CN106166455B - Denitration ammonia pretreatment systems - Google Patents
Denitration ammonia pretreatment systems Download PDFInfo
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- CN106166455B CN106166455B CN201610652041.8A CN201610652041A CN106166455B CN 106166455 B CN106166455 B CN 106166455B CN 201610652041 A CN201610652041 A CN 201610652041A CN 106166455 B CN106166455 B CN 106166455B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/122—Gaseous reactants
Abstract
The invention provides a denitration ammonia gas pretreatment system, which comprises: a liquid ammonia evaporation device and an ammonia air mixing device. The industrial ammonia can be quickly, safely and stably gasified and diluted to form the ammonia air mixed gas with stable temperature and uniform concentration, so that the stable operation of the denitration system and the main plant main machine system is ensured, and the standard emission of nitrogen oxide discharged from the denitration outlet is favorably ensured.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to the technical field of flue gas denitration treatment, and specifically relates to a denitration ammonia gas pretreatment system.
Background
Boilers burning fossil fuels (such as coal, oil, natural gas) generate a large amount of flue gas, which contains harmful substances such as nitrogen oxides (NOx) which are a greenhouse gas and destroy the ozone layer. Direct harm to human health; participate in the formation of photochemical smog and acid rain, thereby causing environmental pollution; to reduce the environmental and human harm of NOx, the nation places increasingly stringent requirements on the concentration of NOx emissions in the flue gas produced by boilers. To achieve lower levels of NOx emissions and to mitigate and eliminate the harm of NOx to humans, the boiler flue gas is typically passed through a flue gas denitrator to remove a substantial portion of the NOx from the flue gas before it is discharged into the atmosphere.
Development and reform committee issued coal-electric energy conservation, emission reduction, upgrade and transformation action plan (2014-2020) severely controls atmospheric pollutant emission. A newly-built coal-fired power generating unit (including a unit which is built and projects and is brought into national thermal power construction planning) should be synchronously built with an advanced high-efficiency denitration facility, a flue gas bypass channel is not required to be arranged, and a denitration pollutant emission concentration limit value of the coal-fired power generating unit is newly built and modified (namely, the emission concentration of nitrogen oxides is not higher than 50 mg/cubic meter under the condition that the reference oxygen content is 6%). The emission concentration of air pollutants of newly-built coal-fired generating sets in eastern regions (11 cities of Liaoning, Beijing, Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan and the like) basically reaches the emission limit value of a gas turbine set (namely, the emission concentrations of smoke dust, sulfur dioxide and nitrogen oxides are respectively not higher than 10 mg/cubic meter, 35 mg/cubic meter and under the condition that the reference oxygen content is 6%). The newly built units in the middle area (8 provinces such as Heilongjiang, Jilin, Shanxi, Anhui, Hubei, Hunan, Henan, Jiangxi and the like) are close to or reach the emission limit of the gas turbine unit in principle, and the newly built units in the west area are encouraged to be close to or reach the emission limit of the gas turbine unit. And the synchronous development of the combined and synergistic removal of the atmospheric pollutants is supported, and the emission of pollutants such as sulfur trioxide, mercury, arsenic and the like is reduced.
Among the flue gas denitration treatment methods, the SCR method is the most widely applied method and has the advantages of large flue gas treatment amount, high efficiency, stable operation and the like. The SCR method is to arrange a catalyst required by denitration reaction at the tail part of a boiler, and the flue gas temperature is generally in a flue region of 290 ℃ and 420 ℃. The flue gas is fully mixed with a reducing agent (generally ammonia) sprayed into the flue before passing through the catalyst, and when the flue gas passes through the catalyst, NOx in the flue gas reacts with the reducing agent ammonia under the action of the catalyst to generate harmless N2And water, thereby removing NOx from the flue gas.
During the denitration reaction, ammonia is indispensable as a reducing agent. However, when the volume concentration of ammonia in the air reaches 16-25%, a II-type flammable and explosive mixture can be formed, and great potential safety hazards exist. In addition, the raw material state of the existing industrial ammonia is often liquid.
Therefore, before the ammonia gas enters the denitration system, pretreatment is required to gasify and dilute the ammonia to obtain an ammonia gas-air mixed gas with stable temperature and concentration. Although the existing denitration system is generally provided with a pretreatment system, the existing denitration system has some defects.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a denitration ammonia gas pretreatment system, which can gasify and dilute industrial ammonia rapidly, safely and stably into an ammonia gas-air mixed gas with stable temperature and uniform concentration, so as to ensure stable operation of a denitration system and a main plant main machine system, and advantageously ensure that nitrogen oxides discharged from a denitration outlet meet the emission standards.
In order to achieve the purpose, the invention adopts the technical scheme that:
a denitration ammonia gas pretreatment system, comprising:
a liquid ammonia evaporation device and an ammonia air mixing device;
the liquid ammonia evaporation device includes: an evaporator body having a cavity for receiving a medium; a liquid ammonia heat exchanger disposed in the evaporator body; one end of the liquid ammonia heat exchanger is connected with the liquid ammonia inlet, the other end of the liquid ammonia heat exchanger is communicated with an ammonia gas collecting device arranged in the evaporator body, the ammonia gas collecting device is provided with an ammonia gas outlet and at least one safety release gas outlet, and an electric heater and a steam heating and spraying device are respectively arranged in the cavity; the power of the electric heater is regulated and controlled by a control and regulation switch; the steam heating and spraying device is connected with a steam inlet pipeline, and an adjusting device is arranged on the steam inlet pipeline; the control regulating switch and the regulating device are both connected with a control system;
the ammonia air mixing device comprises: the mixer comprises a mixer body, wherein one side of the mixer body is connected with an air inlet section, and the other side of the mixer body is connected with a mixed gas outlet section; the ammonia gas spray pipe extends into the mixer body and is close to the air inlet section, the spraying direction of the ammonia gas spray pipe points to the mixed gas outlet, and the outlet section of the ammonia gas spray pipe is consistent with the axis of the mixer body and is positioned at the center of the mixer body; the inner wall of the mixer body is provided with a plurality of guide vanes which are respectively arranged on two sides of the mixer body in a staggered manner; the edge of one side of the guide vane connected with the inner wall of the mixer body is provided with at least one through hole; the edge of one side of the guide vane, which is not connected with the inner wall of the mixer body, is provided with a plurality of uniformly distributed slender grooves;
the gas ammonia outlet is connected to an inlet end of an ammonia buffer tank, and the outlet end of the ammonia buffer tank is communicated with the ammonia gas spray pipe.
Further, the evaporator also comprises a liquid level measuring device and a medium temperature measuring device which are arranged on the evaporator body; the pressure measuring device and the ammonia gas temperature measuring device are arranged at the ammonia gas outlet; the liquid level measuring device, the medium temperature measuring device, the pressure measuring device and the ammonia gas temperature measuring device are in signal connection with the control system.
Further, the Control System is a DCS (Distributed Control System).
Further, the liquid ammonia heat exchanger is a coil pipe type heat exchanger, and the coil pipe type heat exchanger adopts an outer finned pipe as a coil pipe.
Furthermore, an overflow outlet is formed in the position, close to the top, of the side wall of the evaporator body, and a drain pipe is arranged at the bottom of the evaporator body.
Further, the guide vanes and the inner wall of the mixer body form an included angle, and the included angle ranges from 60 degrees to 90 degrees.
Further, the axial spacing between adjacent guide vanes is equal, and is 0.45 to 0.65 times the width or diameter of the mixer body.
Further, the axial spacing between the guide vanes closest to the orifice of the ammonia gas nozzle is 7.5% to 15% of the width or diameter of the mixer body.
Further, a reference distance between two guide vanes closest to the nozzle of the ammonia gas nozzle is 0.45 to 0.65 times of the width or diameter of the mixer body; the distance between the adjacent guide vanes is sequentially increased along the injection direction of the ammonia gas nozzle, and the sequentially increased length is 10-15% of the reference distance.
Furthermore, the number of the slots of the slender groove on the single guide vane is 12 to 25; the length of the elongated slot is 5% to 8% of the width or diameter of the mixer body, and the width of the elongated slot is 1mm to 3.5 mm.
By adopting the technical scheme, the steam water bath and the electric heating water bath are jointly used as liquid ammonia evaporation means, so that the steam water bath and the electric heating water bath can be mutually standby, the stable supply of gas ammonia is ensured, the steam water bath and the electric heating water bath can be simultaneously adopted, the steam water bath and the electric heating water bath supplement each other, the energy utilization rate is improved, the energy is saved, the environment is protected, and the production cost is. The guide vanes with simple structure are used for uniformly mixing air and ammonia gas, and parameters such as the inclination angle, the arrangement interval and the like of the guide vanes are reasonably set, so that a better turbulent flow effect can be obtained, the pressure drop can be effectively reduced, and the optimal balance can be obtained. In addition, the through holes arranged at the edges of the guide vanes can avoid dead angles of accessories on the inner wall of the mixer body, so that a better turbulent flow effect is obtained, impurities or liquid drops and the like can be prevented from accumulating at the mounting connection positions of the guide vanes, the automatic cleaning and clearing functions are realized, and the maintenance frequency and cost are reduced. In addition, the long and thin groove is formed, the ammonia sprayed out of the center of the mixer body can be quickly dispersed, and the uniform mixing of the ammonia and the air is facilitated.
In conclusion, the denitration ammonia gas pretreatment system can stably, safely and reliably provide the reducing agent ammonia with uniform concentration for the denitration system.
Drawings
Fig. 1 is a schematic structural arrangement diagram of a denitration ammonia gas pretreatment system in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a liquid ammonia vaporizing device according to an embodiment of the present invention.
Fig. 3 is a schematic top view of an ammonia gas and air mixing device according to an embodiment of the present invention, which has been processed in a sectional view.
Fig. 4 is a schematic side view of an ammonia gas and air mixing device according to an embodiment of the present invention, which has been partially cut away.
Fig. 5 is a schematic structural view of an ammonia gas nozzle according to an embodiment of the present invention.
Fig. 6 is a schematic sectional view taken along the line a-a in fig. 5.
Fig. 7 is a schematic cross-sectional view taken along the direction B-B in fig. 4.
Fig. 8 is a schematic structural diagram of a guide vane according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In one embodiment, as shown in fig. 1, there is provided a denitration ammonia gas pretreatment system, comprising: the liquid ammonia evaporator 100, the ammonia air mixing device 300, and the dilution air supply device 200 for supplying system air to the ammonia air mixing device, as shown, are typically one or more dilution fans.
Referring to fig. 1 and 2, a liquid ammonia vaporizing device 100 includes: an evaporator body 104 having a cavity for containing a medium W (typically warm water); a liquid ammonia heat exchanger 108 disposed within the vaporizer body 104; one end of a liquid ammonia heat exchanger 108 is connected with a liquid ammonia inlet, the other end is communicated with an ammonia gas collecting device 106 arranged in the evaporator body 104, the ammonia gas collecting device is provided with a gas ammonia outlet 105 and at least one safety release gas outlet 107, and an electric heater 102 and a steam heating and jetting device 101 are respectively arranged in the cavity; the power of the electric heater 102 is regulated and controlled by a control and regulation switch; the steam heating and spraying device 101 is connected with a steam inlet pipeline, and the steam inlet pipeline is provided with a regulating device (shown as a valve group consisting of a manual regulating valve, an automatic regulating valve and a diaphragm valve); the control regulating switch and the regulating device are both connected with a control system (not shown);
wherein, the liquid ammonia evaporation device 100 further comprises a liquid level measuring device and a medium temperature measuring device which are arranged on the evaporator body; the pressure measuring device and the ammonia gas temperature measuring device are arranged at the ammonia gas outlet; the liquid level measuring device, the medium temperature measuring device, the pressure measuring device and the ammonia gas temperature measuring device are in signal connection with the control system.
The liquid ammonia heat exchanger 108 is a coiled tube heat exchanger, and in some embodiments, to improve heat exchange efficiency, the coiled tube heat exchanger employs an outer finned tube as a coil.
An overflow outlet is arranged on the side wall of the evaporator body 104 near the top, and a drain pipe 103 is arranged at the bottom of the evaporator body 104.
The Control System is a Distributed Control System (DCS), and when the denitration and desulfurization System is configured in a main plant, the DCS is generally adopted to remotely Control each component of the processing System, and specific functions thereof are the prior art, and are not described herein again.
By the liquid ammonia evaporation device, steam is directly introduced into the water bath of the evaporator body, and water in the water bath (usually 75-85 ℃) is heated. Excessive water overflows through the overflow mouth, and coil heat exchanger submergence is in the hot water of water bath, absorbs the heat gasification of hot water and overheated, collects in gaseous ammonia collection device to through the liquid drop that gravity separation mist foam smugglied secretly, the overheated ammonia of complete gasification is carried to ammonia buffer tank.
The pneumatic stop valve is arranged at the liquid ammonia inlet of the evaporator, the temperature of a transmitter for measuring water temperature in the water bath and the temperature of the gas phase measured by the gaseous ammonia outlet temperature transmitter both exceed the set lower limit, and the liquid level switch of the gaseous ammonia collecting device does not give an alarm, the inlet stop valve is opened, and the liquid ammonia enters the evaporator to start working. The steam inlet is provided with a pneumatic regulating valve, the pneumatic regulating valve calculates the opening degree of the automatic regulating valve through DCS according to the water bath temperature, the water bath temperature is ensured to be within a set range, and the ammonia outlet is completely gasified and is above a set low-limit temperature. The evaporator will sound and light an alarm and shut off the inlet valve when any of the following alarms are present:
firstly, the temperature of the water bath is low;
the gas phase temperature at the ammonia outlet is lower than the limit;
and thirdly, the central cylinder liquid level switch gives an alarm.
Meanwhile, a safety valve is arranged at the outlet of the evaporator, so that damage caused by overpressure is prevented, and safety is guaranteed.
The water temperature is controlled in the working range (usually 75-85 ℃) set by a user through the circulation start-stop of the electric heater through automatic control. When the water level is lower than the lower limit point set by the user, the electric heater stops heating no matter the water temperature is high or low so as to prevent dry burning. The evaporator is provided with a safety valve which is diffused when the pressure is ultrahigh. When the temperature of the gas phase outlet is lower than a set value, the DCS sends an instruction, the liquid ammonia inlet cut-off valve is cut off, and liquid ammonia is prevented from overflowing from the gas phase outlet. The control mode is group control, the group control investment cost is low, the control is also well realized, and the service life of the equipment is long.
As shown in fig. 3 and 4, the denitration ammonia air mixing device includes:
the mixer comprises a mixer body 301, wherein one side of the mixer body is connected with an air inlet section 304, and the air inlet section 304 is communicated with an air inlet 308; the other side is connected with a mixed gas outlet section 306; the mixed gas outlet section 306 is communicated with a mixed gas outlet 310;
an ammonia gas nozzle 302 extending into the mixer body 301 and close to the air inlet section 304, wherein the injection direction of the ammonia gas nozzle 302 is directed to the mixed gas outlet 306, and the outlet section of the ammonia gas nozzle 303 is consistent with the axis of the mixer body 301 and is positioned at the center of the mixer body 301; as shown in fig. 4, the ammonia gas nozzle 302 includes an ammonia gas inlet section 309, an elbow connection section 307, and an ammonia gas ejection section 303, which are connected in this order. Referring to fig. 5 and 6, the end of the ammonia gas spraying section 303 has a main nozzle, and the side wall of the ammonia gas spraying section 303 is uniformly provided with a plurality of auxiliary nozzles.
A plurality of guide vanes 305 are arranged on the inner wall of the mixer body 301, and the guide vanes 305 are respectively arranged on two sides of the mixer body 301 in a staggered manner;
a through hole is formed in the edge of one side of each guide vane 305 connected with the inner wall of the mixer body 301; the edge of the guide vane 305 on the side not connected with the inner wall of the mixer body 301 is provided with a plurality of uniformly distributed long and thin grooves.
Wherein each guide vane 305 forms an angle α with the inner wall of the mixer body 301, the angle α ranging from 60 ° to 90 °, preferably 75 °.
The axial spacing between adjacent guide vanes 305 is equal, each 0.45 to 0.65 times the width or diameter of the mixer body 301. The axial spacing between the guide vanes closest to the orifice of the ammonia gas lance 302 is 7.5% to 15% of the width or diameter of the mixer body.
In other embodiments, a reference distance between two guide vanes closest to the nozzle of the ammonia gas nozzle is 0.45 to 0.65 times the width or diameter of the mixer body; the distance between the adjacent guide vanes is sequentially increased along the injection direction of the ammonia gas nozzle, and the sequentially increased length is 10-15% of the reference distance. The pressure of the injected ammonia gas, the injected air and the mixed gas of the ammonia gas and the air along the injection direction is gradually reduced, and the distance between the guide vanes is correspondingly gradually increased, so that the pressure change trend is adapted, and the overall pressure drop of the device is favorably reduced.
In other embodiments, the number of through holes is not limited to one, and is typically singular, not more than 7, and is uniformly distributed along the edge of the side where the guide vane is connected to the inner wall of the mixer body. The open area of all the through holes is 1.5 to 3.5 percent of the cross section of the inner wall. According to the calculation of simulation software, the aperture ratio does not influence the turbulent flow mixing effect, and impurities can be effectively prevented from accumulating at the joint of the guide vane and the inner wall.
With reference to fig. 7 and 8, the number of the slots of the elongated slot on the single guide vane is 12 to 25. The length of the elongated slot is 5% to 8% of the width or diameter of the mixer body, and the width of the elongated slot is 1mm to 3.5 mm. Through the slender grooves, ammonia gas, air and mixed gas of the ammonia gas and the air with the strongest pressure and the strongest wind speed in the radial central area of the mixer body can be combed, and the overall pressure drop is reduced on the basis of promoting mixing.
In other embodiments, the length of the elongated slot formed in each guide vane is inversely proportional to the distance between the guide vane and the ammonia gas nozzle. Similarly, because the pressure of the injected ammonia gas and air and the mixed gas of the ammonia gas and the air along the injection direction is gradually reduced, the length of the elongated slot is correspondingly gradually shortened, the pressure change trend is adapted, and the overall pressure drop of the device is favorably reduced.
By adopting the technical scheme, the aim of uniformly mixing air and ammonia gas can be achieved through the guide vanes with simple structures. And through the reasonable inclination angle, the arrangement interval isoparametric that sets up guide vane, can obtain better vortex effect, can effectively reduce the pressure drop again to obtain best balance. In addition, the through holes arranged at the edges of the guide vanes can avoid dead angles of accessories on the inner wall of the mixer body, so that a better turbulent flow effect is obtained, impurities or liquid drops and the like can be prevented from accumulating at the mounting connection positions of the guide vanes, the automatic cleaning and clearing functions are realized, and the maintenance frequency and cost are reduced. In addition, the long and thin groove is formed, the ammonia sprayed out of the center of the mixer body can be quickly dispersed, and the uniform mixing of the ammonia and the air is facilitated.
By using Fluent flow field simulation software and according to the structure building model described in the above embodiment, the ammonia air mixers with different specification parameters are simulated, so that a better mixing effect can be obtained, and the uniformity of the mixed gas is good. In addition, the pressure is respectively detected at the air inlet side and the mixed gas outlet side, and the pressure drop of the device described in the embodiment is reduced by 3 to 8 percent in different degrees compared with that of other existing ammonia gas-air mixers with similar specifications.
The gas ammonia outlet 105 is connected to an inlet end of an ammonia buffer tank, and an outlet end of the ammonia buffer tank is communicated with the ammonia nozzle 302 to jointly form a denitration ammonia pretreatment system.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A denitration ammonia pretreatment system, comprising:
a liquid ammonia evaporation device and an ammonia air mixing device;
the liquid ammonia evaporation device includes: an evaporator body having a cavity for receiving a medium; a liquid ammonia heat exchanger disposed in the evaporator body; one end of the liquid ammonia heat exchanger is connected with the liquid ammonia inlet, the other end of the liquid ammonia heat exchanger is communicated with an ammonia gas collecting device arranged in the evaporator body, the ammonia gas collecting device is provided with an ammonia gas outlet and at least one safety release gas outlet, and an electric heater and a steam heating and spraying device are respectively arranged in the cavity; the power of the electric heater is regulated and controlled by a control and regulation switch; the steam heating and spraying device is connected with a steam inlet pipeline, and an adjusting device is arranged on the steam inlet pipeline; the control regulating switch and the regulating device are both connected with a control system;
the ammonia air mixing device comprises: the mixer comprises a mixer body, wherein one side of the mixer body is connected with an air inlet section, and the other side of the mixer body is connected with a mixed gas outlet section; the ammonia gas spray pipe extends into the mixer body and is close to the air inlet section, the spraying direction of the ammonia gas spray pipe points to the mixed gas outlet, and the outlet section of the ammonia gas spray pipe is consistent with the axis of the mixer body and is positioned at the center of the mixer body; the inner wall of the mixer body is provided with a plurality of guide vanes which are respectively arranged on two sides of the mixer body in a staggered manner; the edge of one side of the guide vane connected with the inner wall of the mixer body is provided with at least one through hole; the edge of one side of the guide vane, which is not connected with the inner wall of the mixer body, is provided with a plurality of uniformly distributed slender grooves;
the gas ammonia outlet is connected to an inlet end of an ammonia buffer tank, and an outlet end of the ammonia buffer tank is communicated with the ammonia gas spray pipe.
2. The denitration ammonia gas pretreatment system of claim 1, further comprising a liquid level measurement device and a medium temperature measurement device disposed at the evaporator body; the pressure measuring device and the ammonia gas temperature measuring device are arranged at the ammonia gas outlet; the liquid level measuring device, the medium temperature measuring device, the pressure measuring device and the ammonia gas temperature measuring device are in signal connection with the control system.
3. The denitration ammonia gas pretreatment system of claim 1, wherein the control system is a DCS.
4. The denitration ammonia gas pretreatment system of claim 1, wherein the liquid ammonia heat exchanger is a coil tube heat exchanger, and the coil tube heat exchanger employs an outer finned tube as a coil tube.
5. The denitration ammonia gas pretreatment system of claim 1, wherein the side wall of the evaporator body is provided with an overflow outlet at a position close to the top, and the bottom of the evaporator body is provided with a drain pipe.
6. The denitration ammonia gas pretreatment system of claim 1, wherein the guide vanes each form an included angle with the inner wall of the mixer body, the included angle being in the range of 60 ° to 90 °.
7. The denitration ammonia gas pretreatment system of claim 6, wherein the axial spacing between adjacent guide vanes is equal and is 0.45 to 0.65 times the width or diameter of the mixer body.
8. The denitrated ammonia gas pretreatment system of claim 1, wherein the axial spacing between the guide vanes closest to the ammonia gas nozzle orifice is 7.5% to 15% of the width or diameter of the mixer body.
9. The denitration ammonia gas pretreatment system of claim 1, wherein a reference distance between two guide vanes nearest to the nozzle of the ammonia gas nozzle is 0.45 to 0.65 times the width or diameter of the mixer body; the distance between the adjacent guide vanes is sequentially increased along the injection direction of the ammonia gas nozzle, and the sequentially increased length is 10-15% of the reference distance.
10. The denitration ammonia gas pretreatment system of claim 1, wherein the number of the slots of the elongated slots on a single flow guide vane is 12 to 25; the length of the elongated slot is 5% to 8% of the width or diameter of the mixer body, and the width of the elongated slot is 1mm to 3.5 mm.
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| CN107126714A (en) * | 2017-07-01 | 2017-09-05 | 成都国化环保科技有限公司 | A kind of liquid ammonia evaporator for denitration device line |
| CN109224892A (en) * | 2018-09-26 | 2019-01-18 | 中国航空工业集团公司西安飞机设计研究所 | A kind of pre-mixing apparatus liquid vaporization and its mixed with air |
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| JP3388813B2 (en) * | 1993-06-28 | 2003-03-24 | 三菱重工業株式会社 | Cooling method for leak ammonia recovery equipment |
| CN1126106A (en) * | 1994-05-20 | 1996-07-10 | 奥托孔普工程承包商公司 | Method and apparatus for forming controlled vortexes and for recirculating gas |
| CN201179429Y (en) * | 2008-02-01 | 2009-01-14 | 曾永健 | Alkaline air, air mixer |
| CN103776013A (en) * | 2012-10-24 | 2014-05-07 | 中国石油化工股份有限公司 | CO boiler with ash removing function |
| CN103007558A (en) * | 2012-12-24 | 2013-04-03 | 上海建安化工设计有限公司 | Liquid ammonia evaporator |
| CN204710114U (en) * | 2015-05-04 | 2015-10-21 | 中起重工（大连）有限公司 | One direct low temperature SCR denitration device on boiler economizer |
| CN206199039U (en) * | 2016-08-10 | 2017-05-31 | 大唐环境产业集团股份有限公司 | A kind of denitration ammonia gas for pretreatment system |
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