CN217829544U - High-efficient ammonia resource recovery processing system - Google Patents
High-efficient ammonia resource recovery processing system Download PDFInfo
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- CN217829544U CN217829544U CN202221799067.2U CN202221799067U CN217829544U CN 217829544 U CN217829544 U CN 217829544U CN 202221799067 U CN202221799067 U CN 202221799067U CN 217829544 U CN217829544 U CN 217829544U
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Abstract
The utility model discloses a high-efficiency ammonia resource recovery processing system, which belongs to the technical field of ammonia-containing gas and synthesis gas deamination, and comprises an ammonia absorption tower, wherein the outer wall of the lower section of the ammonia absorption tower is provided with an ammonia-containing gas inlet pipe, and the top of the ammonia absorption tower is provided with an ammonia absorption rear gas discharge pipe; an ammonium phosphate liquid supply tank is arranged below the air inlet side of the ammonia absorption tower, and a liquid outlet pipeline is arranged at the bottom of the other side of the ammonia absorption tower; a branch pipeline of the liquid outlet pipeline is communicated with the middle part of the outer wall of the ammonia absorption tower, and an ammonia absorption circulating pump and an ammonia absorption circulating condenser are sequentially arranged on the branch pipeline; the other branch pipe is sequentially connected with a rich liquid pump, an ammonium phosphate rich liquid filter, a lean rich liquid heat exchanger and a deacidification device; rich liquid in the deacidification device is fed from the outer wall of the desorption tower close to the top through a desorption tower feed pump and a desorption tower cooler; the rich liquid heat exchanger and the barren solution cooler in the desorption tower are communicated with the ammonia absorption tower; and cooling the ammonia steam by a desorption tower cooler and then storing the ammonia water in an intermediate storage tank. The treatment process is environment-friendly and pollution-free, and can provide reliable guarantee for the production of high-quality ammonia water and liquid ammonia products in the subsequent process.
Description
The technical field is as follows:
the utility model relates to an contain ammonia gas, synthetic gas deamination technical field, specifically be a high-efficient ammonia resourceful recovery processing system.
Background art:
for the coal chemical industry and the coking industry, NH3 contained in the process gas is harmful, on one hand, equipment is seriously corroded, the requirement on equipment materials is greatly improved, the investment cost is increased, on the other hand, the downstream process is polluted, so that the NH3 needs to be removed to achieve the aim of pretreatment and purification, and meanwhile, ammonia water or anhydrous ammonia of a product grade obtained through efficient recovery is also an important chemical raw material to achieve the conversion of changing waste into valuable.
The technology for recovering ammonia from coal gas and synthesis gas by deammoniation and resource recycling is a new development direction, at present, ammonia is removed in more domestic processes, such as crude ammonia water prepared by water washing or ammonium sulfate prepared by a sulfuric acid ammonia absorption method, the additional values of the crude ammonia water and the ammonium sulfate are low, the crude ammonia water is further refined to prepare high-quality ammonia water or liquid ammonia, multi-stage separation, desulfurization and decarburization are also needed, and the investment cost is high. Under the condition, the research on the system for removing and purifying the ammonia-containing gas and efficiently recovering the ammonia has important practical significance.
The utility model has the following contents:
in order to compensate the not enough of prior art problem, the utility model aims at providing a high-efficient ammonia resource recovery processing system mainly contains ammonia gas or synthetic gas to coal gas industry and coal chemical industry and gets into ammonium phosphate washing absorption system, and the ammonium phosphate rich solution that has absorbed ammonia is discharged from the absorption tower bottom and is through the deacidification, and the ammonia desorption tower system on next step is got to the recuperation, releases high-purity ammonia, realizes the resource recovery of ammonia.
The technical scheme of the utility model as follows:
an efficient ammonia resource recovery treatment system comprises an ammonia absorption tower, wherein the outer wall of the lower section of the ammonia absorption tower is provided with an ammonia-containing gas inlet pipe, and the top of the ammonia absorption tower is provided with an ammonia-absorbed gas outlet pipe; an ammonium phosphate liquid supply tank is arranged below the air inlet side of the ammonia absorption tower, and a liquid outlet pipeline is arranged at the bottom of the other side of the ammonia absorption tower; it is characterized in that the preparation method is characterized in that,
the liquid outlet pipeline is divided into two branch pipelines, wherein one branch pipeline is communicated with the middle part of the outer wall of the ammonia absorption tower, and an ammonia absorption circulating pump and an ammonia absorption circulating condenser are sequentially arranged on the branch pipeline; the other branch pipe is sequentially connected with a rich liquid pump, an ammonium phosphate rich liquid filter, a lean rich liquid heat exchanger and a deacidification device;
rich liquid in the deacidification device is fed from the outer wall of the desorption tower close to the top through a desorption tower feeding pump and a desorption tower cooler; a steam inlet pipeline is arranged on one side of the desorption tower close to the bottom, a barren solution pipeline is arranged on the other side of the desorption tower close to the bottom, and the barren solution pipeline is communicated with the side wall of the ammonia absorption tower close to the top through a barren and rich solution heat exchanger and a barren solution cooler;
and the ammonia steam evaporated from the top of the desorption tower automatically flows into an ammonia water intermediate storage tank from an outlet at the lower end after being cooled by a desorption tower cooler, and is sent to an outdoor ammonia water storage tank after being cooled.
The high-efficiency ammonia resource recycling system is characterized in that: the gas inlet pipe is provided with a separator for purifying and separating ammonia gas.
The high-efficiency ammonia resource recycling system is characterized in that: the top of the deacidification device is provided with an exhaust pipeline which is communicated with an air inlet pipe containing ammonia gas through a pipeline, and a steam heater is arranged in the deacidification device.
The high-efficiency ammonia resource recycling system is characterized in that: and a gas return pipeline is arranged on the ammonia water intermediate storage tank, and an exhaust pipeline is arranged on the gas return pipeline and the top of the deacidification device to converge an air inlet pipe containing ammonia gas.
The high-efficiency ammonia resource recycling system is characterized in that: the ammonia absorption tower is a multi-stage air-jet tower, an annular groove is arranged on the inner wall of the lower section of the tower body at each stage, a cap-shaped gas homogenizing cover is arranged above a baffle plate of an inner ring of the annular groove, a gap is arranged between the gas homogenizing cover and the upper end surface of the baffle plate of the inner ring, the projection area of the gas homogenizing cover is larger than that of the inner ring of the annular groove, and diversion grooves are uniformly distributed on the outer wall of the gas homogenizing cover.
The high-efficiency ammonia resource recycling system is characterized in that: the inner wall of each stage of tower body is provided with a longitudinal return pipe, the upper end of the return pipe is communicated with a corresponding annular groove, the lower end of the return pipe is open, and the positions of the upper and lower return pipes are staggered.
The high-efficiency ammonia resource recycling system is characterized in that: every stage of tower body in be equipped with annular spraying pipe and radial spray pipe, annular spraying pipe is linked together with radial spray pipe, the UNICOM department is linked together with the feed liquor pipeline that gets into the tower body outer wall and correspond.
The utility model has the advantages that:
1. the utility model discloses the ammonium phosphate solution is in wherein closed circulation use, and the ammonium phosphate is non-volatile, and only a small amount of liquid smugglies secretly, and the bulk loss is little, only needs a small amount of supplements in the actual production, does not have the useless solid production of new waste water waste gas.
2. The utility model adds the coal gas purifying filter on the air inlet pipe, and the obtained clean coal gas containing ammonia enters the ammonia absorption tower; the ammonium phosphate rich solution filter is additionally arranged on a pipeline before entering the deacidification device, so that the purity of the ammonia water is improved, the subsequent deacidification amount is reduced, the energy consumption is reduced, and the service life of the absorption tower is further prolonged.
3. The utility model discloses the design of absorption tower common use multistage empty spray column is through addding annular shower and radial shower to the even gas hood of cooperation effectively solves solid crystallization and dust scheduling problem and to general packed tower, the jam influence of plate tower improves absorption efficiency, operating duration.
4. The utility model discloses increase ammonia absorption circulative cooling ware, make and be favorable to handling high temperature coal gas, spray the absorption through continuous circulation absorption liquid to take away the heat that produces, further improve the ammonia absorption rate of absorption tower, can reach 99.9wt% according to detecting.
5. The absorbent ammonium phosphate solution absorbs NH3 and is selective chemical absorption, and the reaction rate is high; the ammonium phosphate solution is acidic, has strong selectivity to NH3, hardly absorbs other acidic gases such as CO2 and H2S in the coal gas, is treated by the system, has high NH3 absorption efficiency, and the obtained ammonia water or anhydrous ammonia does not need the carbon dioxide removal and desulfurization process of the conventional stripping method.
6. The utility model discloses it reaches more than 99% to handle the desorption rate that contains ammonia gas, realizes the requirement of environmental protection technology project on the one hand, and on the other hand can provide reliable assurance for the production that follow-up technology realized high-quality aqueous ammonia and liquid ammonia product.
Description of the drawings:
fig. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic view of the ammonia absorption tower of the present invention.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
A high-efficiency ammonia resource recovery treatment system comprises an ammonia absorption tower 1, wherein the outer wall of the lower section of the ammonia absorption tower 1 is provided with an ammonia-containing gas inlet pipe 2, and the top of the ammonia absorption tower is provided with an ammonia-absorbed gas outlet pipe 4; an ammonium phosphate liquid supply tank 5 is arranged below the air inlet side of the ammonia absorption tower 1, an ammonium phosphate solution liquid supply pump for supplying absorption liquid to the ammonia absorption tower 1 is arranged in the ammonium phosphate liquid supply tank 5, and a liquid outlet pipeline is arranged at the bottom of the other side of the ammonium phosphate liquid supply tank;
the liquid outlet pipeline is divided into two branch pipelines, wherein one branch pipeline is communicated with the middle part of the outer wall of the ammonia absorption tower 1, and an ammonia absorption circulating pump 6 and an ammonia absorption circulating condenser 7 are sequentially arranged on the branch pipeline; the other branch pipe is sequentially connected with a rich liquid pump 8, an ammonium phosphate rich liquid filter 9, a lean rich liquid heat exchanger 10 and a deacidification device 11;
rich liquid in the deacidification device 11 is fed from the outer wall of the desorption tower 14 close to the top through a desorption tower feeding pump 12 and a desorption tower cooler 13; a steam inlet pipeline 15 is arranged on one side of the desorption tower 12 close to the bottom, a barren solution pipeline 16 is arranged on the other side of the desorption tower 12 close to the bottom, and the barren solution pipeline 16 is communicated with the side wall of the ammonia absorption tower 1 close to the top through a barren and rich solution heat exchanger 10 and a barren solution cooler 17;
the ammonia vapor evaporated from the top of the desorption tower 14 automatically flows into an ammonia intermediate storage tank 18 from a lower outlet after being cooled by the desorption tower cooler 13, and is sent to an outdoor ammonia storage tank (not shown in the figure) after being cooled.
The gas inlet pipe 2 is provided with a separator 3 for purifying and separating ammonia gas, and a gas-liquid separator is adopted.
The top of the deacidification device 11 is provided with an exhaust pipeline 19, the exhaust pipeline 19 is communicated with an air inlet pipe 2 containing ammonia gas through a pipeline, and a steam heater is arranged in the deacidification device.
An air return pipeline 20 is arranged on the ammonia water intermediate storage tank 18, and the air return pipeline 20 and the top of the deacidification device are provided with an exhaust pipeline 19 which are merged into the air inlet pipe 2 containing ammonia gas.
The ammonia absorption tower is a multi-stage air-jet tower, a ring groove 1-2 is arranged on the inner wall of the lower section in each stage of tower body 1-1, a cap-shaped gas homogenizing cover 1-3 is arranged at the upper end of a baffle plate of an inner ring of the ring groove, a gap is arranged between the gas homogenizing cover 1-3 and the upper end surface of the baffle plate of the inner ring, the projection area of the gas homogenizing cover 1-3 is larger than that of the inner ring of the ring groove, diversion grooves (not shown in the figure) are uniformly distributed on the inner wall and the outer wall of the gas homogenizing cover 1-3, absorption liquid on the top surface of the gas homogenizing cover enters the ring groove along with the diversion grooves, and the diversion grooves are strip-shaped grooves from the top of the gas homogenizing cover to the bottom edge.
The inner wall of each stage of the tower body is provided with a longitudinal return pipe 1-4, the upper end of the return pipe 1-4 is communicated with a corresponding annular groove 1-2, the lower end of the return pipe 1-4 is open, the positions of the return pipes 1-4 of the upper stage and the lower stage are staggered, absorption liquid in the annular groove 1-2 enters the annular groove of the next stage through a guide pipe, and finally the absorption liquid in the annular groove falls into the bottom of the tower body 1-1.
An annular spray pipe 1-5 and a radial spray pipe 1-6 are arranged in each stage of tower body, the annular spray pipe 1-5 is communicated with the radial spray pipe 1-6, and the communicated part is communicated with a liquid inlet pipeline corresponding to the outer wall of the tower body.
The utility model discloses the concrete theory of operation of recovery processing system as follows:
the utility model discloses ammonia recovery process is accomplished by absorption-desorption two steps, and the gas-liquid separator 3 before the first intake pipe of absorption tower 1 that contains ammonia gas (coal gas or synthetic gas) that comes from the desulfurization unit obtains cleaner ammonia gas that contains and gets into ammonia absorption tower 1, from bottom to top respectively with phosphorus ammonium circulating solution and phosphorus ammonium barren solution direct countercurrent contact in the tower, and ammonia is absorbed by phosphorus ammonium solution. The gas leaving the absorption column 1 is sent to a sulphur recovery unit via a gas discharge pipe 4.
And (3) ammonia recycling process:
after entering the upper section of the absorption tower for spraying, the ammonium phosphate lean solution from the lean solution cooler 17 is converged with the lower section ammonium phosphate circulating solution to absorb ammonia in the stripping gas; the tower bottom circulating solution is pumped out by a circulating pump of the absorption tower, cooled and sent back to the lower section of the absorption tower to circularly spray and absorb ammonia in the stripping gas.
Ammonia desorption process:
the rich ammonium phosphate solution at the bottom of the absorption tower is pumped by a rich solution pump 8, passes through an ammonium phosphate filter 9, is sent to a lean rich solution heat exchanger 10, is heated by the lean ammonium phosphate solution from a desorption tower 14, and then enters a deacidification device 11. Ammonia, water vapor and acidic components (CO 2, H2S and the like) flashed out from the deacidifier 11 are discharged from the top and returned to the inlet pipe 2 containing ammonia gas in front of the absorption tower. The deacidifying device 11 is provided with a steam heater, and when the temperature of the rich solution does not meet the deacidifying requirement, steam can be introduced to indirectly heat the rich solution so as to ensure the deacidifying effect. The rich solution in the deacidification device 11 is fed into the upper section of a desorption tower cooler 13 by a feeding pump of a desorption tower 14, is heated by ammonia gas from the desorption tower 14 and then enters the upper part of the desorption tower to be in countercurrent contact with ascending gas in the tower for desorption. The barren solution at the bottom of the desorption tower 14 passes through a barren and rich solution heat exchanger 10 and a barren solution cooler 17, exchanges heat with the rich solution and is cooled by circulating cooling water respectively, and then enters the upper part of the absorption tower 1 for spraying.
The ammonia vapor evaporated from the top of the desorption tower 14 exchanges heat with the rich liquid and is condensed and cooled by cooling water in the upper section of the desorption tower cooler and the lower section of the desorption tower cooler respectively, and then flows into an ammonia water intermediate tank 18 automatically to form ammonia water in a bubble point state, and the ammonia water is cooled and then sent to an external ammonia water storage tank (not shown in the figure).
Phosphoric acid is selectively absorbed by ammonia throughout the treatment system, thereby producing anhydrous ammonia of high purity. Three hydrogen atoms of the phosphoric acid are gradually replaced by ammonia ions in the aqueous solution to form firm (NH 4) 2HPO4 under the normal temperature condition, and the (NH 4) 2HPO4 can release ammonia molecules under the high temperature condition. The basic chemistry:
1) Ammonia absorption: NH3+ NH4H2PO4 → (NH 4) 2HPO4
2) Ammonia desorption: (NH 4) 2HPO4 → NH3+ NH4H2PO4
The specific description is as follows: the ammonia-containing gas from the conversion gas of coke oven gas or synthesis gas is passed through a separator to remove some tar and dust, then fed into the bottom of ammonia absorption tower, and counter-currently contacted with monoammonium phosphate solution sprayed from the top of the absorption tower, the ammonia NH3 in the gas is reacted and absorbed by monoammonium phosphate to produce diammonium phosphate, the ammonium phosphate solution which has absorbed NH3, i.e. ammonium phosphate rich liquor, is finely filtered, then is pumped out from the bottom of the absorption tower, and is heat-exchanged with the ammonium phosphate lean liquor desorbed from downstream, and is heated and deacidified, and then is further heated by a condenser at the top of the desorption tower, and fed into the tower from the top of the desorption tower, and is counter-currently contacted with the hot steam which is risen from the bottom of the desorption tower, and is heated and decomposed to release NH3, and the ammonium phosphate in the rich liquor decomposes into NH3 and becomes monoammonium phosphate in the lean liquor. The barren solution returns to the upstream absorption tower for recycling. High-purity ammonia gas desorbed from the desorption tower is condensed by a top condenser to prepare ammonia water.
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 alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An efficient ammonia resource recovery treatment system comprises an ammonia absorption tower, wherein the outer wall of the lower section of the ammonia absorption tower is provided with an ammonia-containing gas inlet pipe, and the top of the ammonia absorption tower is provided with an ammonia-absorbed gas outlet pipe; an ammonium phosphate liquid supply tank is arranged below the air inlet side of the ammonia absorption tower, and a liquid outlet pipeline is arranged at the bottom of the other side of the ammonia absorption tower; it is characterized in that the preparation method is characterized in that,
the liquid outlet pipeline is divided into two branch pipelines, wherein one branch pipeline is communicated with the middle part of the outer wall of the ammonia absorption tower, and an ammonia absorption circulating pump and an ammonia absorption circulating condenser are sequentially arranged on the branch pipeline; the other branch pipe is sequentially connected with a rich liquid pump, an ammonium phosphate rich liquid filter, a lean rich liquid heat exchanger and a deacidification device;
rich liquid in the deacidification device is fed from the outer wall of the desorption tower close to the top through a desorption tower feeding pump and a desorption tower cooler; a steam inlet pipeline is arranged on one side of the desorption tower close to the bottom, a barren liquor pipeline is arranged on the other side of the desorption tower close to the bottom, and the barren liquor pipeline is communicated with the side wall of the ammonia absorption tower close to the top through a barren and rich liquor heat exchanger and a barren liquor cooler;
and the ammonia steam evaporated from the top of the desorption tower automatically flows into an ammonia water intermediate storage tank from an outlet at the lower end after being cooled by a desorption tower cooler, and is sent to an outdoor ammonia water storage tank after being cooled.
2. The high-efficiency ammonia resource recovery processing system according to claim 1, characterized in that: the gas inlet pipe is provided with a separator for purifying and separating ammonia gas.
3. The high-efficiency ammonia resource recovery processing system according to claim 1, characterized in that: the top of the deacidification device is provided with an exhaust pipeline which is communicated with an air inlet pipe containing ammonia gas through a pipeline, and a steam heater is arranged in the deacidification device.
4. The high-efficiency ammonia resource recovery processing system according to claim 1, characterized in that: and a gas return pipeline is arranged on the ammonia water intermediate storage tank, and an exhaust pipeline is arranged on the gas return pipeline and the top of the deacidification device to converge an air inlet pipe containing ammonia gas.
5. The high-efficiency ammonia resource recovery processing system according to claim 1, characterized in that: the ammonia absorption tower is a multi-stage air-jet tower, an annular groove is arranged on the inner wall of the lower section of the tower body at each stage, a cap-shaped gas homogenizing cover is arranged above a baffle plate of an inner ring of the annular groove, a gap is arranged between the gas homogenizing cover and the upper end surface of the baffle plate of the inner ring, the projection area of the gas homogenizing cover is larger than that of the inner ring of the annular groove, and diversion grooves are uniformly distributed on the outer wall of the gas homogenizing cover.
6. The high-efficiency ammonia resource recovery processing system according to claim 5, characterized in that: the inner wall of each stage of tower body is provided with a longitudinal return pipe, the upper end of the return pipe is communicated with the corresponding annular groove, the lower end of the return pipe is open, and the positions of the return pipes at the upper stage and the lower stage are staggered.
7. The system for recycling and treating ammonia as a resource as claimed in claim 5, wherein: each stage of tower body is internally provided with an annular spraying pipe and a radial spraying pipe, the annular spraying pipe is communicated with the radial spraying pipe, and the communicated part is communicated with a liquid inlet pipeline corresponding to the outer wall of the tower body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221799067.2U CN217829544U (en) | 2022-07-13 | 2022-07-13 | High-efficient ammonia resource recovery processing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221799067.2U CN217829544U (en) | 2022-07-13 | 2022-07-13 | High-efficient ammonia resource recovery processing system |
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| CN217829544U true CN217829544U (en) | 2022-11-18 |
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| CN202221799067.2U Active CN217829544U (en) | 2022-07-13 | 2022-07-13 | High-efficient ammonia resource recovery processing system |
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