Energy Saving Dimple Plate Heat Exchanger For Falling Film Black Liquor Concentration

Energy saving pillow jacket design exchanger for falling film black liquor concentration

Paper Pulp Black water Introduction

Weak Black Liquor (WBL) from the brown stock washers is typically at 13-18%TS. Most of this water content must be evaporated to produce a material with high enough solids to support effective combustion in the recovery boiler, typically between 65% and 80%TS.

During evaporation to this level of solids, various volatile components (sulfur compounds, methanol, etc.) are released from the liquor and must be separated from the condensate to allow reuse in the fiberline and recausticizing. From this point of view, the evaporation plant actually serves as a"water factory"within the mill. Black liquor also contains a substantial fraction of inorganic compounds which, during the evaporation process, reach their solubility limit and can deposit as scale on the evaporator heat transfer surfaces greatly limiting the operating capacity of the evaporation plant and of the entire recovery island.

“Black Liquor” is a by-product of pulp from mills that make products from trees, such as paper. It is currently used to recover cooking chemicals and produce high-pressure steam used in the pulp and paper-making process. It is composed of different ingredients from these processes such as lignin, hemicellulose, sodium hydroxide (NaOH) and sodium sulfide (Na2S). The lignin compound in black liquor can be used to make biofuel but it can be expensive to produce and so fuel made from it is not very common.

However, and according to the International Energy Agency (IEA), the future of using black liquor as fuel is promising and it is seen as the fifth most important fuel on earth!

How to reach 80-85% dry solids?

Due to the high viscosity

MP-steam as heating medium

liquor temperature 175 ℃ in final concentrator

Liquor retention time

evaporator acts also as a LHT-reactor

Duplex construction material

high alkali content may cause Stress Corrosion Cracking (SCC)

Mechanical Vapor Recompression MVR Evaporator consumption compared with traditional evaporation equipment calculated by evaporating 1T water

The heat transfer plate consists of two thin plates, which are completely welded around by laser welding process, and the middle area is full of pillow pattern; after forming process, pillow shaped cavity is formed inside the heat transfer plate. Pillow design creates excellent turbulence and provides self-supporting structure. In practical application, additional welding path is often added in the heat transfer plate to adjust and control the interface position of fluid in and out of the heat transfer plate, the flow velocity and flow rate of fluid in the plate, so as to optimize the heat transfer effect.

Advantages of heat transfer plate technology:

1) Excellent turbulence design, high heat transfer coefficient;

2) high welding reliability;

3) small resistance on the external surface, not easy to produce dirt;

4) high temperature and high pressure resistance;

5) wide channel, low pressure drop, easy to clean;

6) flexible shape design, optimization of heat transfer effect.

Production Capability

Jiangsu Hanpu Mechanical Technology Co., Ltd. is a project engineering company jointly established by Jiangsu Zhongyi Environmental Technology Co., Ltd., FERREO A/S in Denmark, Shanghai Jiaotong University and Nanjing Kingreat Machinery Co., Ltd. The company's production base is located in the Huangqiao Industrial Zone of Taixing, covering an area of 300 acres. The companies involved are in the industry of new material, new energy, medicine, chemical, environmental protection, food, and beverage, etc.

The company has a national functional office and facilities as a scientific research bureau. The research center now has 5 doctor tutors, 8 professional engineers, 11 senior engineers, 42 engineers and 68 assistant engineers making it a leading specialized research bureau.

The company has various kinds of general (special) machinery devices including 480 sets and are the most developed working devices in the world such as: Toshiba CNC boring and milling machine imported from Japan, German Schiess CNC turning processing center, CNC fine plasma cutting machine imported from Germany, Laser cutting machine, CNC folding machine, CNC wire cutting and CNC shearing machine, etc.

The company's main projects include but are not limited to: MVR evaporation system, powder washing salt and vacuum salt production project, oil tank sludge cleaning project, landfill leachate treatment project, plant/animal oil processing production line, urban wastewater treatment project, various wastewater treatment projects, and CBD oil extraction production line. Technical support and transfer of API product technology package. The main products are centrifuge series, multi-effect and MVR evaporation and crystallization equipment, laser welding heat transfer board, lithium battery material mixing equipment, pressure vessel and titanium, zirconium, nickel, and other non-standard special equipment.

The company's sales network throughout the whole world, with a domestic sales market share of 50%, and exported to the United States, Canada, Germany, Spain, France, Switzerland, Sweden, Denmark, Australia, Brazil, Argentina, Chile, Colombia, Russia, Ukraine, Poland, Uzbekistan, Indonesia, Vietnam, Singapore, Malaysia, India, Japan, South Korea, Iran, South Africa, Nigeria, and Rwanda.

The company is an internationally competitive engineering company that integrates technical consulting, design, procurement, construction, installation and driving into one, providing engineering EPC general contract, project management, engineering supervision and other comprehensive, full-process services. The company is Committed to be the first and world-renowned technology and technology engineering company in Asia, providing cutting-edge technology and one-stop solutions for the world's industries.