CN210322970U - Sintering circulation flue gas simulation system - Google Patents
Sintering circulation flue gas simulation system Download PDFInfo
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Abstract
The utility model discloses a sintering circulation flue gas analog system belongs to sintering circulation flue gas experiment field. The system comprises a dry waste gas generating unit, a steam generating unit, a flue gas generating unit and a sintering cup; outlets of the dry waste gas generating unit and the steam generating unit are sequentially communicated with the wet waste gas mixer, the wet waste gas heater and the smoke generating unit through conveying pipes; the flue gas generating unit is provided with an air inlet and a flue gas outlet, and the flue gas outlet is provided with a sintering cup. The system can simulate sintering flue gas in sintering production, and the system is used for iron ore sintering tests and detection of sintering process and quality, so that the problem that the sintering quality is reduced and loss is caused when the technology is directly used for sintering production is avoided.
Description
Technical Field
The utility model belongs to sintering flue gas experiment field, more specifically say, relate to a sintering circulation flue gas analog system.
Background
The sintering flue gas circulation technology is the most effective technology for utilizing sensible heat and latent heat in the sintering flue gas and is also the comprehensive treatment (controlling NOx and SO) of the sintering flue gas2And emission of pollutants such as dioxin) are the most practical methods. The method is mainly characterized in that part of sintering flue gas is returned to a sintering machine through a circulating flue to participate in sintering again, most of nitric oxide and dioxin are cracked by using high temperature in the sintering process, and SO in the flue gas2Enrichment, reduction desulfurization flue gas handling capacity and cost, simultaneously, the absorption utilizes the heat energy in the flue gas, reduces the sintering energy consumption.
Before the sintering flue gas circulation technology is applied to actual sintering production, the influence of the flue gas which participates in sintering again on the sintering production needs to be detected, and the influence on the sintering production work when the flue gas circulation technology is directly applied is avoided. Therefore, the effect of sintering flue gas on sintering production needs to be simulated in a laboratory.
However, the sintering flue gas contains O2、N2、CO2、CO、NOx、SO2、H2The composition of various gases such as O and the like is complex, and the smoke components, the temperature and the gas quantity at each bellows and the large flue are different, which brings great difficulty for the simulation test research of the technology under the laboratory condition. At present, from the source of sintering flue gas, three modes of adopting actual flue gas, steel cylinder gas distribution simulation flue gas and combustion natural gas (or methane) simulation flue gas and the like are mainly adopted. The actual flue gas generated in the experimental process of the sintering cup is different from that of a sintering machine, the flue gas composition and the temperature of the flue gas change along with the change of the sintering process, and the relative stability of the flue gas is completely different from that of the sintering circulating flue gas, so that the mode of adopting the actual flue gas is not suitable for laboratory research. Although the method for distributing the gas in the steel cylinder can accurately control the components of the simulated flue gas, the consumption of the gas in the steel cylinder is large (especially CO) because the flue gas required by a large-scale sintering cup test is large2) And the test cost is high. The combustion of natural gas (or methane) can provide a large amount of CO2And H2O, but the smoke component fluctuation is large, and the control difficulty is large. In addition, the matching problem of the air permeability of the sinter bed and the supplied smoke volume is not considered in the two modes, and the sinter bed is in a state of being lack of air supply or forced air supply, and both the sinter bed and the sinter bed have adverse effects on sintering production.
In the prior art, there are also devices and experiments for flue gas simulation.
For example, the Chinese patent application number is: CN201210115569.3, published date: the 2016 patent document, 10 months and 12 days, discloses a comprehensive experimental device for simultaneously desulfurizing and denitrating flue gas and an operation method thereof. The device generates flue gas through a blower and a standard gas cylinder simulation, but the device does not worry about a large amount of moisture and heat contained in actual sintering flue gas.
Also, for example, the Chinese patent application number is: CN201610732613.3, published date: patent literature 2/15/2017 discloses a device and a method for detecting performance of an isometric medium-sized flue gas denitration catalyst. The Chinese patent application numbers are: CN201510357366.9, published date: patent literature on 10/7/2015 discloses a full-size flue gas denitration catalyst performance detection device and a detection method. The Chinese patent application numbers are: CN201710793686.8, published date: patent literature 11/28/2017 discloses a performance pilot plant for an SCR denitration catalyst.
The latter three devices all relate to a flue gas simulation link, but the flue gas simulation of the latter three devices is for detecting the performance of the denitration catalyst of the flue gas, the devices and the methods do not relate to the actual operation condition of a sintering production field, and cannot be used for detecting the influence of the sintering circulation flue gas on the sintering production, and no simulation experiment device and method aiming at the sintering circulation flue gas are available in the market.
SUMMERY OF THE UTILITY MODEL
1. Problems to be solved
To the problem of current flue gas analogue means and method be not applicable to the influence of detection sintering circulation flue gas to sintering quality, the utility model provides a sintering circulation flue gas analogue system, the sintering circulation flue gas in the sintering production can be simulated to this system, detects out the influence to sintering quality when different sintering circulation flue gases are used for sintering production technology, reduces sintering quality when avoiding directly being used for sintering production with this technique, causes the loss.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A sintering circulation flue gas simulation system comprises a dry waste gas generation unit, a steam generation unit and a flue gas generation unit; outlets of the dry waste gas generating unit and the steam generating unit are sequentially communicated with the wet waste gas mixer, the wet waste gas heater and the smoke generating unit through conveying pipes; the smoke generating unit is provided with an air inlet and a smoke outlet and is used for simulating the generation of smoke.
Further, the dry waste gas generating unit comprises a standard gas cylinder group, a carbon dioxide generator, a dry waste gas mixer and a dry waste gas heater; outlets of the standard gas cylinder group and the carbon dioxide generator are both communicated with an inlet of a dry waste gas mixer, an outlet of the dry waste gas mixer is communicated with an inlet of a dry waste gas heater, and an outlet of the dry waste gas heater is communicated with an inlet of a wet waste gas mixer through a conveying pipe; the standard gas cylinder group comprises a nitrogen gas cylinder, a carbon monoxide gas cylinder, a sulfur dioxide gas cylinder, a nitric oxide gas cylinder and a nitrogen dioxide gas cylinder.
Further, the carbon dioxide generator comprises a high temperature vacuum atmosphere furnace; the furnace gas inlet of the high-temperature vacuum atmosphere furnace is of a closed structure, and the furnace gas outlet of the high-temperature vacuum atmosphere furnace is communicated with the dry waste gas mixer.
Further, the steam generating unit includes a steam generator and a steam heater; a water inlet pipeline of the steam generator is connected with a water source, and an air outlet of the steam generator is communicated with an inlet of the steam heater; and the outlet of the steam heater is communicated with the wet waste gas mixer through a conveying pipe.
Further, the flue gas generation unit comprises a flow guide pipe; the outlet of the conveying pipe is provided with a distributor which is of an annular structure, is sleeved on the flow guide pipe and is communicated with the flow guide pipe through a plurality of air pipes.
Furthermore, the lower part of the flow guide pipe is provided with a flow sensor, the outlets of the standard gas cylinder group and the carbon dioxide generator are provided with a gas flow controller group, and the water inlet pipeline of the steam generator is provided with a liquid flow controller.
Further, the conveying pipe, the distributor and the flow guide pipe all have a heat tracing function.
A sintering circulation flue gas simulation test method adopts the sintering circulation flue gas simulation system to carry out tests, and comprises the following steps:
firstly, setting a calcining temperature, a preheating temperature, a flue gas temperature and flue gas components according to experiment requirements before an experiment begins, wherein the flue gas comprises dry flue gas and water vapor;
controlling a high-temperature vacuum atmosphere furnace to heat to a calcining temperature, controlling a dry waste gas heater and a steam heater to heat to a preheating temperature, and controlling a wet waste gas heater, an air heater, a conveying pipe and a guide pipe to heat to a smoke temperature;
thirdly, after the sintering cup is ignited, the outlet of the flow guide pipe is aligned to the charge level of the sintering cup, and the air inlet of the flow guide pipe sucks air and heats the air;
measuring the gas flow in the guide pipe through a flow sensor, calculating the flow of each gas component in the dry waste gas generating unit and the steam generating unit according to the measured gas flow and the set smoke components, and adjusting the indicating values of a gas flow controller group and a liquid flow controller by taking the flow as a target;
adding limestone into a high-temperature vacuum atmosphere furnace, calcining to generate carbon dioxide, mixing the carbon dioxide with each component gas generated by a standard gas cylinder group to form dry waste gas, heating the dry waste gas by a dry waste gas heater, then feeding the dry waste gas into a conveying pipe, simultaneously generating steam by a steam generator, heating the steam by a steam heater, then feeding the steam into the conveying pipe, and mixing the steam with the dry waste gas to form wet waste gas;
sixthly, after the wet waste gas is heated by the wet waste gas heater, the wet waste gas is sent into the flow guide pipe to be mixed with the air heated by the air heater, so as to form simulated flue gas, and the simulated flue gas enters the sintering cup through the outlet of the flow guide pipe;
and seventhly, detecting the influence of the simulated smoke on the sintering process and quality of the sintering material in the sintering cup.
Further, in the second step, the preset flue gas includes dry flue gas and water vapor, and the specific calculation process of each gas component in the dry waste gas generation unit and the steam generation unit is as follows:
QCO＝Qcigarette with heating means×CCO÷100×1000÷60；
QNO＝QCigarette with heating means×CNO÷100×1000÷60；
Wherein Q isCigarette with heating meansA gas flow measured for a flow sensor;
Further, the temperature of the flue gas is 200-250 ℃; the preheating temperature is 150-200 ℃; the calcination temperature is 1000-1100 ℃.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) a sintering circulation flue gas simulation system generates each gas component in sintering flue gas through a dry waste gas generation unit and a steam simulation unit, mixes the gas components with a certain amount of air and simulates sintering flue gas generated during sintering of a sintering machine, and introduces the flue gas into a sintering cup for detection, so that the influence of a sintering circulation flue gas technology on the sintering quality of iron ore can be detected, and the adverse effect which may be caused when the technology is directly used for sintering production is prevented;
(2) a sintering circulation flue gas simulation system is characterized in that an independent carbon dioxide generator is arranged outside a standard gas cylinder group according to a test condition that the amount of carbon dioxide required to be generated is large, so that the large amount of generated carbon dioxide is met, if a carbon dioxide gas cylinder is adopted, on one hand, the cost is too high, on the other hand, the replacement frequency of the gas cylinder is large, and the gas cylinder is inconvenient, and if combustion gas fuel is adopted, on the one hand, the produced carbon dioxide contains a large amount of impurities, on the other hand, the generated carbon dioxide has poor stability and is difficult to control;
(3) a sintering circulation flue gas simulation system adopts a high-temperature vacuum atmosphere furnace as a carbon dioxide generator, can generate carbon dioxide with extremely high purity in a high-temperature calcination mode, blocks an air inlet of the high-temperature vacuum atmosphere furnace, and greatly enhances the sealing property when the carbon dioxide is generated and improves the purity of the generated gas by matching with the good sealing property of the high-temperature vacuum atmosphere furnace;
(4) a sintering circulation flue gas simulation system is characterized in that a distributor is arranged at an outlet of a conveying pipe, wet waste gas in the conveying pipe can be uniformly divided into a plurality of groups of gas flows to enter a flow guide pipe to be fully mixed with gas in the flow guide pipe, the mixing degree and the mixing speed of the wet waste gas and air are greatly enhanced, and the quality of simulated flue gas is improved;
(5) a sintering circulation flue gas simulation system is provided, wherein a flow sensor is arranged at the lower part of a flow guide pipe, flow controllers are arranged in a dry waste gas generation unit and a steam generation unit, and after the flow of each flue gas component is calculated according to set flue gas components and the detected air flow in the flow guide pipe, the generation amount of each gas component can be accurately controlled through the flow controllers, so that the authenticity of simulated sintering flue gas is ensured;
(6) a sintering circulation flue gas simulation system is provided, wherein a conveying pipe, a distributor and a guide pipe of the system have heat tracing functions and can effectively keep the temperature of gas, so that the temperature of the gas is prevented from being reduced when the gas flows in a pipeline, the temperature of the simulated flue gas is inconsistent with the temperature of the real sintering flue gas, and the authenticity of the simulated flue gas is influenced;
(7) a sintering circulating flue gas simulation test method adopts the simulation system to perform an experiment on the influence of sintering circulating flue gas on the sintering production process and the sintering quality, can accurately simulate the flue gas components in the sintering production, and detects the influence of the sintering flue gas on the sintering material layer to participate in sintering again, so that the reduction of the sintering quality and the loss caused by the sintering flue gas circulation technology applied to the sintering production are avoided.
Drawings
FIG. 1 is a schematic flow diagram of a simulation system;
FIG. 2 is a schematic view of the dispenser;
in the figure:
10. a dry exhaust gas generation unit; 11. a standard gas cylinder group; 111. a nitrogen gas cylinder; 112. a carbon monoxide gas cylinder; 113. a sulfur dioxide gas cylinder; 114. a nitric oxide gas cylinder; 115. a nitrogen dioxide cylinder; 12. a carbon dioxide generator; 121. a high temperature vacuum atmosphere furnace; 1211. a furnace inlet; 1212. a furnace gas outlet; 122. limestone; 13. a gas flow controller group; 14. a dry exhaust gas mixer; 15. a dry exhaust gas heater;
20. a steam generation unit; 21. a water source; 22. a liquid flow controller; 23. a steam generator; 24. a steam heater;
30. a delivery pipe;
40. a wet exhaust gas mixer;
50. a wet exhaust gas heater;
60. a dispenser; 61. an air duct;
70. a flue gas generation unit; 71. an air heater; 72. a flow guide pipe; 73. a flow sensor; 74. an expansion tube;
80. and (4) sintering the cup.
Detailed Description
The invention will be further described with reference to specific embodiments and drawings.
Example 1
The sintering flue gas circulation technology is an effective method for treating sintering flue gas and utilizing heat energy in sintering production, but when a new technology is applied to actual production, the actual use process and effect of the technology are usually firstly simulated and detected, so that the problem that the sintering production cannot be timely treated when the technology is directly applied to the actual production is avoided, and the quality of the sintering production is influenced. At present, no analog detection device specially aiming at the technology exists in the market, and the embodiment provides a solution for the problem.
As shown in fig. 1, a sintering circulation flue gas simulation system is used for simulating sintering flue gas generated during actual sintering production and detecting the influence of sintering flue gas participating in sintering again on sintering production. The device mainly comprises a dry waste gas generating unit 10, a steam generating unit 20, a smoke generating unit 70 and a sintering cup 80, wherein the dry waste gas generating unit 10 is used for simulating sintering smoke, the outlets of the dry waste gas generating unit 10 and the steam generating unit 20 are sequentially communicated with a wet waste gas mixer 40, a wet waste gas heater 50 and the smoke generating unit 70 through a conveying pipe 30, and the smoke outlet of the smoke generating unit 70 is provided with the sintering cup 80. The specific structure and operation of each unit will be described in detail below.
The dry exhaust gas generation unit 10 includes a standard gas cylinder group 11, a carbon dioxide generator 12, a dry exhaust gas mixer 14, and a dry exhaust gas heater 15.
The standard gas cylinder group 11 is composed of existing standard gas cylinders and is used for generating various gases in simulated flue gas components, and the standard gas cylinders include a nitrogen gas cylinder 111, a carbon monoxide gas cylinder 112, a sulfur dioxide gas cylinder 113, a nitrogen monoxide gas cylinder 114 and a nitrogen dioxide gas cylinder 115 which respectively correspond to nitrogen, carbon monoxide, sulfur dioxide, nitrogen monoxide and nitrogen dioxide gases in sintering flue gas. Utility model people have also considered directly adopting the carbon dioxide gas cylinder as the generator of carbon dioxide, but discover in the experiment that the consumption of carbon dioxide is great, and the standard gas cylinder is difficult to last to provide sufficient carbon dioxide on the one hand, and on the other hand adopts the cost that the standard gas cylinder generated carbon dioxide to be too high. Therefore, in the present embodiment, the carbon dioxide generator 12 is separately provided outside the standard gas cylinder group 11.
The carbon dioxide generator 12 uses a high-temperature vacuum atmosphere furnace 121 as a generator of carbon dioxide, and has good sealing property. By adding limestone 122 to the furnace and calcining the limestone 122, relatively pure carbon dioxide can be generated. In addition, in the embodiment, the furnace inlet 1211 of the high temperature vacuum atmosphere furnace 121 is set to be in a normally closed state, so that the generated carbon dioxide is only conveyed out from the furnace outlet 1212, thereby further enhancing the sealing property of the high temperature vacuum atmosphere furnace 121, preventing the mixing of the external air, and improving the purity of the carbon dioxide.
The outlets of the gas cylinders in the standard gas cylinder group 11 and the outlet of the carbon dioxide generator 12 are communicated with the dry waste gas mixer 14 through pipelines, the outlet of the dry waste gas mixer 14 is communicated with the dry waste gas heater 15 through a pipeline, and the outlet of the dry waste gas heater 15 is communicated with the wet waste gas mixer 40 through the conveying pipe 30. After the various gases are generated, the gases are sufficiently mixed in the dry exhaust gas mixer 14 to form dry exhaust gas, and then the dry exhaust gas enters the dry exhaust gas heater 15 to be heated to a set temperature, and then the dry exhaust gas enters the wet exhaust gas mixer 40.
The steam generating unit 20 includes a steam generator 23 and a steam heater 24. Wherein, the water inlet pipe of the steam generator 23 is connected with the water source 21, the air outlet thereof is communicated with the inlet of the steam heater 24, and the outlet of the steam heater 24 is communicated with the wet waste gas mixer 40 through the conveying pipe 30. The steam is generated by the steam generator 23, heated to a predetermined temperature by the steam heater 24, and then introduced into the wet exhaust gas mixer 40.
The heated dry exhaust gas and the steam are mixed in the wet exhaust gas mixer 40, and then enter the wet exhaust gas heater 50 through the duct 30 to be heated to a set temperature, and then enter the duct of the flue gas generating unit 70 through the duct 30 again.
The flue gas generating unit 70 includes an air heater 71 and a duct 72, and the air heater 71 is installed at an air inlet of the duct 72 for heating air entering the duct 72. The outlet of the delivery pipe 30 is communicated with the draft tube 72, and the communication position of the delivery pipe needs to be positioned at the lower part of the air heater 71, so that the wet waste gas can be smoothly mixed with the heated air after entering the draft tube 72 to form simulated smoke. And finally, the simulated flue gas is sprayed out from the flue gas outlet of the guide pipe 72 and enters the charge level of the sintering cup 80 positioned at the flue gas outlet of the guide pipe 72, and the sintering quality is detected. In order to enhance the uniformity of the simulated flue gas entering the sintering burden surface, the expansion pipe 74 is arranged at the flue gas outlet of the draft tube 72, and the diameter of the expansion pipe 74 is gradually increased along the flowing direction of the simulated flue gas, so that the contact area between the sprayed flue gas and the burden surface is increased, and the contact with the burden surface is more sufficient and uniform.
In order to increase the degree of mixing of the wet exhaust gas with the air, the present embodiment is provided with a distributor 60 at the outlet of the duct 30. As shown in fig. 2, the distributor 60 is an annular structure, which is sleeved on the draft tube 72, and a plurality of air pipes 61 communicating the distributor 60 and the draft tube 72 are uniformly arranged along the circumferential direction of the distributor 60, the number of the air pipes 61 is determined according to the actual test condition, and is 4 in this embodiment. After the wet waste gas enters the distributor 60 from the conveying pipe 30, the wet waste gas can be uniformly distributed to the 4 air pipes 61, enters the guide pipe 72 from multiple directions through the 4 air pipes 61, and has an opposite impact effect with the air in the guide pipe 72 to form a cyclone, so that the mixing degree of the air and the wet waste gas is enhanced, and the quality of simulated smoke is improved.
In order to accurately control the delivery flow of various gases, the accuracy of the finally formed simulated smoke components is ensured. In this embodiment, a flow sensor 73 is installed at the lower portion of the draft tube 72 for detecting the gas flow rate at the lower portion of the draft tube 72. In a matching manner, a gas flow controller is respectively arranged at the outlet of each gas cylinder of the standard gas cylinder group 11, and a gas flow controller is also arranged at the outlet of the carbon dioxide generator 12, so that the gas flow controller group 13 shown in fig. 1 is formed in a combined manner. Meanwhile, a liquid flow controller 22 is installed on a water inlet pipe of the steam generator 23 (or a gas flow controller may be installed on a water outlet pipe of the steam generator 23). The flow parameters of each group of gas are calculated by detecting the gas flow at the lower part of the guide pipe 72 and the set smoke components, and then are accurately controlled by each flow controller, so that the concentration of the finally formed components of the simulated smoke is accurate, and the simulation authenticity is improved.
In addition, the authenticity of the simulated flue gas is not only seen in the accuracy of the component concentrations of the flue gas, but also the temperature of the flue gas is an important parameter. Although each gas is heated to the set flue gas temperature through a plurality of heaters, when the flue gas circulates in the pipeline, the flue gas can exchange heat with the pipeline, so that the temperature is reduced, and the authenticity of the generated simulated flue gas is influenced. Therefore, the delivery pipe 30, the distributor 60 and the draft tube 72 of the present embodiment all employ heat tracing pipes, and the temperature of the heat tracing pipes is heated to the set smoke temperature, so that the heat loss of the gas during flowing can be effectively prevented, and the authenticity of the generated simulated smoke is improved.
In conclusion, the sintering circulation flue gas simulation system of this embodiment can simulate out the sintering flue gas that the authenticity is high, detects out the influence of sintering circulation flue gas technique to iron ore sintering quality, prevents to use this technique directly in adverse effect that probably causes when sintering production. In particular, the simulated smoke has more participation of outside air, so that the amount of various gases to be generated is greatly reduced, and the cost is saved.
Example 2
A sintering circulation flue gas simulation test method adopts the sintering circulation flue gas simulation system in the embodiment 1, sintering flue gas can be simulated, influence of sintering flue gas on sintering production is detected, it needs to be explained that various devices in the simulation system are automatically controlled through a control device, and specific connection relation between the control device and each device in the simulation system belongs to the common prior art in the field, and detailed description is not provided herein. The test method of this example includes the following steps:
firstly, before an experiment is started, smoke components and three temperatures are set according to actual experiment requirements: flue gas temperature, calcination temperature, and preheat temperature. Wherein the temperature of the flue gas is 200-250 ℃, and the temperature is 210 ℃ in the embodiment; the calcination temperature is 1000-1100 ℃, and 1059 ℃ is adopted in the embodiment; the preheating temperature is 150-200 ℃, and 160 ℃ is adopted in the embodiment; the smoke composition values of this example are shown in Table 1 below.
TABLE 1
It should be noted that, as shown in table 1, the smoke of the present embodiment is divided into dry smoke and water vapor, and in table 1, N2、O2、CO2、CO、SO2、NO、NO2The concentration of (A) is the concentration of the volume of the (B) in the volume of dry flue gas, the sum of the concentrations is 100%, and during actual sintering, NO is added2The content of (b) is extremely small, and hence 0 is taken here; h2The concentration of O is the concentration of its volume relative to the volume of the wet flue gas.
The precise values of the flue gas temperature, the calcination temperature and the preheating temperature are all required to be set according to experimental conditions, and usually do not exceed the range values given above, and the precise temperatures only represent the temperatures adopted in the embodiment.
Secondly, controlling the high-temperature vacuum atmosphere furnace 121 to be heated to a set calcining temperature, controlling the dry waste gas heater 15 and the steam heater 24 to be heated to a set preheating temperature, and controlling the wet waste gas heater 50, the air heater 71, the conveying pipe 30, the distributor 60 and the guide pipe 72 to be heated to a set flue gas temperature;
and thirdly, moving the smoke generating unit 70 to the upper part of the sintering cup 80, igniting the sintering cup 80, aligning the outlet of the flow guide pipe 72 with the charge level of the sintering cup 80, and under the action of negative pressure of sintering draft, air enters the flow guide pipe 72 from the air inlet at the upper end of the flow guide pipe 72, and the air heater 71 heats the air when the air passes through the air heater 71.
Fourthly, measuring the gas flow flowing in the draft tube 72 through the flow sensor 73, calculating the flow of each gas component in the dry waste gas generating unit 10 and the steam generating unit 20 according to the measured gas flow and the set smoke components, and adjusting the indication values of the gas flow controller group 13 and the liquid flow controller 22 by taking the calculated flow as a target to accurately control the generated flow of each gas component, wherein the specific calculation process is shown as the following formula:
QCO＝Qcigarette with heating means×CCO÷100×1000÷60；
QNO＝QCigarette with heating means×CNO÷100×1000÷60；
Wherein Q isCigarette with heating meansIs the gas flow measured by the flow sensor 73;
It should be noted that, if a gas flow controller is installed on the outlet pipe of the steam generator 23, the indication value on the gas flow controller is the calculated value of the steam flow in the above formula; if the liquid flow controller 22 is installed on the water inlet pipe of the steam generator 23, the indication value of the liquid flow controller 22 needs to convert the calculated value of the steam flow into a conversion formula:
gas flow rate Q detected by flow sensor 73Cigarette with heating meansIs 53.2 Nm3The gas flow rates for each component were calculated from the/h and flue gas composition of Table 1, and the results shown in Table 2 below were obtained.
TABLE 2 Unit (L/min)
| N2 | CO2 | CO | SO2 | NO | NO2 | H2O (gas) | H2O (liquid) |
| 55.02 | 62.07 | 8.87 | 0.44 | 0.27 | 0 | 44.33 | 0.036 |
And fifthly, adding limestone 122 into the high-temperature vacuum atmosphere furnace 121, calcining at a calcining temperature to generate carbon dioxide, feeding the carbon dioxide and each component gas generated by the standard gas cylinder group 11 into a dry waste gas mixer 14 to be mixed according to a calculated flow value under the precise control of a gas flow controller group 13 to form dry waste gas, feeding the dry waste gas into a dry waste gas heater 15, heating at a preheating temperature, and then feeding the dry waste gas into a wet waste gas mixer 40 through a conveying pipe 30. Meanwhile, the water source 21 is introduced into the steam generator 23 at the calculated flow value under the precise control of the liquid flow controller 22 and generates water vapor, and then introduced into the steam heater 24, heated at a preheating temperature, and then introduced into the wet exhaust gas mixer 40 through the duct 30 to be mixed with the dry exhaust gas to form wet exhaust gas.
Sixthly, the wet waste gas generated in the fourth step enters the wet waste gas heater 50 through the delivery pipe 30, is heated at the smoke temperature, then enters the distributor 60 at the outlet of the delivery pipe 30, is uniformly divided into a plurality of groups of air flows under the action of the distributor 60, enters the guide pipe 72 in different directions to be mixed with the heated air, so as to form simulated smoke, and because the wet waste gas is divided into a plurality of groups of air flows entering the guide pipe 72 in different directions, convection can be generated between the wet waste gas and the guide pipe 72, so that cyclone can be generated, and the mixing is more sufficient. The formed simulated flue gas then enters the charge level of the sintering cup 80 through the outlet of the draft tube 72.
And seventhly, introducing the simulated smoke into the sintering cup 80, detecting the influence of the simulated smoke on the sintering quality of the sintering material in the sintering cup 80, and recording and arranging experimental data every time.
In summary, the sintering cycle flue gas simulation experiment method in this embodiment adopts the sintering cycle flue gas simulation system in embodiment 1, can accurately simulate the flue gas components in the sintering production, has high simulation authenticity, and detects the influence of the sintering flue gas used for sintering the sinter bed again, thereby avoiding the loss caused by the reduction of sintering quality when the sintering flue gas circulation technology is used for sintering production.
The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.
Claims (7)
1. A sintering circulation flue gas analog system which characterized in that: the system comprises a dry waste gas generating unit (10), a steam generating unit (20) and a flue gas generating unit (70); outlets of the dry waste gas generating unit (10) and the steam generating unit (20) are sequentially communicated with a wet waste gas mixer (40), a wet waste gas heater (50) and a smoke generating unit (70) through a conveying pipe (30); the smoke generating unit (70) is provided with an air inlet and a smoke outlet and is used for simulating the generation of smoke.
2. The sintering cycle flue gas simulation system of claim 1, wherein: the dry waste gas generating unit (10) comprises a standard gas cylinder group (11), a carbon dioxide generator (12), a dry waste gas mixer (14) and a dry waste gas heater (15); outlets of the standard gas cylinder group (11) and the carbon dioxide generator (12) are both communicated with an inlet of a dry waste gas mixer (14), an outlet of the dry waste gas mixer (14) is communicated with an inlet of a dry waste gas heater (15), and an outlet of the dry waste gas heater (15) is communicated with an inlet of a wet waste gas mixer (40) through a conveying pipe (30); the standard gas cylinder group (11) comprises a nitrogen gas cylinder (111), a carbon monoxide gas cylinder (112), a sulfur dioxide gas cylinder (113), a nitrogen monoxide gas cylinder (114) and a nitrogen dioxide gas cylinder (115).
3. The sintering cycle flue gas simulation system of claim 2, wherein: the carbon dioxide generator (12) comprises a high temperature vacuum atmosphere furnace (121); the furnace gas inlet (1211) of the high-temperature vacuum atmosphere furnace (121) is of a closed structure, and the furnace gas outlet (1212) of the high-temperature vacuum atmosphere furnace is communicated with the dry waste gas mixer (14).
4. The sintering cycle flue gas simulation system of claim 2, wherein: the steam generating unit (20) comprises a steam generator (23) and a steam heater (24); a water inlet pipeline of the steam generator (23) is connected with a water source (21), and an air outlet of the steam generator is communicated with an inlet of the steam heater (24); the outlet of the steam heater (24) is communicated with the wet waste gas mixer (40) through a conveying pipe (30).
5. The sintering cycle flue gas simulation system of claim 4, wherein: the flue gas generating unit (70) comprises a draft tube (72); the outlet of the conveying pipe (30) is provided with a distributor (60), the distributor (60) is of an annular structure, is sleeved on the guide pipe (72) and is communicated with the guide pipe (72) through a plurality of air pipes (61).
6. The sintering cycle flue gas simulation system of claim 5, wherein: the lower part of the draft tube (72) is provided with a flow sensor (73), the outlets of the standard gas cylinder group (11) and the carbon dioxide generator (12) are provided with a gas flow controller group (13), and the water inlet pipeline of the steam generator (23) is provided with a liquid flow controller (22).
7. A sintering cycle flue gas simulation system according to claim 5 or 6, wherein: the conveying pipe (30), the distributor (60) and the guide pipe (72) have heat tracing functions.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333326A (en) * | 2019-08-07 | 2019-10-15 | 马鞍山钢铁股份有限公司 | A kind of sintering circulating flue gas simulation system and experimental method |
| CN115372046A (en) * | 2022-10-25 | 2022-11-22 | 佛山市顺德区美的洗涤电器制造有限公司 | Stable releasing device for simulating oil fume |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333326A (en) * | 2019-08-07 | 2019-10-15 | 马鞍山钢铁股份有限公司 | A kind of sintering circulating flue gas simulation system and experimental method |
| CN110333326B (en) * | 2019-08-07 | 2024-04-16 | 马鞍山钢铁股份有限公司 | Sintering circulation flue gas simulation system and experimental method |
| CN115372046A (en) * | 2022-10-25 | 2022-11-22 | 佛山市顺德区美的洗涤电器制造有限公司 | Stable releasing device for simulating oil fume |
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