CN212236685U - Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water - Google Patents
Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water Download PDFInfo
- Publication number
- CN212236685U CN212236685U CN202022108094.8U CN202022108094U CN212236685U CN 212236685 U CN212236685 U CN 212236685U CN 202022108094 U CN202022108094 U CN 202022108094U CN 212236685 U CN212236685 U CN 212236685U
- Authority
- CN
- China
- Prior art keywords
- ammonia
- water
- roasting furnace
- heat exchanger
- gas
- 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.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model belongs to the technical field of aluminium hydroxide calcination, concretely relates to aluminium hydroxide roasting furnace denitration system for extracting ammonia by using coal gas condensate water, which comprises an ammonia evaporation tower, a condenser, an ammonia water injection unit, a first cyclone preheater, a dust remover, a flue gas waste heat exchanger, a flash tank and other devices which are connected in sequence, wherein the ammonia evaporation tower, the condenser, the ammonia water injection unit, the first cyclone preheater, the dust remover, the flue gas waste heat exchanger, the flash tank and the like combine the ammonia evaporation of the coal gas condensate water with the roasting furnace denitration, extract the ammonia in the coal gas condensate water, serve as; the ammonia distillation method has the advantages of no consumption of new steam, low cost, ammonia extraction, removal of volatile harmful substances in condensed water, energy conservation, environmental protection and cost reduction.
Description
Technical Field
The utility model belongs to the technical field of the aluminium hydroxide calcination, concretely relates to utilize gas condensate water to draw aluminium hydroxide roasting furnace deNOx systems of ammonia.
Background
The aluminum industry has extremely important status and function in national economy and social development of China, and the roasting of aluminum hydroxide is the last process in the production process of aluminum oxide and is an important link for determining the yield and quality of the aluminum oxide, the energy consumption in the production process and the pollutant emission. At present, the aluminum hydroxide roasting technology in China widely adopts a gaseous suspension roasting furnace, fuel air is combusted in the roasting furnace to generate high-temperature flue gas, the high-temperature flue gas heats an aluminum hydroxide material to complete dehydration and partial crystal phase conversion processes, aluminum oxide is generated, and a qualified aluminum oxide product is finally obtained through multi-stage cooling.
With the improvement of the environmental emission standard, the reduction of the emission of nitrogen oxides in the roasting process of alumina is a problem to be solved urgently. In the calcination of aluminium hydroxide, in the production of alumina, in particularThe roasting process of alumina has the heat source provided by burning fuel to produce N2Oxidation at high temperature to produce NO, NO2And N2O3The nitrogen oxides and the flue gas discharged by the aluminum hydroxide roasting furnace contain 200-400 mg/Nm3And the nitrogen oxides can harm the environment and influence the safety of people.
In order to treat nitrogen oxides in the roasting process, in the prior art, patent document with an authorization publication number of CN107281915B provides a denitration method of an SNCR and SCR combined denitration system for alumina roasting flue gas, an organic ammonia compound and first purified flue gas are subjected to SNCR denitration reaction at 900-1100 ℃ to obtain first purified flue gas, ammonia gas and the first purified flue gas are subjected to SNCR denitration reaction at 900-1100 ℃ to obtain second purified flue gas, and the second purified flue gas containing ammonia gas is subjected to SCR reaction in a cyclone separator to obtain purified flue gas. In the technical scheme, although the ammonia gas denitration can obtain a better denitration effect, organic ammonia compounds and ammonia gas need to be purchased, so that the investment cost, the operating cost and the production cost of the waste gas treatment of enterprises are increased.
On the other hand, the circulating fluid state roasting furnace is generally adopted in the production of aluminum oxide in China, at present, the producer gas or clean gas is mostly adopted as a fuel in the aluminum hydroxide roasting furnace in China, a large amount of gas is consumed in the roasting process, the temperature is as high as about 900-1100 ℃, a certain amount of gas condensate water is generated in the gas making process of the gas, the gas condensate water contains volatile ammonia, the subsequent treatment process is complex, and the energy consumption is high.
Therefore, in order to fully utilize the heat in the roasting system, treat the coal gas condensate water generated in the process of making coal gas and make the nitrogen oxide generated in the production process of alumina meet the emission limit value of aluminum industry pollutant emission standard, proper systems and processes are required to be adopted to carry out denitration treatment on the alumina roasting flue gas.
SUMMERY OF THE UTILITY MODEL
The utility model provides an aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water, which solves the problem of low energy recovery utilization rate in the roasting process in the prior art.
The utility model discloses an utilize aluminium hydroxide of coal gas condensate water extraction ammonia to bake burning furnace deNOx systems over a slow fire adopts following technical scheme: an aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water comprises:
the ammonia still is communicated with the coal gas making unit through a pipeline and used for heating the coal gas condensate water conveyed from the coal gas making unit;
the condenser is communicated with the ammonia still and is used for converting steam and ammonia gas separated out from the top of the ammonia still into ammonia water;
the ammonia water injection unit is connected with an ammonia water outlet of the condenser and is used for injecting the ammonia water in the condenser into the roasting furnace;
the first cyclone preheater is used for separating solids in the roasting system to obtain high-temperature flue gas;
the dust remover is connected with the first cyclone preheater and is used for removing dust and purifying the dust-containing flue gas;
the flue gas waste heat exchanger is communicated with the dust remover and the ammonia still and can exchange heat for the kettle liquid sent from the ammonia still by adopting the flue gas purified by the dust remover;
and the flash tank is communicated with the flue gas waste heat exchanger and the ammonia still and is used for carrying out reduced pressure flash evaporation on the kettle liquid after heat exchange and sending steam to the ammonia still.
Preferably, the system further comprises a heat exchanger for preheating the coal gas condensate water, and a heat exchange medium pipeline of the heat exchanger is connected with a kettle liquid outlet of the ammonia still.
Preferably, the heat exchanger is a plate heat exchanger.
Preferably, the ammonia water injection unit comprises an ammonia water storage tank, a distribution module and an injection module which are connected in sequence, the ammonia water storage tank is connected with the condenser and used for storing ammonia water, the ammonia water is conveyed to the metering and distribution module through a conveying pump and is uniformly distributed to the injection module, the injection module comprises a plurality of spray guns, and the ammonia water is injected into the roasting furnace through the spray guns;
preferably, a kettle liquid circulating pump is arranged on a kettle liquid conveying pipeline between the ammonia still and the flue gas waste heat exchanger.
Preferably, the heat exchanger is a plate heat exchanger.
Preferably, draught fans are arranged on the dust remover and the pipeline of the flue gas waste heat exchanger.
Preferably, an ammonia water delivery pump is arranged on a pipeline between the ammonia water storage tank and the distribution module.
The utility model has the advantages that:
the denitration system comprises an ammonia evaporation tower, a condenser, an ammonia water injection unit, a first cyclone preheater, a dust remover, a flue gas waste heat exchanger, a flash tank and other devices which are sequentially connected, wherein ammonia evaporation of coal gas condensate water is combined with denitration of a roasting furnace, ammonia in the coal gas condensate water is extracted and serves as a denitration reducing agent of the roasting furnace, a reducing agent does not need to be purchased, and the production cost of enterprises is reduced; the ammonia distillation method has the advantages of no consumption of new steam, low cost, ammonia extraction, removal of volatile harmful substances in condensed water, energy conservation, environmental protection and cost reduction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an embodiment of a denitration system of an aluminum hydroxide roaster using a gas condensate to extract ammonia according to the present invention;
reference numerals:
1. the system comprises a first cyclone preheater, 11, a fourth cyclone preheater, 12, a third cyclone preheater, 13, a draught fan, 14, a kettle liquid circulating pump, 15, an ammonia water delivery pump, 2, a dust remover, 3, a flue gas waste heat exchanger, 4, a flash tank, 5, an ammonia still, 6, a plate heat exchanger, 7, a condenser, 8, an ammonia water storage tank, 9, a distribution module, 10 and an injection module.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many other forms than those specifically described herein and similar modifications can be made by one skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not limited to the embodiments of the substrate disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1, which is a schematic structural diagram of an aluminum hydroxide roasting furnace denitration system extracting ammonia by using gas condensate water in an embodiment, the utility model discloses an aluminum hydroxide roasting furnace denitration system extracting ammonia by using gas condensate water, which is used for performing denitration treatment on nitrogen oxides generated in the roasting process of aluminum hydroxide, and mainly comprises an ammonia still 5, a condenser 7, an ammonia water injection unit, a first cyclone preheater 1, a dust remover 2, a flue gas waste heat exchanger 3, a flash tank 4 and other devices which are connected in sequence.
The ammonia still 5 is communicated with the coal gas making unit through a pipeline and is used for heating the coal gas condensate water conveyed from the coal gas making unit; in the embodiment, the system also comprises a heat exchanger for preheating the coal gas condensate water, wherein a heat exchange medium pipeline of the heat exchanger is connected with a kettle liquid outlet of the ammonia still 5, the temperature of the kettle liquid outlet of the ammonia still 5 is 100 ℃, the temperature of the coal gas condensate water is 25 ℃, in order to fully utilize the heat energy in the system, partial kettle liquid in the ammonia still 5 is used for preheating the coal gas condensate water, the temperature of the preheated coal gas condensate water is 45 +/-2 ℃, the temperature of waste liquid after heat exchange is 67 +/-5 ℃, and the waste liquid is sent to a coal yard for dust fall; specifically, the heat exchanger used for preheating the coal gas condensate water is a plate heat exchanger 6, and has the characteristics of uniform heat exchange and high efficiency.
And the condenser 7 is communicated with the ammonia still 5 and is used for converting steam and ammonia gas separated out from the top of the ammonia still 5 into ammonia water, and the temperature of the condensed ammonia water is 45 ℃.
The ammonia water injection unit is connected with an ammonia water outlet of the condenser 7 and is used for injecting the ammonia water in the condenser 7 into the roasting furnace system; in the embodiment, the ammonia water injection unit comprises an ammonia water storage tank 8, a distribution module 9 and an injection module 10 which are sequentially connected, wherein the ammonia water storage tank 8 is connected with a condenser 7 and used for storing ammonia water, the ammonia water is conveyed to the metering distribution module 9 through a conveying pump and is uniformly distributed to the injection module 10, the injection module 10 comprises a plurality of spray guns, and the ammonia water is injected into the roasting furnace system through the spray guns; specifically, the roasting furnace system is well known to those skilled in the art, and the roasting furnace system in this embodiment includes a fourth cyclone preheater 11, a third cyclone preheater 12, a second cyclone preheater, and a first cyclone preheater 1, which are connected in sequence, wherein the fourth cyclone preheater 11 is mainly used for roasting aluminum hydroxide to produce aluminum oxide, the third cyclone preheater 12, the second cyclone preheater, and the first cyclone preheater 1 are mainly used for separating aluminum oxide solids and reducing flue gas temperature, the temperature in the fourth cyclone preheater 11 is 1000 ℃, the temperature in the third cyclone preheater 12 is 950 ℃, and after ammonia water in this embodiment is injected into the roasting system, the ammonia water mainly performs SNCR reaction with nitrogen oxides in the fourth cyclone preheater 11 and the third cyclone preheater 12.
The first cyclone preheater 1 is used for heating up solids, cooling down flue gas, and separating solids in the roasting system to obtain high-temperature flue gas, and the temperature of the high-temperature flue gas treated by the first cyclone preheater 1 is 150-160 ℃.
And the dust remover 2 is connected with the first cyclone preheater 1 and is used for removing dust and purifying the dust-containing flue gas.
The flue gas waste heat exchanger 3 is communicated with the dust remover 2 and the ammonia still 5, the draught fan 13 is arranged on the pipelines of the dust remover 2 and the flue gas waste heat exchanger 3, the flue gas purified by the dust remover 2 can be used for exchanging heat with the kettle liquid sent from the ammonia still 5, the purified flue gas transfers heat to the kettle liquid and then is discharged into the atmosphere, the kettle liquid is preheated by fully utilizing the waste heat of the flue gas and then is sent for flash evaporation, and the utilization rate of the waste heat in the system is further improved; and a kettle liquid circulating pump 14 is arranged on a kettle liquid conveying pipeline between the ammonia still 5 and the flue gas waste heat exchanger 3.
And the flash tank 4 is communicated with the flue gas waste heat exchanger 3 and the ammonia still 5 and is used for carrying out reduced pressure flash evaporation on the kettle liquid after heat exchange and sending steam to the ammonia still 5, so that the kettle liquid in the ammonia still 5 is recycled.
An ammonia water delivery pump 15 is arranged on a pipeline between the ammonia water storage tank 8 and the distribution module 9, and the ammonia water delivery pump 15 pumps the ammonia water in the ammonia water storage tank 8 into the distribution module 9.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. An aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water is characterized by comprising the following components:
the ammonia still is communicated with the coal gas making unit through a pipeline and used for heating the coal gas condensate water conveyed from the coal gas making unit;
the condenser is communicated with the ammonia still and is used for converting steam and ammonia gas separated out from the top of the ammonia still into ammonia water;
the ammonia water injection unit is connected with an ammonia water outlet of the condenser and is used for injecting the ammonia water in the condenser into the roasting furnace system;
the first cyclone preheater is used for separating solids in the roasting system to obtain high-temperature flue gas;
the dust remover is connected with the first cyclone preheater and is used for removing dust and purifying the dust-containing flue gas;
the flue gas waste heat exchanger is communicated with the dust remover and the ammonia still and can exchange heat for the kettle liquid sent from the ammonia still by adopting the flue gas purified by the dust remover;
and the flash tank is communicated with the flue gas waste heat exchanger and the ammonia still and is used for carrying out reduced pressure flash evaporation on the kettle liquid after heat exchange and sending steam to the ammonia still.
2. The aluminum hydroxide roasting furnace denitration system for extracting ammonia by using gas condensate water as claimed in claim 1, wherein the system further comprises a heat exchanger for preheating the gas condensate water, and a heat exchange medium pipeline of the heat exchanger is connected with a kettle liquid outlet of the ammonia still.
3. The aluminum hydroxide roasting furnace denitration system for extracting ammonia by using gas condensate water as claimed in claim 2, wherein the heat exchanger is a plate heat exchanger.
4. The aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water as claimed in any one of claims 1 to 3, wherein the ammonia water injection unit comprises an ammonia water storage tank, a distribution module and an injection module which are connected in sequence, the ammonia water storage tank is connected with the condenser and is used for storing ammonia water, the ammonia water is conveyed to the metering and distribution module through a conveying pump and is uniformly distributed to the injection module, and the injection module comprises a plurality of spray guns, and the ammonia water is injected into the roasting furnace through the spray guns.
5. The aluminum hydroxide roasting furnace denitration system using gas condensed water to extract ammonia according to claim 4, wherein a kettle circulating pump is arranged on a kettle conveying pipeline between the ammonia still and the flue gas waste heat exchanger.
6. The aluminum hydroxide roasting furnace denitration system using the gas condensed water to extract ammonia according to claim 5, wherein an induced draft fan is arranged on a pipeline of the dust remover and the flue gas waste heat exchanger.
7. The aluminum hydroxide roasting furnace denitration system for extracting ammonia by using gas condensed water as claimed in claim 6, wherein an ammonia water delivery pump is arranged on a pipeline between the ammonia water storage tank and the distribution module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022108094.8U CN212236685U (en) | 2020-09-23 | 2020-09-23 | Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022108094.8U CN212236685U (en) | 2020-09-23 | 2020-09-23 | Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212236685U true CN212236685U (en) | 2020-12-29 |
Family
ID=73981648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022108094.8U Active CN212236685U (en) | 2020-09-23 | 2020-09-23 | Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212236685U (en) |
-
2020
- 2020-09-23 CN CN202022108094.8U patent/CN212236685U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103900391A (en) | Selective sintering machine flue gas heat exchange denitration system and method thereof | |
| CN206064161U (en) | A kind of middle low-temperature denitration of flue gas device | |
| CN102863061B (en) | Drying energy-saving method and device for producing polyaluminium chloride water purifying agent | |
| CN106705091B (en) | A kind of system and method for slowing down SCR catalyst inactivation and air preheater and blocking | |
| CN103877856A (en) | Coke oven flue gas waste heat utilization and purification method | |
| CN112484064B (en) | System and method for recovering waste heat boiler flue gas of propane dehydrogenation device | |
| CN105013323A (en) | Coke oven flue gas energy-saving desulfurization and denitrification integrated system | |
| CN104154548A (en) | Technique for recycling heat energy of tail gas of gas-fired boiler and purifying nitric oxide | |
| CN104549561A (en) | Method for regenerating selective reduction denitration catalyst for flue gas | |
| CN104399370A (en) | Lower temperature flue gas SCR (Selective Catalytic Reduction) denitration system and process | |
| CN212575985U (en) | Ultralow emission treatment system for coke oven flue gas | |
| CN212236685U (en) | Aluminum hydroxide roasting furnace denitration system for extracting ammonia by utilizing gas condensed water | |
| CN203777934U (en) | Denitration device for flue gas purification of steel sintering machine | |
| CN112023660A (en) | Denitration system and process for aluminum hydroxide roasting furnace by extracting ammonia from coal gas condensed water | |
| CN105194990A (en) | Flue gas comprehensive management system applicable to coke refining oven | |
| CN205592967U (en) | A waste heat power generation system for dangerous waste disposal trade of industry | |
| CN209809934U (en) | Kiln tail flue gas purification system of novel dry-method cement kiln | |
| CN110894954A (en) | High-temperature tail gas purification and waste heat recovery system | |
| CN110963507A (en) | Ammonia water ammonia production system and process for coke oven flue gas denitration | |
| CN205730894U (en) | A kind of low-temperature denitration wet method sulphur removing and dust removing also ensures the system that chimney is hot standby | |
| CN204563937U (en) | A kind of low-temperature smoke air SCR denitrating system | |
| CN212576015U (en) | Coke oven flue gas low temperature denitrification facility | |
| CN210964335U (en) | Comprehensive synergistic treatment system for calcination tail gas of titanium dioxide rotary kiln | |
| CN106918029A (en) | A kind of coking energy coupling optimization and pollutant collaboration governing system and its method | |
| CN109292863B (en) | Pickling waste liquid regeneration system and method for removing free acid in advance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |