CN211896057U - System for preparing ammonia gas by thermal decomposition of ammonium bicarbonate - Google Patents
System for preparing ammonia gas by thermal decomposition of ammonium bicarbonate Download PDFInfo
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- CN211896057U CN211896057U CN202020350683.4U CN202020350683U CN211896057U CN 211896057 U CN211896057 U CN 211896057U CN 202020350683 U CN202020350683 U CN 202020350683U CN 211896057 U CN211896057 U CN 211896057U
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- ammonium bicarbonate
- ammonia
- ammonium carbonate
- ammonium
- storage bin
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- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical group [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000001099 ammonium carbonate Substances 0.000 title claims abstract description 104
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 title claims abstract description 64
- 235000012538 ammonium bicarbonate Nutrition 0.000 title claims abstract description 64
- 238000005979 thermal decomposition reaction Methods 0.000 title claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 31
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 15
- 239000004202 carbamide Substances 0.000 abstract description 11
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 231100000252 nontoxic Toxicity 0.000 abstract description 8
- 230000003000 nontoxic effect Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002602 strong irritant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of ammonia process denitration, concretely relates to ammonium bicarbonate thermal decomposition system ammonia gas system. The system for preparing ammonia by thermally decomposing ammonium bicarbonate comprises an ammonium bicarbonate conveyor, an ammonium bicarbonate storage bin, a variable-frequency metering feeding conveyor, an ammonium bicarbonate thermal decomposer and a cooling fan. The utility model discloses ammonium bicarbonate thermal decomposition system ammonia gas system flow is simple, and equipment is few, and reactor operating pressure is low, operating temperature is low, and the energy consumption is all low than liquid ammonia, aqueous ammonia and urea system ammonia, and ton ammonia raw materials cost is all low than liquid ammonia, aqueous ammonia and urea, and comprehensive consumption cost is also low. The adopted raw materials are safe and nontoxic, are convenient to transport and use, are relatively cheap, and have good application prospects.
Description
Technical Field
The utility model belongs to the technical field of ammonia process denitration, concretely relates to ammonium bicarbonate thermal decomposition system ammonia gas system.
Background
The SCR flue gas denitration technology is one of safe, reliable and mature denitration technologies in the world and is widely applied at home and abroad. In a denitration system, a reducing agent is a main consumable, and the reducing agents which are commonly used at present comprise 3 types: liquid ammonia, ammonia water and urea.
Liquid ammonia and ammonia water as amino reducing agent may be used directly and has low cost, but has the demerits of high volatility, strong irritant smell, high toxic effect to human skin and respiratory tract, dangerous chemical and strict limitation on transportation and storage. Liquid ammonia is also a great hazard source, and the state has now required that all ammonia gas preparation devices from liquid ammonia are replaced by other ammonia gas preparation technologies. The urea has the same denitration performance as liquid ammonia through a chemical reaction product, is a solid fertilizer, is tasteless and nontoxic, is safe to use, and is convenient to transport, store and use. However, the price of urea is higher, the energy consumption for preparing ammonia by decomposing (or hydrolyzing) urea is high, the equipment flow is complex, the investment is high, the flue gas denitration cost is high, and the economic benefit is poor.
SUMMERY OF THE UTILITY MODEL
To the problem that the ammonia process exists among the prior art, the utility model aims to provide an equipment is few, comprehensive cost is low, operating pressure is low, operating temperature is low, the good ammonium bicarbonate thermolysis system ammonia gas system of security.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
ammonium bicarbonate thermal decomposition system of making ammonia includes:
the ammonium carbonate conveyor is used for conveying ammonium carbonate raw materials to the ammonium carbonate storage bin;
the ammonium carbonate storage bin is arranged at the output port of the ammonium carbonate conveyor, and a storage bin stirrer is arranged in the ammonium carbonate storage bin to prevent the ammonium carbonate from arching;
the variable-frequency metering feeding conveyor is arranged at a discharge port at the lower part of the ammonium carbonate storage bin and is used for quantitatively conveying ammonium carbonate to the ammonium carbonate thermal decomposer;
the ammonium bicarbonate thermal decomposer comprises a kettle type reactor, wherein the upper part of the kettle type reactor is provided with an ammonium bicarbonate feeding port and an ammonia gas outlet, and a mixing stirrer and a heater are arranged in the kettle type reactor;
and the air inlet of the cooling fan is connected with the ammonium carbonate storage bin, the air outlet of the cooling fan is connected with the discharge port of the variable-frequency metering feeding conveyor and the interface of the mixing stirrer, and the cooling fan extracts gas in the ammonium carbonate storage bin and cools the material at the discharge port of the variable-frequency metering feeding conveyor and the interface of the mixing stirrer.
The control system comprises a heat source metering controller arranged on the heater, a material level meter arranged on the ammonium bicarbonate thermal decomposer, a pressure controller and a temperature display arranged on an ammonia gas outlet pipeline of the ammonium bicarbonate thermal decomposer.
As a preferred technical scheme, the heater is an electric heater or a steam heater; when the heater is an electric heater, the heat source metering controller adopts a frequency converter, and when the heater is a steam heater, the heat source metering controller adopts an adjusting valve.
The method for preparing ammonia gas by utilizing the ammonia gas preparation system by thermal decomposition of ammonium bicarbonate comprises the following steps:
step one, starting a storage bin stirrer, conveying ammonium bicarbonate raw materials into an ammonium bicarbonate storage bin through an ammonium bicarbonate conveyor, and stopping feeding after the ammonium bicarbonate storage bin is full of materials;
secondly, filling a nontoxic heat-conducting medium into the ammonium bicarbonate thermal decomposer, observing a material level indicator, and stopping filling after the measuring range reaches 80 percent;
thirdly, starting the cooling fan, the heat source metering controller, the mixing stirrer and the variable-frequency metering feeding conveyor in sequence, and decomposing ammonium bicarbonate to produce mixed gas of ammonia gas, carbon dioxide and water;
when the pressure of the ammonia gas outlet pipeline is lower than a set value, a heat source metering controller interlocked with the ammonia gas outlet pipeline controls a heater to increase heat source supply, the ammonium bicarbonate decomposition amount is increased, the material level of the ammonium bicarbonate thermal decomposer is reduced, the rotating speed of a variable-frequency metering feeding conveyor interlocked with the material level of the ammonium bicarbonate thermal decomposer is increased, and the ammonium bicarbonate supply amount is increased;
when the pressure of the ammonia gas outlet pipeline is higher than a set value, the heat source metering controller interlocked with the ammonia gas outlet pipeline controls the heater to reduce heat source supply, the ammonium bicarbonate decomposition amount is reduced, the material level of the ammonium bicarbonate thermal decomposer is increased, the rotating speed of the variable-frequency metering feeding conveyor interlocked with the material level of the ammonium bicarbonate thermal decomposer is reduced, and the ammonium bicarbonate supply amount is reduced.
Wherein:
in the first step, the rotating speed of the storage bin stirrer is 0.1-0.3 rpm.
In the second step, the non-toxic heat-conducting medium can be a heat-conducting medium with a boiling point of 100-290 ℃, and the heat-conducting medium is added at one time and is not added later.
In the third step, the rotating speed of the mixing stirrer is 25-100 rpm, and the mixing effect can be achieved.
In the fourth step, the pressure of the ammonia gas outlet pipeline is influenced by the requirement of the pressure of the ammonia gas used by the rear system, and the pressure is controlled to be 2000-9000 Pa, so that the requirement of the rear system can be met; the temperature of the ammonia gas outlet pipeline is controlled to be 90-140 ℃.
In the fourth step, when steam is used as a heating source, the production requirements can be met by low-pressure steam with the steam of 400-900 KPa.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the system for preparing ammonia gas by thermally decomposing ammonium carbonate has the advantages of simple flow, less equipment, low working pressure, low working temperature and good safety of the kettle-type reactor, simple structure, lower energy consumption than those of ammonia preparation from liquid ammonia, ammonia water and urea, lower cost of raw materials per ton of ammonia than those of liquid ammonia, ammonia water and urea and low comprehensive consumption cost.
(2) The method for preparing ammonia gas by thermally decomposing ammonium bicarbonate adopts safe and nontoxic raw materials, is convenient to transport and use, has relatively low price, and is superior to other methods for preparing ammonia; can be applied in cities close to residential areas, can produce ammonia gas on a large scale and has good application prospect.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1 is a schematic structural diagram of an ammonia gas production system by thermal decomposition of ammonium bicarbonate in an embodiment of the present invention;
FIG. 2 is a flow chart of the process of the ammonia gas production system by thermal decomposition of ammonium bicarbonate in the embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention have been described by way of illustration only. Needless to say, a person skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1, the system for producing ammonia by thermal decomposition of ammonium bicarbonate comprises an ammonium bicarbonate conveyor 1, an ammonium bicarbonate storage bin 2, a variable-frequency metering feeding conveyor 3, an ammonium bicarbonate thermal decomposer 4 and a cooling fan 5.
Wherein:
the ammonium carbonate conveyor 1 can adopt a screw conveyor and is used for conveying ammonium carbonate raw materials to the ammonium carbonate storage bin 2, and the ammonium carbonate raw materials can adopt bagged ammonium carbonate or ammonium chloride;
the ammonium carbonate storage bin 2 is arranged at the output port of the ammonium carbonate conveyor 1, and a storage bin stirrer 21 and a storage bin level meter 22 are installed in the ammonium carbonate storage bin 2;
the variable-frequency metering feeding conveyor 3 is arranged at a discharge port at the lower part of the ammonium carbonate storage bin 2 and is used for quantitatively conveying ammonium carbonate to the ammonium carbonate thermal decomposer 4;
the ammonium bicarbonate thermal decomposer 4 comprises a kettle type reactor 41, wherein the upper part of the kettle type reactor 41 is provided with an ammonium bicarbonate feeding port 42, an ammonia gas outlet 43 and a heat-conducting medium feeding port 44, a mixing stirrer 45 and a heater 46 are installed in the kettle type reactor 41, and the heater 46 can adopt an electric heater or a steam heater;
cooling fan 5, cooling fan 5's income wind gap is connected with ammonium carbonate warehouse 2, cooling fan 5's air outlet is connected with frequency conversion measurement feeding conveyer discharge gate, mixing stirrer interface, cooling fan 5 extracts the gas in the ammonium carbonate warehouse 2 and for ammonium carbonate measurement feeding conveyer discharge gate, mixing stirrer interface material cooling, avoids the high temperature.
The device also comprises a control system 6, wherein the control system 6 comprises a heat source metering controller 61 arranged on the heater 46, a thermal decomposer material level meter 62 arranged on the ammonium bicarbonate thermal decomposer 4, and a pressure controller 63 and a temperature display 64 arranged on an ammonia gas outlet pipeline of the ammonium bicarbonate thermal decomposer. In the present embodiment, the heater 46 is exemplified by a steam heater, and the heat source metering controller 61 employs a steam regulating valve accordingly. Wherein, a thermal decomposer material level meter 62 on the ammonium bicarbonate thermal decomposer 4 is interlocked and adjusted with the variable-frequency metering feeding conveyor 3, and a pressure controller 63 on an ammonia gas outlet pipeline is interlocked and adjusted with the opening degree of a steam regulating valve on a steam pipeline.
Referring to fig. 1 and 2, the preparation method includes the steps of:
step one, starting a storage bin stirrer 21, conveying ammonium bicarbonate raw materials into an ammonium bicarbonate storage bin 2 through an ammonium bicarbonate conveyor 1, observing a storage bin level meter 22, and stopping feeding after the materials are full; the rotation speed of the storage bin stirrer 21 is controlled to be 0.2 rpm;
secondly, filling non-toxic heat-conducting medium into the ammonium bicarbonate thermal decomposer 4 from the heat-conducting medium feed inlet 44, observing a thermal decomposer level indicator 62, and stopping filling after 80% of measuring range is reached; the nontoxic heat-conducting medium can be heat-conducting medium with boiling point of 290 ℃, and the heat-conducting medium is added at one time and is not added any more later;
step three, starting the cooling fan 5, the heat source metering controller 61, the mixing stirrer 45 and the variable-frequency metering feeding conveyor 3 in sequence, and decomposing ammonium bicarbonate to produce mixed gas of ammonia gas, carbon dioxide and water; the rotating speed of the mixing stirrer is controlled to be 25-100 rpm, and the stirring and mixing effects can be achieved;
fourthly, the pressure of the ammonia gas outlet pipeline is influenced by the requirement of the pressure of the ammonia gas used by the post system, and is controlled to be 5000-6000 Pa, so that the requirement of the post system can be met; controlling the temperature of the ammonia gas outlet pipeline to be 90-140 ℃;
when the pressure of the ammonia gas outlet pipeline is lower than a set value, the opening degree of a steam regulating valve interlocked with the ammonia gas outlet pipeline is increased, the supply of a heat source is increased, the decomposition amount of ammonium bicarbonate is increased, the material level of the ammonium bicarbonate thermal decomposer is reduced, the rotating speed of a variable-frequency metering feeding conveyor interlocked with the material level of the ammonium bicarbonate thermal decomposer is increased, and the supply amount of ammonium bicarbonate is increased;
when the pressure of the ammonia gas outlet pipeline is higher than a set value, the opening of a steam regulating valve interlocked with the ammonia gas outlet pipeline is reduced, the supply of a heat source is reduced, the decomposition amount of ammonium bicarbonate is reduced, the material level of the ammonium bicarbonate thermal decomposer is increased, the rotating speed of a variable-frequency metering feeding conveyor interlocked with the material level of the ammonium bicarbonate thermal decomposer is reduced, and the supply amount of ammonium bicarbonate is reduced.
Take 500kg/h ammonia to exert oneself as the example, the utility model discloses the urea hydrolysis system ammonia among ammonium carbonate system ammonia and the prior art invests in and the operation cost of consuming is to such as following:
it can be seen by last table contrast, the utility model discloses ammonium bicarbonate thermal decomposition ammonia gas preparation method, not only equipment investment cost greatly reduced, the energy consumption is all low than liquid ammonia, aqueous ammonia and urea system ammonia moreover, and ton ammonia raw materials cost is all low than liquid ammonia, aqueous ammonia and urea, and comprehensive consumption cost is also low.
The method for preparing ammonia gas by thermally decomposing ammonium bicarbonate adopts safe and nontoxic raw materials, is convenient for transportation and use, has relatively low price, and is superior to other methods for preparing ammonia; can be applied in cities close to residential areas, can produce ammonia gas on a large scale and has good application prospect.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (3)
1. Ammonium bicarbonate thermal decomposition system of making ammonia, its characterized in that includes:
the ammonium carbonate conveyor is used for conveying ammonium carbonate raw materials to the ammonium carbonate storage bin;
the ammonium carbonate storage bin is arranged at the output port of the ammonium carbonate conveyor, and a storage bin stirrer is arranged in the ammonium carbonate storage bin to prevent the ammonium carbonate from arching;
the variable-frequency metering feeding conveyor is arranged at a discharge port at the lower part of the ammonium carbonate storage bin and is used for quantitatively conveying ammonium carbonate to the ammonium carbonate thermal decomposer;
the ammonium bicarbonate thermal decomposer comprises a kettle type reactor, wherein the upper part of the kettle type reactor is provided with an ammonium bicarbonate feeding port and an ammonia gas outlet, and a mixing stirrer and a heater are arranged in the kettle type reactor;
and an air inlet of the cooling fan is connected with the top of the ammonium carbonate storage bin, an air outlet of the cooling fan is connected with a discharge port of the variable-frequency metering feeding conveyor and a mixing stirrer interface, and the cooling fan extracts gas in the ammonium carbonate storage bin and cools materials at the discharge port of the variable-frequency metering feeding conveyor and the mixing stirrer interface.
2. The system for producing ammonia by thermal decomposition of ammonium bicarbonate as claimed in claim 1, wherein: the control system comprises a heat source metering controller arranged on the heater, a material level meter arranged on the ammonium bicarbonate thermal decomposer, and a pressure controller and a temperature display arranged on an ammonia gas outlet pipeline of the ammonium bicarbonate thermal decomposer.
3. The system for producing ammonia by thermal decomposition of ammonium bicarbonate as claimed in claim 2, wherein: the heater is an electric heater or a steam heater; when the heater is an electric heater, the heat source metering controller adopts a frequency converter, and when the heater is a steam heater, the heat source metering controller adopts a steam regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020350683.4U CN211896057U (en) | 2020-03-19 | 2020-03-19 | System for preparing ammonia gas by thermal decomposition of ammonium bicarbonate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020350683.4U CN211896057U (en) | 2020-03-19 | 2020-03-19 | System for preparing ammonia gas by thermal decomposition of ammonium bicarbonate |
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| CN211896057U true CN211896057U (en) | 2020-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233004A (en) * | 2020-03-19 | 2020-06-05 | 江苏中顺节能科技有限公司 | System and method for preparing ammonia gas by thermal decomposition of ammonium bicarbonate |
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- 2020-03-19 CN CN202020350683.4U patent/CN211896057U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233004A (en) * | 2020-03-19 | 2020-06-05 | 江苏中顺节能科技有限公司 | System and method for preparing ammonia gas by thermal decomposition of ammonium bicarbonate |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Ammonia gas production system through thermal decomposition of ammonium bicarbonate Granted publication date: 20201110 Pledgee: Agricultural Bank of China Limited Nanjing Jiangning Branch Pledgor: JIANGSU ZHONGSHUN ENERGY CONSERVATION TECHNOLOGY CO.,LTD. Registration number: Y2024980020635 |