water resources are wasted. The air cooler comprises a water recycling mechanism and an air cooler shell, the water recycling mechanism comprises a water recycling frame, a water recycling assembly and a water storage assembly, and the air cooler shell is covered with the water recycling frame; the water recovery assemblies are arranged on the water recovery frame in a matrix mode and located on an air outlet path of the air cooler shell. A water collecting tank is arranged below the water recycling assembly and connected with the water storage assembly through a pipeline. When air flow discharged by the air cooler shell penetrates through the water recovery assembly, liquid water in the air flow can be effectively captured and recovered, then the liquid water drips into the water collection tank from the water recovery assembly and is conveyed to the water storage assembly through a pipeline to be stored for subsequent utilization, and therefore effective recovery and utilization of the liquid water released by the spraying assembly are achieved. And waste of water resources is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of propylene production, in particular to an air cooler used in a process of producing propylene by dehydrogenating propane. Background Art

[0002] An air cooler is a heat exchange device that uses ambient air as a cooling medium. Its working principle is to exchange heat between a large amount of inhaled ambient air and the high-temperature process fluid in the tube bundle, thereby effectively reducing the temperature of the fluid and achieving its cooling or condensation.

[0003] In the process of producing propylene by dehydrogenation of propane, air coolers are mainly used in propylene-propane separation distillation towers. When the high-temperature propylene-propane mixed fluid flows through the tube bundle of the air cooler, the ambient air outside the tube bundle absorbs the heat released by the fluid through heat exchange, causing the temperature of the fluid to gradually decrease. As the temperature decreases, the gas phase propylene in the mixed fluid condenses to form liquid phase propylene, thereby achieving separation from propane.

[0004] However, in the high temperature environment of summer, due to the increase in ambient temperature, the temperature of the air as the cooling medium also increases accordingly, resulting in a decrease in the effective temperature difference in the heat exchange process and a significant reduction in the cooling efficiency of the air cooler, which directly leads to the failure of the gas phase propylene to be fully cooled, and part of the propylene still remains in the gas phase, affecting the subsequent separation and purification effects.

[0005] Furthermore, a spray assembly is set in the air cooler to spray cooling water onto the tube bundle to increase the wet bulb temperature and achieve the purpose of cooling.

[0006] The applicant has found that the prior art has at least the following technical problems: The current air cooler design has defects and lacks a water recovery mechanism. Under the strong wind force of the air cooler's fan, the liquid water released by the spray component will be quickly entrained and directly discharged, resulting in a waste of water resources.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The purpose of the present invention is to provide an air cooler for a propane dehydrogenation to propylene process, so as to solve the technical problem that the current air cooler design in the prior art has defects, lacks a water recovery mechanism, and under the strong wind force of the air cooler fan, the liquid water released by the spray assembly will be quickly entrained and directly discharged, resulting in a waste of water resources. The preferred technical solutions among the many technical solutions provided by the present invention can produce a number of technical effects as described below.

[0009] To achieve the above object, the present invention provides the following technical solutions: The present invention provides an air cooler for a propane dehydrogenation to propylene process, comprising a water recovery mechanism and an air cooler shell, wherein the water recovery mechanism comprises a water recovery frame, a water recovery assembly and a water storage assembly, wherein the water recovery frame cover is arranged above the air cooler shell; the water recovery assembly is arranged in a matrix on the water recovery frame and is located on the air outlet path of the air cooler shell, so that the airflow discharged from the air cooler shell can all pass through the water recovery assembly before being discharged; a water collecting tank is arranged below the water recovery assembly, and the water collecting tank is connected to the water storage assembly through a pipeline.

[0010] Preferably, the water recovery component includes a filter element frame, a water-absorbing filter element and a hydrophobic filter element, and the water-absorbing filter element and the hydrophobic filter element are arranged on the filter element frame in sequence along the air flow direction; the water recovery frame is a rectangular structure, and a plurality of mounting grooves are provided on its side panels, and the filter element frame can be detachably mounted on the mounting grooves.

[0011] Preferably, the water collecting tanks are arranged in a one-to-one correspondence at the lower part of the installation groove, and are connected to the water storage assembly through a drainage pipeline, and a valve is provided on the drainage pipeline.

[0012] Preferably, the water recovery frame is connected to the ground via a support frame, and its top surface is an inclined surface.

[0013] Preferably, it further comprises a fan and a tube bundle, the air cooler shell is a hollow structure with openings at both ends, and the tube bundle penetrates the air cooler shell; the fan is located in the air cooler shell, and its blades are located above the tube bundle.

[0014] Preferably, a spray assembly is further included, wherein the spray assembly is located in the air cooler shell, and the nozzle thereof is located below the tube bundle, the spraying direction of the nozzle is toward the tube bundle, and the nozzle is connected to the water storage assembly through a water supply pipeline.

[0015] Preferably, an air inlet hole is provided on the side plate of the air cooler shell at a position corresponding to the nozzle.

[0016] The preferred technical solution of the present invention can at least produce the following technical effects: The present invention effectively avoids the defects of the current air cooler design existing in the prior art, such as the lack of a water recovery mechanism. Under the strong wind force of the air cooler's fan, the liquid water released by the spray assembly will be quickly entrained and directly discharged, resulting in a technical problem of water resource waste. The present invention provides an air cooler for a propane dehydrogenation to propylene process, including a water recovery mechanism and an air cooler shell. The water recovery mechanism includes a water recovery frame, a water recovery assembly and a water storage assembly. The water recovery frame cover is arranged above the air cooler shell; the water recovery assembly is arranged in a matrix on the water recovery frame and is located on the air outlet path of the air cooler shell, so that the airflow discharged from the air cooler shell can all pass through the water recovery assembly before being discharged; a water collecting tank is arranged below the water recovery assembly, and the water collecting tank is connected to the water storage assembly through a pipeline. When the air flow discharged from the air cooler shell passes through the water recovery component, the liquid water therein can be effectively captured and recovered. Subsequently, the liquid water drips from the water recovery component into the water collection tank and is transported to the water storage component through a pipeline for storage for subsequent use, thereby achieving effective recovery and utilization of the liquid water released by the spray component and avoiding waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an air cooler for a propane dehydrogenation process for producing propylene provided by the present invention; Figure 2 The present invention provides a schematic structural diagram of one side plate of a water recovery frame of an air cooler for a process of producing propylene by dehydrogenating propane.

[0019] In the figure: 1. Water recovery frame; 11. Installation groove; 12. Top surface; 13. Water collection tank; 2. Water recovery assembly; 21. Water absorption filter element; 22. Hydrophobic filter element; 23. Filter element frame; 3. Water storage assembly; 4. Air cooler shell; 41. Air inlet; 5. Fan; 51. Fan blades; 52. Transmission assembly; 53. Motor; 6. Tube bundle; 7. Spray assembly; 71. Nozzle; 72. Water pump; 8. Drainage pipeline; 81. Drainage valve; 9. Water supply pipeline; 91. Water supply valve; 10. Support frame. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0021] like Figure 1-Figure 2 As shown, the present invention provides an air cooler for a propane dehydrogenation to propylene process, comprising a water recovery mechanism and an air cooler shell 4, wherein the water recovery mechanism comprises a water recovery frame 1, a water recovery component 2 and a water storage component 3, wherein the water recovery frame 1 is covered above the air cooler shell 4; the water recovery component 2 is arranged in a matrix on the water recovery frame 1 and is located on the air outlet path of the air cooler shell 4, so that the airflow discharged from the air cooler shell 4 can all pass through the water recovery component 2 and then be discharged; a water collecting tank 13 is arranged below the water recovery component 2, and the water collecting tank 13 is connected to the water storage component 3 through a pipeline.

[0022] When the airflow discharged from the air cooler shell 4 passes through the water recovery component 2, the liquid water therein can be effectively captured and recovered. Subsequently, the liquid water drips from the water recovery component 2 into the water collection tank 13 and is transported to the water storage component 3 through a pipeline for storage for subsequent use, thereby achieving effective recovery and utilization of the liquid water released by the spray component 7 and avoiding waste of water resources.

[0023] Furthermore, the water storage component 3 adopts a water storage tank.

[0024] The number of water recovery components 2 can be set according to usage requirements.

[0025] As an optional implementation, the water recovery component 2 includes a filter element frame 23, a water-absorbing filter element 21 and a hydrophobic filter element 22, and the water-absorbing filter element 21 and the hydrophobic filter element 22 are arranged on the filter element frame 23 in sequence along the air flow direction; the water recovery frame 1 is a rectangular structure, and a plurality of mounting grooves 11 are provided on its side panels, and the filter element frame 23 can be detachably installed on the mounting grooves 11.

[0026] The water-absorbing filter element 21 is made of water-absorbing material and can quickly capture liquid water in the airflow.

[0027] The hydrophobic filter element 22 is made of hydrophobic material and only allows dry air to pass through, thereby improving the efficiency of liquid water recovery.

[0028] When the airflow passes through the water recovery component 2, it first passes through the water absorption filter element 21, and the liquid water in the airflow is effectively captured. Then, the airflow continues to flow through the hydrophobic filter element 22. Due to the hydrophobic effect of the hydrophobic filter element 22, the captured liquid water is prevented from evaporating again. When the water absorption filter element 21 reaches saturation, the collected liquid water naturally flows into the water collection tank 13 by gravity difference, so as to achieve effective recovery and utilization of liquid water and avoid waste of water resources.

[0029] As an optional implementation, the water collecting tanks 13 are arranged one-to-one at the lower part of the installation groove 11, and are connected to the water storage assembly 3 through a drainage pipeline 8, and a drainage valve 81 is provided on the drainage pipeline 8.

[0030] Furthermore, the water collecting tanks 13 in the same row are interconnected, and drainage holes are provided at their ends. The drainage holes are connected to the water storage assembly 3 through the drainage pipeline 8, thereby improving the drainage efficiency.

[0031] The drain valve 81 can be set as a manual valve or an electric valve according to usage requirements.

[0032] As an optional implementation, the water recovery frame 1 is connected to the ground through a support frame 10 to improve the stability of the water recovery frame 1. The top surface 12 of the water recovery frame 1 is an inclined surface, which is conducive to drainage.

[0033] As an optional implementation, it also includes a fan 5 and a tube bundle 6. The air cooler shell 4 is a hollow structure with openings at both ends, and the tube bundle 6 penetrates the air cooler shell 4. The fan 5 is located in the air cooler shell 4, and its fan blades 51 are located above the tube bundle 6.

[0034] Furthermore, the fan 5 further includes a motor 53 and a transmission assembly 52, and the motor 53 is transmission-connected to the fan blades 51 via the transmission assembly 52. ​​The fan 5 adopts the existing technology, which will not be described in detail here.

[0035] When the motor 53 is working, the fan blades 51 rotate to generate airflow, sucking ambient air from the lower end opening of the air cooler shell 4 and performing heat exchange through the tube bundle 6 to reduce the temperature of the mixed fluid in the tube bundle 6 .

[0036] As an optional embodiment, a spray assembly 7 is further included. The spray assembly 7 is located in the air cooler shell 4, and its nozzle 71 is located below the tube bundle 6. The spray direction of the nozzle 71 is toward the tube bundle 6, and is connected to the water storage assembly 3 through the water supply pipeline 9.

[0037] Furthermore, the spray assembly 7 further includes a water pump 72, which is disposed on the water supply pipeline 9 so that the cooling water stored in the water storage assembly 3 can be continuously supplied to the nozzle 71 to form a stable spraying effect. The spray assembly 7 can also be connected to other cooling water supply equipment.

[0038] The number of the nozzles 71 can be multiple and they are arranged in sequence along the axial direction of the tube bundle 6 .

[0039] The nozzle 71 sprays cooling water to the tube bundle 6 for heat exchange, and at the same time, it is also entrained by the airflow generated by the fan 5. Through the synergistic effect of the two, the heat exchange effect is further enhanced.

[0040] The water supply valve 91 can be set as a manual valve or an electric valve according to usage requirements.

[0041] As an optional implementation, an air inlet hole 41 is opened at a position corresponding to the nozzle 71 on the side plate of the air cooler shell 4 .

[0042] Furthermore, there are multiple air inlet holes 41 , which are arranged in a matrix.

[0043] This arrangement allows air to be sucked in not only through the lower end opening of the air cooler shell 4, but also through the air inlet hole 41, thereby increasing the flow path and flow rate of the air and improving the cooling effect.

[0044] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0045] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "an example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air cooler for a propane dehydrogenation process to produce propylene, characterized in that: It comprises an air cooler shell and a water recovery mechanism, wherein the water recovery mechanism comprises a water recovery frame, a water recovery component and a water storage component, wherein the water recovery frame cover is arranged above the air cooler shell; the water recovery components are arranged on the water recovery frame in a matrix manner and are located on the air outlet path of the air cooler shell, so that the airflow discharged from the air cooler shell can all pass through the water recovery components before being discharged; A water collecting tank is arranged below the water recovery component, and the water collecting tank is connected to the water storage component through a pipeline.

2. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 1, characterized in that: The water recovery component includes a filter element frame, a water-absorbing filter element and a hydrophobic filter element, and the water-absorbing filter element and the hydrophobic filter element are arranged on the filter element frame in sequence along the air flow direction; the water recovery frame is a rectangular structure, and a plurality of mounting grooves are provided on its side panels, and the filter element frame can be detachably mounted on the mounting grooves.

3. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 2, characterized in that: The water collecting tanks are arranged in a one-to-one correspondence at the lower part of the installation groove, and are connected with the water storage assembly through a drainage pipeline, and a valve is arranged on the drainage pipeline.

4. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 1, characterized in that: The water recovery frame is connected to the ground through a support frame, and its top surface is an inclined surface.

5. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 1, characterized in that: It also includes a fan and a tube bundle. The air cooler shell is a hollow structure with openings at both ends, and the tube bundle penetrates the air cooler shell. The fan is located in the air cooler shell, and its fan blades are located above the tube bundle.

6. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 5, characterized in that: It also includes a spray assembly, which is located in the air cooler shell, and its nozzle is located below the tube bundle. The spray direction of the nozzle is toward the tube bundle, and the nozzle is connected to the water storage assembly through a water supply pipeline.

7. The air cooler for the process of producing propylene by dehydrogenating propane according to claim 6, characterized in that: An air inlet hole is provided on the side plate of the air cooler shell at a position corresponding to the nozzle.

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