Improved spray device for absorption tower production

Abstract

The utility model discloses an improved spraying device of absorption tower production relates to urea production technical field, including one end in the spray pipeline of absorption tower in, and this end is connected with the liquid storage cylinder that is provided with, is equipped with a plurality of nozzles on the liquid storage cylinder, to be used for the spray liquid in the liquid storage cylinder is sprayed to absorption tower, the spray pipeline is outside one section and is provided with heating element, and this section and spray pipeline jointly constitute heating channel, to when the spray liquid is in the spray pipeline and flows, rely on heating channel and realize the heating treatment of spray liquid to the utility model discloses a heating channel is set up, realized the dynamic heating treatment of spray liquid. This design can provide thermal energy in the process of spray liquid flow continuously, effectively solve the crystallization blockage problem of traditional absorption tower spraying system because of the liquid temperature is too low. Meanwhile, heating treatment can also improve the spray liquid activity, enhances the absorption efficiency of gas component such as ammonia gas.

Description

Technical Field

[0001] This utility model relates to the field of urea production technology, specifically to an improved spraying device for absorption tower production. Background Technology

[0002] In urea production, the gas separated from the liquid level tank of the low-pressure ammonium carbamate condenser enters the atmospheric pressure absorption tower. In the middle and upper parts of the atmospheric pressure absorption tower, there are dilute process condensate and unabsorbed NH3 in the inert gas of the steam condenser washing. Due to the influence of the production process, the ammonia content in the gas phase of the ammonia tank and urea tank is relatively high, resulting in a high ammonia content in the tail gas of the venting stack. This not only causes damage to the ammonia content, but also causes environmental pollution.

[0003] A search revealed that patent document CN217287837U discloses a device for reducing ammonia emissions in a urea production process. This device includes an atmospheric pressure absorption tower; a condensate spray structure including a plate heat exchanger, a flow regulating device, and nozzle B; a circulating spray structure including nozzle A and a circulating pump; a hydrolysis system; and an ammonia tank. The top of the atmospheric pressure absorption tower is connected to a vent cylinder via a pipe. Nozzles A and B are installed inside the atmospheric pressure absorption tower. Nozzle A is connected to the bottom of the atmospheric pressure absorption tower via a pipe, on which a circulating pump is installed. Nozzle B is connected to the plate heat exchanger in the steam condensate system via a pipe, on which a flow regulating device is installed. The atmospheric pressure absorption tower is connected to a first-stage evaporator-condenser and a second-stage evaporator-condenser in the evaporation system via pipes. The atmospheric pressure absorption tower is connected to the ammonia tank, which is connected to the hydrolysis system via a transfer pump. Nozzle C is also installed inside the atmospheric pressure absorption tower, and nozzle C is connected to the low-pressure absorption tower in the urea production process via a pipe.

[0004] In operation, the aforementioned device, through its three spray heads and related structures, gradually reduces the ammonia concentration in the spray liquid within the absorption tower, thereby enhancing the absorption of ammonia and reducing the ammonia content in the venting cylinder. However, during operation, spray head C, connected to the low-pressure absorption tower (containing ammonium carbamate solution), is prone to crystallization and blockage of the spray nozzles within a short period, requiring frequent shutdowns for cleaning. This disrupts normal production and reduces efficiency.

[0005] To address these issues, we propose an improved spraying device for absorption tower production. Utility Model Content

[0006] The purpose of this utility model is to solve the problems in the prior art by proposing an improved spraying device for absorption tower production. This spraying device sets a heating element outside the spraying pipe, and the heating element and a section of the spraying pipe together form a heating channel for heating the spraying liquid, so as to prevent crystallization and blockage when the spraying liquid flows into the nozzle and ensure the normal spraying of the spraying liquid.

[0007] To solve the above problems, this utility model provides the following technical solution: An improved spraying device for absorption tower production includes a spraying pipe with one end located inside the absorption tower, and a liquid storage tank connected to the same end. The liquid storage tank is equipped with several nozzles for spraying the spraying liquid inside the liquid storage tank into the absorption tower. A heating element is provided on the outside of a section of the spraying pipe, and this section together with the spraying pipe forms a heating channel to heat the spraying liquid as it flows inside the spraying pipe.

[0008] As a further embodiment of this utility model: the heating element includes a heat-conducting pipe inside for the passage of a heat-conducting fluid medium, the heat-conducting pipe being arranged in a spiral shape and sleeved on the outside of the spray pipe.

[0009] As a further embodiment of this utility model: the two ends of the heat pipe are arranged vertically, with an inlet connector at the lower end of the heat pipe and an outlet connector at the upper end of the heat pipe, so that the heat fluid medium passes through the heat pipe from bottom to top.

[0010] As a further embodiment of this invention, the spraying device also includes an insulation component for covering the heat-conducting pipe.

[0011] As a further embodiment of this utility model: the insulation component includes two semi-circular insulation plates for forming a clamp, both semi-circular insulation plates are covered outside the heat-conducting pipe, and the two semi-circular insulation plates are detachably connected through connecting ears on them.

[0012] As a further embodiment of this utility model: the annular clamp structure formed by the two semi-circular insulation plates is sleeved on the outside of the heat-conducting pipe, so that the annular clamp structure and the heat-conducting pipe together constitute an adjustable whole that can slide along the outside of the spray pipe. The semi-circular insulation plates are provided with fastening bolts, and one end of the fastening bolts can extend into the inner side of the semi-circular insulation plates and abut against the outer wall of the spray pipe to achieve locking of the adjustable whole.

[0013] As a further embodiment of this invention: the nozzles are configured as multiple nozzles and are evenly distributed along the length of the liquid storage cylinder.

[0014] As a further embodiment of this invention: multiple nozzles are disposed at the bottom of the liquid storage cylinder.

[0015] As a further embodiment of this utility model: the liquid storage cylinder has a closed end and an open end, and a plug is detachably provided at the open end.

[0016] As a further embodiment of this utility model: the spraying device also includes a cleaning tool, which includes a rotating shaft with one end coaxially detachable and installable on the inner wall of the liquid storage cylinder. The rotating shaft is provided with a plurality of elastic elements, and the elastic elements are provided with scrapers. The scrapers rely on the elastic elements to achieve contact with the inner wall of the liquid storage cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. By incorporating a heating channel, dynamic heating of the spray liquid is achieved. This design continuously provides heat energy during the spray liquid's flow, effectively solving the crystallization and blockage problem caused by excessively low liquid temperature in traditional absorption tower spray systems. Simultaneously, the heating treatment also enhances the activity of the spray liquid, increasing its absorption efficiency for gases such as ammonia. By integrating the heating section into the spray pipe, the complexity of the system structure due to additional heating equipment is avoided, resulting in a compact design advantage.

[0018] 2. The use of spiral heat-conducting pipes fitted around the outside of the spray pipes significantly increases the heat transfer area. Simultaneously, the spiral shape induces turbulence in the fluid, further improving heat exchange efficiency. Furthermore, the spiral structure has higher mechanical strength, can withstand greater steam pressure, and prevents pipe deformation.

[0019] 3. By designing the fluid medium to flow from bottom to top, and utilizing the balanced heat transfer of the heat medium from bottom to top, the transport time of the heat fluid medium in the heat pipe can be effectively increased, thereby improving the heat transfer effect.

[0020] 4. With the addition of insulation components, the heat loss of the system can be reduced as much as possible, and the insulation design can also maintain the temperature stability of the spray liquid, which is especially suitable for low-temperature conditions in winter and prevents secondary crystallization caused by temperature difference.

[0021] 5. The split semi-circular insulation board adopts a clamp connection structure, which can be quickly disassembled and assembled without stopping the machine. It can be adapted to the renovation project by replacing the standard modular insulation board.

[0022] 6. The adjustable clamp structure allows the position of the heating section to be dynamically adjusted according to process requirements, and the heating of the low-temperature area can be intensified by moving the position of the heating section.

[0023] 7. The removable plug design allows for easy cleaning of the inside of the liquid storage tank. During cleaning and maintenance, sediment inside the liquid storage tank can be quickly removed, reducing unplanned downtime losses. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the insulation component in this utility model; Figure 3 This is a cross-sectional structural diagram of the cleaning tool in this utility model.

[0026] In the diagram: 1. Spray pipe; 2. Liquid storage tank; 3. Nozzle; 4. Heat conduction pipe; 5. Inlet connector; 6. Outlet connector; 7. Semi-circular insulation board; 701. Connecting lug; 8. Fastening bolt; 9. Plug. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1-2 As shown, an improved spraying device for absorption tower production is disclosed. This spraying device can be used on transport pipelines in urea production, and can also be used in the technical solution with authorization announcement number CN217287837U. This article describes the operation of the nozzle C in the cited technical solution as follows: The improved spraying device includes a spraying pipe 1 with one end located inside the atmospheric pressure absorption tower. A liquid storage tank 2 is connected to this end. Multiple nozzles 3 are installed at the bottom of the liquid storage tank 2 and are arranged along the length of the liquid storage tank 2. The other end of the spraying pipe 1 is connected to a low-pressure absorption tower to introduce ammonia water with a lower concentration from the low-pressure absorption tower into the atmospheric pressure absorption tower to continue absorbing ammonia gas and reduce the consumption of condensate.

[0029] However, during the spray liquid transportation process, the ammonium carbamate solution in the low-pressure absorption tower also enters the spray pipe 1. When this ammonium carbamate solution flows to the nozzle 3, it is prone to crystallization and blockage at the nozzle 3, affecting the normal spraying operation of the nozzle 3. Therefore, this application installs a heating element on the outside of the spray pipe 1 to heat a section of the spray pipe 1. This section, together with the spray pipe 1, forms a heating channel. When the spray liquid passes through this heating channel, it is heated, that is, its temperature is increased, reducing the crystallization and blockage at the nozzle 3 and ensuring the normal operation of the nozzle 3.

[0030] It should be noted that the length of the heating channel can be adapted to the actual use, as long as it can heat the spray liquid to a certain temperature.

[0031] like Figure 2 As shown, specifically, the heating element includes a heat-conducting pipe 4, which is arranged in a spiral shape and fitted around the outside of the spray pipe 1. The two ends of the heat-conducting pipe 4 are arranged vertically, with an outlet connector 6 at the upper end and an inlet connector 5 at the lower end. In this design, a hot fluid medium carrying a certain amount of heat (the amount of heat can be set according to the actual application) enters the heat-conducting pipe 4 through the lower inlet connector 5 and flows out through the outlet connector 6. During this process, the spiral-shaped heat-conducting pipe 4 transfers heat to the spray pipe 1 through heat transfer, thereby achieving the heating treatment of the spray liquid inside the spray pipe 1. This application, by setting the heat-conducting pipe 4 in a spiral shape, can maximize the contact with the spray pipe 1 within a certain length of heating channel design, thus maximizing the heat conduction effect and efficiency. It should be noted that by transporting the hot fluid medium from bottom to top, the transport time of the hot fluid medium within the heat-conducting pipe 4 can be effectively increased, improving the heat transfer effect. Meanwhile, the type of heat fluid medium passing through the heat pipe 4 can be either liquid or gas, and this paper does not limit it to this.

[0032] To reduce energy loss, this application adds an insulation component for covering and insulating the heat-conducting pipe 4. The insulation component includes two semi-circular insulation plates 7, which can be made of materials such as ceramic fiber or nano-aerogel. The two semi-circular insulation plates 7 are arranged opposite each other, and each of them has a connecting lug 701 at its near end, which connects the two semi-circular insulation plates 7. In use, both semi-circular insulation plates 7 cover the outside of the heat-conducting pipe 4 and are connected in a clamp-like manner by the connecting lug 701.

[0033] In some embodiments, an annular clamp structure formed by two semi-circular insulation plates 7 is fitted onto the outside of the heat-conducting pipe 4, so that the annular clamp structure and the heat-conducting pipe 4 constitute an adjustable assembly that can slide outside the spray pipe 1. At the same time, a fastening bolt 8 is provided on the semi-circular insulation plate 7, and one end of the fastening bolt 8 can extend into the inner side of the semi-circular insulation plate 7 and abut against the outer wall of the spray pipe 1. When the adjustable assembly is driven to move to the corresponding position on the spray pipe 1, the fastening bolt 8 is driven to tighten until one end of the fastening bolt 8 abuts against the outside of the spray pipe 1. The adjustable assembly can be locked by the friction between the end of the fastening bolt 8 and the outside of the spray pipe 1.

[0034] Furthermore, if crystals or other impurities accumulate inside the liquid storage cylinder 2, it can be equipped with a closed end and an open end to facilitate periodic cleaning. A detachable plug 9 is installed at the open end to seal it. During cleaning, the plug 9 at the open end is removed, and cleaning tools can be used to clean the inside of the liquid storage cylinder 2.

[0035] like Figure 3 As shown, this application designs the cleaning tool as follows: The cleaning tool includes a rotating shaft 10, one end of which can be provided with a cross pin. A mounting block is rotatably provided at the center of the inner wall of the end of the liquid storage cylinder 2. A cross slot is provided on the mounting block. The rotating shaft 10 can achieve coaxial rotational connection with the liquid storage cylinder 2 by the cooperation of the cross pin and the cross slot. Several elastic elements 11 are provided on the rotating shaft 10, and scrapers 12 are provided on the elastic elements 11. Under the elastic action of these elastic elements 11, the scrapers 12 can abut against the inner wall of the liquid storage cylinder 2. Subsequently, driving the rotating shaft 10 to rotate will cause the scrapers 12 to perform a circumferential scraping action on the inner wall of the liquid storage cylinder 2. It should be noted that after the rotating shaft 10 is installed on the liquid storage cylinder 2, the scrapers 12 can be installed on the rotating shaft 10 by snap-fit ​​or fastening, maintaining the scrapers 12 in contact with the inner wall of the liquid storage cylinder 2.

[0036] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An improved spraying device for absorption tower production, characterized in that, It includes a spray pipe (1) with one end located inside the absorption tower, and a liquid storage tank (2) connected to the end. The liquid storage tank (2) is provided with several nozzles (3) for spraying the spray liquid in the liquid storage tank (2) into the absorption tower. A heating element is provided on the outside of a section of the spray pipe (1). This section and the spray pipe (1) together form a heating channel so that the spray liquid can be heated by the heating channel when it flows in the spray pipe (1). The heating element includes a heat-conducting pipe (4) inside for the passage of a heat-conducting fluid medium. The heat-conducting pipe (4) is arranged in a spiral shape and is sleeved on the outside of the spray pipe (1). The two ends of the heat pipe (4) are arranged vertically, and an inlet connector (5) is provided at the end of the lower heat pipe (4) and an outlet connector (6) is provided at the end of the upper heat pipe (4) so ​​that the hot fluid medium passes through the heat pipe (4) from bottom to top.

2. The improved spray device for absorption tower production according to claim 1, characterized in that, The spraying device also includes an insulation component for covering the heat-conducting pipe (4).

3. An improved spraying device for absorption tower production according to claim 2, characterized in that, The insulation component includes two semi-circular insulation plates (7) that form a clamp. Both semi-circular insulation plates (7) are covered outside the heat-conducting pipe (4), and the two semi-circular insulation plates (7) are detachably connected by connecting ears (701) on them.

4. An improved spraying device for absorption tower production according to claim 3, characterized in that, The annular clamp structure formed by the two semi-circular insulation plates (7) is fitted onto the outside of the heat-conducting pipe (4) so ​​that the annular clamp structure and the heat-conducting pipe (4) together form an adjustable whole that can slide along the outside of the spray pipe (1). The semi-circular insulation plate (7) is provided with a fastening bolt (8), and one end of the fastening bolt (8) can extend into the inside of the semi-circular insulation plate (7) and abut against the outer wall of the spray pipe (1) to achieve locking of the adjustable whole.

5. An improved spraying device for absorption tower production according to any one of claims 1-4, characterized in that, The nozzles (3) are configured as multiple and evenly distributed along the length of the liquid storage cylinder (2).

6. An improved spraying device for absorption tower production according to claim 5, characterized in that, Multiple nozzles (3) are located at the bottom of the liquid storage cylinder (2).

7. An improved spraying device for absorption tower production according to any one of claims 1-4, characterized in that, The liquid storage cylinder (2) has a closed end and an open end, and a plug (9) is detachably provided at the open end.

8. An improved spraying device for absorption tower production according to claim 7, characterized in that, The spraying device also includes a cleaning tool, which includes a rotating shaft (10) that can be coaxially detached and installed on the inner wall of the liquid storage cylinder (2). The rotating shaft (10) is provided with a number of elastic elements (11), and a scraper (12) is provided on the elastic elements (11). The scraper (12) relies on the elastic elements (11) to achieve contact with the inner wall of the liquid storage cylinder (2).

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