CN211612118U - A urea granulation tower top dust recovery device - Google Patents

Abstract

The utility model discloses a dust recovery device at the top of a urea granulation tower, comprising a recovery tower, an air inlet, an exhaust port, a dust collection cavity, a recovery pump, a washing pump, a washing liquid storage box and a washing recovery mechanism. The air inlet is arranged at the bottom of the recovery tower, the exhaust outlet is arranged at the top of the recovery tower, the dust collection chamber is arranged at the bottom of the recovery tower, the air inlet is provided with a blower, and the washing and recovery mechanism is arranged at the recovery tower Inside, the washing pump and the washing recovery mechanism are connected through a pipeline, the washing liquid storage tank and the washing pump are connected through a pipeline, the recovery pump and the dust collection chamber are connected through a pipeline, and the washing liquid storage tank is provided with a washing liquid . The utility model belongs to the technical field of urea recovery, and in particular provides a urea prilling tower that performs double thorough dust washing and absorption through a washing and recovery mechanism, and is controlled and automatically detected by a urea concentration detector to perform circulating washing or recovery pumping operations Top dust recovery device.

Description

A urea granulation tower top dust recovery device

technical field

The utility model belongs to the technical field of urea recovery, in particular to a urea granulation tower top dust recovery device.

Background technique

Urea is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen. It is a white crystal and is the product of animal protein metabolism. In industry, ammonia and carbon dioxide are used to synthesize urea under certain conditions. As a neutral fertilizer, urea It is suitable for all kinds of soil and plants. It is easy to store and easy to use. It is a kind of chemical nitrogen fertilizer that is used in a large amount at present. In the urea production of chemical fertilizer plants in my country, the prilling towers are generally cylindrical or rectangular tall concrete structures. The granulation tower sprays the urea molten material through the granulation nozzle and cools down by natural ventilation to form urea granule products.

Due to the chemical reaction process, nozzle injection and abnormal operation status, etc., the exhaust gas at the top of the prilling tower contains a non-negligible amount of dust. With the expansion of the production scale, the loss of value and the pollution to the environment are becoming more and more serious. , about 1.5 ~ 4.5kg of dust will be generated per ton of material sprayed, and a large part of the discharged dust will fall around the prilling tower and near the plant, which greatly increases the atmospheric corrosion strength of the plant and its vicinity, causing metal facilities to be corroded, Cracked concrete pavements, reduced crop yields and yellowing of other plants.

Utility model content

In order to solve the above-mentioned existing problems, the utility model provides a urea prilling tower tower top that performs double thorough dust washing and absorption through a washing and recovery mechanism, and is controlled and automatically detected by a urea concentration detector for circulating washing or recovery pumping operation. Dust recovery device.

The technical scheme adopted by the utility model is as follows: the utility model of the urea granulation tower top dust recovery device includes a recovery tower, an air inlet, an exhaust port, a dust collection cavity, a recovery pump, a washing pump, a washing liquid storage tank and a washing Recovery mechanism, the air inlet is arranged at the bottom of the recovery tower, the exhaust port is arranged at the top of the recovery tower, the dust collection cavity is arranged at the bottom of the recovery tower, the upper end of the dust collection cavity is provided with an opening, the dust collection The horizontal position of the collection chamber is lower than the horizontal position of the air inlet, the air inlet is provided with a blower, the washing and recovery mechanism is arranged in the recovery tower and below the exhaust port, and the washing pump and the washing and recovery mechanism are connected by pipes, The washing liquid storage tank and the washing pump are connected through a pipeline, the recovery pump and the dust collection chamber are connected through a pipeline, and the washing liquid storage tank is provided with washing liquid; A stage liquid distributor, a first stage atomizing nozzle, a second stage atomizing nozzle and a packing plate, the first stage liquid distributor and the second stage liquid distributor are horizontally arranged in the recovery tower, and the first stage liquid distributor is located in the second stage liquid distributor Above the device, the first-level atomizing nozzles are evenly distributed on the first-level liquid distributor and face downward, the second-level atomizing nozzles are evenly distributed on the second-level liquid distributor and facing upward, and the packing plate is arranged on the Between the first-level liquid distributor and the second-level liquid distributor, the first-level liquid distributor and the second-level liquid distributor are both connected with the washing pump through pipes.

Further, a demisting layer is arranged above the first-level liquid distributor in the recovery tower, and the demisting layer is a mist eliminator provided with a plurality of parallel and spaced blades, and the surface of the mist eliminator is provided with a mesh structure layer, The mesh structure layer can not only reduce the scour of the air flow on the blade surface, but also increase the specific area of the blade surface, which is helpful for the formation of a water film to capture droplets with small particle size and can quickly drain the flow, further realizing efficient mist removal. .

Further, a urea concentration detector is arranged in the washing liquid storage tank, and the washing pump is connected with the washing liquid storage tank through a pipeline.

Further, a controller is also provided on the washing liquid storage tank, and the urea concentration detector, the recovery pump and the washing pump are all connected to the controller.

Further, guide holes are evenly arranged on the packing plate, and the guide holes are arranged in an inverted conical shape.

The beneficial effects obtained by adopting the above-mentioned structure of the present utility model are as follows: In this scheme, the dust recovery device at the top of the urea granulation tower, aiming at the upward movement direction of the gas containing urea dust, sets the washing and recovery mechanism above the air inlet, and through atomization The dust in the gas is fully absorbed by spraying and countercurrent impact, and as the large particle dust is easy to settle, a dust collection chamber is set up as a support, and multiple washing effects are formed by setting a first-level liquid distributor and a second-level liquid distributor, and setting packing The inverted conical guide holes on the plate increase the time of gas retention and scrubbing liquid absorption, which further strengthens the thoroughness of dust absorption and the purity of gas scrubbing, and the urea concentration detector is set through the controller to make the scrubbing pump and recovery. The pump can control the cycle washing and urea recovery by itself.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a urea prilling tower top dust recovery device of the present invention.

Among them, 1. Recovery tower, 2. Air inlet, 3. Exhaust port, 4. Dust collection chamber, 5. Recovery pump, 6. Washing pump, 7. Washing liquid storage tank, 8. Washing recovery mechanism, 9. Blower, 10, first-level liquid distributor, 11, second-level liquid distributor, 12, first-level atomizing nozzle, 13, second-level atomizing nozzle, 14, packing plate, 15, defogging layer, 16, urea concentration detection device, 17, guide hole.

Detailed ways

In conjunction with the accompanying drawings, the present utility model will be further described in detail.

As shown in Figure 1, the utility model urea granulation tower tower top dust recovery device, including recovery tower 1, air inlet 2, exhaust port 3, dust collection cavity 4, recovery pump 5, washing pump 6, washing liquid storage Box 7 and washing recovery mechanism 8, the air inlet 2 is arranged at the bottom of the recovery tower 1, the exhaust port 3 is arranged at the top of the recovery tower 1, the dust collection cavity 4 is arranged at the bottom of the recovery tower 1, the The upper end of the dust collection chamber 4 is provided with an opening, the horizontal position of the dust collection chamber 4 is lower than the horizontal position of the air inlet 2, the air inlet 2 is provided with a blower 9, and the washing and recovery mechanism 8 is arranged in the recovery tower 1 And located below the exhaust port 3, the washing pump 6 and the washing recovery mechanism 8 are connected through a pipeline, the washing liquid storage tank 7 and the washing pump 6 are connected through a pipeline, and the recovery pump 5 and the dust collection chamber 4 are connected through a pipeline. , the washing liquid storage tank 7 is provided with washing liquid; the washing recovery mechanism 8 includes a primary liquid distributor 10, a secondary liquid distributor 11, a primary atomizing nozzle 12, a secondary atomizing nozzle 13 and fillers Plate 14, the primary liquid distributor 10 and the secondary liquid distributor 11 are horizontally arranged in the recovery tower 1 and the primary liquid distributor 10 is located above the secondary liquid distributor 11, and the primary atomizing nozzle 12 is uniform Distributed on the primary liquid distributor 10 and facing downward, the secondary atomizing nozzles 13 are evenly distributed on the secondary liquid distributor 11 and face upward, and the packing plates 14 are provided on the primary liquid distributor 10 and Between the secondary liquid distributors 11 , the primary liquid distributor 10 and the secondary liquid distributor 11 are both connected to the washing pump 6 through pipes.

Wherein, the first-stage liquid distributor 10 in the recovery tower 1 is provided with a demisting layer 15; the washing liquid storage tank 7 is provided with a urea concentration detector 16, and the washing pump 6 passes through the pipeline and the washing liquid storage tank. 7 is connected; the washing liquid storage tank 7 is also provided with a controller, and the urea concentration detector 16, the recovery pump 5 and the washing pump 6 are all connected with the controller; the packing plate 14 is evenly provided with guide holes 17. The guide holes 17 are arranged in an inverted conical shape.

During specific use, the urea prilling tower discharges the gas containing urea dust into the recovery tower 1 through the air inlet 2 through the blower 9, and the urea dust with larger particles in the gas entering the recovery tower 1 settles and falls into the dust collection. In cavity 4, the remaining dust enters the washing and recovery mechanism 8 with the gas upward, and the staff controls the washing pump 6 to pump the washing liquid in the washing liquid storage tank 7 to the first-level liquid distributor 10 and the second-level liquid distributor 11, and through the cleaning liquid storage tank 7. The first-level atomizing nozzles 12 and the second-level atomizing nozzles 13 on the upper part are sprayed, and the washing liquid fully absorbs the dust in the rising gas and falls into the dust collection chamber 4 to fuse with the urea particles therein, and the packing plate 14 further absorbs and absorbs the dust. Through the guide hole 17, the dust-absorbing cleaning liquid flows into the dust collection chamber 4, and the gas that continues to rise passes through the demisting layer 15, and a small amount of dust in the mist contained therein is also removed, and then the dust-free gas passes through the exhaust. When the urea concentration detector 16 detects that the urea concentration in the dust collection chamber 4 reaches 20%, the controller makes the recovery pump 5 pump it to the urea recovery system, and the urea concentration detector 16 detects the dust collection chamber 4. When the urea concentration inside is less than 20%, the controller controls the washing pump 6 to circulate.

The present invention and the embodiments thereof have been described above, and the description is not restrictive, and what is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it, without departing from the purpose of the present invention, and without creatively designing the structural modes and embodiments similar to the technical scheme, all should belong to the protection of the present invention. scope.

Claims (5)

1. a urea granulation tower tower top dust recovery device is characterized in that: comprise recovery tower, air inlet, exhaust port, dust collection cavity, recovery pump, washing pump, washing liquid storage tank and washing recovery mechanism, so The air inlet is set at the bottom of the recovery tower, the exhaust port is set at the top of the recovery tower, the dust collection cavity is set at the bottom of the recovery tower, the upper end of the dust collection cavity is provided with an opening, and the dust collection cavity is positioned horizontally. Below the horizontal position of the air inlet, the air inlet is provided with a blower, the washing and recovery mechanism is arranged in the recovery tower and below the exhaust port, the washing pump and the washing and recovery mechanism are connected by pipes, and the washing liquid The storage tank and the washing pump are connected by pipelines, the recovery pump and the dust collection chamber are connected by pipelines, and the washing liquid storage tank is provided with washing liquid; the washing and recovery mechanism includes a primary liquid distributor and a secondary liquid distributor , a first-level atomizing nozzle, a second-level atomizing nozzle and a packing plate, the first-level liquid distributor and the second-level liquid distributor are horizontally arranged in the recovery tower, and the first-level liquid distributor is located above the second-level liquid distributor, so The first-level atomizing nozzles are evenly distributed on the first-level liquid distributor and face downward, the second-level atomizing nozzles are evenly distributed on the second-level liquid distributor and face upward, and the packing plate is arranged on the first-level liquid distributor. Between the first-level liquid distributor and the second-level liquid distributor, both the first-level liquid distributor and the second-level liquid distributor are connected with the washing pump through pipes. 2. A urea granulation tower top dust recovery device according to claim 1, characterized in that: a mist removal layer is provided above the first-level liquid distributor in the recovery tower. 3. a kind of urea granulation tower tower top dust recovery device according to claim 1, is characterized in that: described washing liquid storage tank is provided with urea concentration detector, and described washing pump passes through pipeline and washing liquid storage tank connect. 4. a kind of urea prilling tower top dust recovery device according to claim 3, is characterized in that: described washing liquid storage tank is also provided with controller, described urea concentration detector, recovery pump and washing pump are connected to the controller. 5 . A urea granulation tower top dust recovery device according to claim 1 , wherein the packing plate is evenly provided with diversion holes, and the diversion holes are arranged in an inverted conical shape. 6 .

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