First of all, we need to understand the characteristics of the first gas, figure out what is the customer's application, and what is the purpose of measuring the concentration? If the teacher of the institute wants to analyze the products in the waste incineration test, can we recommend a toxic and harmful gas detector to him? Definitely not. Because what the teacher wants to study is not whether this concentration will reach a concentration that is harmful to the human body. The purpose of the teacher is to study how the gas is produced in this incineration process, under what conditions, and its concentration change trend, and then find the corresponding solution to reduce the concentration.
Secondly, we can understand the customer's use occasion and measurement purpose, so that we can know the customer's measurement range and working condition background, and then help the customer select the model in combination with the application of the sensor.
Features:
**(HCL), YesThere is colorlessnessIrritatingSmellThe gas has strong irritation to the upper respiratory tract, and there is a mucous membrane for the eyes and **CorrosionSexualityRelative molecular weightfor 3646。Highly soluble in water, at 0, 1 volume of water can dissolve about 500 volumes of *** Its aqueous solution is commonly known as hydrochloric acid, scientific name hydrochloric acid. Hydrochloric acid is a colorless and transparent monopolymeric strong acid. Hydrochloric acid is extremely volatile, so after opening the container containing concentrated hydrochloric acid, you can see the white mist above it, which is actually a small droplet of hydrochloric acid produced by combining with water vapor in the air after volatilization. Pure hydrochloric acid is a colorless liquid, fogging in the air (due to the strong volatility of hydrochloric acid), with a pungent sour taste, and crude hydrochloric acid is yellow due to the presence of impurities ferric chloride.
**Although the gas itself is not corrosive, it is highly corrosive when exposed to water. Its aqueous solution can react with some active metal powders to release hydrogen. In case of cyanide, it can produce highly toxic hydrogen cyanide gas. **Gas is not flammable, but it can easily react with other items to produce hydrogen gas, which can lead to disasters. And *** is an acidic gas, which is harmful to the human body when it reaches a certain concentration in the airWorkshop Air Hygiene Standard: China MAC 15 mg M3; （9.2ppm）American ACGIH***TLV-C 75 mg/m3
Industrial occasions that come into contact with *** gases:
** itself is one of a kindNon-corrosive and non-flammableThe gas, but it is very soluble in water, and the aqueous solution hydrochloric acid is an inorganic strong acid solution, which is widely used in chemical industry and metallurgy, and the hydrochloric acid solution is very volatile, so it is useful to the industrial site of hydrochloric acid, and personnel will also be able to contact the first gas.
Industrial applicationsAnhydrous sulfur trioxide reacts with sulfur trioxide in the gas phase, liquid phase or gas-liquid mixture to generate chlorosulfonic acid widely used in pigments, pharmaceuticals, plastics and other industries, and silicon powder can be used to produce trichlorosilicon, the main raw material for the synthesis of polysilicon in the electronics industry, and the reaction with oxygen can produce chlorine, the raw material urgently needed in the petrochemical industry. Hydrochloric acid can produce polyaluminum chloride, an inorganic polymer coagulant, which can react with kaolin to produce purer alumina powder, which can be used to decompose phosphate rock instead of sulfuric acid to produce phosphoric acid and precipitate calcium phosphate for use in medicine, food, feed and fertilizer industries.
Organic Chemicals: Hydrochloric acid is one of the important raw materials for the preparation of organic compounds. It can also be used in the preparation of organic compounds, such as bisphenol A, a precursor to polycarbonate, as well as some catalytic adhesives.
Electronics industry:** can be used for silicon epitaxial growth, vapor phase polishing, impurity absorption, etching and clean treatment.
Metallurgical industry:Hydrochloric acid is an important use for pickling steel, which can remove rust or iron oxides from the surface of the steel. When pickling steel, you can use a hydrochloric acid solution with a concentration of 18%, pour it into a rusty or rusty place, and then rinse it with clean water to complete the pickling.
Electroplating industry: Removes rust from metal surfaces and participates in adjusting the pH value of the plating process in order to obtain a high-quality plating layer.
Water Treatment Industry:Hydrochloric acid can be used in water treatment to regulate the pH value of water, remove impurities, and improve water quality.
Daily chemical products:Make supplies such as spices, fuels, disinfectants, etc.
Waste incineration exhaust gasWaste incineration power generation, in the process of high temperature incineration of solid chlorine-containing waste, there are chlorine gas, and dioxins and other products, and harmful to people and the environment, dioxin is a typical persistent organic pollutant, with high toxicity, refractory degradation, bioaccumulation, long-distance transmission and other characteristics, as early as 1997, the International Institute of Cancer under the World Health Organization listed it as a known human carcinogen, which is harmful to human health and the ecological environment.
How to select the testing instrument
According to the characteristics of the gas, the industrial owner needs to strictly monitor the concentration of the gas, and the content of the gas in the flue gas should be strictly controlled when the exhaust gas of waste incineration is discharged to the atmosphere. As well as some chemical plants that use a large number of hydrochloric acid solutions, when discharging industrial waste gas, they also need to treat the highest content in the waste gas to meet the standards before they can be discharged.
Personnel in industrial sites carry the best gas detector, recommend the principle of electrochemistry, choose diffusion type with limited budget, consider pump type with more budget, and can be equipped with oxygen, flammability, etc., to ensure the safety of personnel more efficiently and quickly.
If it is to measure the first gas in the industrial exhaust gas, the temperature and humidity of the gas in the pipeline should be considered, and if it is a high temperature and high humidity environment, the gas water content is large. Assuming that the manufacturer adopts a high-temperature heat tracing sampling scheme and a sensor cold-dry analysis, then the sample gas enters the sampling pipeline, and condensate will be formed after cooling, and it is easily soluble in water, and the concentration value measured by the detector is not the real value in the pipeline. It is recommended to use a pretreatment solution that can withstand high temperatures, such as a 200 degree Celsius TDLAS detector or a Fourier transform infrared analyzer.
If it is a low humidity environment at room temperature and pressure, and the loss of dissolved in water is not much, then no heat tracing sampling can be used, and the sample gas can be detected by simple filtration.
Special Considerations:
Firefighters need to pay special attention when they go to the scene to extinguish the fire: firefighters must wear full-body protective clothing, close the valve of the cylinder in the fire scene, weaken the fire, and use water spray to protect the personnel who close the valve. Spray water to cool the container and, if possible, move the container away from the fire to an open area.
Precautions for fire extinguishing: Firefighters must wear oxygen respirators and full-body protective clothing. Neutralize with alkaline substances such as sodium bicarbonate, sodium carbonate, and slaked lime.