Enviromental systems

Thermal Combustion Equipment – TNV

The advanced technical solution of the ENETEX thermal combustion equipment guarantees the fulfilment of the most demanding emission limits with efficiency exceeding 99.9%. The universality of use is no doubt an important feature. Organic pollutants usually oxidise to H2O and CO2 at temperatures between 700 and 800°C. The oxidising temperature may then reach the value of 1.200°C to dispose of thermally more demanding pollutants.

The features of ENETEX thermal combustion systems:

• high cleansing efficiency (> 99.9 %),
• high operating usability,
• efficient use of waste heat,
• above-standard service life,
• automated operation,
• simple operation and maintenance,
• compact building form,
• special version for exhaust gases with, the “0” or “1” explosion hazard zone.

Parameters:

• compact design with an integrated heat exchanger,
• version with a combustion chamber and additional exchangers,
• combustion chamber with a ceramic, fire-resistant filling,
• possibility to use different sources of additio-nal energy,
• may be combined with dust filters, desulp-hurisation, deNOx etc.,
• non-stop operation.

Recuperative Thermal and Catalytic Combustion Equipment – RTNV, RKNV

These ENETEX combustion systems recuperate heat contained in the outgoing exhaust gas. The heat efficiency of up to 95% provides low consumption of auxiliary fuels and high volume of exhausted air. The ceramic bed accumulating heat at high temperatures in the combustion chamber provides long service life. The combination of the catalyser with preheating of the incoming exhaust gas creates a very compact device that works in auto-thermal operation starting with low concentration of organic substances and it is suitable in cases when it is not possible to use a gaseous auxiliary fuel provided that the risk factors for exhaust gas have been eliminated. Since 2003, we have been using a new ceramic filling with a low pressure resistance which brings significant savings in the consumption of electric power

The features of ENETEX combustion systems with heat recuperation:

• low consumption of additional energy ,
• high regulation range of the unit (1:6),
• stable and perfect combustion in the entire regulation range,
• automatic control system and operation without service,
• long service life and undemanding maintenance.

Parameters:

• thermal or catalytic version,
• use of waste heat with efficiency of up to 95%,
• auto-thermal operation from 1.5 g/Nm³ of hydrocarbon,
• input concentration of harmful substances of up to 5 g/Nm³,
• short-term peaks of up to 8 g/Nm³.

Rotary Concentrator

The rotary concentrator is used for production technology that combines a high amount of waste air with a low VOC concentration. The rotary concentrator provides VOC concentration in the ratio of 1:10 (1:15) for the subsequent elimination in a catalytic or thermal way. The most common use is in the field of varnishing lines, plastic production, paper industry etc. The rotary concentrator is based on a zeolite filling fitted in a wheel shape that continuously rotates and is divided into several parts (sectors): processing (300 – 310°), cooling (20 – 30°) and desorption (25 – 30°). Organic substances are captured on the surface by intermolecular forces; no chemical bonds are used. Unlike activated carbon, synthetic zeolites are fire-safe, namely with occurrence of ketones as dissolving agents.

The process of the rotary concentrator activity may be summarised in two phases:

1. Adsorption phase:

The exhaust gas from the production technology (with ambient temperature of about 25°C) goes through a solid body filter and then through the processing part of the rotary concentrator. Organic substances contained in the exhaust gas are adsorbed on the zeolite surface below the value of 50 mg/Nm³ TOC. The purified gas (output temperature increases by 5°C at the most) leaves through the connected air system directly into the atmosphere.

2. Desorption phase:

The desorption air consists of a branched part of the process exhaust gas (about 1/10) with the use of a desorption ventilator. It is first led through the cooling sector of the rotary wheel, then heated up to the temperature of 120 – 180°C in the pre-heating exchanger and it forces out harmful organic substances from the zeolite filling during the passage through the desorption sector of the rotary wheel. The increase in the concentration as against the original exhaust gas is about 10 times. The outgoing desorption air flow (about 80 – 110°C) is subsequently cleansed in a thermal or catalytic way.

Advantages of the rotary concentrator:

• simple and safe use,
• low operating and service costs,
• wide spectrum of sizes suitable for any size of operation (the basic series covers the volumes of air from 12.000 Nm³/h to 100.000 Nm³/h,
• long service life of the adsorption material,
• automatic operation.

Adsorption

Adsorption may be a good alternative to oxidising methods as a method of disposal of pollutants in relation to specific relations.

ENETEX offers the following with regard to the character of contamination:

• sorption on a solid bed,
• desorption in a compact version with sorption,
• continual sorption and desorption with a rotary concentrator,
• external desorption on owned or leased equipment.

ENETEX will recommend the most suitable procedure according to the operating and investment costs.

The characteristic features of ENETEX adsorption systems:

• 4 the minimal efficiency is 75% for odour substances and 90% for regular dissolving agents,
• 4 low acquisition costs and a wide range of use,
• 4 selection of the adsorption system type tailored to the environment and operating conditions,
• 4 chemical adsorption – adsorption based on chemically treated activated carbon for capturing odour substances,
• 4 for service-free and continuous operation.

The adsorption equipment works on two principles:

1. The principle of reversible capture of gaseous organic substances (regular dissolving agents) on the active surface. When the used filling drops below the minimal efficiency, it is regenerated or replaced with a new filling.

2. The principle of irreversible capture of gaseous organic substances on the active surface with an additional chemical reaction (chemical adsorption). When the used filling drops below the minimal efficiency, it is replaced with a new filling. The disposal of used fillings is provided by a specialized company. Regeneration is not possible.

Waste Glass Recycling Line

Glass waste (hereinafter the recyclate) is first cut and homogenised in a spare tank (not included in the unit) and then continually transferred by the H121 worm conveyor to the C20 rotary furnace. The recyclate is heated up to the required temperature in the rotary furnace. During the heating, organic compounds contained in the recyclate transform into gases that are conducted away from the rotary furnace to the C30 combustion chamber. The purified recyclate is continually carried out of the rotary furnace by the H101 cooled worm conveyor and handed over for further processing.

The circulation air containing gaseous organic substances and free from dust particles is brought to the C30 combustion chamber to be heated. The heating is executed with the use of the combustion products of the BD30 burner, which is a part of the C30 chamber, and with the use of the heat created during the oxidising reaction (combustion) of gaseous organic substances contained in the circulation air, which provides their liquidation. The process of oxidisation of organic substances is regulated by the activity of the BD30 burner and by the amount of combustion air brought in the C30 chamber. In order to prevent oxidising (combustion) of organic substances in the rotary furnace, the concentration of O₂ in the circulation air at the output of the heating chamber is maintained at a low value.

The unit consists of the following basic parts:

• rotary furnace (C20),
• worm conveyors for input of material and output of recyclate (H121, H122, H123, H101),
• combustion and heating chamber (C 30),
• heat exchangers (W10,W30),
• filter (F10),
• ventilators (V10, V20, V30),
• piping,
• security, controlling and regulation elements,
• pressure air distribution system,
• wiring,
• steel construction.