Dust removal device for scraper of urea prilling tower

Abstract

The utility model particularly relates to a dust removal device for a scraper of a urea prilling tower. Comprising a urea prilling tower scraper, a feed opening of the urea prilling tower scraper is connected with the bottom of a packaging belt conveyor through a lower conical cylinder, and a water seal dustproof unit used for dissolving urea is arranged between the feed opening of the urea prilling tower scraper and the lower conical cylinder. The water seal dustproof unit comprises a dust collection water tank which is arranged on the lower conical cylinder, is provided with a top opening and is used for containing water, and a dust baffle extending into the dust collection water tank is arranged at a discharging opening of the urea prilling tower scraper; the device has the characteristics of preventing dust from overflowing, being environment-friendly, saving resources, reducing the labor intensity of on-site cleaning personnel and preventing urea dust from harming the body health of on-site personnel.

Description

Technical Field

[0001] The utility model relates to the technical field of urea production dust removal equipment, in particular to a dust removal device for a urea granulation tower scraper. Background Art

[0002] Urea granulation tower is an important equipment for making hot high-concentration urea solution into urea granules in the urea production process. Urea dust will inevitably be generated during the operation of the urea granulation tower. Urea dust has the following problems: First, it pollutes the environment. Urea dust is very harmful to the environment. 90% to 99% of the dust discharged by the granulation tower is urea dust that is easily soluble in water. In humid and rainy areas, dust often dissolves and merges into large particles, which quickly fall on the factory area and its vicinity, forming a highly corrosive atmospheric environment, corroding the road surface, rusting metal facilities, and damaging buildings; finally, it endangers human health. Urea dust particles contain free ammonia. On-site cleaning personnel and staff are at the work site for a long time. After the human body inhales urea dust, it irritates the respiratory mucosa. In order to solve the above technical problems, some enterprises choose to install a bag dust removal device on the top of the granulation tower. After the bag dust removal device has been in operation for a long time, the urea dust blocked by the dust bag absorbs moisture in the cold air and forms lumps on the surface of the dust bag, which increases the pressure difference of the dust bag and the replacement frequency. At the same time, the dust removal device has a small deformation amplitude during pulse backblowing, which makes it difficult to backblow the urea dust adsorbed on the surface, resulting in increased difficulty in recycling and reuse, and it is difficult to achieve long-term stable operation. In addition, the bag dust removal device is installed at a high position, which makes installation and maintenance difficult. Furthermore, it is generally installed at the top of the granulation tower, so the dust removal effect at the bottom of the granulation tower is not obvious. With the increase of urea production load, the amount of dust at the bottom of the granulation tower increases day by day. The on-site cleaning staff cleans up to 300kg every day, which not only increases labor intensity, but also harms the health of personnel and easily causes environmental risks. Utility Model Content

[0003] The utility model aims to provide a dust removal device for a urea granulation tower scraper to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A dust removal device for a urea granulation tower scraper comprises a urea granulation tower scraper, wherein a discharge port of the urea granulation tower scraper is connected to the bottom of a packaging belt conveyor through a lower cone, a water-sealed dust-proof unit for dissolving urea is provided between the discharge port of the urea granulation tower scraper and the lower cone, the water-sealed dust-proof unit comprises a dust collecting water tank which is provided on the lower cone and has a top opening and is used to contain water, and a dust shield extending to the inside of the dust collecting water tank is provided at the discharge port of the urea granulation tower scraper.

[0006] The beneficial effects of the utility model are as follows: the utility model utilizes the characteristic that urea is easily soluble in water, and sets a water-sealed dust-proof unit between the discharge port and the lower cone of the urea granulation tower scraper, thereby achieving the purpose of preventing urea dust from overflowing; specifically, the dust is blocked by the dust shield, and under the action of gravity, the urea dust enters the dust collecting tank and dissolves quickly, thereby preventing dust from overflowing, achieving the characteristics of being environmentally friendly, reducing the labor intensity of on-site cleaning personnel, and preventing urea dust from endangering the health of on-site personnel.

[0007] Preferably, the bottom of the discharge port of the urea granulation tower scraper is sleeved on the inner top of the lower cone, the dust collecting trough is arranged on the upper outer circumference of the lower cone, the upper part of the dust shield is fixedly connected to the outside of the urea granulation tower scraper, and the lower part of the dust shield extends to the inside of the dust collecting trough.

[0008] Preferably, a shower pipe with a shower valve is provided at the bottom of the dust collecting water tank, and the end of the shower pipe is connected to the inlet of the urea solution tank.

[0009] Preferably, an overflow pipe with an overflow valve is provided on one side of the upper portion of the dust collecting water tank, and the end of the overflow pipe is connected to the inlet of the urea solution tank.

[0010] Preferably, the upper part of the dust collecting water tank is connected to a desalted water pipe with a water replenishment valve.

[0011] Preferably, the inlet of the overflow pipe is at the same height as the liquid level line of the dust collecting tank.

[0012] Preferably, the dust collecting water tank is provided with a liquid level meter and a urea concentration detector.

[0013] A dust removal device for a urea granulation tower scraper made according to the above scheme, by utilizing the fact that urea is easily soluble in water, a water-sealed dust-proof unit is arranged in the gap between the discharge port and the lower cone of the urea granulation tower scraper, so that during the dispersion of urea dust, the urea dust is dissolved in the dust collecting water tank under the action of the dust baffle and gravity, thereby preventing the dust from overflowing; further, a shower guide pipe is arranged at the bottom of the dust collecting water tank described in the utility model, and when the urea content in the water in the water-sealed dust-proof unit is too high, it can be transported to the urea solution tank through the shower guide pipe to fully utilize the urea dust. (The reuse process includes transporting the urea solution in the urea solution tank to the urea granulation tower for re-granulation through primary flash evaporation, secondary flash evaporation and urea melting pump and other equipment); further, the utility model is also provided with an overflow pipe. When the urea dust is large and the liquid level in the water seal rises, it can overflow into the urea solution tank through the overflow pipe in time, so as to achieve the reuse of urea and avoid the defect of overflow to the outside; it has the characteristics of avoiding dust overflow, so as to be environmentally friendly, save resources, reduce the labor intensity of on-site cleaning personnel and avoid urea dust endangering the health of on-site personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] In the figure: 1. Urea granulation tower scraper; 2. Lower cone; 3. Dust collecting trough; 4. Dust shield; 5. Drain valve; 6. Urea solution tank; 7. Overflow valve; 8. Water supply valve; 9. Liquid level meter; 10. Urea concentration detector; 11. Packing belt conveyor. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Reference Figure 1 As shown, a dust removal device for a urea granulation tower scraper comprises a urea granulation tower scraper 1, a discharge port of the urea granulation tower scraper 1 is connected to the bottom of a packaging belt conveyor 11 through a lower cone 2, a water seal dustproof unit for dissolving urea is provided between the discharge port of the urea granulation tower scraper 1 and the lower cone 2, the water seal dustproof unit comprises a dust collecting water tank 3 which is provided on the lower cone 2 and has a top opening and is used to hold water, and a dust shield plate 4 extending to the inside of the dust collecting water tank 3 is provided at the discharge port of the urea granulation tower scraper 1. The utility model utilizes the characteristic that urea is easily soluble in water, and arranges a water-sealed dust-proof unit on the gap between the discharge port of the lower scraper 1 of the urea granulation tower and the lower cone 2, so that the floating urea dust enters the dust collecting tank 3 under the dual effects of gravity and the dust shield 4, and the urea dust is dissolved and recovered, so as to avoid the problem that the urea dust overflows to the outside of the equipment to cause environmental pollution and the urea dust harms the health of on-site personnel; at the same time, it can also reduce the labor intensity of on-site cleaning personnel.

[0018] Furthermore, the bottom of the discharge port of the urea granulation tower scraper 1 is sleeved on the inner top of the lower cone 2, the dust collecting water tank 3 is arranged on the upper outer circumference of the lower cone 2, the upper part of the dust shield 4 is fixedly connected to the outside of the urea granulation tower scraper 1, and the lower part of the dust shield 4 extends to the inside of the dust collecting water tank 3. The water seal dustproof unit is set on the premise that it does not hinder the discharge of the discharge port of the scraper 1 to the lower cone 2. Preferably, the water seal dustproof unit is set at the discharge port of the urea granulation tower scraper 1 and the outside of the lower cone 2, so as to achieve the purpose of dust removal under the premise of ensuring the normal operation of the original equipment.

[0019] Furthermore, a drain pipe with a drain valve 5 is provided at the bottom of the dust collecting tank 3, and the end of the drain pipe is connected to the inlet of the urea solution tank 6. By providing the drain pipe with the drain valve 5, the urea dust dissolved in the desalted water can be recovered to avoid the problem of waste of resources.

[0020] Furthermore, an overflow pipe with an overflow valve 7 is provided on one side of the upper part of the dust collecting water tank 3, and the end of the overflow pipe is connected to the inlet of the urea solution tank 6. By providing the overflow pipe with the overflow valve 7, the problem of excessive dissolution of urea dust, the increase of the liquid level in the water seal and overflow to the outside can be avoided; at the same time, the purpose of recovering the urea dust dissolved in the desalted water is achieved.

[0021] Further, the upper part of the dust collecting water tank 3 is connected to a desalted water pipe with a water replenishment valve 8. By providing the desalted water pipe with a water replenishment valve 8, the dust collecting water tank 3 can be replenished with desalted water in time to achieve a dustproof effect.

[0022] Furthermore, the inlet of the overflow pipe is at the same height as the liquid level line of the dust collecting tank 3 .

[0023] Furthermore, a liquid level meter 9 and a urea concentration detector 10 are provided on the dust collecting water tank 3 .

[0024] The working principle of the utility model is as follows: first, the desalted water is allowed to enter the dust collecting tank 3 through the desalted water pipeline with the water replenishment valve 8, and the liquid level meter 9 detects the liquid level of the desalted water in the dust collecting tank 3. The liquid level of the desalted water is preferably the full liquid level (at the same height as the inlet of the overflow pipe), and the urea granulation tower is started to allow the urea granules to enter the lower cone 2 from the discharge port of the scraper 1, and finally transported to the packaging system through the packaging belt conveyor 11; a large amount of urea dust is generated in the above process, which is blocked by the dust baffle 4 and enters the desalted water in the dust collecting tank 3 by gravity for dissolution; in the above process, the liquid level meter 9 detects the liquid level in the dust collecting tank 3 in real time to keep it in a full liquid level state; when there is a lot of urea dust and the liquid level in the water seal rises, it can overflow to the urea solution tank 6 through the overflow pipe in time; when the liquid level is lower than 90%, the water replenishment valve 8 is opened to make The desalted water enters the dust collecting water tank 3 and is filled up in time; the above method can effectively ensure the dust removal effect; at the same time, the urea concentration detector 10 detects the urea concentration in the dust collecting water tank 3. When the urea concentration in the dust collecting water tank 3 is not less than 30%, the drain valve 5 is opened, and the urea solution in the dust collecting water tank 3 enters the urea solution tank 6 through the drain pipe. After draining, the water replenishment valve 8 is opened to allow the desalted water in the desalted water pipe to quickly enter the dust collecting water tank 3 and replenish the desalted water to the full liquid level; the urea solution in the above urea solution tank 6 can enter the urea granulation tower for granulation through the traditional one-stage evaporation system, the two-stage evaporation system and the melting pump to realize the recycling of resources; the utility model has a simple structure, easy to control the process, low operation and maintenance cost, material recycling, greatly reducing the amount of urea dust at the bottom of the granulation tower, protecting the health of personnel, and reducing environmental pollution. The water seal liquid is recovered to the urine tank, reducing the waste of resources. By using the utility model, the daily cleaning amount of 300kg by on-site cleaning personnel can be reduced to less than 50kg, so that the environment at the bottom of the granulating tower is significantly improved, and the life and health of personnel are protected.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dust removal device for a urea granulation tower scraper, comprising a urea granulation tower scraper (1), characterized in that: The discharge port of the urea granulation tower scraper (1) is connected to the bottom of the packaging belt conveyor (11) through the lower cone (2), and a water seal dust prevention unit for dissolving urea is provided between the discharge port of the urea granulation tower scraper (1) and the lower cone (2). The water-sealed dustproof unit comprises a dust collecting water tank (3) provided with a top opening and used for containing water, which is arranged on the lower cone (2); a dust shield (4) extending into the interior of the dust collecting water tank (3) is provided at the discharge port of the urea granulation tower scraper (1).

2. A dust removal device for a urea granulation tower scraper according to claim 1, characterized in that: The bottom of the feed outlet of the urea granulation tower scraper (1) is sleeved on the inner top of the lower cone (2). The dust collecting trough (3) is arranged on the upper outer circumference of the lower cone (2), the upper part of the dust shield (4) is fixedly connected to the outside of the urea granulation tower scraper (1), and the lower part of the dust shield (4) extends to the inside of the dust collecting trough (3).

3. The dust removal device for a urea granulation tower scraper according to claim 1, characterized in that: A shower pipe with a shower valve (5) is provided at the bottom of the dust collecting water tank (3), and the end of the shower pipe is connected to the inlet of the urea solution tank (6).

4. A dust removal device for a urea granulation tower scraper according to claim 2 or 3, characterized in that: An overflow pipe with an overflow valve (7) is provided on one side of the upper portion of the dust collecting water tank (3), and the end of the overflow pipe is connected to the inlet of the urea solution tank (6).

5. A dust removal device for a urea granulation tower scraper according to claim 4, characterized in that: The upper part of the dust collecting water tank (3) is provided with a desalted water pipeline with a water replenishment valve (8) connected thereto.

6. A dust removal device for a urea granulation tower scraper according to claim 4, characterized in that: The inlet of the overflow pipe is at the same height as the liquid level line of the dust collecting tank (3).

7. The dust removal device for a urea granulation tower scraper according to claim 1, characterized in that: The dust collecting water tank (3) is provided with a liquid level meter (9) and a urea concentration detector (10).

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