Dragging mechanism utilizing urea steam backpressure

Abstract

The utility model relates to the technical field of urea steam recovery, and discloses a dragging mechanism utilizing urea steam backpressure, which comprises an exhaust pipe, one end of the exhaust pipe is connected with a flow meter through a flange, the other end of the flow meter is connected with a gas delivery pipe through a flange, the other end of the gas delivery pipe is provided with a gas valve through a flange, and the gas valve is connected with the flow meter through a flange. The outer wall of the gas conveying pipe is sleeved with a heat insulation pipe sleeve. And the high-pressure ammonium carbamate pump motor is connected to the end, away from the exhaust pipe, of the gas conveying pipe, and the exhaust end of the high-pressure ammonium carbamate pump motor is connected with an upper steam pipe. The dragging mechanism utilizing the urea steam backpressure is provided with the high-pressure ammonium carbamate pump motor and the high-pressure ammonium carbamate pump turbine, the high-pressure ammonium carbamate pump motor and the high-pressure ammonium carbamate pump turbine are used for converting potential energy and heat energy of high-pressure urea steam into electric energy to be used by a urea production line, redundant electric energy can be supplied to a power grid, and energy recovery is achieved; and the urea steam collected by the high-pressure steam pocket can meet the heat requirement of the stripping tower, so that the urea production cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of urea steam recovery, in particular to a driving mechanism utilizing the back pressure of urea steam. Background Technique

[0002] In the urea workshop, the low-pressure expansion steam used to be not effectively utilized in the past, and most of it was discharged into the trench or the air. Generally, urea steam recovery technology is adopted to reuse urea steam. The reuse of urea steam mainly includes recovering and utilizing low-pressure expansion steam and condensate, utilizing vent steam, and improving the thermal energy utilization rate through waste heat recovery technology.

[0003] The high-pressure urea steam generated in the urea production process usually enters the high-pressure steam drum after being processed. After the high-pressure steam drum reduces the pressure, it is sent to the stripping tower for heating, resulting in a large amount of energy loss during the pressure reduction process of the high-pressure urea steam, and the high-pressure urea steam cannot be reused. For this reason, we propose a driving mechanism utilizing the back pressure of urea steam. Content of the Utility Model

[0004] The purpose of the utility model is to provide a driving mechanism utilizing the back pressure of urea steam to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A driving mechanism utilizing the back pressure of urea steam, comprising:

[0006] An exhaust pipe, one end of the exhaust pipe is connected with a flow meter through a flange, the other end of the flow meter is connected with an air delivery pipe through a flange, the other end of the air delivery pipe is equipped with an air valve through a flange, and a heat insulation pipe sleeve is sleeved on the outer wall of the air delivery pipe;

[0007] A high-pressure methylamine pump motor, which is connected to the end of the air delivery pipe far away from the exhaust pipe. The exhaust end of the high-pressure methylamine pump motor is connected with an upper steam pipe, the other end of the upper steam pipe is connected with a high-pressure methylamine pump turbine through a flange, and the output end of the high-pressure methylamine pump turbine is connected with a high-pressure steam drum through the upper steam pipe.

[0008] Further, the exhaust pipe is connected in communication with the air delivery pipe through the flow meter and the air valve, and the air delivery pipe is connected in communication with the high-pressure methylamine pump motor through an air pump, and the heat insulation pipe sleeve forms an enclosed structure with the air delivery pipe.

[0009] Further, the high-pressure methylamine pump motor is connected in communication with the high-pressure methylamine pump turbine through the upper steam pipe, and the high-pressure methylamine pump turbine is connected in communication with the high-pressure steam drum through the upper steam pipe.

[0010] Furthermore, a connecting pipe fitting is installed at the connection between the gas transmission pipe and the high-pressure carbamate pump motor through bolts, and an annular sealing ring is laid at the connection between the gas transmission pipe and the high-pressure carbamate pump motor.

[0011] Furthermore, the gas transmission pipe and the high-pressure carbamate pump motor form a detachable structure through the connecting pipe fitting, and a sealed connection is formed between the gas transmission pipe and the high-pressure carbamate pump motor through the sealing ring.

[0012] Furthermore, a sealing plate is installed on one side of the high-pressure carbamate pump motor through bolts, a filter frame is fixed inside the sealing plate, and filter nets are laid on the outer walls on both sides of the filter frame.

[0013] Furthermore, the filter nets are symmetrically arranged about the central axis position of the filter frame, and the filter nets form a detachable structure with the high-pressure carbamate pump motor through the filter frame and the sealing plate, and a communication connection is formed between the gas transmission pipe and the high-pressure carbamate pump motor through the filter nets.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The driving mechanism utilizing the back pressure of urea steam is provided with a high-pressure carbamate pump motor and a high-pressure carbamate pump turbine, which are used to convert the potential energy and heat energy of high-pressure urea steam into electric energy for use in the urea production line, and the excess electric energy can also be supplied to the power grid to achieve energy recovery. Moreover, the urea steam collected by the high-pressure steam drum can meet the heat demand of the stripper, further reducing the production cost of urea. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front view structural schematic diagram of the combined working state of the present utility model;

[0017] Figure 2 is the enlarged structural schematic diagram of the gas transmission pipe and the heat insulation pipe sleeve part of the present utility model;

[0018] Figure 3 is the enlarged structural schematic diagram of the disassembled state of the connecting pipe fitting part of the present utility model;

[0019] Figure 4 is the enlarged rear view structural schematic diagram of the disassembled state of the sealing plate part of the present utility model.

[0020] In the figure: 1, exhaust pipe; 2, flowmeter; 3, gas transmission pipe; 4, gas valve; 5, high-pressure carbamate pump motor; 6, upper steam pipe; 7, high-pressure carbamate pump turbine; 8, high-pressure steam drum; 9, heat insulation pipe sleeve; 10, connecting pipe fitting; 11, sealing ring; 12, sealing plate; 13, filter frame; 14, filter net. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] The present utility model provides an improved driving mechanism utilizing the back pressure of urea steam. Please refer to Figure 1 - Figure 2 , including: an exhaust pipe 1, one end of the exhaust pipe 1 is connected with a flow meter 2 through a flange. The flow meter 2 is used to count the total amount of high-pressure urea steam passing through, facilitating regular monitoring by staff; the other end of the flow meter 2 is connected with an air delivery pipe 3 through a flange. The other end of the air delivery pipe 3 is equipped with a gas valve 4 through a flange. A communication connection is formed between the exhaust pipe 1, the flow meter 2, and the air delivery pipe 3 through the gas valve 4. And the air delivery pipe 3 is connected with a high-pressure ammonium carbamate pump motor 5 through an air pump to form a communication connection. An insulating pipe sleeve 9 is sleeved on the outer wall of the air delivery pipe 3, and an enclosed structure is formed between the insulating pipe sleeve 9 and the air delivery pipe 3. The insulating pipe sleeve 9 is used to isolate the heat of the air delivery pipe 3 to prevent personnel or equipment from being scalded by the air delivery pipe 3; the end of the air delivery pipe 3 away from the exhaust pipe 1 is connected with a high-pressure ammonium carbamate pump motor 5. The exhaust end of the high-pressure ammonium carbamate pump motor 5 is connected with an upper steam pipe 6. The other end of the upper steam pipe 6 is connected with a high-pressure ammonium carbamate pump turbine 7 through a flange. A communication connection is formed between the high-pressure ammonium carbamate pump motor 5 and the high-pressure ammonium carbamate pump turbine 7 through the upper steam pipe 6. The provided high-pressure ammonium carbamate pump motor 5 and high-pressure ammonium carbamate pump turbine 7 are used to convert the potential energy and heat energy of high-pressure urea steam into electric energy for use in the urea production line, and the excess electric energy can also be supplied to the power grid to achieve energy recovery; the output end of the high-pressure ammonium carbamate pump turbine 7 is connected with a high-pressure steam drum 8 through the upper steam pipe 6, and a communication connection is formed between the high-pressure ammonium carbamate pump turbine 7 and the high-pressure steam drum 8 through the upper steam pipe 6. The high-pressure steam drum 8 is used to collect the urea steam discharged after pressure reduction after power generation, and to meet the heat demand of the stripper through the residual heat of the urea steam, further reducing the production cost of urea.

[0023] Please refer to Figure 1 and Figure 3, A driving mechanism utilizing the back pressure of urea vapor, comprising: A connecting pipe fitting 10 is installed by bolts at the connection between the gas transmission pipe 3 and the high-pressure carbamate pump motor 5. The gas transmission pipe 3 and the high-pressure carbamate pump motor 5 form a detachable structure through the connecting pipe fitting 10. The provided connecting pipe fitting 10 is used to enhance the airtightness at the connection between the gas transmission pipe 3 and the high-pressure carbamate pump motor 5, prevent the leakage of the input urea vapor, and the detachable structure facilitates the maintenance and repair by the staff; A ring-shaped sealing gasket 11 is laid at the connection between the gas transmission pipe 3 and the high-pressure carbamate pump motor 5, and the gas transmission pipe 3 and the high-pressure carbamate pump motor 5 are hermetically connected through the sealing gasket 11. The sealing gasket 11 is used to enhance the sealing performance at the connection between the gas transmission pipe 3 inside the connecting pipe fitting 10 and the input end of the high-pressure carbamate pump motor 5.

[0024] Please refer to Figure 1 and Figure 4 , A driving mechanism utilizing the back pressure of urea vapor, comprising: A sealing plate 12 is installed by bolts on one side of the high-pressure carbamate pump motor 5. The sealing plate 12 facilitates the removal of the filter screen 14 from the high-pressure carbamate pump motor 5 for cleaning and maintenance; A filter frame 13 is fixed inside the sealing plate 12. Filter screens 14 are laid on the outer walls on both sides of the filter frame 13. The filter screens 14 are symmetrically arranged about the central axis position of the filter frame 13, and the filter screens 14 and the high-pressure carbamate pump motor 5 form a detachable structure through the filter frame 13 and the sealing plate 12. Moreover, the gas transmission pipe 3 and the high-pressure carbamate pump motor 5 are connected in communication through the filter screens 14. The provided filter screens 14 are installed at the position of the high-pressure carbamate pump motor 5 near the input end through the sealing plate 12, facilitating the filtration of the input high-pressure urea vapor and preventing impurities in the vapor from damaging the high-pressure carbamate pump motor 5.

[0025] Working principle: For this kind of driving mechanism using the back pressure of urea steam, first, the high-pressure urea steam generated during the urea production process enters the gas pipeline 3 through the exhaust pipe 1. The total amount of the input high-pressure urea steam can be monitored through the flow meter 2, which is convenient for the staff to stop the machine for maintenance according to the operation situation and prevent the mechanism from crashing due to overwork. Then, the gas pipeline 3 is covered and protected by the heat insulation sleeve 9 to prevent passing personnel or equipment from being scalded by the gas pipeline 3 transporting high-pressure and high-temperature steam. Subsequently, the high-pressure urea steam in the gas pipeline 3 enters the high-pressure carbamate pump motor 5 through the opened air valve 4. The high-pressure urea steam is filtered through the filter screen 14 on the filter frame 13 inside the sealing plate 12 and drives the high-pressure carbamate pump motor 5 to generate electricity. While the generated electric energy drives the operation of the urea production line, the excess electric energy can also be incorporated into the power grid for storage to realize the effective utilization of this part of high-pressure steam. After that, the residual steam discharged from the high-pressure carbamate pump motor 5 enters the high-pressure carbamate pump turbine 7 through the upper steam pipe 6 to complete decompression. Finally, the decompressed high-pressure urea steam enters the high-pressure steam drum 8 for the stripping tower to use and recover the steam heat therein. After the mechanism operates for a period of time, since the gas pipeline 3 is connected to the high-pressure carbamate pump motor 5 through the sealing ring 11 and the connecting pipe fitting 10, the connection method has good airtightness and is convenient for disassembly and maintenance.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A driving mechanism utilizing the back pressure of urea vapor, characterized in that, Including: An exhaust pipe (1), one end of the exhaust pipe (1) is connected with a flowmeter (2) through a flange, the other end of the flowmeter (2) is connected with an air delivery pipe (3) through a flange, the other end of the air delivery pipe (3) is equipped with an air valve (4) through a flange, and a heat insulation pipe sleeve (9) is sleeved on the outer wall of the air delivery pipe (3); A high-pressure carbamate pump motor (5), which is connected to the end of the air delivery pipe (3) far from the exhaust pipe (1), the exhaust end of the high-pressure carbamate pump motor (5) is connected with an upper air pipe (6), the other end of the upper air pipe (6) is connected with a high-pressure carbamate pump turbine (7) through a flange, and the output end of the high-pressure carbamate pump turbine (7) is connected with a high-pressure steam drum (8) through the upper air pipe (6).

2. The drag mechanism using the back pressure of urea vapor according to claim 1, wherein: The exhaust pipe (1) is connected in communication with the air delivery pipe (3) through the flowmeter (2) and the air valve (4), and the air delivery pipe (3) is connected in communication with the high-pressure carbamate pump motor (5) through an air pump, and the heat insulation pipe sleeve (9) forms an enclosed structure with the air delivery pipe (3).

3. A driving mechanism using the back pressure of urea vapor according to claim 1, characterized in that: The high-pressure carbamate pump motor (5) is connected in communication with the high-pressure carbamate pump turbine (7) through the upper air pipe (6), and the high-pressure carbamate pump turbine (7) is connected in communication with the high-pressure steam drum (8) through the upper air pipe (6).

4. A driving mechanism using urea vapor back pressure according to claim 1, characterized in that: A connecting pipe fitting (10) is installed through bolts at the connection between the air delivery pipe (3) and the high-pressure carbamate pump motor (5), and an annular sealing ring (11) is laid at the connection between the air delivery pipe (3) and the high-pressure carbamate pump motor (5).

5. A driving mechanism using the back pressure of urea vapor according to claim 4, characterized in that: The air delivery pipe (3) and the high-pressure carbamate pump motor (5) form a detachable structure through the connecting pipe fitting (10), and the air delivery pipe (3) is hermetically connected with the high-pressure carbamate pump motor (5) through the sealing ring (11).

6. The drag mechanism using the back pressure of urea vapor according to claim 1, wherein: A sealing plate (12) is installed through bolts on one side of the high-pressure carbamate pump motor (5), a filter frame (13) is fixed inside the sealing plate (12), and filter meshes (14) are laid on the outer walls on both sides of the filter frame (13).

7. A driving mechanism using the back pressure of urea vapor according to claim 6, characterized in that: The filter meshes (14) are symmetrically arranged about the central axis position of the filter frame (13), and the filter meshes (14) form a detachable structure with the high-pressure carbamate pump motor (5) through the filter frame (13) and the sealing plate (12), and the air delivery pipe (3) is connected in communication with the high-pressure carbamate pump motor (5) through the filter meshes (14).

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