Reaction and tail ammonia treatment system

Abstract

The utility model discloses a reaction and tail ammonia treatment system which comprises an ethylene oxide storage tank, a liquid ammonia storage tank, a liquid nitrogen intermediate tank, a reactor, a catalyst collection tank, a tail ammonia absorption tower and a tail ammonia water washing tower, the top of the ethylene oxide storage tank is communicated with the tail ammonia absorption tower through a storage tank bleeding gas pipe, the bottom of the ethylene oxide storage tank is communicated with the reactor through an ethylene oxide feeding pipe, the reactor is provided with an ammonia distillation dehydration system connecting pipe communicated with the reactor, and the bottom of the liquid ammonia storage tank is communicated with the liquid nitrogen intermediate tank through a liquid ammonia transfer pipe. The bottom of the liquid nitrogen intermediate tank is communicated with the reactor through a liquid ammonia feeding pipe, a second liquid ammonia feeding pump is arranged on the liquid ammonia feeding pipe, and the liquid nitrogen intermediate tank is communicated with the tail ammonia absorption tower through an intermediate tank diffusion gas pipe. According to the tail ammonia absorption device, tail ammonia can be efficiently absorbed, the energy consumption is reduced, and the equipment structure is simplified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of reaction and tail gas treatment, specifically relates to a kind of reaction and tail ammonia treatment system. BACKGROUND

[0002] Ammonia-containing tail gas is generated in the reaction process of ethylene oxide and liquid ammonia, which can cause harm to the environment and human health if not effectively treated. The traditional tail gas treatment system has problems such as low ammonia absorption efficiency, high energy consumption, and complex equipment. Therefore, it is particularly important to develop a reaction and tail ammonia absorption system that can efficiently absorb ammonia in tail gas while reducing energy consumption and simplifying equipment. SUMMARY

[0003] The utility model aims to provide a kind of reaction and tail ammonia treatment system, which can efficiently absorb tail ammonia, reduce energy consumption and simplify equipment structure.

[0004] The utility model discloses a technical scheme adopted is: a kind of reaction and tail ammonia treatment system, including ethylene oxide storage tank, liquid ammonia storage tank, liquid nitrogen intermediate tank, reactor, catalyst collection tank, tail ammonia absorption tower and tail ammonia water washing tower, the ethylene oxide storage tank and liquid ammonia storage tank are respectively equipped with with its inside communication ethylene oxide storage pipe and liquid ammonia storage pipe, the ethylene oxide storage pipe and liquid ammonia storage pipe are respectively equipped with ethylene oxide unloading pump and liquid ammonia unloading pump, the top of ethylene oxide storage tank is communicated with tail ammonia absorption tower by storage tank diffusion gas pipe, the bottom of ethylene oxide storage tank is communicated with reactor by ethylene oxide feed pipe, the ethylene oxide feed pipe is equipped with ethylene oxide feed pump, the reactor is equipped with with its communication ammonia evaporation dehydration system connecting pipe, the bottom of liquid ammonia storage tank is communicated with liquid nitrogen intermediate tank by liquid ammonia transfer pipe, the liquid ammonia transfer pipe is equipped with first liquid ammonia feed pump, the bottom of liquid nitrogen intermediate tank is communicated with reactor by liquid ammonia feed pipe, the liquid ammonia feed pipe is equipped with second liquid ammonia feed pump, the liquid nitrogen intermediate tank is communicated with tail ammonia absorption tower by intermediate tank diffusion gas pipe, the liquid nitrogen intermediate tank is equipped with with its inside communication circulating liquid nitrogen return pipe, the catalyst collection tank is equipped with with the bottom and top of its injection liquid circulation pipe, the injection liquid circulation pipe is sequentially equipped with injection liquid circulation pump and injection cycle liquid cooler from the end close to the bottom of catalyst collection tank to the end close to the top of catalyst collection tank, the catalyst collection tank is also respectively equipped with with its inside communication incondensable gas connecting pipe, product intermediate tank connecting pipe and softening water connecting pipe, the catalyst collection tank is communicated with tail ammonia absorption tower by overflow pipe, the tail ammonia absorption tower and tail ammonia water washing tower are interconnected, the tail ammonia absorption tower is also equipped with with its inside communication total diffuser connecting pipe and dehydration backflow connecting pipe, the tail ammonia absorption tower is communicated with reactor by catalyst feed pipe, the catalyst feed pipe is equipped with catalyst feed pump, the tail ammonia absorption tower is equipped with with the top and bottom of its absorption tower circulation pipe, the absorption tower circulation pipe is sequentially equipped with absorption tower circulation pump and absorption tower bottom cycle liquid cooler on the absorption tower circulation pipe along tail ammonia circulation flow direction, the tail ammonia absorption tower is communicated with softening water connecting pipe by first connecting pipe, the tail ammonia water washing tower is equipped with with the top and bottom of its washing liquid circulation pipe, the washing liquid circulation pipe is equipped with washing liquid circulation pump, the washing liquid circulation pipe is equipped with with its inside communication blowdown water pipe.

[0005] In one embodiment, the reactor is a plurality of reactors, and the plurality of reactors are sequentially connected.

[0006] In one embodiment, at least one of the reactors is provided with a mixer at the front end.

[0007] The utility model has the advantages that:

[0008] 1. By setting the tail ammonia absorption tower and tail ammonia water washing tower, the ammonia gas in the tail gas is efficiently absorbed and washed, and the tail gas treatment efficiency is improved.

[0009] 2、By setting a plurality of reactors in turn, the continuous reaction is realized, and the production efficiency is improved.

[0010] 3、By setting a mixer at the front end of the reactor, the uniform mixing of ethylene oxide and liquid ammonia is ensured, and the reaction efficiency is improved.

[0011] 4、By setting the circulating structure of the spray liquid circulating pipe, the absorption tower circulating pipe and the water washing liquid circulating pipe, the treatment cost is reduced, and the utilization rate of the equipment is improved.

[0012] 5、By setting the softening water connecting pipe and the sewage pipe and other structures, the effective management and discharge of the liquid in the system are realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] In the figure: 1, ethylene oxide storage tank; 2, liquid ammonia storage tank; 3, liquid nitrogen intermediate tank; 4, reactor; 5, catalyst collection tank; 6, tail ammonia absorption tower; 7, tail ammonia water washing tower; 8, ethylene oxide feed pipe; 9, liquid ammonia feed pipe; 10, ethylene oxide unloading pump; 11, liquid ammonia unloading pump; 12, storage tank diffusion gas pipe; 13, ethylene oxide feed pipe; 14, ethylene oxide feed pump; 15, ammonia vapor dehydration system connecting pipe; 16, liquid ammonia transfer pipe; 17, liquid ammonia feed pipe; 18, second liquid ammonia feed pump; 19, intermediate tank diffusion gas pipe; 20, circulating liquid nitrogen return pipe; 21, spray liquid circulating pipe; 22, spray liquid circulating pump; 23, spray circulating liquid cooler; 24, non-condensable gas connecting pipe; 25, product intermediate tank connecting pipe; 26, softening water connecting pipe; 27, overflow pipe communication; 28, total diffuser connecting pipe; 29, dehydration reflux connecting pipe; 30, catalyst feed pipe; 31, catalyst feed pump; 32, absorption tower circulating pipe; 33, absorption tower circulating pump; 34, absorption tower bottom circulating liquid cooler; 35, first connecting pipe; 36, water washing liquid circulating pipe; 37, water washing liquid circulating pump; 38, sewage pipe; 39, mixer; 40, DETAILED DESCRIPTION

[0015] The utility model will be combined with specific embodiments and the drawings for further detailed description.

[0016] As Figure 1As shown, a reaction and tail ammonia treatment system comprises an ethylene oxide storage tank 1, a liquid ammonia storage tank 2, a liquid nitrogen intermediate tank 3, a reactor 4, a catalyst collection tank 5, a tail ammonia absorption tower 6 and a tail ammonia water washing tower 7, the ethylene oxide storage tank 1 and the liquid ammonia storage tank 2 are respectively provided with ethylene oxide storage pipes 8 and liquid ammonia storage pipes 9 which are in communication with the interiors of the ethylene oxide storage tank 1 and the liquid ammonia storage tank 2, the ethylene oxide storage pipes 8 and the liquid ammonia storage pipes 9 are respectively provided with ethylene oxide unloading pumps 10 and liquid ammonia unloading pumps 11, the top of the ethylene oxide storage tank 1 is communicated with the tail ammonia absorption tower 6 through a storage tank emission gas pipe 12, the bottom of the ethylene oxide storage tank 1 is communicated with the reactor 4 through an ethylene oxide feeding pipe 13, the ethylene oxide feeding pipe 13 is provided with an ethylene oxide feeding pump 14, the reactor 4 is provided with a connection pipe 15 of an ammonia evaporation and dehydration system which is in communication with the reactor 4, the bottom of the liquid ammonia storage tank 2 is communicated with the liquid nitrogen intermediate tank 3 through a liquid ammonia transfer pipe 16, the liquid ammonia transfer pipe 16 is provided with a first liquid ammonia feeding pump 40, the bottom of the liquid nitrogen intermediate tank 3 is communicated with the reactor 4 through a liquid ammonia feeding pipe 17, the liquid ammonia feeding pipe 17 is provided with a second liquid ammonia feeding pump 18, the liquid nitrogen intermediate tank 3 is communicated with the tail ammonia absorption tower 6 through an intermediate tank emission gas pipe 19, the liquid nitrogen intermediate tank 3 is provided with a circulating liquid nitrogen return pipe 20 which is in communication with the interior of the liquid nitrogen intermediate tank 3, the catalyst collection tank 5 is provided with a spraying liquid circulation pipe 21 which is communicated with the bottom and the top of the catalyst collection tank 5, the spraying liquid circulation pipe 21 is sequentially provided with a spraying liquid circulation pump 22 and a spraying circulation liquid cooler 23 from one end close to the bottom of the catalyst collection tank 5 to one end close to the top of the catalyst collection tank 5, the catalyst collection tank 5 is further respectively provided with a non-condensable gas connection pipe 24, a product intermediate tank connection pipe 25 and a softened water connection pipe 26 which are in communication with the interior of the catalyst collection tank 5, the catalyst collection tank 5 is communicated with the tail ammonia absorption tower 6 through an overflow pipe 27, the tail ammonia absorption tower 6 and the tail ammonia water washing tower 7 are communicated with each other, the tail ammonia absorption tower 6 is further provided with a total emission device connection pipe 28 and a dehydration backflow connection pipe 29 which are in communication with the interior of the tail ammonia absorption tower 6, the tail ammonia absorption tower 6 is communicated with the reactor 4 through a catalyst feeding pipe 30, the catalyst feeding pipe 30 is provided with a catalyst feeding pump 31, the tail ammonia absorption tower 6 is provided with an absorption tower circulation pipe 32 which is communicated with the top and the bottom of the tail ammonia absorption tower 6, the absorption tower circulation pipe 32 is sequentially provided with an absorption tower circulation pump 33 and an absorption tower bottom circulation liquid cooler 34 along the tail ammonia circulation flow direction, the tail ammonia absorption tower 6 is communicated with the softened water connection pipe 26 through a first connection pipe 35, the tail ammonia water washing tower 7 is provided with a water washing liquid circulation pipe 36 which is communicated with the top and the bottom of the tail ammonia water washing tower 7, the water washing liquid circulation pipe 36 is provided with a water washing liquid circulation pump 37, the water washing liquid circulation pipe 36 is provided with a blowdown water pipe 38 which is in communication with the interior of the water washing liquid circulation pipe 36.

[0017] In the embodiment, the reactor 4 is a plurality of reactors, and the plurality of reactors are sequentially communicated.

[0018] In the embodiment, at least one front end of the reactor 4 is provided with a mixer 39.

[0019] In the system, the ethylene oxide storage tank 1 and the liquid ammonia storage tank 2 are respectively provided with an ethylene oxide feeding pipe 138 and a liquid ammonia feeding pipe 179 which are in communication with the interiors of the ethylene oxide storage tank 1 and the liquid ammonia storage tank 2, and the ethylene oxide feeding pipe 138 and the liquid ammonia feeding pipe 179 are respectively provided with an ethylene oxide unloading pump 10 and a liquid ammonia unloading pump 11 for pumping ethylene oxide and liquid ammonia into the storage tanks respectively.

[0020] The top of the ethylene oxide storage tank 1 is communicated with the tail ammonia absorption tower 6 through a storage tank emission gas pipe 12 for introducing the tail gas generated in the ethylene oxide storage tank 1 into the tail ammonia absorption tower 6 for treatment. The bottom of the ethylene oxide storage tank 1 is communicated with the reactor 4 through the ethylene oxide feeding pipe 138, and the ethylene oxide feeding pipe 138 is provided with an ethylene oxide feeding pump 14 for pumping ethylene oxide into the reactor 4.

[0021] The reactor 4 is a plurality of reactors which are communicated in sequence to realize continuous reaction. At least one of the reactors 4 is provided with a mixer 39 at the front end for mixing ethylene oxide and liquid ammonia uniformly before entering the reactor 4 for reaction.

[0022] The reactor 4 is provided with a connection pipe 15 of the ammonia evaporation and dehydration system which is in communication with the reactor 4 for separating the ammonia gas and water generated in the reactor 4.

[0023] The bottom of the liquid ammonia storage tank 2 is communicated with the liquid nitrogen intermediate tank 3 through a liquid ammonia transfer pipe 16, the bottom of the liquid nitrogen intermediate tank 3 is communicated with the reactor 4 through a liquid ammonia feeding pipe 179, the liquid ammonia feeding pipe 179 is provided with a second liquid ammonia feeding pump 18 for pumping liquid ammonia into the reactor 4. The liquid nitrogen intermediate tank 3 is communicated with the tail ammonia absorption tower 6 through an intermediate tank emission gas pipe 19 for introducing the tail gas generated in the liquid nitrogen intermediate tank 3 into the tail ammonia absorption tower 6 for treatment. The liquid nitrogen intermediate tank 3 is also provided with a circulating liquid nitrogen return pipe 20 which is in communication with the interior of the liquid nitrogen intermediate tank 3 for returning the unused liquid nitrogen into the liquid nitrogen intermediate tank 3.

[0024] The catalyst collecting tank 5 is provided with a spraying liquid circulating pipe 21 which is communicated with the bottom and the top of the catalyst collecting tank 5, and the spraying liquid circulating pipe 21 is provided with a spraying liquid circulating pump 22 and a spraying circulating liquid cooler 23 in sequence from one end close to the bottom of the catalyst collecting tank 5 to one end close to the top of the catalyst collecting tank 5 for cooling and circulating the catalyst. The catalyst collecting tank 5 is also provided with a non-condensable gas connection pipe 24, a product intermediate tank connection pipe 25 and a softened water connection pipe 26 which are in communication with the interior of the catalyst collecting tank 5 respectively. The catalyst collecting tank 5 is communicated with the tail ammonia absorption tower 6 through an overflow pipe 27 for introducing the excess liquid in the catalyst collecting tank 5 into the tail ammonia absorption tower 6 for treatment.

[0025] The tail ammonia absorption tower 6 and the tail ammonia water washing tower 7 are communicated with each other, and are used for absorbing and washing the ammonia gas in the tail gas. The tail ammonia absorption tower 6 is further provided with a total diffuser connecting pipe 28 and a dehydration reflux connecting pipe 29 which are communicated with the inside of the tail ammonia absorption tower 6, and are used for discharging and refluxing the processed tail gas and the unabsorbed ammonia gas. The tail ammonia absorption tower 6 is communicated with the reactor 4 through a catalyst feeding pipe 30, and the catalyst feeding pipe 30 is provided with a catalyst feeding pump 31 which is used for pumping the catalyst into the reactor 4. The tail ammonia absorption tower 6 is provided with a tail ammonia absorption tower 6 circulating pipe which is communicated with the top and the bottom of the tail ammonia absorption tower 6, and the tail ammonia absorption tower 6 circulating pipe is provided with a tail ammonia absorption tower 6 circulating pump and an absorption tower bottom circulating liquid cooler 34 in sequence along the tail ammonia circulating flow direction, and is used for circulating and cooling the liquid in the tail ammonia absorption tower 6. The tail ammonia absorption tower 6 is communicated with the softened water connecting pipe 26 through a first connecting pipe 35, and is used for supplementing the softened water into the tail ammonia absorption tower 6.

[0026] The tail ammonia water washing tower 7 is provided with a washing liquid circulating pipe 36 which is communicated with the top and the bottom of the tail ammonia water washing tower 7, and the washing liquid circulating pipe 36 is provided with a washing liquid circulating pump 37 which is used for circulating the washing liquid. The washing liquid circulating pipe 36 is further provided with a sewage pipe 38 which is communicated with the inside of the washing liquid circulating pipe 36, and is used for discharging the processed sewage.

[0027] The above-mentioned embodiments only express the specific implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that, for the ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and these all belong to the protection scope of the present application.

Claims

1. A reaction and tail gas ammonia treatment system, characterized by: The utility model relates to a kind of ammonia production system, including ethylene oxide storage tank (1), liquid ammonia storage tank (2), liquid nitrogen intermediate tank (3), reactor (4), catalyst collection tank (5), tail ammonia absorption tower (6) and tail ammonia water washing tower (7), the ethylene oxide storage tank (1) and liquid ammonia storage tank (2) are equipped with ethylene oxide storage pipe (8) and liquid ammonia storage pipe (9) respectively with its inside communication, the ethylene oxide storage pipe (8) and liquid ammonia storage pipe (9) are equipped with ethylene oxide unloading pump (10) and liquid ammonia unloading pump (11) respectively, the ethylene oxide storage tank (1) top is communicated with tail ammonia absorption tower (6) by storage tank emission gas pipe (12), the ethylene oxide storage tank (1) bottom is communicated with reactor (4) by ethylene oxide feed pipe (13), the ethylene oxide feed pipe (13) is equipped with ethylene oxide feed pump (14), the reactor (4) is equipped with with its communication ammonia stripping dehydration system connecting pipe (15), the liquid ammonia storage tank (2) bottom is communicated with liquid nitrogen intermediate tank (3) by liquid ammonia transfer pipe (16), the liquid ammonia transfer pipe (16) is equipped with first liquid ammonia feed pump (40), the liquid nitrogen intermediate tank (3) bottom is communicated with reactor (4) by liquid ammonia feed pipe (17), the liquid ammonia feed pipe (17) is equipped with second liquid ammonia feed pump (18), the liquid nitrogen intermediate tank (3) is communicated with tail ammonia absorption tower (6) by intermediate tank emission gas pipe (19), the liquid nitrogen intermediate tank (3) is equipped with with its inside communication circulating liquid nitrogen return pipe (20), the catalyst collection tank (5) is equipped with with the bottom and top of its communication injection liquid circulation pipe (21), the injection liquid circulation pipe (21) is sequentially equipped with injection liquid circulation pump (22) and injection cycle liquid cooler (23) from the end close to the bottom of catalyst collection tank (5) to the end close to the top of catalyst collection tank (5), the catalyst collection tank (5) is also respectively equipped with with its inside communication non-condensable gas connecting pipe (24), product intermediate tank connecting pipe (25) and softening water connecting pipe (26), the catalyst collection tank (5) is communicated with tail ammonia absorption tower (6) by overflow pipe (27), the tail ammonia absorption tower (6) and tail ammonia water washing tower (7) are communicated, the tail ammonia absorption tower (6) is also equipped with with its inside communication total diffuser connecting pipe (28) and dehydration backflow connecting pipe (29), the tail ammonia absorption tower (6) is communicated with reactor (4) by catalyst feed pipe (30), the catalyst feed pipe (30) is equipped with catalyst feed pump (31), the tail ammonia absorption tower (6) is equipped with with the top and bottom of its communication absorption tower circulation pipe (32), the absorption tower circulation pipe (32) is sequentially equipped with absorption tower circulation pump (33) and absorption tower bottom cycle liquid cooler (34) along the tail ammonia circulation flow direction, the tail ammonia absorption tower (6) is communicated with softening water connecting pipe (26) by first connecting pipe (35), the tail ammonia water washing tower (7) is equipped with with the top and bottom of its communication washing liquid circulation pipe (36), the washing liquid circulation pipe (36) is equipped with washing liquid circulation pump (37),The water washing liquid circulating pipe (36) is provided with a sewage pipe (38) communicated with the inside thereof.

2. A reaction and tail gas treatment system according to claim 1, characterized in that: The reactor (4) is a plurality of reactors (4) which are sequentially communicated.

3. A reaction and tail gas treatment system according to claim 2, characterized in that: At least one of the reactors (4) is provided with a mixer (39) at the front end.

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