Reactor for producing urea formaldehyde slow-release fertilizer

Abstract

The utility model discloses a reactor for producing a urea formaldehyde slow-release fertilizer, and relates to the technical field of fertilizer processing. The reactor for producing the urea formaldehyde slow-release fertilizer comprises a reaction vessel and an inner container, the inner container is arranged in the reaction vessel, a supporting circular ring is fixedly connected to the interior of the reaction vessel, and the inner container is fixedly connected to the inner wall of the supporting circular ring; the inner container is fixedly connected with a motor and a material injection pipeline; a cavity is formed between the inner container and the reaction vessel; an electric heating tube for heating the interior of the inner container is arranged on the inner wall of the inner container through a protective shell; a circulating box is fixedly connected to the surface of the reaction vessel, and a waste heat recovery mechanism is arranged on the circulating box. According to the reactor for producing the urea formaldehyde slow-release fertilizer, the inner container is reheated through heat of a water body, so that the heat is recycled, meanwhile, steam is injected into the water body, harmful substances in the steam can be adsorbed and purified through the water body, and environmental pollution caused by direct emission of the steam is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fertilizer processing, in particular to a reactor for producing urea formaldehyde slow-release fertilizer. Background Art

[0002] Urea formaldehyde slow-release compound fertilizer is a compound fertilizer produced by reacting urea with formaldehyde to produce urea formaldehyde solution and then bonding and granulating it. The main components of its nitrogen source urea formaldehyde are a series of long-chain condensates of urea and formaldehyde, such as methylidene urea and urea formaldehyde.

[0003] In the production of urea-formaldehyde slow-release fertilizer, urea and formaldehyde need to react in a heating reactor to generate a urea-formaldehyde solution. Most of the existing urea-formaldehyde production reactors are heated by steam. Since there is no waste gas and waste heat recovery device, and since formaldehyde has a low boiling point, it is easy to vaporize and evaporate, resulting in waste of raw materials and environmental pollution, and has low thermal efficiency and high energy consumption. In view of this, a reactor for producing urea-formaldehyde slow-release fertilizer is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a reactor for producing urea formaldehyde slow-release fertilizer, which can solve the problem that most of the existing urea formaldehyde production reactors are heated by steam and have no waste gas or waste heat recovery device.

[0005] To achieve the above object, the utility model provides the following technical solution: a reactor for producing urea formaldehyde slow-release fertilizer, comprising a reaction vessel and an inner liner, wherein the inner liner is arranged inside the reaction vessel, a supporting ring is fixedly connected inside the reaction vessel, and the inner liner is fixedly connected to the inner wall of the supporting ring;

[0006] The inner tank is fixedly connected with a motor and a material injection pipe;

[0007] There is a cavity between the inner tank and the reaction vessel;

[0008] An electric heating tube for heating the interior of the inner tank is arranged on the inner wall of the inner tank through a protective shell;

[0009] A circulation box is fixedly connected to the surface of the reaction vessel, and a waste heat recovery mechanism is arranged on the circulation box, and the waste heat recovery mechanism is used to recover and utilize the heat generated during the operation of the reactor;

[0010] The lower end of the inner tank is fixedly connected with a discharge pipe, and a valve is arranged on the discharge pipe.

[0011] Preferably, a stirring rod is rotatably connected inside the inner container, and the stirring rod is fixedly connected to the output end of the motor.

[0012] Preferably, the waste heat recovery mechanism comprises a recovery pipe, and both ends of the recovery pipe are respectively connected to the inner tank and the circulation box;

[0013] One end of the recovery pipe extending into the circulation box is fixedly connected with a jet pipe, and a nozzle is arranged on the jet pipe;

[0014] A first circulation pump is fixedly connected to the upper end of the circulation box, and a water inlet and a water outlet of the first circulation pump are respectively connected to the cavity and the circulation box through pipelines;

[0015] A second circulation pump is fixedly connected to the lower end of the circulation box, and a water inlet and a water outlet of the second circulation pump are also communicated with the cavity and the circulation box through pipelines.

[0016] Preferably, the circulation box is fixedly connected with a pressure relief valve, a water injection pipe and a sewage pipe. The sewage pipe is also provided with a valve, and water can be injected into the circulation box through the water injection pipe. When the internal pressure of the circulation box is high, the pressure relief valve can relieve the internal pressure to avoid the circulation box from bursting.

[0017] Preferably, a temperature sensor is fixedly connected to the interior of the circulation box, and the temperature sensor is electrically connected to the first circulation pump via a PLC circuit board.

[0018] Preferably, a one-way valve is provided on the nozzle, and the one-way valve can prevent water from flowing back into the interior of the jet pipe.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) In the reactor for producing urea formaldehyde slow-release fertilizer, when the temperature inside the circulation box reaches the specified temperature, the temperature sensor controls the first circulation pump to operate, so that the first circulation pump injects the heated water into the interior of the cavity, and then reheats the inner tank by the heat of the water itself, thereby realizing heat recovery and utilization. At the same time, steam is injected into the water, and harmful substances in the steam can be adsorbed and purified by the water, thereby reducing environmental pollution caused by direct steam emissions.

[0021] (2) In the reactor for producing urea formaldehyde slow-release fertilizer, the pressure relief valve can relieve the internal pressure of the circulation box when the internal pressure is high, thereby preventing the circulation box from bursting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of the structure of a reactor for producing urea formaldehyde slow-release fertilizer according to the utility model;

[0024] Figure 2This is a cross-sectional schematic diagram of a reactor for producing urea formaldehyde slow-release fertilizer according to the utility model;

[0025] Figure 3 The utility model is a schematic cross-sectional view of a reactor for producing urea formaldehyde slow-release fertilizer.

[0026] Figure numerals: 1, reaction vessel; 2, support ring; 3, inner tank; 4, motor; 5, injection pipe; 6, circulation box; 7, recovery pipe; 8, pressure relief valve; 9, water injection pipe; 10, sewage pipe; 11, first circulation pump; 12, discharge pipe; 13, stirring rod; 14, nozzle; 15, second circulation pump; 16, electric heating tube; 17, cavity; 18, temperature sensor; 19, jet pipe. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., 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 cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] See also Figure 1-3 The utility model provides a technical solution: a reactor for producing urea formaldehyde slow-release fertilizer, comprising a reaction vessel 1 and an inner liner 3, the inner liner 3 is arranged inside the reaction vessel 1, a support ring 2 is fixedly connected inside the reaction vessel 1, and the inner liner 3 is fixedly connected to the inner wall of the support ring 2;

[0032] The inner tank 3 is fixedly connected with a motor 4 and a material injection pipe 5;

[0033] There is a cavity 17 between the inner liner 3 and the reaction vessel 1;

[0034] An electric heating tube 16 for heating the interior of the inner pot 3 is provided on the inner wall of the inner pot 3 through a protective shell;

[0035] A circulation box 6 is fixedly connected to the surface of the reaction vessel 1, and a waste heat recovery mechanism is provided on the circulation box 6. The waste heat recovery mechanism is used to recover and utilize the heat generated during the operation of the reactor;

[0036] The lower end of the inner container 3 is fixedly connected to a discharge pipe 12, and a valve is provided on the discharge pipe 12;

[0037] When the slow-release fertilizer raw materials need to be processed, the raw materials can be injected into the inner container 3 through the injection pipe 5, and after the processing is completed, the discharge pipe 12 is opened by opening the valve, so that the processed slow-release fertilizer can flow out.

[0038] Furthermore, a stirring rod 13 is rotatably connected to the interior of the inner container 3, and the stirring rod 13 is fixedly connected to the output end of the motor 4;

[0039] By providing a stirring rod 13, when the motor 4 is started, the stirring rod 13 can mix and stir the raw materials inside the inner pot 3, so that the raw materials are heated more evenly, thereby accelerating the reaction speed.

[0040] Furthermore, the waste heat recovery mechanism includes a recovery pipe 7, and both ends of the recovery pipe 7 are respectively connected to the inner tank 3 and the circulation box 6;

[0041] The circulation box 6 is fixedly connected with a pressure relief valve 8, a water injection pipe 9 and a sewage pipe 10. The sewage pipe 10 is also provided with a valve, and water can be injected into the circulation box 6 through the water injection pipe 9. When the pressure inside the circulation box 6 is high, the pressure relief valve 8 can release the pressure inside the circulation box 6 to avoid the circulation box 6 from bursting.

[0042] The end of the recovery pipe 7 extending to the inside of the circulation box 6 is fixedly connected with a jet pipe 19, and the jet pipe 19 is provided with a nozzle 14, and the nozzle 14 is provided with a one-way valve;

[0043] The upper end of the circulation box 6 is fixedly connected with a first circulation pump 11, and the water inlet and the water outlet of the first circulation pump 11 are respectively connected with the cavity 17 and the circulation box 6 through pipelines;

[0044] The lower end of the circulation box 6 is fixedly connected to a second circulation pump 15, and the water inlet and the water outlet of the second circulation pump 15 are also connected to the cavity 17 and the circulation box 6 through pipelines.

[0045] When the electric heating tube 16 heats the inside of the inner tank 3, the raw material is heated to generate a little steam. At this time, the steam enters the inside of the jet pipe 19 through the recovery pipe 7. As the pressure continues to increase, the steam is ejected through the nozzle 14 and the one-way valve, and then heats the water inside the circulation box 6, thereby achieving heat exchange;

[0046] Furthermore, a temperature sensor 18 is fixedly connected inside the circulation box 6, and the temperature sensor 18 is electrically connected to the first circulation pump 11 through a PLC circuit board;

[0047] When the interior of the circulation box 6 reaches the specified temperature, the temperature sensor 18 controls the operation of the first circulation pump 11, so that the first circulation pump 11 injects the heated water into the interior of the cavity 17, and then reheats the inner tank 3 by the heat of the water itself, thereby realizing heat recovery and utilization. At the same time, steam is injected into the water, which can adsorb and purify harmful substances in the steam, thereby reducing environmental pollution caused by direct steam emissions.

[0048] By providing the pressure relief valve 8, it is possible to avoid the circulation box 6 from bursting due to high internal pressure.

[0049] The second circulation pump 15 can pump out the water in the cavity 17 and re-inject it into the circulation box 6, thereby completing the circulation of the water.

[0050] Working principle: When the electric heating tube 16 heats the inside of the inner tank 3, the raw material is heated to generate a little steam. At this time, the steam enters the inside of the jet pipe 19 through the recovery pipe 7. As the pressure continues to increase, the steam is ejected through the nozzle 14 and the one-way valve, and then heats the water inside the circulation box 6, thereby achieving heat exchange;

[0051] When the interior of the circulation box 6 reaches the specified temperature, the temperature sensor 18 controls the operation of the first circulation pump 11, so that the first circulation pump 11 injects the heated water into the interior of the cavity 17, and then reheats the inner tank 3 by the heat of the water itself, thereby realizing heat recovery and utilization. At the same time, steam is injected into the water, which can adsorb and purify harmful substances in the steam, thereby reducing environmental pollution caused by direct steam emissions.

[0052] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A reactor for producing urea formaldehyde slow-release fertilizer, comprising a reaction vessel (1) and an inner tank (3), characterized in that: The inner container (3) is arranged inside the reaction vessel (1), a supporting ring (2) is fixedly connected inside the reaction vessel (1), and the inner container (3) is fixedly connected to the inner wall of the supporting ring (2); The inner container (3) is fixedly connected with a motor (4) and a material injection pipe (5); There is a cavity (17) between the inner container (3) and the reaction vessel (1); An electric heating tube (16) for heating the interior of the inner container (3) is arranged on the inner wall of the inner container (3) through a protective shell; A circulation box (6) is fixedly connected to the surface of the reaction vessel (1), and a waste heat recovery mechanism is provided on the circulation box (6), and the waste heat recovery mechanism is used to recover and utilize the heat generated during the operation of the reactor; The lower end of the inner container (3) is fixedly connected to a discharge pipe (12), and a valve is provided on the discharge pipe (12).

2. A reactor for producing urea formaldehyde slow-release fertilizer according to claim 1, characterized in that: The inner part of the inner container (3) is rotatably connected to a stirring rod (13), and the stirring rod (13) is fixedly connected to the output end of the motor (4).

3. A reactor for producing urea formaldehyde slow-release fertilizer according to claim 2, characterized in that: The waste heat recovery mechanism comprises a recovery pipe (7), and two ends of the recovery pipe (7) are respectively connected to the inner tank (3) and the circulation box (6); A jet pipe (19) is fixedly connected to one end of the recovery pipe (7) extending into the interior of the circulation box (6), and a nozzle (14) is provided on the jet pipe (19); A first circulation pump (11) is fixedly connected to the upper end of the circulation box (6); a water inlet and a water outlet of the first circulation pump (11) are respectively connected to the cavity (17) and the circulation box (6) through pipelines; The lower end of the circulation box (6) is fixedly connected to a second circulation pump (15), and the water inlet and the water outlet of the second circulation pump (15) are also respectively connected to the cavity (17) and the circulation box (6) through pipelines.

4. A reactor for producing urea formaldehyde slow-release fertilizer according to claim 3, characterized in that: The circulation box (6) is fixedly connected with a pressure relief valve (8), a water injection pipe (9) and a sewage discharge pipe (10). The sewage discharge pipe (10) is also provided with a valve, and water can be injected into the circulation box (6) through the water injection pipe (9). When the pressure inside the circulation box (6) is high, the pressure relief valve (8) can relieve the internal pressure to avoid the circulation box (6) from bursting.

5. A reactor for producing urea formaldehyde slow-release fertilizer according to claim 4, characterized in that: A temperature sensor (18) is fixedly connected to the interior of the circulation box (6), and the temperature sensor (18) is electrically connected to the first circulation pump (11) via a PLC circuit board.

6. A reactor for producing urea formaldehyde slow-release fertilizer according to claim 5, characterized in that: The nozzle (14) is provided with a one-way valve, which can prevent water from flowing back into the interior of the jet pipe (19).

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