业务新闻

GEA supports South African customer Mpact with a black liquor concentration and drying plant

25 Jul 2023

Mpact, South Africa's leading company in the production and recycling of paper and plastic packaging, is taking delivery of a new black liquor concentration and drying plant from GEA, a machinery and equipment manufacturer and solution provider. Black liquor is an energy- and lignin-rich by-product of cellulose production using the sulfite process in the paper industry. It is produced when the lignin is separated from the pulp, which then forms the paper fibers. The technology solution for a modernization project at the Mpact paper mill based in Mkhondo, Mpumalanga – a province of South Africa consists of a GEA decanter centrifuge, a GEA Mechanical Vapor Recompression (MVR) evaporator and a GEA spray dryer.

Photo: GEA supplies South African customer Mpact with a black liquor concentration plant. (Photo: Mpact)

GEA supplies South African customer Mpact with a black liquor concentration plant. (Photo: Mpact)

Doubling pulp capacity with GEA technology

The modernization project with the new GEA plant will enable Mpact to increase its pulp capacity from approximately 55,000 tons to 110,000 tons per year. In addition, the GEA Spray Dryer in the pulping process will enable the recovery of up to 35,000 tons of the by-product sodium lignosulfonate (SLS) powder. The SLS powder is primarily destined for export and is used, among other things, as a concrete additive.

Experience and reference projects clearly spoke in favor of GEA

Mpact selected GEA as technology supplier in a very competitive selection process due to the many successfully running reference plants, the good reputation in the industry and the high level of technical support. It was not only the GEA technology that convinced the customer. Other measures to reduce the CO2 footprint also led to the customer's positive decision. For example, GEA works with local producers and suppliers on site. By manufacturing locally, the CO2 footprint otherwise associated with transportation is reduced.

Background information

Mechanical Vapor Recompression (MVR)
The operating costs for an evaporation plant are largely determined by energy consumption. Mechanical vapor recompression (MVR) and thermal vapor recompression (TVR) are technologies that GEA uses based on many years of experience. GEA provides customers with the optimal system tailored to their individual needs.

While steam jet compressors compress only a part of the vapor leaving the evaporator, mechanical vapor re-compressors (MVR) can re-circulate the entire vapor. The vapor is compressed – usually using electric motive power – to the pressure of the corresponding heating vapor temperature of the evaporator. The energy of the vapor condensate is often still used to preheat the incoming product.

Depending on the operating conditions of the plant, a small amount of additional steam or condensation of a small amount of excess vapor may be required to maintain the overall heat balance of the evaporator and ensure stable operating conditions, especially during start-up.

Single-stage centrifugal fans (supplied as high-pressure fans) are used in evaporation plants because of their simplicity and low-maintenance design. These machines operate at high flow rates and therefore handle large throughput volumes at compression ratios of 1:1.2 to 1:2, with typical speeds ranging from about 3,000 to 12,000 rpm. Multiple blowers can be used for higher pressure rise.

Decanter centrifuges for black liquor clarification
GEA supports its customers in the realization of pulp and paper plants with a comprehensive technology spectrum. Especially for the mechanical separation of sedimentation, centrifuges are an important component in the entire process flow. GEA's expertise includes the efficient separation of impurities or solids by centrifuges for solids and liquids.

> The use of a GEA decanter centrifuge can help maximize the yield of black liquor plant by efficiently separating the solids from the liquid, and the decanter centrifuge improves the subsequent process steps.

GEA decanter centrifuges are designed to operate with high efficiency and can contribute to energy savings in the production process. This aligns with sustainability goals and demonstrates environmental responsibility.

Recovery of marketable byproducts with Zero Liquid Discharge (ZLD) systems.
ZLD systems are designed to remove dissolved solids from wastewater and return distilled water to the process. GEA's ZLD technologies enable industrial processes to meet environmental regulations and are specifically designed to separate valuable salts from waste streams before disposal to generate added value.

To achieve complete ZLD, various technologies are typically combined. These include, for example, ultrafiltration, reverse osmosis, evaporation, crystallization, desalination, separation and drying. GEA can offer a complete portfolio of technologies to recover valuable by-products that can be commercialized.

For example, GEA has custom designed and supplied numerous ZLD treatment systems for coal-fired power plants and waste incinerators. These systems effect precipitation of heavy metals, evaporation with seeding (as an anti-scaling measure) and crystallization. In addition, GEA has many years of experience in dealing with corrosive materials, so each plant can be designed and built with corrosion-resistant materials as required.

Contact

Dr. Michael Golek

Phone: 49 211 9136 1505

About GEA

GEA 是食品加工行业及众多工业领域的领先供应商之一,2019 年的销售总额约达 49 亿欧元。

作为国际技术集团,我们专注于机械制造,生产运营,工艺技术及其设备组件。 GEA 为各种终端用户市场的复杂生产流程提供可持续的能源解决方案,并提供全面的服务组合。集团在长期持续增长的食品和饮料行业的收入约占其总收入的 70%。截至 2018 年 12 月 31 日,集团的全球员工已超过 18,500 人。GEA 在其业务领域中是市场和技术领导者。GEA 是德国 MDAX 上市公司(G1A,WKN 660 200),拥有 STOXX® Europe 600 指数和优选的 MSCI 全球可持续发展指数。
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