Smoke temperature adjusting system applied to yellow phosphorus tail gas boiler

Abstract

The invention relates to the technical field of industrial boilers, in particular to a smoke temperature adjusting system applied to a yellow phosphorus tail gas boiler, which comprises a smoke pipeline, an economizer, a heat preservation box, a cleaning liquid storage tank, a support pipe and an external flushing mechanism, the heat preservation box is communicated with the side wall of the smoke outlet area of the smoke pipeline. The auxiliary temperature control mechanism is used for controlling the outer wall of the cleaning liquid storage tank to make contact with flue gas carrying redundant heat in the flue gas pipeline, so that the cleaning liquid in the cleaning liquid storage tank is heated and subjected to heat preservation, it can be guaranteed that the flue gas emission temperature is normal, heat loss is reduced, the temperature of the cleaning liquid can be kept within the application range, and the cleaning effect is improved. The cleaning efficiency of the interior of the economizer pipeline can be improved conveniently, cleaning liquid in the cleaning pipeline can be used for flushing the exterior of the economizer coiled pipe through the outer flushing mechanism, manual disassembly and cleaning are not needed, and the cleaning efficiency and quality are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial boilers, and in particular to a smoke temperature regulating system applied to a yellow phosphorus tail gas boiler. Background Art

[0002] Yellow phosphorus enterprises are high-energy-consuming enterprises. During the production of yellow phosphorus, yellow phosphorus tail gas is produced as a by-product. Due to the specificity of the production process, the tail gas contains a large amount of corrosive elements such as phosphorus, sulfur, and fluorine, as well as a large amount of water and particulate matter. The flue gas after combustion has the characteristics of many impurities, high dew point, and extremely strong corrosiveness. Due to production costs and policy reasons, the production load of yellow phosphorus electric furnaces fluctuates greatly, so that when the load is low, the boiler exhaust temperature is extremely low, and a large amount of acid condenses, causing corrosion to the boiler and its tail equipment, greatly affecting the service life of the entire set of equipment.

[0003] At present, the existing flue gas damper adjustment system, when in use, the baffle and its bearings will be blocked by impurities and particles, causing excessive resistance and inability to move, or excessive current will cause frequent damage to the actuator and lose its function; and air leakage at the connection between the bearing and the wall panel will cause the local temperature to be too low and cause acid condensation, which will then corrode the baffle itself and the boiler equipment, and completely fail after a period of time. Therefore, the non-baffle type has a longer service life than the traditional baffle type, but the non-baffle type requires setting flue gas temperature and flue gas pressure monitoring points on both sides of the economizer. There is a certain feedback delay between the two points, and the exhaust gas temperature may be slightly higher than the set range, resulting in a small amount of heat waste. In addition, the existing non-baffle type flue gas temperature adjustment system needs to be adjusted according to the flue gas. If the flue gas temperature is too low, it will easily cause crystallization in the economizer pipe, which is more troublesome to clean. Summary of the invention

[0004] In order to solve the problems of a small amount of heat waste in flue gas and troublesome cleaning of economizer, the present invention provides a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler.

[0005] The present invention provides a flue gas temperature regulating system for a yellow phosphorus tail gas boiler, which adopts the following technical solution: A flue gas temperature regulating system for a yellow phosphorus tail gas boiler, comprising: A flue gas duct, the inner wall of which is fixedly connected with at least two heat-insulating baffles; An economizer is arranged between the two heat-insulating baffles, a connection cover is fixedly connected between the heat-insulating baffle and the economizer, and a water discharge assembly of the economizer is arranged outside the flue gas duct; A heat preservation box, which is connected to the side wall of the smoke outlet area of ​​the smoke duct; A cleaning liquid storage tank, which is integrally arranged on the inner side of the heat preservation box, and an auxiliary temperature control mechanism is arranged on the side of the cleaning liquid storage tank close to the flue gas duct, and the auxiliary temperature control mechanism controls the communication between the outer wall of the cleaning liquid storage tank and the flue gas duct; A support pipe, which is arranged in the connection cover near the air inlet of the flue gas duct, and a plurality of support pipes are arranged in parallel; The external flushing mechanism is mounted on the support pipe and is connected to the water discharge assembly of the economizer.

[0006] By adopting the above technical scheme, the auxiliary temperature control mechanism is used to control the outer wall of the cleaning liquid storage tank to contact the flue gas carrying excess heat in the flue gas duct, thereby heating and insulating the cleaning liquid inside the cleaning liquid storage tank. This can not only ensure the normal flue gas emission temperature and reduce heat loss, but also maintain the cleaning liquid temperature in the applicable range, thereby facilitating improving the cleaning efficiency inside the economizer pipeline. The cleaning liquid inside the cleaning pipeline can be used through the external flushing mechanism to flush the outside of the economizer serpentine tube without manual disassembly and cleaning, thereby greatly improving the cleaning efficiency and quality.

[0007] Optionally, the water discharge assembly includes an inlet header and an outlet header, and a delivery pipe is fixedly connected between the inlet header and the outlet header and the economizer, and the delivery pipe is provided with a plurality of extension pipes and auxiliary connecting pipes for installing valves.

[0008] By adopting the above technical solution, the working medium is redistributed to its delivery pipes, extension pipes and auxiliary pipes by using the inlet header and the outlet header, so that the tube bundle of the economizer can continuously absorb heat energy.

[0009] Optionally, the auxiliary temperature control mechanism includes a motor, a crank-connecting rod, an inner sliding door and a storage plate, the storage plate is fixedly connected in the insulation box, the motor is fixedly connected to the outer wall of the cleaning liquid storage tank, the output shaft thereof is fixedly connected to the crank-connecting rod, the linkage end of the crank-connecting rod is movably connected to the inner sliding door, the inner sliding door is slidably connected to the storage plate, a limit rod parallel to the storage plate is provided between the storage plate and the outer wall of the cleaning liquid storage tank, the inner sliding door is slidably connected to the limit rod, and a temperature sensor is provided inside the cleaning liquid storage tank.

[0010] By adopting the above technical solution, a motor is used to control the opening and closing of the sliding door, thereby controlling whether the smoke contacts the outer wall of the cleaning liquid storage tank. The temperature of the cleaning liquid can be detected by a temperature sensor to keep the temperature within an applicable temperature range.

[0011] Optionally, a liquid outlet pipe communicating with the cleaning liquid storage tank is fixedly connected to the outer wall of the thermal insulation box, and the liquid outlet pipe is connected to the delivery pipe through a pipeline.

[0012] By adopting the above technical solution, the cleaning liquid is transported into the delivery pipe by using the liquid outlet pipe, so as to clean the inner wall of the economizer pipe and remove crystals.

[0013] Optionally, the external flushing mechanism includes a connecting head, a horizontal transport pipe and a vertical pipe. The connecting head is connected to the transport pipe through a pipeline. There are multiple horizontal transport pipes and they are arranged in parallel at the top of the support pipe. There are multiple vertical pipes and they are fixedly connected to the horizontal transport pipe. Each of the horizontal transport pipes is connected to the connecting head. The outer wall of the vertical pipe is fixedly connected to a high-pressure nozzle.

[0014] By adopting the above technical solution, the cleaning liquid is transported by means of the horizontal transport pipe and the vertical pipe, and the high-pressure nozzle sprays the cleaning liquid onto the outer wall of the serpentine pipe of the coal generator for cleaning.

[0015] Optionally, a smoke temperature sensor and a pressure sensor are fixedly connected to the inner walls of the two thermal insulation partitions.

[0016] By adopting the above technical solution, the smoke temperature sensor and pressure sensor are used to detect the temperature change of the smoke in and out in real time, thereby effectively reducing the heat loss.

[0017] Optionally, a filter is detachably connected to the heat-insulating baffle at the smoke inlet.

[0018] By adopting the above technical solution, the dust that may be contained in the flue gas is isolated by the filter, thereby reducing the probability of dust adhering to the outer wall of the economizer.

[0019] Optionally, the inner sliding door and the storage plate are provided with thermal insulation cotton on one side surface close to the smoke duct.

[0020] By adopting the above technical solution, thermal insulation cotton is used for heat insulation, thereby reducing the heat exchange between the flue gas and the heat preservation box.

[0021] Optionally, a solenoid valve is detachably connected to the pipe between the connector and the delivery pipe.

[0022] By adopting the above technical solution, the solenoid valve is used to control the input of liquid.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects: (1) The auxiliary temperature control mechanism is used to control the outer wall of the cleaning liquid storage tank to contact the flue gas carrying excess heat in the flue gas duct, so as to heat and insulate the cleaning liquid inside the cleaning liquid storage tank. This can not only ensure the normal flue gas emission temperature and reduce heat loss, but also keep the cleaning liquid temperature in the applicable range, which is convenient for improving the cleaning efficiency of the economizer pipeline. The cleaning liquid inside the cleaning pipeline can be used through the external flushing mechanism to flush the outside of the economizer serpentine tube, without manual disassembly and cleaning, which greatly improves the cleaning efficiency and quality; (2) The heat preservation box can be used to keep the cleaning liquid in the cleaning liquid storage tank warm, so that it can be kept in a suitable applicable temperature range before use, thereby further improving the cleaning efficiency and meeting people's use needs; (3) Compared with the traditional baffle-type flue gas temperature control system, the present invention adopts the distribution of different water supply flow rates, which ensures that the yellow phosphorus tail gas boiler is always in a good operating state without the need for complex devices and consumption of additional energy, and can effectively solve the corrosion problem and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the external three-dimensional structure of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0025] Figure 2 It is a top view structural schematic diagram of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0026] Figure 3 This is a schematic diagram of the internal cross-sectional structure of a flue gas duct of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0027] Figure 4 It is a partial cross-sectional structural schematic diagram of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0028] Figure 5 It is a partial structural schematic diagram of an auxiliary temperature control mechanism of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0029] Figure 6 It is a partial three-dimensional structural schematic diagram of an external flushing mechanism of a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler in this embodiment.

[0030] Description of reference numerals: 1. Flue gas duct; 11. Insulation baffle; 12. Filter; 2. Economizer; 21. Connection cover; 211. Smoke temperature sensor; 212. Pressure sensor; 22. Inlet header; 23. Outlet header; 24. Delivery pipe; 25. Extension pipe; 26. Auxiliary connecting pipe; 3. Insulation box; 31. Liquid outlet pipe; 4. Cleaning liquid storage tank; 41. Motor; 42. Crank connecting rod; 43. Limit rod; 44. Inner sliding door; 45. Storage board; 46. Temperature sensor; 5. Support pipe; 6. External flushing mechanism; 61. Connector; 62. Horizontal transport pipe; 63. Solenoid valve; 64. Vertical pipe; 65. High-pressure nozzle. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 - Figure 6 The present invention is described in further detail.

[0032] The embodiment of the invention discloses a smoke temperature regulating system applied to a yellow phosphorus tail gas boiler.

[0033] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] Reference Figure 1 - Figure 6 , a flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler, comprising: The inner wall of the flue gas duct 1 is fixedly connected with at least two heat-insulating baffles 11, so that the flue gas duct 1 is divided into sections, which is convenient for single section maintenance and replacement; The economizer 2 is arranged between two heat-insulating baffles 11. A connection cover 21 is fixedly connected between the heat-insulating baffles 11 and the economizer 2. The connection cover 21 is made of heat-insulating material to reduce heat loss. A water flow assembly of the economizer 2 is arranged outside the flue gas duct 1. The water flow assembly includes an inlet header 22 and an outlet header 23. A delivery pipe 24 is fixedly connected between the inlet header 22 and the outlet header 23 and the economizer 2. A plurality of extension pipes 25 and auxiliary pipes 26 for installing valves are arranged on the delivery pipe 24, so as to facilitate temperature control by controlling the water flow between different tube bundles of the economizer. The heat preservation box 3 is connected to the side wall of the smoke outlet area of ​​the smoke duct 1 to facilitate the use of the residual heat of the exhausted smoke and reduce the heat loss; The cleaning liquid storage tank 4 is integrally arranged on the inner side of the heat preservation box 3. An auxiliary temperature control mechanism is arranged on the side of the cleaning liquid storage tank 4 close to the flue gas duct 1. The auxiliary temperature control mechanism controls the connection between the outer wall of the cleaning liquid storage tank 4 and the flue gas duct 1, controls whether the flue gas performs heat exchange, and opens the auxiliary temperature control mechanism when the flue gas temperature is higher than the cleaning liquid temperature; A support pipe 5 is arranged in a connection cover 21 near the air inlet of the flue gas duct 1. A plurality of support pipes 5 are arranged in parallel to support the external flushing mechanism 6. The external flushing mechanism 6 is mounted on the supporting pipe 5 and is connected to the water discharge assembly of the economizer 2 .

[0035] Specifically, when temperature control is performed, the flue gas after combustion from the yellow phosphorus tail gas boiler enters the economizer 2 from the upper connecting hood 21, and is sent out after the flue gas temperature is reduced (the water temperature in the serpentine tube of the economizer 2 rises) after heat exchange in the economizer 2. The water flow rate is adjusted according to the flue gas temperature and flue gas pressure data. When adjustment is needed, the water flow rate of each serpentine tube bundle in the economizer 2 is allocated, and the flue gas temperature and feed water temperature are adjusted by changing the feed water flow rate. Taking the high-temperature and high-pressure yellow phosphorus tail gas boiler as an example, a traditional baffle-type flue gas temperature regulation system is used. In 1-2 months, the pipeline will be blocked and corroded and must be shut down for cleaning. In 6 months, the baffle will completely fail. Under frequent fluctuations in operating conditions, the service life of the boiler economizer can only be maintained for 1 year. The non-baffle type flue gas temperature regulation system of the present invention can not only effectively solve the problems of blockage and corrosion, but also extend the service life of the economizer 2 to more than 4 years. When the impurities and ion content in the water in the serpentine tube exceeds the standard, crystalline substances are easily formed. The cleaning liquid in the cleaning liquid storage tank 4 enters from the inlet header 22 and is distributed to each serpentine tube bundle to complete the cleaning of the inner wall of the pipeline, which is convenient and efficient. It should be noted that according to the applicable temperature of the cleaning liquid, which is generally 45°C-60°C, the residual heat of the flue gas can be further used to insulate the cleaning liquid. When cleaning the outer wall of the serpentine tube bundle of the economizer 2, the cleaning liquid is flushed on the outer wall of the tube bundle through the external flushing mechanism 6 to further improve the cleaning efficiency.

[0036] Reference Figure 4 and Figure 5Specifically, in the embodiment of the present invention, the auxiliary temperature control mechanism includes a motor 41, a crank connecting rod 42, an inner sliding door 44 and a storage plate 45. The storage plate 45 is fixedly connected in the heat preservation box 3. The motor 41 is fixedly connected to the outer wall of the cleaning liquid storage tank 4, and its output shaft is fixedly connected to the crank connecting rod 42. The linkage end of the crank connecting rod 42 is movably connected to the inner sliding door 44. The inner sliding door 44 is slidably connected to the storage plate 45. A limit rod 43 parallel to the storage plate 45 is provided between the storage plate 45 and the outer wall of the cleaning liquid storage tank 4. The inner sliding door 44 is slidably connected to the limit rod 43. A temperature sensor 46 is provided inside the cleaning liquid storage tank 4 to monitor the temperature of the cleaning liquid in real time. The inner sliding door 44 and the storage plate 45 are provided with insulation cotton on one side surface close to the flue gas duct 1.

[0037] In the embodiment of the present invention, when it is necessary to utilize the residual heat in the flue gas, the motor 41 is started to drive the crank connecting rod 42 to rotate, so that the inner sliding door 44 slides away from each other along the limit rod 43, and then the flue gas contacts the outer wall of the cleaning liquid storage tank 4. It should be noted that the outer wall of the cleaning liquid storage tank 4 is a heat-conducting material, which facilitates the heat of the flue gas to contact the outer wall of the cleaning liquid storage tank 4, thereby heating and insulating the cleaning liquid and reducing heat loss.

[0038] Reference Figure 1 and Figure 2 Specifically, in the embodiment of the present invention, the outer wall of the heat preservation box 3 is fixedly connected with a liquid outlet pipe 31 connected to the cleaning liquid storage tank 4, and the liquid outlet pipe 31 is connected to the inlet header 22 through a pipeline.

[0039] In the embodiment of the present invention, when cleaning is required, the cleaning liquid is output from the liquid outlet pipe 31, passes through the inlet header 22 and the delivery pipe 24 and enters each serpentine tube bundle of the economizer 2 to complete the cleaning.

[0040] Reference Figure 3 and Figure 6 Specifically, in the embodiment of the present invention, the external flushing mechanism 6 includes a connector 61, a horizontal transport pipe 62 and a vertical pipe 64. The connector 61 is connected to the transport pipe 24 through a pipeline. A plurality of horizontal transport pipes 62 are provided, and are arranged in parallel at the top of the support pipe 5. A plurality of vertical pipes 64 are provided, and are fixedly connected to the horizontal transport pipe 62. Each horizontal transport pipe 62 is connected to the connector 61. A high-pressure nozzle 65 is fixedly connected to the outer wall of the vertical pipe 64. A solenoid valve 63 is detachably connected to the pipeline between the connector 61 and the transport pipe 24.

[0041] In an embodiment of the present invention, when it is necessary to clean the outer walls of each serpentine tube bundle of the economizer 2, the solenoid valve 63 controls the cleaning liquid to enter each horizontal transport pipe 62, and then diverts it to each vertical pipe 64, and finally the cleaning liquid is sprayed onto the outer walls of each serpentine tube through the high-pressure nozzle 65 for flushing, thereby washing away the attached dust and ensuring that the flue gas can fully contact the outer wall of the serpentine tube bundle.

[0042] Reference Figure 3 Specifically, in the embodiment of the present invention, the inner walls of the two heat-insulating partitions 11 are fixedly connected with a smoke temperature sensor 211 and a pressure sensor 212 .

[0043] In the embodiment of the present invention, the flue gas temperature entering and exiting the economizer 2 is detected by the flue gas temperature sensor 211 and the pressure sensor 212. When the flue gas temperature sensor 211 detects that the exhaust flue gas temperature is higher than the cleaning liquid temperature, the auxiliary temperature control mechanism works to heat the cleaning liquid. When the cleaning liquid temperature approaches 60°C, the auxiliary temperature control mechanism is closed to ensure the cleaning liquid temperature, which is suitable for efficient cleaning.

[0044] Reference Figure 1 Specifically, in the embodiment of the present invention, a filter screen 12 is detachably connected to the heat-insulating baffle 11 at the smoke inlet.

[0045] In the embodiment of the present invention, the filter screen 12 is used to block the dust that may be contained in the smoke, thereby reducing the probability of the dust adhering to the serpentine tube bundle and ensuring that the smoke can fully contact the serpentine tube bundle.

[0046] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas temperature regulating system applied to a yellow phosphorus tail gas boiler, characterized in that: include: A flue gas duct (1), the inner wall of which is fixedly connected with at least two heat-insulating baffles (11); An economizer (2) is arranged between the two heat-insulating baffles (11), a connecting cover (21) is fixedly connected between the heat-insulating baffles (11) and the economizer (2), and a water discharge assembly of the economizer (2) is arranged outside the flue gas duct (1); A heat preservation box (3) which is in communication with a side wall of a smoke outlet area of ​​the smoke duct (1); A cleaning liquid storage tank (4) is integrally arranged on the inner side of the heat preservation box (3); an auxiliary temperature control mechanism is arranged on a side of the cleaning liquid storage tank (4) close to the flue gas duct (1); the auxiliary temperature control mechanism controls the communication between the outer wall of the cleaning liquid storage tank (4) and the flue gas duct (1); A support pipe (5) arranged in the connection cover (21) on one side close to the air inlet of the flue gas duct (1), wherein a plurality of the support pipes (5) are arranged in parallel; An external flushing mechanism (6) is mounted on the support pipe (5) and is connected to a water discharge assembly of the economizer (2).

2. A flue gas temperature regulating system for yellow phosphorus tail gas boiler according to claim 1, characterized in that: The water discharge assembly comprises an inlet header (22) and an outlet header (23), wherein a delivery pipe (24) is fixedly connected between the inlet header (22) and the outlet header (23) and the economizer (2), and the delivery pipe (24) is provided with a plurality of extension pipes (25) and auxiliary connecting pipes (26) for installing valves.

3. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 1 is characterized in that: The auxiliary temperature control mechanism comprises a motor (41), a crank connecting rod (42), an inner sliding door (44) and a storage plate (45); the storage plate (45) is fixedly connected in the heat preservation box (3); the motor (41) is fixedly connected to the outer wall of the cleaning liquid storage tank (4); the output shaft of the motor (41) is fixedly connected to the crank connecting rod (42); the linkage end of the crank connecting rod (42) is movably connected to the inner sliding door (44); the inner sliding door (44) is slidably connected to the storage plate (45); a limit rod (43) arranged parallel to the storage plate (45) is arranged between the storage plate (45) and the outer wall of the cleaning liquid storage tank (4); the inner sliding door (44) is slidably connected to the limit rod (43); and a temperature sensor (46) is arranged inside the cleaning liquid storage tank (4).

4. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 1 is characterized in that: The outer wall of the heat preservation box (3) is fixedly connected with a liquid outlet pipe (31) which is in communication with the cleaning liquid storage tank (4); the liquid outlet pipe (31) is connected to the inlet header (22) via a pipeline.

5. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 1 is characterized in that: The external flushing mechanism (6) comprises a connector (61), a horizontal transport pipe (62) and a vertical pipe (64); the connector (61) is connected to the transport pipe (24) through a pipeline; a plurality of horizontal transport pipes (62) are provided and are arranged in parallel at the top of the support pipe (5); a plurality of vertical pipes (64) are provided and are fixedly connected to the horizontal transport pipe (62); each of the horizontal transport pipes (62) is connected to the connector (61); and a high-pressure nozzle (65) is fixedly connected to the outer wall of the vertical pipe (64).

6. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 1, characterized in that: The inner walls of the two heat-insulating partitions (11) are both fixedly connected with a smoke temperature sensor (211) and a pressure sensor (212).

7. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 1 is characterized in that: The heat-insulating baffle (11) at the smoke inlet is detachably connected to a filter screen (12).

8. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 3 is characterized in that: The inner sliding door (44) and the storage plate (45) are both provided with thermal insulation cotton on one side surface close to the smoke duct (1).

9. The smoke temperature regulating system for yellow phosphorus tail gas boiler according to claim 5, characterized in that: A solenoid valve (63) is detachably connected to the pipeline between the connector (61) and the delivery pipe (24).

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