The industrial waste heat resources are rich, and the waste heat resources account for about 17% to 67% of the total fuel consumption, of which the recovery rate is 60%. Industrial waste heat recovery and utilization are also considered a “new energy”. The development of industrial waste heat recovery and utilization technology reduces the thermal energy consumption of enterprises and creates greater benefits for enterprises.
The biochemical wastewater treatment process of a paper company in Guangdong Province requires that the conditioning pool water (papermaking wastewater) must be kept at 35~38℃. In winter, the ambient temperature is low, and when the biochemical anaerobic water drops to about 20°C, it needs to be heated by an additional heat source. At present, the conventional practice is to use steam heating, which requires a large amount of steam and is not economical.
Luoyang Ruichang Environmental Engineering Co., Ltd. uses polymer material, tubular heat exchangers, to recover the waste heat of desulfurization wastewater and heat the water in the conditioning tank, which can completely solve the problem of corrosion and blockage and ensure the long-term stable operation of the system.
The project includes the entire EPC project including system design, equipment supply, civil construction, on-site installation, and commissioning.
The project duration is 60 days.
The recovered steam is ≥10t/h, and the economic benefit is about 3 million yuan/year, far exceeding the design index.
Ruichang Waste Heat Recycling Technology
In the waste heat recovery project of desulfurization wastewater, a heat exchange system is set up on the drainage pipe of the adjustment tank, and the high-temperature wastewater is returned to the biochemical workshop after the desulfurization tower is used to heat the low-temperature papermaking wastewater in the adjustment tank when the ambient temperature is low in winter to increase the temperature.
The heat exchange system is composed of a modified polymer material tubular heat exchanger, as well as a descaling device, a filter, and a temperature and pressure instrument arranged on the water pipeline.
Excellent corrosion resistance
Desulfurization wastewater is alkaline, and biochemical wastewater is acidic. Metal materials such as ordinary carbon steel and stainless steel are difficult to resist such complex strong acid and alkali corrosion, and the service life of metal heat exchangers is difficult to guarantee. Therefore, a material that can resist acid corrosion is required. Do heat exchangers. The polymer material tubular heat exchanger is completely free from acid and alkali corrosion.
Low flow resistance
The polymer material tubular heat exchanger adopts the appropriate diameter of heat exchange tubes and tube spacing, single-flow design, smooth flow channel, low flow resistance, and small pressure drop.
Easy installation and maintenance
Single machine modular design can be spliced in various combinations, flexible and convenient, high space utilization, and strong space adaptability. The single module is easy to assemble, the on-site installation and construction volume is small, and the construction period is short. When a fault occurs, the faulty module can be easily removed for independent maintenance.
High strength, compact and lightweight structure
Using polymer materials, the strength fully meets the requirements of industrial applications, and the density of non-metals is more than 80% smaller than that of metals.