CN210356632U - Liquid ammonia production is with novel tower that takes off that becomes - Google Patents

Abstract

The utility model discloses a novel variable-stripping tower for liquid ammonia production, which comprises a tower body, wherein a variable-stripping gas outlet and a desulfurization lye pump inlet are respectively fixed at the top of the tower body and on one side of the tower body close to the top, the desulfurization lye pump inlet is connected with a plurality of distribution pipes, and a plurality of lye spray heads are welded on each distribution pipe; the liquid outlet of the variable-stripping tower is fixed at the bottom of the tower body, a plurality of layers of sieve plates are fixed in the tower body, a plurality of sieve holes are formed in the sieve plates, a downcomer is connected and communicated between the adjacent upper and lower layers of sieve plates, a gas coil pipe is fixed below the lowest layer of sieve plate, a small nozzle is fixed above the top of the downcomer on each layer of sieve plate, and the small nozzles are finally converged on the same gas pipe and connected with a small pressure pump. Through the arrangement of the nozzles above each downcomer, the high-pressure gas sprayed out by the nozzles breaks up sulfur foam above the downcomers, so that the elemental sulfur foam and the desulfurization alkali liquor are kept together, accumulation and blockage on the sieve plate are avoided, and the interval time between two adjacent stoppages is effectively prolonged.

Description

Liquid ammonia production is with novel tower that takes off that becomes

Technical Field

The utility model relates to a liquid ammonia production is with novel becoming to take off tower belongs to liquid ammonia production technical equipment field.

Background

Liquid ammonia is a colorless liquid with a strong pungent odor. Ammonia is an important chemical raw material, and for convenience in transportation and storage, gaseous ammonia gas is usually pressurized or cooled to obtain liquid ammonia. The production of liquid ammonia mainly includes firstly preparing ammonia gas, then pressurizing, liquefying and bottling, its raw material gas is N₂And H₂In which N is₂Taken from the air, and H₂The preparation is mostly carried out by the water gas method, i.e. anthracite or coke is reacted with steam at high temperature (C + H2O = = CO + H2, CO + H2O = = CO2 + H2). However, in the water gas method for producing hydrogen, hydrogen sulfide gas is discharged, and hydrogen sulfide is a toxic gas, so that the environment is polluted, and the life safety of people is threatened, so that the hydrogen sulfide gas needs to be removed.

In the prior art, a wet TS (sulfur transfer) desulfurization method is generally adopted in a variable-desorption system of a synthetic ammonia plant, but the desulfurization efficiency is low and is only 60-70%, and a variable-desorption outlet H₂S exceeds the standard for a long time, the replacement period of the fine-removal activated carbon is greatly shortened, and the production cost is higher. The main reason for the low desulfurization efficiency at present is that gas and liquid are not easy to distribute uniformly, elemental sulfur foam generated by absorption mass transfer reaction on the surface of the packing is easy to accumulate on the surface of the packing, especially, the liquid level is increased due to the accumulation of the sulfur foam above a downcomer of a variable-stripping tower, so that the packing tower is blocked, the pressure of the outlet of the pump is close to 30 kilograms, and the shutdown is performed once in about two months.

Disclosure of Invention

To the not enough of above-mentioned prior art existence, the utility model aims at providing a liquid ammonia production is with novel change tower of taking off to improve and become to take off efficiency.

In order to achieve the above object, the utility model adopts the following technical scheme: the novel variable-stripping tower for producing liquid ammonia comprises a tower body and is characterized in that a variable-stripping gas outlet and a desulfurized alkali liquor pump inlet are respectively fixed at the top of the tower body and on one side of the tower body close to the top, wherein one end of the desulfurized alkali liquor pump inlet is connected with a desulfurized alkali liquor pump through a flange and a flange plate, the desulfurized alkali liquor pump inlet is in threaded connection with a plurality of distribution pipes extending to the inner top of the tower body, and a plurality of alkali liquor spray heads are welded on each distribution pipe; a liquid outlet of the variable degassing tower is fixed at the bottom of the tower body, a plurality of layers of sieve plates are fixed in the tower body according to different height positions from top to bottom, a plurality of sieve holes are formed in the sieve plates, a downcomer is connected and communicated between the adjacent upper and lower layers of sieve plates, a gas coil pipe is fixed below the lowest layer of sieve plate, a plurality of gas holes are uniformly formed in the top of the gas coil pipe, one end of the gas coil pipe is closed, the other end of the gas coil pipe extends out of the wall of the tower body and then is connected with a heating gas pump through a pipeline, and the heating gas pump is connected and communicated with a; from the top down, from the third deck sieve, be fixed with small-size nozzle above the downcomer top on every deck sieve, the fumarole of small-size nozzle faces the opening in corresponding downcomer upper end, and small-size nozzle is finally converged and is connected with small-size force (forcing) pump on the same gas-supply pipe on and this gas-supply pipe, and this gas-supply pipe is through gas hose, tee junction on becoming take off back gas outlet.

Preferably, the sieve holes on each sieve plate are designed into a conical column shape with a large top and a small bottom, the diameter of the top of each sieve hole is 10mm, the diameter of the bottom of each sieve hole is 7mm, and the sieve holes on the adjacent upper and lower layers of sieve plates are staggered.

Compared with the prior art, the utility model discloses the beneficial effect who possesses is: through the arrangement of the nozzles above each downcomer, the high-pressure gas sprayed out by the nozzles breaks up sulfur foam above the downcomers, so that elemental sulfur foam and the desulfurization alkali liquor are kept together, accumulation and blockage on the sieve plate are avoided, the interval time between two adjacent stoppages is effectively prolonged (more than four months), and the working efficiency is relatively improved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

Fig. 2 is a structural plan view of the sieve plate of the present invention.

Detailed Description

The invention will now be further elucidated with reference to the specific drawings. The following is a preferred embodiment of the present invention, but is not intended to limit the invention. Any design that promotes the downward flow of sulfur foam by breaking up the sulfur foam without departing from the scope of the present application is intended to be within the scope of the present application. In addition, the detailed parts of the utility model are the same as the conventional technology.

As shown in fig. 1 and 2, the utility model discloses a liquid ammonia production is with novel becoming tower of taking off, including tower body 1, the tower body 1 bottom supports subaerial through the welded support, tower body 1 height and capacity are according to actual production needs and decide, the welding of tower body 1 top becomes to take off back gas outlet 2, it has the tee bend to become to take off back gas outlet 2 on the screw thread connection, the expert at the top in the tee bend connects the pneumatic valve according to conventional mode, gather gas in the exit of pneumatic valve in order to detect whether discharge gas discharge up to standard discharges in actual production, the last expert of tee bend threaded connection and intercommunication have gas hose 3, this gas hose 3 and gas-supply pipe 4 (the hard tube) of fixing on the outer wall of tower body 1 adopt the staple bolt or other conventional mode to connect and communicate; a desulfurization lye pump inlet 5 is welded on one side, close to the top, of the tower body 1, one end (the end positioned outside the tower body) of the desulfurization lye pump inlet 5 is connected and communicated with the desulfurization lye pump through a flange and a flange plate, desulfurization lye is pumped out from a desulfurization lye storage tank through the desulfurization lye pump and is downwards sprayed out in the tower body 1 in a spraying mode, the other end (the end positioned in the tower body) of the desulfurization lye pump inlet 5 is in threaded connection and communicated with a distribution pipe 6 extending to the inner top of the tower body 1, a plurality of lye spray heads 7 are uniformly welded and communicated on the distribution pipe 6 (the plurality of spray heads 7 are particularly installed to basically cover the surface of the sieve plate within the spraying range), and a spray port of the lye spray heads 7 faces downwards; the bottom of the tower body 1 is welded and communicated with a variable de-tower liquid outlet 8, and a discharge valve (only a conventional liquid valve) is fixed on the variable de-tower liquid outlet 8 in a conventional manner; a plurality of layers of sieve plates 9 are fixed in the tower body 1 according to different height positions from top to bottom (namely, limiting bosses are welded at different height positions on the inner wall of the tower body 1, each layer of sieve plate 9 is placed on the corresponding limiting boss, and a screw is screwed in the inner wall of the tower body above each layer of sieve plate 9 to limit and fix the corresponding sieve plate 9), a plurality of sieve holes are arranged on the sieve plates 9, downcomers 10 are connected and communicated between the adjacent upper and lower layers of sieve plates 9, the top of each downcomer 10 is higher than the top of the corresponding upper layer of sieve plate 9 and is fixed on the upper layer of sieve plate 9 in a welding manner, and the bottom of each downcomer 10 is positioned at the height position of the top of the corresponding adjacent lower layer of sieve plate 9; a gas coil pipe 11 is fixed below the lowest layer of the sieve plate 9, a plurality of air holes are uniformly formed in the top of the gas coil pipe 11, one end of the gas coil pipe 11 is closed, the other end of the gas coil pipe extends out of the wall of the tower body 1 and then is connected and communicated with a heating air pump 12 through a pipeline in a conventional mode, the gas coil pipe 11 is supported by a cross-shaped bracket welded at a proper position in the tower body, a sealing gasket is fixed at a position where the gas coil pipe 11 is contacted with the wall of the tower body 1, the end part of the gas coil pipe 11 penetrates out of the; the heating air pump 12 is connected and communicated with a temporary storage tank 13 of the gas to be changed through a pipeline in a conventional manner; from top to bottom, starting from the third layer of sieve plates 9, a small nozzle 14 is fixed above the top of the downcomer on each layer of sieve plates 9, the gas orifice of the small nozzle 14 faces the upper end opening of the corresponding downcomer 10, the small nozzles 14 are finally converged on the same gas pipe 4 in a threaded connection mode, and the gas pipe 4 is connected with a small pressurizing pump in a conventional mode.

The sieve holes 9.1 on each sieve plate 9 are designed into a conical column shape with a large upper part and a small lower part, the diameter of the top of each sieve hole is 10mm, the diameter of the bottom of each sieve hole is 7mm, and the sieve holes on the adjacent upper and lower layers of sieve plates are staggered. In practice, no sieve mesh is designed around each sieve plate 9 and near the edge, no sieve mesh is designed in the area where the downcomer is located, no sieve mesh is designed in the symmetrical positions of the area where the downcomer is located, and sieve meshes are uniformly distributed in the rest positions so as to increase the contact time of the desulfurized alkali liquor and the gas containing hydrogen sulfide.

When the device is used, gas containing hydrogen sulfide is heated under the action of a heating pump and pumped into the gas coil pipe 11 and then is sprayed out from the air holes in the gas spray pipe 11, hot gas moves upwards, and meanwhile, desulfurized alkali liquor is sprayed downwards from the alkali liquor spray head 7 at the top and passes through the multilayer sieve plates and the downcomer, and the desulfurized alkali liquor and the gas containing hydrogen sulfide realize countercurrent contact as a whole.

Claims (2)

1. The novel variable-stripping tower for producing liquid ammonia comprises a tower body and is characterized in that a variable-stripping gas outlet and a desulfurized alkali liquor pump inlet are respectively fixed at the top of the tower body and on one side of the tower body close to the top, wherein one end of the desulfurized alkali liquor pump inlet is connected with a desulfurized alkali liquor pump through a flange and a flange plate, the desulfurized alkali liquor pump inlet is in threaded connection with a plurality of distribution pipes extending to the inner top of the tower body, and a plurality of alkali liquor spray heads are welded on each distribution pipe; a liquid outlet of the variable degassing tower is fixed at the bottom of the tower body, a plurality of layers of sieve plates are fixed in the tower body according to different height positions from top to bottom, a plurality of sieve holes are formed in the sieve plates, a downcomer is connected and communicated between the adjacent upper and lower layers of sieve plates, a gas coil pipe is fixed below the lowest layer of sieve plate, a plurality of gas holes are uniformly formed in the top of the gas coil pipe, one end of the gas coil pipe is closed, the other end of the gas coil pipe extends out of the wall of the tower body and then is connected with a heating gas pump through a pipeline, and the heating gas pump is connected and communicated with a; from the top down, from the third deck sieve, be fixed with small-size nozzle above the downcomer top on every deck sieve, the fumarole of small-size nozzle faces the opening in corresponding downcomer upper end, and small-size nozzle is finally converged and is connected with small-size force (forcing) pump on the same gas-supply pipe on and this gas-supply pipe, and this gas-supply pipe is through gas hose, tee junction on becoming take off back gas outlet.

2. The novel variable-stripping tower for producing liquid ammonia according to claim 1, wherein the sieve holes on each sieve plate are designed into a conical column shape with a large top and a small bottom, the diameter of the top of each sieve hole is 10mm, the diameter of the bottom of each sieve hole is 7mm, and the sieve holes on the adjacent sieve plates on the upper layer and the lower layer are staggered.

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