I. Overview
Explosion-proof analysis cabins originated in the last century, and they rarely spread to general manufacturers when they first appeared. However, due to frequent safety accidents in recent years, safety has risen to national strategies, and explosion-proof analysis huts have also been greatly developed. More and more manufacturers are purchasing explosion-proof huts for safe production. Zhengzhou Hualong Explosion-proof Electric Co., Ltd. is a domestic limited company. Several of the manufacturers with explosion-proof huts qualified certificates, determined to do the first explosion of the Central Plains. The following is a detailed introduction to the technical requirements of explosion-proof cabins.
The explosion-proof analysis cabin integrates industrial online instrumentation, complete sets, and installation, and is first widely used in oil refineries and chemical companies. The standardized and professional design of the on-site analysis room makes the on-site installation and maintenance of the meter more convenient, and provides the instrument with a good operating and operating environment, and has been increasingly applied in the process device. There are two types of series analysis huts produced by our company. One is a explosion-proof and explosion-proof hut and it is equipped with explosion-proof electrical parts. Such as explosion-proof distribution box, explosion-proof junction box, explosion-proof lighting, explosion-proof fan, explosion-proof air-conditioning, explosion-proof power supply repair box, explosion-proof combustible gas detector (H2), explosion-proof toxic gas detector, explosion-proof oxygen gas detector lamp. The advantage of this kind of cabin is that the price is a little cheaper, but the explosion-proof form is not as good as the positive pressure type, and the ventilation and heat dissipation effect is general. The other is the positive pressure explosion-proof analysis cabin, which uses forced air positive pressure explosion-proof method to prevent the explosion risk caused by internal release of flammable gas and external explosive environment. The analysis cabin adopts a steel structure in which the inner and outer walls are steel plates and the middle is a heat insulation layer. The analysis hut is suitable for the explosive environment of Type II Zone 1 or Zone 2 in petroleum, chemical and other industries. The following highlights the technical requirements for positive pressure explosion proof analysis huts
Second, the composition of the system
On-line explosion-proof analysis room is widely applicable to pharmaceutical, metallurgy, chemical, textile, oil refining and other industries. It is an explosion-proof industrial product that can be used in hazardous areas such as Zone I and Zone II. As long as the site provides electricity and gas, the online instrument is It can work safely, stably, and reliably in dangerous places. At the same time, the staff who perform operations in the analysis room can also get safety protection.
The system consists of six parts:
A Main body of the analysis room (double-layered structure, filled with thermal insulation and fireproof material in the middle. The door of the hut is made of stainless steel plate, rubber sealing strip is set between the door and the wall. Dampening limit door closer and push rod escape on the door. Locks, hole locks and handles outside the door, tempered glass window on the door, explosion-proof sandwich insulation structure, door width 900, door height 200. The cabin is divided into inner and outer walls, the outer wall and the roof are made of 1.5mm stainless steel plate bending docking group Welding, internal walls and roofs are made of 1.2mm stainless steel plate bending butt welds, 75mm thick flame-retardant rock wool insulation material is filled between the inside and outside walls and between the ceiling and the roof, and the interior walls are made of stainless steel, and the outer wall is painted with anti-corrosion paint. In the buffer room, the door is open to the inside of the buffer room. There are 800 wide rain guards and two sets of cylinder brackets outside the house.)
B indoor hazardous gas concentration monitoring system, including explosion-proof combustible gas detector (H2), explosion-proof toxic gas detector, explosion-proof oxygen gas detector lamp, etc.
C sound and light alarm interlock system: sound and light alarm, with emergency explosion-proof anti-corrosion plastic fluorescent lamps.
D Instrument Power System Analytical Instrumentation
E Utility Power System for Lighting Distribution
F UPS emergency power supply for emergency use
Third, the use of conditions
1 Scope of application:
1) Humidity: Relative humidity is not more than 90%
2) Indoor environment temperature: 0°C~+45°C
3) Analyze the indoor temperature According to the requirements of the interior analysis instrument, take the heating or air conditioning measures.
4) The entrance to the analysis duct should be in a non-hazardous area.
5) Altitude: no more than 3000m
2 Installation and use conditions:
1) Ambient temperature: -30°C~40°C
2) Altitude: < 3000m
3) Power Supply: AC220±20% 50Hz
4) Atmospheric pressure: 50 KPa-- 106 KPa
5) No strong vibration
IV. Structure and main technical parameters
1 Cabin structure: Using internal and external steel structures, the analysis instrument, pretreatment, and control unit are assembled in the analysis room and the analysis room is installed near the site. The sampling probe is installed before the outdoor decompression station. The main body of the analysis room adopts internal and external steel structure, inside and outside are cold-rolled (or stainless steel) steel plate, the base adopts No. 10 channel steel, surrounded by keel square steel structure, the inner and outer plates are sprayed, the middle sandwich is 75mm thick, and the middle is filled with flame retardant. , insulation, insulation materials. Explosion-proof air conditioners are installed indoors to adjust the room temperature. The power distribution system is a pipeline system with an explosion-proof distribution box. The lighting system uses explosion-proof emergency fluorescent lamps. The analysis room also has ventilation, ventilation, and filtration devices. Single door structure with glass window and escape door lock. Using special processing techniques, all achieve sealing, anti-corrosion, dust-proof, temperature control and other functions.
2 main technical parameters:
A: Explosion-proof grade: ExdIIBT4~ExdIICT6, the production grade is determined according to the user's requirements.
B: Protection level: ≥IP56E: Internal pressure normal value: 30 -100Pa
C: Acousto-optic alarm when the indoor concentration exceeds the limit (25% LEL)
D: Power supply: 220VAC ± 10%, 50Hz, 20A
3 main technical features:
The whole explosion-proof function.
High quality alarm signal output (DCS)
Dustproof and waterproof
Completely closed system creates the safest environment for on-site analysis.
The entire ground, ground resistance <4Ω.
Anti-static, fire protection function.
Anti-vibration function.
Isolate the environmental pollution function.
Constant temperature, constant humidity function.
Anti-corrosion function, anti-site interference.
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