Explosion-proof Quartz Sand Filter,activity Carbon Filter Teo Stage Reverse Osmosis Dosing Water tank Fully Automatic System

Short Description:

Equipment brand:WZHDN-Wenzhou Haideneng

Equipment company:Wenzhou Heideneng Environmental Protection Equipment&Technology Co., Ltd

Product Detail

Product Tags

Explosion-proof Quartz Sand Filter + Activated Carbon Filter + Two-stage Reverse Osmosis + Dosing Water Tank Fully Automatic Purification System

This is a high-purity, intrinsically safe water treatment system tailored for explosive hazardous environments (e.g., petrochemical plants, coal mines, chemical workshops with flammable gas/vapor). It combines explosion-proof pretreatment, two-stage high-efficiency RO purification, and automatic dosing storage to produce ultra-pure water that meets strict industrial standards, while complying with global explosion-proof safety regulations.

Core System Components & Functions

Component	Core Function	Explosion-proof Design Key Points
Explosion-proof Quartz Sand Filter	First-stage pretreatment: Remove suspended solids, sediment, rust, and particles ≥20μm from raw water; reduce turbidity to ≤1 NTU and SDI value to <5, protecting downstream equipment from clogging.	1. Vessel: Carbon steel with anti-corrosion coating or 316L stainless steel (meets pressure vessel standards GB 150). 2. Electrical parts: Explosion-proof backwash pump (Ex d IIB T4), explosion-proof level switch, and intrinsically safe (Ex ia) pressure transmitter. 3. Safety: Anti-static grounding (ground resistance ≤4Ω); pressure relief valve (set at 1.2×working pressure) to prevent overpressure rupture.
Explosion-proof Activated Carbon Filter	Second-stage pretreatment: Adsorb residual chlorine (≤0.1mg/L), organic matter (TOC removal rate ≥60%), odor, and pigments; prevent RO membrane oxidation and biofouling.	1. Media: Granular activated carbon (GAC) with high iodine value (≥1000mg/g) for strong adsorption capacity. 2. Explosion-proof parts: Same as sand filter—explosion-proof motor for backwashing; flame arrester at exhaust port to block external ignition sources. 3. Operation: Fully automatic backwashing triggered by pressure difference (ΔP≥0.2MPa) or time (24h interval), no manual operation in hazardous areas.
Two-stage Reverse Osmosis (RO) Unit	Core purification: First-stage RO removes 95–98% of dissolved salts, heavy metals, and bacteria; second-stage RO further purifies permeate water, achieving desalination rate ≥99.5% and product water conductivity ≤0.5μS/cm (25℃).	1. Explosion-proof configuration: High-pressure pumps for both stages with Ex d IIB T4 explosion-proof motors; RO control cabinet with Ex e increased safety enclosure (isolates electrical sparks from flammable atmosphere). 2. Automatic control: PLC-based intelligent system (explosion-proof version) monitors pressure, flow rate, and conductivity in real time; auto-adjusts operating parameters and triggers alarms for anomalies (e.g., low flow, high conductivity). 3. Safety features: Overpressure shutdown, low-pressure protection, and explosion-proof leakage detector (alerts immediately if water leaks in hazardous areas).
Automatic Dosing System	Dosing of scale inhibitors, biocides, or pH adjusters (e.g., sulfuric acid, sodium hydroxide) to optimize RO operation and prevent membrane fouling/scaling.	1. Explosion-proof design: Explosion-proof metering pump (Ex ia IIC T6), intrinsically safe liquid level sensor, and explosion-proof dosing tank. 2. Control logic: Dosing flow rate is linked to raw water flow rate; auto-stop when liquid level is low to avoid dry running of pumps.
Dosing Water Tank	Store dosed raw water (pretreatment feed water) and finished pure water; maintain stable water supply for the system.	1. Material: Food-grade HDPE (for pure water tank) or carbon steel (for raw water dosing tank), with anti-static coating. 2. Explosion-proof accessories: Explosion-proof liquid level gauge, anti-static breathing valve (prevents static accumulation and gas backflow), and explosion-proof mixer (for uniform dosing).
Supporting Explosion-proof Auxiliaries	Ensure stable and safe operation of the entire system.	1. Explosion-proof instruments: Pressure gauge, flow meter, conductivity meter (Ex ia intrinsically safe certification). 2. Pipeline system: Anti-static pipeline with flange connection (no welding in hazardous areas); grounding clamp every 50m to release static electricity. 3. Explosion-proof UV Sterilizer (optional): Post-treat pure water to kill residual bacteria (Ex d enclosure, suitable for Zone 1 hazardous areas).

System Workflow (Hazardous Environment Applicable)

Raw Water Dosing & Pretreatment

Raw water enters the dosing water tank, where scale inhibitors/biocides are automatically added by the explosion-proof metering pump and mixed evenly by the explosion-proof mixer. The dosed water is pressurized by an explosion-proof booster pump and flows into the explosion-proof quartz sand filter to remove large suspended particles, then into the explosion-proof activated carbon filter to eliminate residual chlorine and organic matter. The effluent meets strict RO inlet requirements: SDI < 3, residual chlorine < 0.1mg/L, turbidity ≤ 0.5 NTU.
Two-stage RO High-purity Purification
- First-stage RO: Pretreated water is pressurized to 1.0–1.5MPa by an explosion-proof high-pressure pump, passing through the first RO membrane module. 55–70% of the water becomes primary pure water (conductivity ~5–10μS/cm), and the concentrated water is discharged or recycled.
- Second-stage RO: Primary pure water is pressurized to 0.8–1.2MPa by a second explosion-proof high-pressure pump, entering the second RO membrane module for deep purification. The final product water has conductivity ≤ 0.5μS/cm, meeting ultra-pure water standards for industrial applications.
Post-treatment & Storage

The two-stage RO product water can be further treated by an optional explosion-proof UV sterilizer to achieve sterile water quality, then stored in the pure water tank (equipped with an anti-static breathing valve). The system automatically controls water intake and discharge to maintain a stable liquid level in the tank.

Key Advantages & Application Scenarios

1. Core Advantages

Explosion-proof Safety Compliance: All electrical components meet ATEX, IECEx, or GB 3836 standards, suitable for Zone 1/2 hazardous areas with flammable gas/vapor; anti-static design eliminates static spark risks.
Ultra-high Purification Precision: Two-stage RO achieves desalination rate ≥ 99.5%, far higher than single-stage RO; product water quality is stable and meets high-end industrial demands.
Fully Automatic Unattended Operation: PLC system integrates functions like auto backwashing, auto dosing, auto membrane cleaning, and fault alarm; reduces labor costs and avoids manual operation in hazardous areas.
Anti-fouling & Scaling Optimization: Automatic dosing system precisely controls the addition of scale inhibitors/biocides, extending RO membrane lifespan by 20–30% (up to 3–4 years).

2. Typical Application Scenarios

Petrochemical Industry: Preparation of boiler feed water, instrument cleaning water, and process water in oil refineries and chemical plants (hazardous areas with methane, benzene, or gasoline vapor).
Coal Mining Industry: Water treatment for underground fire-fighting, equipment cooling, and coal washing (explosive gas such as methane exists in mines).
Electronic Manufacturing Industry: Production of ultra-pure water for semiconductor chip cleaning in workshops with flammable solvents.
Pharmaceutical Industry: Preparation of purified water and water for injection (WFI) in GMP workshops with flammable drug raw materials.

Operation & Maintenance Notes (Explosion-proof Focus)

Explosion-proof Equipment Maintenance
- No Disassembly in Hazardous Areas: Maintenance of explosion-proof enclosures (e.g., control cabinets, motor casings) must be carried out in non-hazardous areas after power cut and gas detection.
- Sealing Performance Check: Monthly check the sealing rings of explosion-proof junction boxes; replace damaged ones immediately to prevent flammable gas from entering the electrical cavity.
- Grounding System Inspection: Test grounding resistance quarterly to ensure it is ≤ 4Ω; clean grounding clamps and remove rust to maintain good conductivity.
Filter Media & RO Membrane Maintenance
- Backwash the quartz sand filter and activated carbon filter every 24 hours (triggered automatically by pressure difference); replace activated carbon every 6–12 months, and quartz sand every 2–3 years.
- Perform acid-alkali cleaning on two-stage RO membranes every 4–6 months (use explosion-proof cleaning pumps); replace first-stage RO membranes every 3–4 years, and second-stage membranes every 4–5 years.
- Replace the precision filter element (installed before RO) every 1–2 months to prevent particle contamination of the membrane.
Dosing System Maintenance
- Check the dosing tank liquid level daily; replenish chemicals in time to avoid dry running of metering pumps.
- Calibrate metering pumps monthly to ensure accurate dosing flow rate; clean the dosing pipeline quarterly to prevent clogging.