Urea pyrolysis reactor

Abstract

The utility model relates to the technical field of urea pyrolysis, and discloses a urea pyrolysis reactor which comprises an inner furnace body, an outer furnace body and a servo motor, the bottom of the inner furnace body is provided with an exhaust port, the outer side of the inner furnace body is provided with the outer furnace body, the inner wall of the outer furnace body is provided with a heat preservation pad, one side of the top of the outer furnace body is communicated with an air outlet pipe, and the top of the outer furnace body is communicated with an air inlet pipe. A spraying pipe penetrates through the top of the outer furnace body, a discharging assembly is installed on the inner wall of the outer furnace body, the bottom of the outer furnace body is in threaded connection with a waste residue box, a servo motor is fixedly connected to the top of the outer furnace body, and the output end of the servo motor is fixedly connected with a lead screw. By using the lead screw, the scraping disc and the brush, the lead screw rotates to drive the scraping disc to move so as to drive the brush to move, impurities on the inner wall of the inner furnace body and the spraying pipe can be removed at the same time, the problem that impurity crystals on the inner wall of the inner furnace body are difficult to clean is solved, and the utilization rate of heat energy is improved.

Description

Technical Field

[0001] The utility model relates to the field of urea pyrolysis, in particular to a urea pyrolysis reactor. Background Art

[0002] The technology of using reducing agent liquid ammonia to denitrify boiler flue gas has been gradually promoted. Among them, urea thermal decomposition and hydrolysis are the main technologies for preparing liquid ammonia. Urea will be deaminated into biuret when heated to 150-160℃. If heated rapidly, it will completely decompose into ammonia and carbon dioxide.

[0003] At present, a Chinese patent discloses a urea pyrolysis reactor, and its application number is 2023229180295. By arranging an outer furnace body, a heat-conducting ring and a heat-exchange fin, and designing the reactor into a double-layer furnace body structure consisting of an inner furnace body and an outer furnace body, ammonia and carbon dioxide and heat generated by pyrolysis in the inner furnace body enter the exhaust channel from the exhaust port, and the gas passes through the gap between the heat-exchange fins. The heat-exchange fins absorb the heat in the gas and transfer the heat to the inner furnace body through the heat-conducting ring, so as to achieve the effect of reusing the exhaust heat and reduce the energy consumption of the electric heater.

[0004] In combination with the above-mentioned disclosed technical solution, the spray gun can only be cleaned, and impurity crystals will remain on the inner wall. If it is not cleaned for a long time, the heat in the furnace will be lost, which will be wasted. In addition, long-term operation will cause too many impurity crystals to collect in the waste slag box, making it difficult to discharge the gas. Therefore, we proposed a urea pyrolysis reactor. Utility Model Content

[0005] In order to solve the technical problem of removing impurity crystals, the utility model provides a urea pyrolysis reactor.

[0006] The utility model adopts the following technical scheme: a urea pyrolysis reactor, comprising an inner furnace body, an outer furnace body and a servo motor, an exhaust port is opened at the bottom of the inner furnace body, an outer furnace body is arranged outside the inner furnace body, a heat preservation pad is arranged on the inner wall of the outer furnace body, and an exhaust pipe is connected to one side of the top of the outer furnace body.

[0007] The top of the outer furnace body is connected with an air inlet pipe, the top of the outer furnace body is penetrated by a spray pipe, a discharge assembly is installed on the inner wall of the outer furnace body, and a waste slag box is threadedly connected to the bottom of the outer furnace body.

[0008] The servo motor is fixedly connected to the top of the outer furnace body, the output end of the servo motor is fixedly connected to a screw rod, the end of the screw rod away from the servo motor is rotatably connected to the bottom of the inner wall of the inner furnace body, the surface of the screw rod is threadedly connected to a scraper, the inner side of the scraper is fixedly connected to a brush through a connecting rod, and the bottom of the brush is fixedly connected to an extrusion rod through a U-shaped frame.

[0009] As a further improvement of the above solution, a heat-conducting ring is installed on the outer wall of the inner furnace body, and heat-exchanging fins are connected to the outer wall of the heat-conducting ring at equal intervals to reuse the discharged heat.

[0010] As a further improvement of the above solution, a gap is provided between the inner furnace body and the outer furnace body to form an exhaust passage to discharge ammonia and carbon dioxide.

[0011] As a further improvement of the above scheme, the unloading assembly includes two springs, a conical plug and a conical bucket. The conical bucket is fixedly connected to the inner wall of the outer furnace body. The two ends of the spring are respectively connected to the two sides of the conical plug and the bottom of the conical bucket. The top of the conical plug abuts against the discharge hole opened at the bottom of the conical bucket to collect impurity crystals.

[0012] As a further improvement of the above solution, a limit rod is provided through the side of the scraper away from the screw rod, and the two ends of the limit rod are respectively fixedly connected to the top and bottom of the inner wall of the inner furnace body to limit the movement of the scraper.

[0013] As a further improvement of the above solution, the extrusion rod is located above the conical plug, and the diameter of the extrusion rod is smaller than the diameter of the top of the conical plug, so as to open the conical plug.

[0014] As a further improvement of the above solution, the bottom of the inner furnace body is conical and has holes at the bottom to temporarily collect the impurity crystals.

[0015] As a further improvement of the above solution, the brush is in a circular ring shape and is located below the spray pipe to brush the spray pipe to prevent the spray pipe from being blocked.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model uses a screw rod, a scraper and a brush, so that the rotation of the screw rod drives the scraper to move, thereby driving the brush to move, and can simultaneously remove impurities from the inner wall of the inner furnace body and the spray pipe, solving the problem of difficulty in cleaning impurity crystals on the inner wall of the inner furnace body and improving the utilization rate of thermal energy.

[0018] 2. The utility model uses an extrusion rod and a conical plug, so that after the extrusion rod squeezes the conical plug, impurity crystals on the surface of the conical bucket can fall into the waste slag box, solving the problem that the device is difficult to work for a long time and improving the sustainability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3This is a schematic diagram of the structure of the heat-conducting ring and heat-exchanging fins of the utility model;

[0022] Figure 4 It is a schematic diagram of the structure of the inner furnace body, outer furnace body and insulation pad of the utility model.

[0023] Description of main symbols:

[0024] 1. Outer furnace body; 2. Waste slag box; 3. Exhaust pipe; 4. Spray pipe; 5. Servo motor; 6. Inner furnace body; 7. Scraper; 8. Brush; 9. Extrusion rod; 10. Conical bucket; 11. Conical plug; 12. Screw rod; 13. Heat exchange fins; 14. Heat transfer ring; 15. Insulation pad; 16. Limit rod. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0026] Embodiment 1:

[0027] Please combine Figure 1-4 A urea pyrolysis reactor of the present embodiment includes an inner furnace body 6 for performing pyrolysis reaction, an exhaust port is provided at the bottom of the inner furnace body 6, an outer furnace body 1 is provided outside the inner furnace body 6, an insulation pad 15 is provided on the inner wall of the outer furnace body 1, an outlet pipe 3 for discharging ammonia and carbon dioxide is provided on one side of the top of the outer furnace body 1, a heat conducting ring 14 is installed on the outer wall of the inner furnace body 6, and heat exchange fins 13 are connected to the outer wall of the heat conducting ring 14 at equal intervals. There is a gap between the inner furnace body 6 and the outer furnace body 1 to form an exhaust channel, and the bottom of the inner furnace body 6 is conical and has a through hole.

[0028] An outer furnace body 1 for protecting the device has an air inlet pipe for introducing high-temperature and high-pressure air at the top of the outer furnace body 1, one end of the air inlet pipe is divided into four air outlets, a spray pipe 4 with an atomized urea solution is passed through the top of the outer furnace body 1, a discharge assembly is installed on the inner wall of the outer furnace body 1, the discharge assembly includes two springs, a conical plug 11 and a conical bucket 10, the conical bucket 10 is fixedly connected to the inner wall of the outer furnace body 1, the two ends of the spring are respectively connected to the two sides of the conical plug 11 and the bottom of the conical bucket 10, the top of the conical plug 11 abuts against the discharge hole opened at the bottom of the conical bucket 10, the bottom of the outer furnace body 1 is threadedly connected to a waste slag box 2 for collecting waste slag, the top of the outer wall of the waste slag box 2 is provided with an external thread, and the bottom of the inner wall of the outer furnace body 1 is provided with an internal thread.

[0029] A servo motor 5 drives a screw rod 12 to rotate, and the servo motor 5 is fixedly connected to the top of the outer furnace body 1. The output end of the servo servo motor 5 is fixedly connected to the screw rod 12. The end of the screw rod 12 away from the motor is rotatably connected to the bottom of the inner wall of the inner furnace body 6. The surface of the screw rod 12 is threadedly connected to a scraper 7 for scraping impurity crystals on the inner wall of the inner furnace body 1. A limiting rod 16 is penetrated through the side of the scraper 7 away from the screw rod 12. The two ends of the limiting rod 16 are respectively fixedly connected to the top and bottom of the inner wall of the inner furnace body 6. The inner side of the scraper 7 is fixedly connected to a brush 8 for brushing the spray pipe 4 through a connecting rod. The brush 8 is annular and is located below the spray pipe 4. The bottom of the brush 8 is fixedly connected to an extrusion rod 9 for extruding a conical plug 11 through a U-shaped frame. The extrusion rod 9 is located above the conical plug 11, and the diameter of the extrusion rod 9 is smaller than the diameter of the top of the conical plug 11.

[0030] The implementation principle of a urea pyrolysis reactor in the embodiment of the present application is as follows: when the user actually uses the reactor to perform urea pyrolysis, first the modulated urea solution is connected to the spray pipe 4 through the urea solution, and the urea solution is sprayed out through the spray pipe 4 in atomized form. At the same time, high-temperature and high-pressure air is introduced into the air inlet at the top of the inner furnace body 6 to thermally decompose the urea solution. The private service motor 5 is turned on to drive the screw rod 12 to rotate, and the rotation of the screw rod 12 drives the scraper 7 to move to scrape off the impurity crystals on the inner wall of the inner furnace body 6, and the impurity crystals fall on the conical bucket 10. When the scraper 7 moves to the upper part of the inner furnace body 6, the scraper 7 drives the brush 8 to brush the spray pipe 4 to prevent the spray pipe 4 from being blocked. When the scraper 7 moves to the lower part of the inner furnace body 6, the scraper 7 drives the extrusion rod 9 to squeeze the conical plug 11 so that the conical plug 11 is The plug 11 is opened, so that the impurity crystals fall into the waste slag box 2. When the extrusion rod 9 moves to be separated from the conical plug 11, due to the use of the spring, the conical plug 11 is re-contacted against the bottom of the conical bucket 10 to prevent heat loss. When the waste slag box 2 is full of impurity crystals, the servo motor 5 is turned off, the waste slag box 2 is removed, and the impurity crystals therein are poured out. The urea solution decomposes at high temperature to generate ammonia and carbon dioxide. Ammonia and carbon dioxide enter the exhaust channel from the exhaust port of the inner furnace body 6, and then enter the exhaust pipe 3 from the exhaust channel for circulation. During the circulation of ammonia, carbon dioxide and heat in the exhaust channel, the gas passes through the gap between the heat exchange fins 13. The heat exchange fins 13 absorb the heat in the gas and transfer the heat to the inner furnace body 6 through the heat conductive ring 14, so as to achieve the effect of reusing the exhaust heat.

[0031] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A urea pyrolysis reactor, characterized in that: include: An inner furnace body (6), wherein an exhaust port is provided at the bottom of the inner furnace body (6), an outer furnace body (1) is provided outside the inner furnace body (6), a heat preservation pad (15) is provided on the inner wall of the outer furnace body (1), and an exhaust pipe (3) is connected to one side of the top of the outer furnace body (1); An outer furnace body (1), the top of the outer furnace body (1) being connected to an air inlet pipe, the top of the outer furnace body (1) being penetrated by a spray pipe (4), an inner wall of the outer furnace body (1) being provided with a discharge assembly, and the bottom of the outer furnace body (1) being threadedly connected to a waste slag box (2); A servo motor (5) is fixedly connected to the top of the outer furnace body (1); the output end of the servo motor (5) is fixedly connected to a screw rod (12); one end of the screw rod (12) away from the servo motor (5) is rotatably connected to the bottom of the inner wall of the inner furnace body (6); a scraper (7) is threadedly connected to the surface of the screw rod (12); a brush (8) is fixedly connected to the inner side of the scraper (7) via a connecting rod; and the bottom of the brush (8) is fixedly connected to an extrusion rod (9) via a U-shaped frame.

2. A urea pyrolysis reactor according to claim 1, characterized in that: A heat-conducting ring (14) is installed on the outer wall of the inner furnace body (6), and heat-exchanging fins (13) are connected to the outer wall of the heat-conducting ring (14) at equal intervals.

3. A urea pyrolysis reactor according to claim 1, characterized in that: There is a gap between the inner furnace body (6) and the outer furnace body (1) to form an exhaust passage.

4. A urea pyrolysis reactor according to claim 1, characterized in that: The unloading assembly comprises two springs, a conical plug (11) and a conical bucket (10); the conical bucket (10) is fixedly connected to the inner wall of the outer furnace body (1); the two ends of the spring are respectively connected to the two sides of the conical plug (11) and the bottom of the conical bucket (10); the top of the conical plug (11) abuts against a discharge hole opened at the bottom of the conical bucket (10).

5. A urea pyrolysis reactor according to claim 1, characterized in that: A limiting rod (16) is provided through the side of the scraper (7) away from the screw rod (12), and the two ends of the limiting rod (16) are respectively fixedly connected to the top and bottom of the inner wall of the inner furnace body (6).

6. A urea pyrolysis reactor according to claim 1, characterized in that: The bottom of the inner furnace body (6) is conical.

7. A urea pyrolysis reactor according to claim 1, characterized in that: The brush (8) is annular and is located below the spray pipe (4).

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