A cooler flushing device and production system

Abstract

The application provides a cooler flushing device and a production system. The cooler flushing device comprises a condensate pipeline, a first end of the condensate pipeline is used for connecting a condensate supply source; a plurality of spray heads, the plurality of spray heads are arranged in the cooler and are in communication with a second end of the condensate pipeline, a range of the plurality of spray heads can cover cooling plates in the cooler; a third end of a blowing pipeline is used for connecting a gas supply source, a fourth end is in communication with the condensate pipeline; a first drain pipeline is arranged at a bottom of the condensate pipeline in a vertical direction and is in communication with the condensate pipeline, a first drain valve is arranged on the first drain pipeline, and the gas of the gas supply source can discharge the condensate in the condensate pipeline from the first drain pipeline through the blowing pipeline. The technical scheme of the application can realize online cleaning of a urea prilling machine cooler without relying on manual entry into the cooler, thereby reducing safety risks, reducing downtime and reducing maintenance costs.

Description

Technical Field

[0001] This application relates to the field of urea production equipment technology, and in particular to a cooler flushing device and production system. Background Technology

[0002] During operation, existing urea granulators are subject to frequent online cleaning due to unstable granulation output. In the traditional cleaning process, the granulator must be stopped first, and then a person must manually enter the cooler to perform the cleaning operation.

[0003] Because the cooler is a confined space with high temperature and humidity, it poses safety hazards to operators, including the risk of slipping, bumping, and suffocation due to poor air circulation. Furthermore, manual cleaning relies on shutting down the granulator, and each cleaning operation interrupts production, significantly impacting overall capacity. In winter, temporary pipe cleaning can lead to water freezing inside the pipes, causing ruptures and significantly increasing equipment maintenance frequency and costs. Utility Model Content

[0004] The purpose of this application is to provide a cooler flushing device to solve the problem of how to achieve efficient, safe and reliable online cleaning of the urea granulator cooler without relying on manual entry into the cooler, so as to reduce safety risks, reduce downtime, increase production capacity and reduce maintenance costs.

[0005] To address the aforementioned technical problems, this application provides the following technical solutions:

[0006] This application provides a cooler flushing device, comprising: a condensate pipeline, the first end of which is connected to a condensate supply source; multiple nozzles disposed inside the cooler and connected to the second end of the condensate pipeline, the area of ​​which the multiple nozzles can cover the cooling plate inside the cooler; a purge pipeline, the third end of which is connected to a gas supply source and the fourth end of which is connected to the condensate pipeline; and a first drain pipeline, which is vertically disposed at the bottom of the condensate pipeline and connected to the condensate pipeline, the first drain pipeline being provided with a first drain valve, and the gas from the gas supply source can discharge the condensate in the condensate pipeline through the purge pipeline via the first drain pipeline.

[0007] In some embodiments of this application, the condensate pipeline includes a main pipeline and multiple branch pipelines, the multiple branch pipelines being respectively connected to the main pipeline, and the multiple nozzles being evenly distributed on the multiple branch pipelines; each branch pipeline is provided with a first valve on the side near the connection with the main pipeline, the first valve being used to control the on / off connection between the branch pipeline and the main pipeline.

[0008] In some embodiments of this application, the branch pipelines are inclined along the vertical direction, and the end of the branch pipeline away from its connection with the main pipeline is higher in the vertical direction than the end of the branch pipeline connected to the main pipeline; the main pipeline is a U-shaped structure along the vertical direction, the first drain pipeline is connected to the bottom of the main pipeline, and a plurality of the branch pipelines are higher in the vertical direction than the end of the first drain pipeline connected to the main pipeline.

[0009] In some embodiments of this application, a second valve and a third valve are provided on the side of the main pipeline near the condensate supply source. The second valve and the third valve are connected in series and are used to control the connection and disconnection between the condensate supply source and the main pipeline.

[0010] In some embodiments of this application, the cooler flushing device further includes: a second drain line, which is connected to the main line between the second valve and the third valve, and a second drain valve is provided on the second drain line.

[0011] In some embodiments of this application, the purge line is connected to the main line, and a fourth valve is provided on the purge line for controlling the connection and disconnection between the purge line and the main line.

[0012] In some embodiments of this application, the cooler flushing device further includes: a pressure detection device and a flow detection device, wherein the pressure detection device and the flow detection device are respectively installed on the purge line and the condensate line; and a control device, wherein the control device is connected to the pressure detection device, the flow detection device, the second valve, the third valve and the fourth valve respectively, and the control device controls the opening degree of the second valve, the third valve and the fourth valve according to the detection signals of the pressure detection device and the flow detection device.

[0013] In some embodiments of this application, the condensate is water at 45°C-50°C, and the gas is dry compressed air.

[0014] In some embodiments of this application, the cooler flushing device further includes a heating element that wraps around and covers the outer periphery of the condensate pipeline, the heating element being used to heat the condensate pipeline.

[0015] This application also provides a production system including the above-described cooler rinsing device.

[0016] Compared to existing technologies, the cooler flushing device provided in this application connects to an external condensate source via a condensate pipeline that extends into the cooler, stably delivering condensate to the cleaning area. Multiple nozzles covering the cooling plates within the cooler ensure comprehensive and uniform flushing of the plate surface, removing urea deposits and crystals. This not only improves cleaning efficiency but also enables continuous online cleaning, reducing downtime and increasing overall capacity utilization. Furthermore, it eliminates the need for manual entry into confined spaces, significantly reducing the probability of accidents. A purge pipeline connected to a gas source and linked to the condensate pipeline, with a first drain valve at the bottom of the condensate pipeline, provides a drainage channel at the lowest point. After flushing, pressurized purge gas is introduced to expel residual liquid, rapidly emptying the pipeline and ensuring complete removal of condensate and purge residue, preventing liquid accumulation. The combined action of purge and drain ensures no residual water in the pipeline, effectively preventing pipe freezing and cracking in low-temperature environments. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0018] Figure 1 A schematic diagram of the structure of the cooler flushing device provided in the embodiments of this application is shown.

[0019] Figure 2 A schematic front view of the cooler flushing device provided in an embodiment of this application is shown;

[0020] Explanation of icon numbers:

[0021] 1. Condensate line; 101. Main line; 102. Branch line; 103. First valve; 104. Second valve; 105. Third valve; 2. Nozzle; 3. Purge line; 301. Fourth valve; 4. First drain line; 401. First drain valve; 5. Second drain line; 501. Second drain valve;

[0022] 10. Cooler; 1001. Cooling plate; 20. Condensate supply source; 30. Gas supply source. Detailed Implementation

[0023] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0024] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0025] Example 1

[0026] This application provides a cooler flushing device, such as... Figure 1 and Figure 2 As shown, it includes: a condensate line 1, the first end of which is connected to a condensate supply source 20; multiple nozzles 2, which are disposed inside the cooler 10 and connected to the second end of the condensate line 1, the range of which can cover the cooling plate 1001 inside the cooler 10; a purge line 3, the third end of which is connected to a gas supply source 30, and the fourth end of which is connected to the condensate line 1; and a first drain line 4, which is vertically disposed at the bottom of the condensate line 1 and connected to the condensate line 1, and is equipped with a first drain valve 401, so that the gas from the gas supply source 30 can discharge the condensate in the condensate line 1 through the purge line 3 and the first drain line 4.

[0027] The first end of the condensate line 1 is connected to an external or workshop condensate supply source 20, such as a high-pressure water system or a cleaning fluid storage tank, and the second end extends into the interior of the cooler 10, where it can be fixedly installed at the top inside the cooler 10. The line can be made of corrosion-resistant materials, such as stainless steel or Hastelloy, to withstand corrosion from condensate and acidic residues.

[0028] Multiple nozzles 2 are evenly arranged inside the cooler 10, installed above or around the cooling plate 1001, and connected to the condensate line 1. The nozzles 2 can adopt a fan-shaped or rotating nozzle design to ensure that the spray coverage completely covers the entire surface of the cooling plate 1001, achieving thorough cleaning without dead angles. Optionally, the nozzles 2 can be configured with an adjustable angle or a timed rotation structure to further improve cleaning uniformity. The nozzles 2 can be made of silicon nitride ceramic material to improve corrosion resistance.

[0029] The third end of the purge line 3 is connected to a gas supply source 30, such as a compressed air or nitrogen system, and the fourth end is connected to the condensate line 1 at an appropriate location. After flushing is completed, the gas supply source 30 can be turned on, and high-pressure gas enters the condensate line 1 through the purge line 3, pushing the residual liquid out.

[0030] The first drain line 4 is vertically positioned at the lowest point of the condensate line 1 and is connected to it to drain accumulated liquid. A first drain valve 401 is installed on the drain line. The first drain valve 401 can be manually or automatically controlled; it is closed during normal operation and opens after purging. During the purging phase, gas pushes the condensate out of the first drain line 4 to remove residual liquid from the line. The purging function forces the drainage of accumulated liquid after each cleaning, preventing residual liquid from freezing and expanding at low temperatures, which could lead to pipe rupture.

[0031] The cooler flushing device provided in this embodiment connects to an external condensate source via a condensate pipeline 1, extending into the cooler 10 to stably deliver condensate to the cleaning area. Multiple nozzles 2 covering the cooling plate 1001 are installed inside the cooler 10 to achieve comprehensive and uniform flushing of the cooling plate 1001 surface, removing urea deposits and crystals. This not only improves the cleaning effect but also enables online cleaning without shutting down the system, reducing downtime caused by cleaning, increasing overall capacity utilization, and eliminating the need for manual entry into confined spaces, significantly reducing the probability of safety accidents. A purge pipeline 3 connects to a gas source and is linked to the condensate pipeline 1. A first drain pipeline 4 with a first drain valve 401 is installed at the bottom of the condensate pipeline 1 to provide a drainage channel at the lowest point. After flushing, pressurized purge gas is introduced to push residual liquid out, achieving rapid emptying of the pipeline and ensuring complete removal of condensate and purge residue, preventing liquid accumulation. The combined action of purge and drain ensures no residual water in the pipeline, effectively preventing pipeline freezing and cracking in low-temperature environments.

[0032] In some embodiments, such as Figure 1 As shown, the condensate pipeline 1 includes a main pipeline 101 and multiple branch pipelines 102. The multiple branch pipelines 102 are respectively connected to the main pipeline 101, and multiple nozzles 2 are evenly distributed on the multiple branch pipelines 102. Each branch pipeline 102 is provided with a first valve 103 near the side connected to the main pipeline 101. The first valve 103 is used to control the on / off connection between the branch pipeline 102 and the main pipeline 101.

[0033] The condensate pipeline 1 consists of a main pipeline 101 and multiple branch pipelines 102. The main pipeline 101 is introduced from an external condensate supply source 20 and can be laid along the outside of the cooler 10, serving as the main channel for liquid transportation. The multiple branch pipelines 102 branch off from the main pipeline 101, distributed radially or in parallel, extending to different areas inside the cooler 10. Multiple nozzles 2 are evenly arranged on each branch pipeline 102, with the nozzles 2 facing the corresponding surface of the cooling plate 1001. The nozzles 2 can be oriented according to the geometry of the cooling plate 1001 to ensure that the spray angle covers areas prone to material accumulation.

[0034] At the root of each branch pipeline 102 connecting to the main pipeline 101, i.e., on the side of the branch pipeline 102 closest to the main pipeline 101, a first valve 103 is installed, such as a ball valve, solenoid valve, or pneumatic valve. The first valve 103 is used to independently control the on / off state of each branch pipeline 102, realizing the start / stop control of the two groups of sprinklers in different areas. The first valve 103 can be operated manually or connected to an automatic control system (such as a PLC) to realize automatic opening and closing at timed, time-sharing, and area-specific times.

[0035] Through the structure of the main pipeline 101, branch pipelines 102, and zone valves, specific branch pipelines 102 can be selectively opened for local cleaning according to the degree of scaling or operating status of different areas of the cooler 10, thus avoiding the waste of resources caused by indiscriminate flushing of the entire area.

[0036] In some embodiments, such as Figure 2 As shown, the branch pipeline 102 is inclined in the vertical direction, and the end of the branch pipeline 102 that is away from its connection with the main pipeline 101 is higher in the vertical direction than the end of the branch pipeline 102 that is connected with the main pipeline 101; the main pipeline 101 has a U-shaped structure in the vertical direction, and the first drain pipeline 4 is connected to the bottom of the main pipeline 101, and multiple branch pipelines 102 are higher in the vertical direction than the end of the first drain pipeline 4 that is connected with the main pipeline 101.

[0037] Multiple branch lines 102 extend from the main line 101 and are arranged at an angle in the vertical direction. Their ends, i.e., the ends furthest from the connection point with the main line 101, are higher than their connection point with the main line 101. For example, a branch line 102 can start from the middle access point of the cooler 10 and extend upwards at an angle to the upper area of ​​the cooler 10, with the nozzles 2 evenly distributed along the inclined section. This arrangement from low to high creates a natural slope for the branch lines 102.

[0038] The main pipeline 101 is arranged in a vertical U-shape, with the lowest point of the U-shape located at the bottom bend, serving as the lowest liquid level collection area for the entire condensate pipeline system. The first drain line 4 is connected vertically or obliquely to the lowest point of the U-shape of the main pipeline 101 and is in communication with it.

[0039] The first drain line 4 is equipped with a first drain valve 401, which is used to open after cleaning to drain the residual liquid in the line. All connection points of the branch lines 102 to the main line 101 are located above the drain connection point, ensuring that the liquid in all branch lines 102 can flow to the bottom of the main line 101 by gravity.

[0040] After flushing, the connection between the condensate supply source 20 and the main pipeline 101 can be shut off to cut off the liquid supply. The liquid remaining in the main pipeline 101 and branch pipeline 102, under the influence of gravity, can flow back to the main pipeline 101 along the inclined branch pipeline 102 and continue flowing towards the lowest point of the U-shape. Then, the purge line 3 can be opened to introduce purge gas, pushing the residual liquid towards the lowest point, and finally discharging it through the first drain line 4, achieving a complete emptying of the entire system.

[0041] The inclined branch line 102 allows residual liquid to naturally flow back to the main line 101 under gravity. The U-shaped main line 101 collects all liquid at the lowest point, enabling initial drainage without additional power and significantly reducing residue. In conjunction with the purge line 3, it ensures no dead zones in the condensate line 1, allowing all sections to be completely drained, preventing freezing accidents, ensuring safe operation of the unit in cold seasons, and significantly reducing maintenance frequency.

[0042] In some embodiments, a second valve 104 and a third valve 105 are provided on the side of the main pipeline 101 near the condensate supply source 20. The second valve 104 and the third valve 105 are connected in series and are used to control the connection and disconnection between the condensate supply source 20 and the main pipeline 101.

[0043] At the first end of the main pipeline 101, near the connection to the condensate supply source 20, two valves are installed: a second valve 104 and a third valve 105. The two valves are installed in series along the fluid flow direction; for example, the condensate first passes through the second valve 104, then the third valve 105, and then enters the main pipeline 101. Valve types can include ball valves, gate valves, solenoid valves, or pneumatic valves, and manual or automatic control can be selected according to the required level of automation.

[0044] By adopting a dual-valve series structure, a dual shut-off effect is formed. Even if one valve leaks slightly, the other can still effectively block the medium, greatly reducing the risk of condensate accidentally entering the cooler 10, avoiding freezing accidents, ensuring the safe operation of the device in the cold season, and significantly reducing the maintenance frequency.

[0045] In some embodiments, the cooler flushing device further includes: a second drain line 5, which is connected to the main line 101 between the second valve 104 and the third valve 105, and a second drain valve 501 is provided on the second drain line 5.

[0046] The second drain line 5 extends from the section between the second valve 104 and the third valve 105 and connects to the main drain line 101 of that section. A second drain valve 501 is installed on the second drain line 5 to control its on / off state. The second drain valve 501 can be a manual ball valve, a needle valve, or an automatic drain valve, facilitating periodic or automatic draining operations by the operator.

[0047] Because condensate may remain in the pipe section between the second valve 104 and the third valve 105 when the pipe is closed, it is prone to freezing and expansion at low temperatures, which could lead to valve seal damage or pipe rupture. The second drain valve 501 can completely drain the liquid in this local cavity, eliminating dead zone liquid accumulation and avoiding the risk of local freezing damage.

[0048] In some embodiments, the purge line 3 is connected to the main line 101, and the purge line 3 is provided with a fourth valve 301, which is used to control the connection and disconnection between the purge line 3 and the main line 101.

[0049] The third end of the purge line 3 is connected to the gas supply source 30, such as compressed air, nitrogen, or a plant instrument air system, and the fourth end is directly connected to the main line 101. Its connection location can be set in different areas of the main line 101 as needed, typically on the side near the condensate supply source 20. It can be selectively connected between the second valve 104 and the third valve 105, or downstream of the second valve 104 and the third valve 105.

[0050] When the purge line 3 is connected between the second valve 104 and the third valve 105, if it is necessary to drain the liquid accumulated between the second valve 104 and the third valve 105, the second valve 104 and the third valve 105 can be closed first. Then, gas can be introduced through the purge line 3 to drain the residual liquid in this section of the pipe through the second drain line 5, achieving partial purging. If it is necessary to purge the entire main pipeline 101, the second valve 104 can be kept closed, the third valve 105 can be opened, and then the purge line 3 can be opened to allow the gas to advance downstream along the main pipeline 101, completely draining the residual liquid in the main pipeline 101 and the branch pipeline 102 through the first drain line 4.

[0051] When the purge line 3 is connected downstream of the second valve 104 and the third valve 105, if the entire main pipeline 101 needs to be purged, the second valve 104 and the third valve 105 can be closed first. Then, gas can be introduced through the purge line 3 to push the residual liquid in the main pipeline 101 towards the first drain line 4, completing the overall system purging. If the section between the second valve 104 and the third valve 105 needs to be purged, the second valve 104 can be kept closed and the third valve 105 opened, and the accumulated liquid in this section can be discharged through the second drain line 5 using the purge gas.

[0052] A fourth valve 301 is provided on the purge line 3 to control whether the purge gas enters the main line 101. The fourth valve 301 can be a manual ball valve, a solenoid valve, or a pneumatic shut-off valve. In the non-purge state, the fourth valve 301 remains closed to prevent gas from accidentally entering or condensate from flowing back into the gas line.

[0053] By connecting the purging line 3 to the main line 101 and installing an on / off mechanism controlled by the fourth valve 301 on the purging line 3, safe, controllable, and efficient management of the purging process is achieved. This not only ensures the complete removal of residual liquid after flushing, improving the antifreeze properties and reliability of the device, but also effectively prevents cross-contamination between the gas and liquid systems.

[0054] In some embodiments, the cooler flushing device further includes: a pressure detection device and a flow detection device (not shown in the figures), both the purge line 3 and the condensate line 1 are equipped with pressure detection devices and flow detection devices; and a control device, which is connected to the pressure detection device, the flow detection device, the second valve 104, the third valve 105 and the fourth valve 301 respectively, and controls the opening degree of the second valve 104, the third valve 105 and the fourth valve 301 according to the detection signals of the pressure detection device and the flow detection device.

[0055] Pressure sensors or pressure gauges are installed as pressure detection devices on the condensate line 1 and the purge line 3, respectively. For example, on the condensate line 1, they are installed between the second valve 104 and the third valve 105, or at the inlet section of the main line 101. On the purge line 3, they are installed upstream or downstream of the fourth valve 301. The pressure detection devices are used to monitor changes in the condensate supply pressure and the purge gas pressure in real time.

[0056] Flow meters are installed on the condensate line 1 and the purge line 3. These include gas flow meters such as ultrasonic or differential pressure gas flow meters, and liquid flow meters such as turbine or electromagnetic flow meters. For example, on the condensate line 1, a flow meter is installed near the inlet of the main line 101 to monitor the total condensate flow rate. On the purge line 3, a flow meter is installed downstream of the fourth valve 301 to monitor the purge gas flow rate.

[0057] The control device can be a PLC (Programmable Logic Controller), DCS system, or embedded controller, possessing data acquisition, logic operation, and output control functions. The control device connects to the pressure detection device, flow detection device, second valve 104, third valve 105, and fourth valve 301 via signal lines or wireless communication. The control device can dynamically adjust the opening degree of the second valve 104, third valve 105, and fourth valve 301 based on the detection signals.

[0058] After the urea granulator enters the online cleaning mode, the control device sends a signal to sequentially open the second valve 104 and the third valve 105. The condensate flows through the main pipeline 101 into the branch pipeline 102. Pressure and flow rate are monitored to confirm normal condensate flow. If there is no flow or abnormal pressure, an alarm is triggered and the valves are closed. After flushing, the second valve 104 and the third valve 105 are closed, and the fourth valve 301 is opened. Based on the pressure and flow rate data of the purge pipeline 3, the opening of the fourth valve 301 is adjusted to control the purge gas flow rate, ensuring effective removal of residual liquid. The control device can employ a pulse spray program of 15 seconds followed by a 10-second pause, with periodic start and stop achieved through PLC programming.

[0059] By installing pressure and flow detection devices on the condensate line 1 and the purge line 3, and configuring a control device linked to them, comprehensive perception, intelligent decision-making, and precise execution of the rinsing process of the cooler 10 are achieved. This not only significantly improves the automation level, operational safety, and cleaning reliability of the unit, but also provides a data foundation for unit maintenance, fault diagnosis, and energy-saving optimization.

[0060] In some embodiments, the condensate is water at 45°C-50°C, and the gas is dry compressed air.

[0061] The condensate supply source 20 provides hot water at a temperature between 45°C and 50°C, which is delivered to the nozzles 2 inside the cooler 10 via the condensate line 1. The hot water source can be the plant's hot water system, circulating water heated by a steam heat exchanger, or an electrically heated storage tank. The purge line 3 connects to the plant's dry compressed air system, with a dew point typically ≤-40°C, to prevent moisture in the air from condensing or freezing at low temperatures. The dry air, controlled by the fourth valve 301, enters the main line 101 to push residual condensate out of the first drain line 4.

[0062] Warm water quickly softens and dissolves urea deposits and clumps adhering to the cooling plate 1001, improving the thoroughness of cleaning. Dry compressed air purging ensures that the inside of the pipeline is completely dry, fundamentally eliminating the risk of pipeline rupture caused by water accumulation and freezing in winter.

[0063] In some embodiments, the cooler flushing device further includes a heating element (not shown in the figures), which wraps around and covers the outer periphery of the condensate line 1, and is used to heat the condensate line 1.

[0064] The heating element can be an electric heating tape, an electric heating sleeve, or a steam heating pipe, spirally wound or straight-tube wrapped around the outer wall of the condensate line 1 to ensure full contact and heat transfer. The heating element can cover the section from the condensate supply source 20 to the inlet of the main line 101 and the entire length of the main line 101. An outer insulation layer, such as glass wool, aluminum silicate, or polyurethane foam, can be added to reduce heat loss and improve heating efficiency.

[0065] The heating element can be connected to a control device, and the temperature sensor is installed on the condensate line 1 or inside the heating layer. The control device can set a target temperature range; when the detected temperature is lower than the set value, heating automatically starts and stops when the upper limit is reached, achieving constant temperature control. By installing a heating element around the condensate line 1 and achieving full-process heating and insulation, key problems such as condensate cooling, crystallization, and freezing blockage in low-temperature environments are effectively solved.

[0066] In some embodiments, the cooler flushing device further includes a backflushing module (not shown in the figures), which is connected to a plurality of nozzles 2 for periodically backflushing the nozzles 2 to prevent particle blockage.

[0067] The backwash module may include a backwash line that can be connected to the condensate line 1, allowing condensate to flow into the nozzle 2. A backwash power source, such as a small pump or motor, is located on the backwash line; and a backwash control valve, such as a solenoid valve, pneumatic valve, or multi-way switching valve, is also located on the backwash line. The backwash power source and backwash control valve may be electrically connected to a control device capable of opening and closing them.

[0068] The backwash module is connected in reverse to the outlet ends or internal channels of multiple nozzles 2 via backwash pipelines, forming a reverse fluid channel. In normal flushing mode, condensate is sprayed out from the main pipeline 101, branch pipeline 102, and nozzles 2 in the forward direction. In backwashing mode, the control device can open the backwash control valve, allowing condensate to enter in reverse from the outlet end of nozzle 2 under the action of the backwash power source. This flushes out urea particles and crystals adhering to the inner wall of the nozzle orifice or clogging the orifice, returning them to the condensate pipeline 1, thus preventing particle blockage. The backwash module can use a combination of existing backwash pumps and control valve assemblies, or existing devices such as pulse-type backflushing devices, which will not be described in detail here.

[0069] This application enables efficient, safe, and reliable online cleaning of the urea granulator cooler 10 without requiring manual entry into the cooler 10, thereby reducing safety risks, minimizing downtime, increasing production capacity, and lowering maintenance costs.

[0070] Example 2

[0071] This application also provides a production system, including the cooler flushing device provided in Embodiment 1.

[0072] The production system may also include a urea granulator for forming molten urea into granular products. A cooler 10, connected to the discharge end of the urea granulator, is used for air-cooling the high-temperature urea granules; it is typically a vertical or horizontal cooling tower structure with multiple cooling plates 1001 inside. The cooler flushing device provided in Example 1 can be integrated into the internal and surrounding piping system of the cooler 10 for online cleaning of urea deposits and crystals on the surface of the cooling plates 1001.

[0073] The production system provided in this application integrates a cooler flushing device with online cleaning, antifreeze and anti-clogging features, and safety and reliability, forming a highly efficient, intelligent and safe urea granulation production system. This not only solves the pain points of frequent downtime, significant safety hazards, and high maintenance costs caused by material accumulation in the cooler 10 in traditional production, but also significantly improves production continuity, product quality stability, and operational economy.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooler flushing device, characterized in that, include: A condensate line, wherein the first end of the condensate line is used to connect to a condensate supply source; Multiple nozzles are disposed inside the cooler and connected to the second end of the condensate pipeline. The area covered by the multiple nozzles can cover the cooling plate inside the cooler. A purge line, the third end of which is connected to a gas supply source, and the fourth end of which is connected to the condensate line; The first drain line is vertically positioned at the bottom of the condensate line and connected to it. The first drain line is equipped with a first drain valve, allowing the gas from the gas supply source to discharge the condensate in the condensate line through the purge line.

2. The cooler flushing device according to claim 1, characterized in that, The condensate pipeline includes a main pipeline and multiple branch pipelines, with the multiple branch pipelines respectively connected to the main pipeline, and the multiple nozzles evenly distributed on the multiple branch pipelines; Each of the branch lines is provided with a first valve on the side near the connection with the main line, the first valve being used to control the connection between the branch line and the main line.

3. The cooler flushing device according to claim 2, characterized in that, The branch pipeline is inclined in the vertical direction, and the end of the branch pipeline that is away from its connection with the main pipeline is higher in the vertical direction than the end of the branch pipeline that is connected with the main pipeline. The main pipeline has a U-shaped structure along the vertical direction. The first drain line is connected to the bottom of the main pipeline, and the multiple branch lines are higher than the end of the first drain line connected to the main pipeline in the vertical direction.

4. The cooler flushing device according to claim 2, characterized in that, The main pipeline is equipped with a second valve and a third valve on the side near the condensate supply source. The second valve and the third valve are connected in series and are used to control the connection and disconnection between the condensate supply source and the main pipeline.

5. The cooler flushing device according to claim 4, characterized in that, Also includes: The second drain line is connected to the main drain line between the second valve and the third valve, and the second drain line is equipped with a second drain valve.

6. The cooler flushing device according to claim 4, characterized in that, The purging line is connected to the main line, and a fourth valve is provided on the purging line. The fourth valve is used to control the connection and disconnection between the purging line and the main line.

7. The cooler flushing device according to claim 6, characterized in that, Also includes: Pressure detection device and flow detection device are provided on both the purge line and the condensate line; A control device is connected to the pressure detection device, the flow detection device, the second valve, the third valve, and the fourth valve respectively. The control device controls the opening degree of the second valve, the third valve, and the fourth valve according to the detection signals of the pressure detection device and the flow detection device.

8. The cooler flushing device according to claim 1, characterized in that, The condensate is water at 45℃-50℃, and the gas is dry compressed air.

9. The cooler flushing device according to claim 1, characterized in that, Also includes: A heating element that wraps around and covers the outer periphery of the condensate line, the heating element being used to heat the condensate line.

10. A production system, characterized in that, Includes the cooler flushing device according to any one of claims 1 to 9.

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