防爆正压小屋

一、防爆仪器分析小屋应用于炼油、化工、冶金、制药及轻工业等生产中，对各种过程气体在线分析仪及各种在线水质分析仪提供现场的安全安装空间及防护。

二、 防爆仪器分析小屋产品分类及结构特点

1、 防爆仪器分析小屋分类：

隔爆型分析小屋：安装于小屋上的所有带电设备均为独立的防爆部件，如配电设备、照明设备、通风设备、分析仪等部件均已经取得防爆认证，为独立的防爆产品。

正压通风型防爆分析小屋：屋内可装非防爆分析仪及各种仪表柜，只有在防爆正压系统运行屋内形成正压后，屋内非防爆部分才能通电运行。

2、 小屋的结构：

a、 小屋主体为框架式结构，龙骨为型钢焊接而成，分内外墙板，墙板材料可为不锈钢板或碳钢喷塑，钢板厚度可根据用户要求订制。

b、 小屋内外墙之间填充阻燃保温材料（厚度由墙壁厚度决定）。

c、 小屋地板为4mm厚防滑地板，防静电处理、耐磨耐用。

d、 屋顶可根据用户要求做成平顶、人字顶、单面斜顶，并能承受500Kg/m2的受力，可带有起重用的吊环。

e、 小屋安全门带用防爆玻璃视窗、闭门器及逃生锁，可快速开启，操作灵活。根据用户要求也可增设第二道门（缓冲间）。

f、 小屋整体性能密闭、防雨、防尘、隔热，外壳防护等级为IP65。

g、 小屋外围配置可根据用户要求确定，详见配置选择表。                                                                                         3、 小屋的特点：

该防爆分析小屋主要是实现用户现场集中控制、调度指挥、工艺分析、仪表监控的防爆处理，具体其它防爆结构不可比拟的优越性。

三、 仪器分析防爆小屋，标准配置防爆分析小屋，带缓冲间防爆小屋，室内安保系统

1、 可燃气体检测器：选用检测探头和信号变送器一体化结构的产品，并带用就地报警和远传接点输出。

2、 有毒气体检测器：当样品或周围环境气体中含有有毒组分时，须设有毒气体检测报警器，要求与可燃气体检测报警器相同。

3、 微差压变送器：分析小屋根据内部体积大小安装不同数量的微差压变送器来检测分析小屋内的正压压力，将信号反馈与防爆正压控制系统，当屋内正压值降低到规定数值时，会自动切断分析小屋内非防爆电气设备电源，以实现小屋的安全可靠。

4、 声光报警器件：采用防爆警deng（旋转闪光发声型），装在屋外醒目位置，便于观察故障原因。

5、 感烟感温探测器：能够及时发现屋内高温高烟情况，并将危险信号远传控制室。

6、 室内防爆空调：可调节室内温度，具有恒温、恒湿功能。

7、 照明系统：装有防爆吸顶荧光灯，具有正常照明和应急照明功能。

8、 通风换气系统：可采用仪表风或现场安全风，通过换气过滤装置给房内提供安全可靠气源。

四、 仪器分析防爆小屋，标准配置防爆分析小屋，带缓冲间防爆小屋性质：在规定试验条件下，气体、蒸气爆炸性混合物的最小点燃电流与甲烷爆炸性混合物的最小点燃电流之比。中国规定气体、蒸气危险物质按最小点燃电流比分为ⅡA级，ⅡB级和ⅡC级。最小点燃电流比≤1.0，>0.8的为ⅡA级；≤0.8，>0.45的为ⅡB级；≤0.45的为ⅡC级。例如，乙烷、乙烯、分别为ⅡA级，ⅡB级，ⅡC级危险物质。防爆正压分析小屋用正压吹扫控制系统的功能及防爆正压小屋箱体的结构特点它的防爆原理主要是采用介质隔离点燃源的防爆措施以及形成正压保护从而达到电器防爆的目的；结构上采用上可按用户要求分别定制成箱式、琴台式和柜式结构，柜式又分为上下结构和左右结构。箱式一般采用钢板焊接而成，表面喷塑，前开门操作；琴台式和柜式其柜架采用标准型材焊接，表面喷塑，对其各接合面都经过了特殊的密封处理；前开门操作后开门维修。钢板材料一般选用GB710-88冷轧钢板.按进气方式分为持续吹扫型和泄露补偿型。持续吹扫型为不间断连续供气，正压腔内装元件的工作热量可随气路带走，具有很好的散热功能；泄露补偿型为间断性供气，正压腔有良好的密封性，耗气量小；正压吹扫控制系统保护装置齐全，只有达到规定的换气时间后， 方能自动送电，并有高、低压自动声光报警及压力下限、开门自动断电、紧急手动断电等安全联锁保护。密封性能可靠，壳体采用多重密封保护，保压时间长，节约运行费用。本小屋采用电缆沟座安装形式，用户需配备保护气体气源。产品内部可装检测仪表、分析仪表、显示仪表、低压电器、变频器、软起动器或计算机控制系统，可作为中央信号处理系统及中央控制系统。制造时，用户必须提供完整的电气系统图，控制系统内装材料清单。可多台并柜。可根据用户所提供的电气原理图生产。本产品外壳采用优质钢板焊接或不锈钢焊接成型，表面经高速抛丸后粉末静电喷塑，外形美观；防爆正压小屋有箱体和正压吹扫控制系统装置两部分组成，防爆正压小屋气源由正压吹扫控制装置进入柜体吹扫并达到安全起亚要求，当低压报警时，正压吹扫控制装置会输出信号报警，必要时会切断正压柜电源。正压小屋在正压控制系统的控制下，通入保护气体，正压腔内压力高于正压腔外的压力，形成微正压的安全小环境，从而阻止了可燃性危险气体进入正压腔内，保证内装普通仪表和电器元件的安全运行。自动控制系统主要完成换气、补气，超高压自动泄压、低压报警和低压联锁断电等高端功能

【适用范围】：

防爆仪器分析小屋应用于炼油、化工、冶金、制药及轻工业等生产中，对各种过程气体在线分析仪及各种在线水质分析仪提供现场的安全安装空间及防护。

1、 The explosion-proof instrument analysis cabin is applied in production such as oil refining, chemical engineering, metallurgy, pharmaceuticals, and light industry, providing on-site safe installation space and protection for various process gas online analyzers and online water quality analyzers.

2、 Product classification and structural characteristics of explosion-proof instrument analysis cabin

1. Classification of explosion-proof instrument analysis cabin:

Explosion proof analysis cabin: All live equipment installed on the cabin are independent explosion-proof components, such as power distribution equipment, lighting equipment, ventilation equipment, analyzers, etc., which have obtained explosion-proof certification and are independent explosion-proof products.

Positive pressure ventilation explosion-proof analysis cabin: Non explosion-proof analyzers and various instrument cabinets can be installed inside the house. Only after the positive pressure is formed in the explosion-proof positive pressure system operation room can the non explosion-proof parts of the house be powered on for operation.

2. The structure of the cabin:

a. The main body of the cabin is a frame structure, and the keel is welded with profile steel, divided into internal and external wall panels. The wall panel material can be stainless steel or carbon steel spray molding, and the thickness of the steel plate can be customized according to user requirements.

b. Fill the interior and exterior walls of the cabin with flame-retardant insulation materials (the thickness is determined by the wall thickness).

c. The floor of the cabin is 4mm thick anti slip floor, with anti-static treatment and durability.

d. The roof can be made into a flat roof, a herringbone roof, or a single sided sloping roof according to user requirements, and can withstand a force of 500Kg/m2. It can also be equipped with lifting rings for lifting and reuse.

e. The safety door of the cabin is equipped with explosion-proof glass window, door closer and escape lock, which can be opened quickly and operated flexibly. According to user requirements, a second door (buffer room) can also be added.

f. The overall performance of the cabin is airtight, rainproof, dustproof, and insulated, with an enclosure protection level of IP65.

g. The peripheral configuration of the cabin can be determined according to user requirements, as detailed in the configuration selection table. 3. Characteristics of the cabin:

The explosion-proof analysis cabin is mainly used to achieve explosion-proof processing of user on-site centralized control, scheduling command, process analysis, and instrument monitoring. Its specific advantages are incomparable to other explosion-proof structures.

3、 Instrument analysis explosion-proof cabin, standard configuration explosion-proof analysis cabin, explosion-proof cabin with buffer room, indoor security system

1. Combustible gas detector: A product with an integrated structure of detection probe and signal transmitter, and equipped with local alarm and remote transmission contact output.

2. Toxic gas detector: When the sample or surrounding gas contains toxic components, a toxic gas detection alarm must be installed, which is required to be the same as the combustible gas detection alarm.

3. Micro differential pressure transmitter: The analysis cabin installs different numbers of micro differential pressure transmitters based on the internal volume size to detect the positive pressure inside the analysis cabin. The signal is fed back to the explosion-proof positive pressure control system. When the positive pressure value inside the cabin drops to the specified value, the power supply to non explosion-proof electrical equipment inside the analysis cabin will be automatically cut off to achieve safety and reliability of the cabin.

4. Audible and visual alarm device: It adopts explosion-proof alarm deng (rotating flashing sound type) and is installed in a prominent position outside the house for easy observation of the cause of the fault.

5. Smoke and temperature detector: It can detect high temperature and smoke in the room in a timely manner, and transmit dangerous signals to the control room.

6. Indoor explosion-proof air conditioning: adjustable indoor temperature, with constant temperature and humidity functions.

7. Lighting system: Equipped with explosion-proof ceiling fluorescent lamps, with normal and emergency lighting functions.

8. Ventilation and ventilation system: Instrument air or on-site safety air can be used to provide a safe and reliable air source to the room through ventilation and filtration devices.

4、 Instrument analysis explosion-proof cabin, standard configuration explosion-proof analysis cabin, with buffer room explosion-proof cabin property: the ratio of the minimum ignition current of gas and vapor explosive mixtures to the minimum ignition current of methane explosive mixtures under specified test conditions. According to Chinese regulations, gas and vapor hazardous substances are classified into IIA, IIB, and IIC levels based on the minimum ignition current ratio. If the minimum ignition current ratio is ≤ 1.0 and>0.8, it is classified as Class IIA; ≤ 0.8,>0.45 for Class IIB; ≤ 0.45 is Grade IIC. For example, ethane and ethylene are classified as Class IIA, Class IIB, and Class IIC hazardous substances, respectively. The function of the positive pressure blowing control system used in the explosion-proof positive pressure analysis cabin and the structural characteristics of the explosion-proof positive pressure cabin box. Its explosion-proof principle mainly adopts explosion-proof measures of isolating the ignition source with medium and forming positive pressure protection to achieve the purpose of electrical explosion-proof; Structurally, it can be customized into box, piano table, and cabinet structures according to user requirements. The cabinet structure can be divided into upper and lower structures and left and right structures. The box type is generally made of welded steel plates, with a surface sprayed with plastic and a front door opening operation; The rack of the piano table and cabinet are welded with standard profiles, and the surface is sprayed with plastic. Each joint surface has undergone special sealing treatment; Front door operation and rear door maintenance. The steel plate material is generally GB710-88 cold-rolled steel plate. It is divided into continuous blowing type and leakage compensation type according to the air intake method. The continuous blowing type is a continuous gas supply, and the working heat of the components installed in the positive pressure chamber can be taken away with the gas path, which has good heat dissipation function; The leakage compensation type is intermittent gas supply, with good sealing performance in the positive pressure chamber and low gas consumption; The positive pressure blowing control system has complete protective devices. Only after the specified air change time is reached, can the power be automatically transmitted, and there are safety interlocking protections such as high and low pressure automatic audible and visual alarms, lower pressure limits, automatic power off when opening the door, and emergency manual power off. The sealing performance is reliable, and the shell adopts multiple sealing protection, with a long pressure holding time and saving operating costs. This cabin adopts a cable trench installation form, and users need to be equipped with a protective gas source. The product can be equipped with detection instruments, analysis instruments, display instruments, low-voltage electrical appliances, frequency converters, soft starters or computer control systems, and can serve as a central signal processing system and central control system. During manufacturing, the user must provide a complete electrical system diagram and a list of internal materials for the control system. Multiple cabinets can be combined. It can be produced according to the electrical schematic provided by the user. The shell of this product is formed by welding high-quality steel plates or stainless steel, and the surface is subjected to high-speed shot blasting and powder electrostatic spraying, resulting in a beautiful appearance; The explosion-proof positive pressure cabin consists of a box body and a positive pressure blowing control system device. The gas source of the explosion-proof positive pressure cabin enters the cabinet body for blowing through the positive pressure blowing control device and meets the safety requirements. When a low pressure alarm is triggered, the positive pressure blowing control device will output a signal alarm, and if necessary, the power supply of the positive pressure cabinet will be cut off. Under the control of the positive pressure control system, the positive pressure cabin is filled with protective gas, and the pressure inside the positive pressure chamber is higher than the pressure outside the positive pressure chamber, creating a safe and micro positive environment. This prevents flammable and dangerous gases from entering the positive pressure chamber, ensuring the safe operation of ordinary instruments and electrical components inside. The automatic control system mainly completes high-end functions such as air exchange and replenishment, ultra-high pressure automatic pressure relief, low pressure alarm, and low voltage interlocking power outage