A waste heat recovery assembly based on a synthetic ammonia process

Abstract

The utility model discloses a kind of waste heat recovery assemblies based on synthetic ammonia process, including cylinder, the cylinder is horizontally installed on base, the gas pipe of cylinder left side setting is successively connected steam superheater, waste heat boiler and boiler water heater, cylinder right side horizontally arranged steam exhaust pipe is connected the boiler water heater;Steam exhaust pipe is connected with the filter assembly of cylinder right side;The first gas pipe and second gas pipe are respectively communicated and arranged in the both ends of the cylinder;Grid plate is rotatably arranged in the cylinder, and cleaning assembly is installed on the cylinder.This device can efficiently recycle the waste heat in synthetic ammonia tail gas, and the built-in cleaning assembly can periodically and effectively clean the grid plate that guides flow uniform gas, ensure gas conduction effect;In addition, the filter element at the steam exhaust pipe of this device is very convenient to replace, significantly improves the maintenance efficiency of this device.

Description

Technical Field

[0001] This utility model belongs to the field of ammonia synthesis equipment, specifically relating to a waste heat recovery component based on the ammonia synthesis process. Background Technology

[0002] Ammonia is a major raw material in the fertilizer industry and basic organic chemical industry. Ammonia synthesis is generally carried out by synthesizing nitrogen and hydrogen under high temperature, high pressure, and in the presence of a catalyst. The synthesis process generates heat-containing gases, and to improve energy utilization efficiency, waste heat recovery systems are typically used to reuse the heat in these gases.

[0003] A utility model patent with authorization announcement number CN218154184U discloses a waste heat recovery component. This device can reuse the heat in the ammonia synthesis tail gas by setting up a waste heat boiler, a steam superheater, and a boiler water heater. However, the grid plate used to evenly distribute and disperse the gas in the heating shell of this device is fixed. After long-term operation, a large amount of dust and other debris will accumulate at the through holes above it, which will seriously affect the gas conduction efficiency of the grid plate. In addition, the flue gas discharged from the steam pipe connected to the boiler water heater contains particulate impurities. Although the device has a filter screen structure in the filter cartridge, the filter screen needs to be replaced and maintained regularly. The replacement of the filter screen structure is very inconvenient and will seriously affect the maintenance efficiency of the filter screen. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model aims to provide a waste heat recovery component based on the ammonia synthesis process. This device can efficiently recover and utilize the waste heat in the ammonia synthesis tail gas, and the built-in cleaning component can regularly and effectively clean the grid plate that guides the uniformly distributed gas flow, ensuring gas flow. In addition, the filter element at the steam exhaust pipe of this device is very convenient to replace, significantly improving the maintenance efficiency of this device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A waste heat recovery assembly based on ammonia synthesis process includes a cylindrical body, a waste heat boiler, a steam superheater, and a boiler water heater. The cylindrical body is horizontally mounted on a base. The steam superheater and boiler water heater are installed inside the cylindrical body, while the waste heat boiler is installed outside the cylindrical body. A gas inlet pipe on the left side of the cylindrical body connects the steam superheater, waste heat boiler, and boiler water heater in series. A horizontally arranged steam exhaust pipe on the right side of the cylindrical body connects to the boiler water heater. The steam exhaust pipe is connected to a filter assembly on the right side of the cylindrical body. A first gas pipe and a second gas pipe are respectively connected to the left and right ends of the cylindrical body. The cylinder has a first gas pipe connected to the reaction tower and a second gas pipe through which gas enters the tower. Inside the cylinder, near the exhaust pipe, there is a circular grid plate coaxially mounted. The grid plate is rotatably mounted on the inner wall of the cylinder. Multiple air holes are horizontally opened through the grid plate. A cleaning assembly for cleaning the grid plate is installed on the cylinder. The cleaning assembly includes a rotary drive assembly and a cleaning brush. The rotary drive assembly is used to drive the grid plate to rotate. The cleaning brush is located inside the cylinder on the right side of the grid plate. A material leakage port is opened on the cylinder below the cleaning brush and is connected to the collection box at the bottom of the cylinder.

[0007] Preferably, a sealed bearing is coaxially mounted on the inner wall of the cylinder, and the grating plate is rotatably connected to the inner wall of the cylinder through the sealed bearing.

[0008] Preferably, the rotary drive assembly includes a gear ring, a gear, and a motor. The gear ring is concentrically fixed on the left side of the grid plate, the motor is mounted on the cylinder, and the output shaft of the motor is coaxially fixed to the gear, which meshes with the gear ring.

[0009] Preferably, the cleaning brush is a strip-shaped brush plate.

[0010] Preferably, the cleaning brush is obliquely fixed above the material outlet along the radial direction of the grid plate.

[0011] Preferably, the material collection box has a discharge port on its side wall, and a receiving drawer is movably provided at the discharge port.

[0012] Preferably, the outer side panel of the receiving drawer is fixed to the discharge port by bolts.

[0013] Preferably, the filter assembly includes an exhaust vertical cylinder, a frame, and multiple layers of filter screens. An inspection port is provided on the side wall of the exhaust vertical cylinder, and a side plate is detachably provided at the inspection port. The frame is detachably installed in the middle of the exhaust vertical cylinder, close to the inner wall of the exhaust vertical cylinder, and the filter screens are installed on the frame in layers from top to bottom.

[0014] Preferably, two symmetrical slots are vertically and upwardly extending through both sides of the inspection port, and the two sides of the side plate are vertically engaged in the corresponding slots.

[0015] Preferably, a slot is provided on the inner wall of the exhaust vertical cylinder away from the inspection port, and the rear side of the frame is placed in the slot and fixed to the inner wall of the slot by bolts.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This application utilizes side plates that are inserted from top to bottom into the slots on both sides of the inspection port opening, thereby enabling quick installation and removal of the side plates, making the maintenance and replacement of the filter screen more convenient and efficient.

[0018] 2. The frame of this application is internally adapted to and tightly fitted with the exhaust vertical cylinder, which can effectively reduce the flow of gas through the gap between the frame and the exhaust vertical cylinder. In addition, in order to improve the ease of installation of the frame, this application has a locking groove on the inner wall of the exhaust vertical cylinder relative to the inspection port. The rear side of the frame relative to the inspection port is locked in the locking groove, which can effectively support the frame and improve the ease of installation. Then, the frame is fixed to the side wall of the locking groove using a bolt structure, thereby stabilizing the frame.

[0019] 3. The frame of this application is a hollow structure, with the filter screens installed in layers and stacked horizontally in the frame. As the flue gas from the steam exhaust pipe is discharged from bottom to top, the multi-layer filter screens can effectively filter particulate impurities in the flue gas, significantly reducing the impurity content of the flue gas emitted into the air.

[0020] 4. In this application, the circular grid plate is vertically rotated. The motor drives the gear to rotate, which in turn drives the grid plate to rotate through the toothed ring on the left. When the grid plate rotates, the cleaning brush on the right can effectively clean the attached impurities on the grid plate, thereby effectively cleaning the grid plate.

[0021] 5. The impurities scraped off by the cleaning brush in this application will flow downwards through the discharge port into the collection box, and then fall into the receiving drawer in the collection box. When cleaning up waste, simply pull the receiving drawer outward to achieve quick waste removal. The receiving drawer is fixed to the discharge port by bolts on its outer side plate, which can improve the installation stability of the receiving drawer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the left side of the grating plate of this utility model;

[0024] Figure 3 This is a schematic diagram of the right-side installation of the grating plate of this utility model;

[0025] Figure 4 This is a front sectional view of the exhaust vertical cylinder of this utility model;

[0026] Figure 5 This is a schematic diagram of the exhaust vertical cylinder of this utility model. Detailed Implementation

[0027] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of application of this utility model.

[0028] like Figure 1-5 As shown, this utility model proposes a waste heat recovery component based on ammonia synthesis process, including a cylindrical body 1, a waste heat boiler 22, a steam superheater 21, and a boiler water heater 23. The cylindrical body 1 is horizontally mounted on a base 15. The steam superheater 21 and the boiler water heater 23 are installed inside the cylindrical body 1, and the waste heat boiler 22 is installed outside the cylindrical body 1. A gas inlet pipe 11 is provided on the left side of the cylindrical body 1, which connects the steam superheater 21, the waste heat boiler 22, and the boiler water heater 23 in series. A steam exhaust pipe 13 is horizontally provided on the right side of the cylindrical body 1, which connects to the boiler water heater 23. A first gas pipe 12 and a second gas pipe 14 are respectively connected to the left and right ends of the cylindrical body 1. The first gas pipe 12 is connected to the reaction tower, and the gas entering the tower is introduced into the second gas pipe 14.

[0029] The tail gas from ammonia synthesis enters the steam superheater 21 through the gas inlet pipe 11, and the superheated steam produced as a byproduct is sent to the waste heat boiler 22 and then to the boiler water heater 23. The temperature of the boiler water heater 23 is used to heat the gas entering the tower through the second gas pipe 14. The steam from the boiler water heater 23 is discharged from the steam outlet pipe 13. The heated gas entering the tower is dispersed and guided by the grid plate 3 and then sent to the reaction tower through the first gas pipe 12. The above principle is existing technology and will not be described in detail here.

[0030] In this application, the steam exhaust pipe 13 is connected to the filter assembly on the right side of the cylinder 1. The filter assembly includes an exhaust vertical cylinder 5, a frame 61, and a multi-layer filter screen 62. The exhaust vertical cylinder 5 is fixed to the cylinder. A maintenance port 52 is vertically extended through the right side wall of the exhaust vertical cylinder 5, and a side plate 54 is detachably installed at the maintenance port 52. Specifically, two symmetrical slots 53 are vertically extended through the opening on both sides of the maintenance port 52, and the two sides of the side plate 54 are vertically engaged in the corresponding slots 53.

[0031] This application utilizes a side plate 54 that is inserted from top to bottom into the slots 53 on both sides of the opening of the inspection port 52, thereby enabling the quick installation and removal of the side plate 54, making the maintenance and replacement of the filter screen 62 more convenient and efficient.

[0032] The frame 61 is detachably installed in the middle of the exhaust vertical cylinder 5, closely attached to the inner wall of the exhaust vertical cylinder 5. The filter screen 62 is installed on the frame 61 in layers from top to bottom. In a specific implementation, a slot 51 is provided on the inner wall of the exhaust vertical cylinder 5 away from the inspection port 52. The rear side of the frame 61 is inserted into the slot 51 and fixed to the inner wall of the slot 51 by the second bolt 611.

[0033] The frame 61 of this application fits tightly and conforms to the interior of the exhaust vertical cylinder 5, effectively reducing gas flow through the gap between the frame 61 and the exhaust vertical cylinder 5. Furthermore, to improve the ease of installation of the frame 61, a slot 51 is provided on the inner wall of the exhaust vertical cylinder 5 relative to the inspection port 52. The rear side of the frame 61 relative to the inspection port 52 is secured in the slot 51, providing effective support and improving installation convenience. The frame 61 is then fixed to the side wall of the slot 51 using a second bolt 611, thus ensuring stable fixation of the frame 61. The frame 61 of this application has a hollow structure, with the filter screen 62 installed in layers and stacked horizontally within the frame 61. As the flue gas from the steam exhaust pipe 13 is discharged upwards, the multiple layers of filter screen 62 effectively filter particulate impurities in the flue gas, significantly reducing the impurity content of the flue gas emitted into the air.

[0034] A circular grid plate 3 is coaxially mounted inside the cylinder 1 near the exhaust pipe. Multiple horizontally penetrating vent holes 30 are provided on the grid plate 3. The grid plate 3 increases the emission path of the gas entering the tower, employing a multi-hole, dispersed emission method to control the emission rate of the gas entering the tower. In this application, the grid plate 3 is rotatably mounted on the inner wall of the cylinder 1. A cleaning assembly for cleaning the grid plate 3 is installed on the cylinder 1. The cleaning assembly includes a rotary drive assembly and a cleaning brush 41. The rotary drive assembly drives the grid plate 3 to rotate, and the cleaning brush 41 is located inside the cylinder 1 on the right side of the grid plate 3. Specifically, the cleaning brush 41 is a strip-shaped brush. The cleaning brush 41 is inclined and fixed above the discharge port 10 along the radial direction of the grid plate 3. A sealed bearing 16 is coaxially mounted on the inner wall of the cylinder 1, and the grid plate 3 is rotatably connected to the inner wall of the cylinder 1 through the sealed bearing 16. The rotary drive assembly includes a gear ring 31, a gear 32, and a motor 33. The gear ring 31 is concentrically fixed on the left side of the grid plate 3. The motor 33 is mounted on the cylinder 1. The output shaft of the motor 33 is coaxially fixed to the gear 32, and the gear 32 meshes with the gear ring 31.

[0035] The gas entering the cylinder 1 through the second gas pipe 14 flows from right to left. The dust and impurities in the gas mainly accumulate on the right side of the grid plate 3. In this application, the circular grid plate 3 is vertically rotated. The motor 33 drives the gear 32 to rotate, which in turn drives the grid plate 3 to rotate through the toothed ring 31 on the left side. When the grid plate 3 rotates, the cleaning brush 41 on the right side can effectively clean the impurities attached to the grid plate 3, thereby effectively cleaning the grid plate 3.

[0036] A material discharge port 10 is provided on the cylinder 1 below the cleaning brush 41, and the material discharge port 10 is connected to the material collection box 42 at the bottom of the cylinder 1. A material outlet is provided on the side wall of the material collection box 42, and a material receiving drawer 43 is movably provided at the material outlet. The outer side plate of the material receiving drawer 43 is fixed to the material outlet by the first bolt 431.

[0037] Impurities scraped off by the cleaning brush 41 will flow downwards through the discharge port 10 into the collection box 42, and then fall into the receiving drawer 43 in the collection box 42. When cleaning up waste, simply pull the receiving drawer 43 outwards to achieve quick waste removal. The receiving drawer 43 is fixed to the discharge port by bolts on its outer side plate, which can improve the installation stability of the receiving drawer 43.

[0038] When this application is used, the tail gas of ammonia synthesis enters the steam superheater 21, the waste heat boiler 22 and the boiler water heater 23 in sequence through the gas inlet pipe 11; the gas entering the tower is sent into the cylinder 1 through the second gas pipe 14 for heating and then sent into the reaction tower through the first gas pipe 12; when cleaning the grid plate 3, the motor 33 is rotated to drive the grid plate 3 to rotate, and the cleaning brush 41 on the right side can effectively clean the attached impurities on the grid plate 3.

[0039] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A waste heat recovery assembly based on ammonia synthesis process, comprising a cylinder, a waste heat boiler, a steam superheater, and a boiler water heater, characterized in that: The cylindrical body is horizontally mounted on the base. The steam superheater and boiler water heater are installed inside the cylindrical body, and the waste heat boiler is installed outside the cylindrical body. A gas inlet pipe on the left side of the cylindrical body connects the steam superheater, waste heat boiler, and boiler water heater in series. A steam exhaust pipe on the right side of the cylindrical body connects to the boiler water heater. The steam exhaust pipe is connected to the filter assembly on the right side of the cylindrical body. A first gas pipe and a second gas pipe are respectively connected to the left and right ends of the cylindrical body. The first gas pipe is connected to the reaction tower, and the second gas pipe carries the gas entering the tower. A circular grid plate is coaxially mounted inside the cylindrical body near the exhaust pipe. The grid plate is rotatably mounted on the inner wall of the cylindrical body. Multiple air holes are horizontally opened through the grid plate. A cleaning assembly for cleaning the grid plate is installed on the cylindrical body. The cleaning assembly includes a rotary drive assembly and a cleaning brush. The rotary drive assembly is used to drive the grid plate to rotate. The cleaning brush is located inside the cylindrical body on the right side of the grid plate. A material outlet is opened on the cylindrical body below the cleaning brush, and the material outlet is connected to the collection box at the bottom of the cylindrical body.

2. The waste heat recovery component based on the ammonia synthesis process according to claim 1, characterized in that: A sealed bearing is coaxially mounted on the inner wall of the cylinder, and the grating plate is rotatably connected to the inner wall of the cylinder through the sealed bearing.

3. The waste heat recovery component based on the ammonia synthesis process according to claim 2, characterized in that: The rotary drive assembly includes a gear ring, a gear, and a motor. The gear ring is concentrically fixed on the left side of the grid plate, the motor is mounted on the cylinder, and the output shaft of the motor is coaxially fixed to the gear, which meshes with the gear ring.

4. The waste heat recovery component based on the ammonia synthesis process according to claim 1, characterized in that: The cleaning brush is a strip-shaped brush plate.

5. The waste heat recovery component based on the ammonia synthesis process according to claim 4, characterized in that: The cleaning brush is inclined and fixed above the material outlet along the radial direction of the grid plate.

6. The waste heat recovery component based on the ammonia synthesis process according to claim 1, characterized in that: The material collection box has a discharge port on its side wall, and a receiving drawer is movably installed at the discharge port.

7. The waste heat recovery component based on the ammonia synthesis process according to claim 6, characterized in that: The outer side panel of the receiving drawer is fixed to the discharge port by bolts.

8. The waste heat recovery component based on the ammonia synthesis process according to claim 1, characterized in that: The filter assembly includes an exhaust vertical cylinder, a frame, and multiple layers of filter screens. An inspection port is provided on the side wall of the exhaust vertical cylinder, and a side plate is detachably installed at the inspection port. The frame is detachably installed in the middle of the exhaust vertical cylinder, close to the inner wall of the exhaust vertical cylinder, and the filter screens are installed on the frame in layers from top to bottom.

9. The waste heat recovery component based on the ammonia synthesis process according to claim 8, characterized in that: The inspection port has two symmetrical slots that extend vertically upwards on both sides, and the two sides of the side plate are vertically engaged in the corresponding slots.

10. The waste heat recovery component based on the ammonia synthesis process according to claim 8, characterized in that: The exhaust vertical cylinder has a slot on its inner wall away from the inspection port. The rear side of the frame is inserted into the slot and fixed to the inner wall of the slot with bolts.

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