CN202322383U - Absorption tower for producing nitric acid - Google Patents

Absorption tower for producing nitric acid Download PDF

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Publication number
CN202322383U
CN202322383U CN2011204057439U CN201120405743U CN202322383U CN 202322383 U CN202322383 U CN 202322383U CN 2011204057439 U CN2011204057439 U CN 2011204057439U CN 201120405743 U CN201120405743 U CN 201120405743U CN 202322383 U CN202322383 U CN 202322383U
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CN
China
Prior art keywords
tower
column plate
absorption tower
layer
nitric acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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CN2011204057439U
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Chinese (zh)
Inventor
景双伍
赵瑞生
李�瑞
郭中华
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TIANJIN HUAJING CHEMICAL NEW TECHNOLOGY DEVELOPMENT Co Ltd
Original Assignee
TIANJIN HUAJING CHEMICAL NEW TECHNOLOGY DEVELOPMENT Co Ltd
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Priority to CN2011204057439U priority Critical patent/CN202322383U/en
Application granted granted Critical
Publication of CN202322383U publication Critical patent/CN202322383U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to an absorption tower for producing nitric acid and belongs to the technical field of nitric acid preparation. A tower plate and a circular cooling water pipeline are arranged in the absorption tower for producing the nitric acid. The adsorption tower is characterized in that a distribution mode of circular cooling water on the tower plate is realized in a way that a closed circular water system is divided into an upper section and a lower section to enter the absorption tower; the upper section and the lower section form a serial structure; the layer number of circular cooling water coiled pipes on each tower plate of three layers of tower plates at the bottom of the absorption tower is 5-7; two acid outlets are formed in the lower part of the tower; one acid outlet is formed in the first layer of tower plate; the other acid outlet is formed in the second layer of tower plate or the third layer of tower player; and acid from the two acid outlets is collected at the outlet at the bottom of the tower. The absorption tower disclosed by the utility model has the advantages that the structure is simple; the design is compact; cooling capacity of water in a closed path is fully utilized; the circulation quantity of desalted water in the closed path system is saved; the energy consumption is reduced; the oxidation rate of NO, the adsorption rate of NO2 and the concentration of nitric acid at the bottom of the absorption tower are increased; the requirement of a downcomer on the maximum liquid dropping quantity is met; the production efficiency is high; and the like.

Description

Nitric acid production is used the absorption tower
Technical field
The utility model belongs to the nitric acid preparing technical field, particularly relates to a kind of nitric acid production and uses the absorption tower.
Background technology
At present, rare nitric acid production mainly adopts double pressurized method technology and overall height platen press technology.In the middle of these two kinds of technologies, " nitric acid absorption tower " arranged.There are following several big problems in existing nitric acid absorption tower:
1, the distribution of absorption tower closed circulating water system and utilize mode unreasonable.All there is a closed cycle water system on the absorption tower of double pressurized method nitric acid plant: " supply outward supply mains on de-salted water → top, absorption tower water coolant → through the supply mains to the water coolant of top, absorption tower of top, absorption tower water coolant n layer coil pipe → top, absorption tower water coolant return main → recirculated water boosting pump → liquefied ammonia vaporizer → again "; Supply the make up water of de-salted water in addition, to keep the pressure of closed circuit circulatory system as closed-circuit system.The de-salted water effect of this closed circuit circulatory system has three: one, takes away the heat of part absorption reaction in the absorption tower; The 2nd, this reaction heat is used for the evaporation of liquefied ammonia vaporizer, take away the cold of liquefied ammonia simultaneously; The 3rd, this cold is used for the cooling on absorption tower.This shows that the recirculated water fluid ammonia evaporator of this closed-circuit system is the water coolant n layer coil pipe (seeing accompanying drawing 4 for details) to top, absorption tower all, circulating water flow is big, and the energy consumption of recirculated water boosting pump is high, is not a kind of the most reasonably design.
2, the design of the decoration form of the spiral coil cooling tube of every layer of column plate is unreasonable.The design arrangement of spiral coil cooling tube all is such on the column plate on the absorption tower of present domestic double pressurized method nitric acid plant: the design number of plies of every layer of column plate spiral coil cooling tube is to reduce successively from bottom to top.Design brings in the production process specific absorption not good like this, and it is still higher to cause absorbing exhaust emissions concentration.
3, absorption tower bottom tray and to go out the design of sour position not good, it is still higher to cause absorbing exhaust emissions concentration, and the finished product dilute acid concentration is still not high.
4, each layer of absorption tower tray spacing design arrangement mode is unreasonable, and the tray spacing design increases from bottom to top successively, designs like this and the actual operating state not in full conformity with the absorption tower.
5, each layer of absorption tower downtake pipe design arrangement mode need be improved.The gap becomes conference and causes the downtake pipe air-resistance phenomenon, and it is obstructed that gap smaller can make downtake pipe fall liquid equally, causes upper strata column plate liquid level constantly to increase, and the absorption tower pressure drop is constantly risen and can't be moved and compelled the parking until device.
Summary of the invention
The utility model provides a kind of nitric acid production to use the absorption tower for solving the problem that prior art exists.
The utility model purpose provides a kind ofly to be had simple in structurely, compact to design, makes full use of the cold of closed circuit water, saves the internal circulating load of closed-circuit system de-salted water, has reduced energy consumption, has improved NO oxidation ratio, NO 2Specific absorption and absorption tower bottom concentration of nitric acid, satisfy the downtake pipe maximum and fall the liquid measure requirement, guarantee that the nitric acid production of producing characteristics such as normally carrying out uses the absorption tower.
The utility model nitric acid production adopts following technical scheme with the absorption tower:
Nitric acid production is used the absorption tower, is provided with column plate and recirculated cooling water pipeline in the tower, is characterized in: the distribution means of column plate cocycle water coolant gets into the absorption tower for the closed cycle water system is divided into two sections; Two sections water cascaded structure; The every column plate cocycle cooling water coil number of plies is 5~7 layers on the three layers of column plate in bottom, absorption tower, and the tower bottom has two to go out the acid mouth, the one, at the first layer column plate; The 2nd, at second layer tower or the 3rd layer of column plate, two acid that go out the acid mouth compile the tower bottom outlet.
The utility model nitric acid production can also adopt following technical measures with the absorption tower:
Described nitric acid production is used the absorption tower; Be characterized in: be provided with in the tower column plate from bottom to top number consecutively be 1# to 40#, the decoration form of every layer of column plate cocycle cooling water coil is that 1#~3# column plate has 5~7 layers of spiral coil cooling tube, 4#~10# column plate has 2~3 layers of spiral coil cooling tube; 11#~13# column plate has 3~4 layers of spiral coil cooling tube; 14#~19# column plate has 4~5 layers of spiral coil cooling tube, and 20#~27# column plate has 2~3 layers of spiral coil cooling tube, and 28#~40# column plate has 1 layer of spiral coil cooling tube.
Described nitric acid production is used the absorption tower, is characterized in: the tray spacing structure is that 1#~4# tray spacing is 2400-2500mm; 4#~11# tray spacing is 900-1100mm; 11#~14# tray spacing is 1000-1100mm; 14#~15# tray spacing is 1000-1150mm; 15#~20# tray spacing is 1200-1350mm; 20#~26# tray spacing is 1150-1300mm; 26#~28# tray spacing is 1400-1550mm; 28#~40# tray spacing is 1400-1550mm.
Described nitric acid production is used the absorption tower, is characterized in: downtake pipe is arranged on the column plate, and the liquid of falling throttle washer is arranged at every layer of downtake pipe bottom.
Described nitric acid production is used the absorption tower, is characterized in: the bottom of downtake pipe throttle washer is provided with spacing tube or distance block.
Advantage that the utlity model has and positively effect:
Nitric acid production owing to adopted the utility model brand-new technology scheme, compared with prior art, the utlity model has following obvious advantage with the absorption tower:
1. the distribution means of water coolant is that closed circulating water system (use de-salted water) system is divided into two sections entering absorption towers on the column plate, and the series connection of two sections water is used.1. the cold that makes full use of closed circuit water is to take away absorption reaction heat; 2. save the internal circulating load of closed-circuit system de-salted water; 3. save the energy consumption of closed circulating water system boosting pump.
2. the cooling water coil decoration form on every layer of column plate.1. make recirculated cooling water more reasonably take away absorption reaction heat; 2. make that the oxidation ratio of NO is further improved in the absorption tower; 3. make NO in the absorption tower 2Specific absorption be further improved; Bottom, absorption tower concentration of nitric acid is further enhanced; Top, absorption tower exhaust emissions concentration is further reduced.
3. three layers of column plate in absorption tower bottom and go out sour position.1. increase tray spacing to improve the oxidation space of NO, the 3rd layer of following oxidation panel of column plate as NO; 2. design the more spiral coil cooling tube number of plies to guarantee the into abundant cooling of tower NOx gas, make the further piece speed of NO oxidation wherein, reach the purpose of abundant raising NO oxidation ratio; 3. the first layer column plate goes out acid and is the condensation of NOx gas acid, measure little but concentration is higher, and second layer column plate goes out acid, and to measure big concentration higher.
4. each layer of absorption tower tray spacing decoration form.Make at NO 2Absorption process in the NO that produces obtain abundant oxidation, guarantee to reach a specific absorption the highest after nitrogen oxide gas gets into the absorption tower.
5. there is certain clearance each layer of absorption tower downtake pipe bottom with column plate.This gap should guarantee to satisfy the requirement that liquid measure falls in the downtake pipe maximum, even consider column plate distortion also can the not causing variation in this gap simultaneously.
Description of drawings
Fig. 1 is that nitric acid production is with up-to-date absorption tower structural representation;
Fig. 2 is nitric acid production with the distribution of up-to-date absorption tower closed circulating water system and utilizes structural representation;
Fig. 3 is that nitric acid production is with up-to-date absorption tower each layer downtake pipe design arrangement structural representation;
Fig. 4 is traditional nitric acid production with the distribution of absorption tower closed circulating water system and utilizes structural representation.
Among the figure, the 1-exhaust port; The external downtake pipe of 2-; The 3-NOx gas feed; The outlet of 4-nitric acid; 5-1#~3# column plate; 6-4#~10# column plate; 7-11#~13# column plate; 8-14#~19# column plate; 9-20#~27# column plate; 10-27#~40# column plate; 11-supplies the total interface tube of cooling water return outward; 12-supplies supply mains's interface on the recirculated cooling water outward; 13-closed circulating water system return main interface; 14-closed cycle supply mains's interface waterborne; The 15-downtake pipe; The 16-column plate; 17-spacing tube or distance block; The 18-throttle washer; 19-closed circulating water system return main interface; 20-supplies the total interface tube of cooling water return outward; 21-closed cycle supply mains's interface waterborne; 22-supplies supply mains's interface on the recirculated cooling water outward.
Embodiment
For further understanding technology contents, characteristics and the effect of the utility model, enumerate following instance now, and conjunction with figs. specifies as follows:
Embodiment 1
With reference to accompanying drawing 1 to Fig. 3.
Nitric acid absorption tower in the double pressurized method nitric acid process is provided with column plate and recirculated cooling water coil pipe in the tower.The distribution means of column plate cocycle water coolant gets into the absorption tower for the closed cycle water system is divided into two sections; Two sections water is cascaded structure; The every column plate cocycle cooling water coil number of plies is 6 layers on the three layers of column plate in bottom, absorption tower, and the tower bottom has two to go out the acid mouth, the one, on the first layer column plate; The 2nd, on second layer column plate or the 3rd layer of column plate, two acid that go out acid mouthful compile the tower bottom outlet.
The concrete structure of present embodiment each several part:
1, the distribution of absorption tower closed circulating water system and utilization.Shown in accompanying drawing 2, closed circulating water system (use de-salted water) system is divided into two sections and gets into the absorption tower, and the series connection of two sections water is used, and supplies supply mains on de-salted water → absorption tower closed-circuit system epimere water coolant → closed-circuit system epimere water coolant n through the absorption tower outward that is: 1Supply mains → closed-circuit system hypomere water coolant n on layer coil pipe → absorption tower closed-circuit system epimere water coolant return main → absorption tower closed-circuit system hypomere water coolant through the absorption tower 2Layer coil pipe → absorption tower closed-circuit system hypomere water coolant return main → recirculated water boosting pump → liquefied ammonia vaporizer → again supply mains to the closed-circuit system epimere water coolant of absorption tower "; supply the make up water of de-salted water in addition, to keep the pressure of closed circuit circulatory system as closed-circuit system.
2, the design arrangement of the spiral coil cooling tube of every layer of column plate.Shown in accompanying drawing 1,1#~6 layers of spiral coil cooling tube of 3# tray designs; 4#~2 layers of spiral coil cooling tube of 10# tray designs; 11#~3 layers of spiral coil cooling tube of 13# tray designs; 14#~4 layers of spiral coil cooling tube of 19# tray designs; 20#~2 layers of spiral coil cooling tube of 27# tray designs; 28#~1 layer of spiral coil cooling tube of 40# tray designs.Purpose is: in actual production process, make NO 2Specific absorption obtain maximum the raising, absorb exhaust emissions concentration and get to the limit and reduce, the finished product dilute acid concentration gets to the limit and improves.
3, absorption tower bottom tray and go out sour position.Shown in accompanying drawing 1, the three layers of tray spacing design in bottom, absorption tower are bigger, and the every column plate cocycle water coil design number of plies also many (6 layers of spiral coil cooling tube of design on every block of column plate); The tower bottom go out sour position be designed to two go out acid mouthful, the one, go out acid from the first layer column plate, the 2nd, go out acid from second layer column plate or the 3rd layer of column plate, go out at the bottom of the acid of two-layer column plate compiles tower.Do like this and its objective is: 1. increase tray spacing to improve the oxidation space of NO, the 3rd layer of following oxidation panel of column plate as NO; 2. design the more spiral coil cooling tube number of plies to guarantee the into abundant cooling of tower NOx gas, make the further piece speed of NO oxidation wherein, reach the purpose of abundant raising NO oxidation ratio; 3. the first layer column plate goes out acid and is the condensation of NOx gas acid, measure little but concentration is higher, and second layer column plate goes out acid, and to measure big concentration higher.
4, each layer of absorption tower tray spacing.Shown in accompanying drawing 1,1#~4# tray spacing is designed to 2420mm; 4#~11# tray spacing is designed to 990mm; 11#~14# tray spacing is designed to 1030mm; 14#~15# tray spacing is designed to 1060mm; 15#~20# tray spacing is designed to 1280mm; 20#~26# tray spacing is designed to 1210mm; 26#~28# tray spacing is designed to 1480mm; 28#~40# tray spacing is designed to 1440mm.Its objective is: according to NO on each layer column plate in the absorption tower 2Different, each layer column plate of absorption reaction heat on and equal each layer of the appropriate design tray spacing of oxidisability of the space NO between the column plate, thereby make at NO 2Absorption process in the NO that produces obtain abundant oxidation, guarantee to reach a specific absorption the highest after nitrogen oxide gas gets into the absorption tower.
5, each layer of absorption tower downtake pipe design arrangement.Shown in accompanying drawing 3, every layer of downtake pipe bottom design has the liquid of falling throttle washer, is full of downtake pipe all the time when guaranteeing in the downtake pipe liquid ordinary production, occurs the vent plug phenomenon when preventing the downtake pipe ordinary production.At the bottom design spacing tube or the distance block of downtake pipe throttle washer, any variation can not take place to guarantee each downtake pipe and column plate gap when the ordinary production, thereby play absorption tower safe and stable operation effect.

Claims (5)

1. nitric acid production is used the absorption tower, is provided with column plate and recirculated cooling water pipeline in the tower, it is characterized in that: the distribution means of column plate cocycle water coolant gets into the absorption tower for the closed cycle water system is divided into two sections; Two sections water cascaded structure; The every column plate cocycle cooling water coil number of plies is 5~7 layers on the three layers of column plate in bottom, absorption tower, and the tower bottom has two to go out the acid mouth, the one, at the first layer column plate; The 2nd, at second layer column plate or the 3rd layer of column plate, two acid that go out the acid mouth compile the tower bottom outlet.
2. use the absorption tower according to the described nitric acid production of claim 1; It is characterized in that: be provided with in the tower column plate from bottom to top number consecutively be 1# to 40#, the decoration form of every layer of column plate cocycle cooling water coil is that 1#~3# column plate has 5~7 layers of spiral coil cooling tube, 4#~10# column plate has 2~3 layers of spiral coil cooling tube; 11#~13# column plate has 3~4 layers of spiral coil cooling tube; 14#~19# column plate has 4~5 layers of spiral coil cooling tube, and 20#~27# column plate has 2~3 layers of spiral coil cooling tube, and 28#~40# column plate has 1 layer of spiral coil cooling tube.
3. use the absorption tower according to claim 1 or 2 described nitric acid production, it is characterized in that: the tray spacing structure is that 1#~4# tray spacing is 2400-2500mm; 4#~11# tray spacing is 900-1100mm; 11#~14# tray spacing is 1000-1100mm; 14#~15# tray spacing is 1000-1150mm; 15#~20# tray spacing is 1200-1350mm; 20#~26# tray spacing is 1150-1300mm; 26#~28# tray spacing is 1400-1550mm; 28#~40# tray spacing is 1400-1550mm.
4. use the absorption tower according to claim 1 or 2 described nitric acid production, it is characterized in that: downtake pipe is arranged on the column plate, and the liquid of falling throttle washer is arranged at every layer of downtake pipe bottom.
5. use the absorption tower according to the described nitric acid production of claim 4, it is characterized in that: the bottom of downtake pipe throttle washer is provided with spacing tube or distance block.
CN2011204057439U 2011-10-21 2011-10-21 Absorption tower for producing nitric acid Expired - Lifetime CN202322383U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011204057439U CN202322383U (en) 2011-10-21 2011-10-21 Absorption tower for producing nitric acid

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Application Number Priority Date Filing Date Title
CN2011204057439U CN202322383U (en) 2011-10-21 2011-10-21 Absorption tower for producing nitric acid

Publications (1)

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CN202322383U true CN202322383U (en) 2012-07-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103011102A (en) * 2012-12-21 2013-04-03 贵州开磷(集团)有限责任公司 Cooling process for desalted water conveyed to nitric acid absorbing tower
CN104014225A (en) * 2014-06-18 2014-09-03 天脊煤化工集团股份有限公司 Three-section absorbing process of acid absorbing tower

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103011102A (en) * 2012-12-21 2013-04-03 贵州开磷(集团)有限责任公司 Cooling process for desalted water conveyed to nitric acid absorbing tower
CN103011102B (en) * 2012-12-21 2014-09-03 贵州开磷(集团)有限责任公司 Cooling process for desalted water conveyed to nitric acid absorbing tower
CN104014225A (en) * 2014-06-18 2014-09-03 天脊煤化工集团股份有限公司 Three-section absorbing process of acid absorbing tower

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Granted publication date: 20120711