Technologies

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Ebara Engineering Review No.254

New Centrifugal Chiller Equipped with Inverter Standardly Model RTXF

EBARA has developed and released a new centrifugal chiller model RTXF, featuring lower energy consumption, a compact size, and a shorter delivery period. Positioned as the successor to EBARA’s core model RTBF, the product structure is totally redesigned in order to achieve these features. It is characterized by a gearless-type compressor equipped with an inverter as a standard component. In an evaluation test, the new centrifugal chiller model RTXF proved itself to be equal or superior to the current model RTBF in performance.

Keywords

Centrifugal chiller, High-speed motor, Inverter drive, Gearless direct drive, Low-pressure refrigerant, Low-noise design, Small footprint

Centrifugal Chiller Model RTSF for Low-temperature Brine

An antifreeze called brine of which the temperature is approximately -20 °C, is used by facilities such as chemical plants to cool process loads. While EBARA has manufactured and sold centrifugal chillers for cooling this brine, needs for a new model have risen in response to demand for higher efficiency. Under these circumstances, EBARA developed and commercialized a centrifugal chiller model RTSF, for low-temperature brine based on the technology of the centrifugal chiller model RTBF, which has been on the market since 2009 and has gaind a great deal of trust from users. EBARA began selling model RTSF in April 2016.

Keywords

Centrifugal chiller, Low-temperature brine, Refrigerant, High pressure gas safety act, High reliability

Large-Size Industrial Cooling Tower with a Water Conservation Function

EBARA constructed a large-size industrial cooling tower for Inner Mongolia Yitai Petrochemical Co., Ltd. This cooling tower, which contains an air-cooled heat exchanger, has achieved a water conservation function and a white-plume preventive function. The volume of circulating water in cooling towers widely used for large-size industrial water circulation equipment is huge, and so is the evaporation amount. This cooling tower is equipped with a water conservation function, which enables it to contribute greatly to water conservation in regions lack of water resources. It also incorporates a white-plume preventive function because white plumes from cooling towers are associated with pollution. This paper introduces the large-size industrial cooling tower and explains the water conservation function and the principles of operation of the white-plume preventive function.

Keywords

Industrial cooling tower, White-plume preventive, Water conservation type, Cooling tower, Evaporation amount

Pretreatment with a Foam Fractionator for the Seawater Reverse Osmosis (SWRO) Desalination Process

For the seawater desalination facilities based on reverse osmosis (RO), the pretreatment technologies, such as sand filtration and UF filtration, is essential to maintain the performance of RO membranes. To ensure the stable performance of the solid-liquid separators as pretreatment processes, prior to them, a foam fractionator is proposed to firstly remove turbid components, transparent exopolymer particles (TEP), and biopolymers, and its performance was reported in this paper. In lab-scale experiments, we have verified the performance of the foam fractionator and studied the effect of TEP on the treatment performance of RO membranes. We also conducted pilot-scale experiments to verify the effectiveness of the foam fractionator during long-term continuous operations carried out both in Tokyo, Japan, and in Jakarta, Indonesia.

Keywords

Foam Fractionator, Pretreatment, Transparent Exopolymer Particles (TEP), Biopolymers, Seawater desalination, Fouling, Reverse osmosis, Sand filter, Ultrafiltration, Turbidity

Lecture on Fundamental Aspects of High Temperature Corrosion and Corrosion Protection
Part 4: High Temperature Corrosion and Corrosion Protection in Incineration Plants

For incineration plants that use chlorine-containing fuel, chlorine-induced corrosion is an unavoidable issue. The most important key for high temperature corrosion protection is to make the formation of protective corrosion product layers stable; however, in the case of chlorination-induced corrosion, formed chloride is low in density, and serves poorly as a protective layer. Furthermore, chlorides generally have characteristics, such as low melting points and high vapor pressure levels, which cause various types of corrosion with different characteristics. This part discusses high temperature corrosion caused by chlorination in various sections other than boilers, including volatilization of chlorides at ultrahigh temperatures, grain boundary corrosion of cast metal, and wear-related corrosion, as well as protective measures against such corrosion. Additionally, corrosion due to dew condensation, which is an unavoidable corrosion problem in actual incinerators, is briefly described.

Keywords

High temperature corrosion, Chlorination, Volatilization, Grain boundary corrosion,
High temperature erosion-corrosion, Condensation, Void formation, Stoker, In-bed tube, Casting alloy

Delivery of Municipal Waste Treatment Plant for Musashino City
- a Waste Incineration Plant with a Diverse Variety of Functions -

EBARA constructed and completed a municipal waste treatment plant for Musashino City at the end of March 2017. The plant combines the basic functions of a waste incineration plant with a diverse variety of other functions, including, under a concept designated by the city, heat and electric power supply to nearby facilities both under normal circumstances and in the event of a disaster. In addition to all of these functions, its architectural design is harmonious with the surrounding scenery and it offers further hospitable services for visitors. Because the plant had to be constructed on a small site adjacent to existing facilities, another feature it offers is its compact size, which was achieved by adopting processes that are simple but able to meet very strict exhaust control values, by installing the incinerator, platform, and other facilities underground. The dry exhaust treatment process using sodium bicarbonate has achieved operation with 8 ppm or less of hydrogen chloride, which was the range previously covered by wet exhaust treatment processes.

Keywords

Waste incineration, Disaster prevention, Seismic design, Cogeneration system, Energy supply,
Low air ratio combustion, Sodium bicarbonate, High efficiency power generation

Delivery of High-Efficiency Waste-to-Energy Plant and Waste Heat Utilization Facility for Funabashi City
- Contribution to Establish the Recycling-Oriented Society in the Local Community -

At the end of March 2017, EBARA reconstructed the Funabashi Hokubu Incineration Plant in Funabashi City, Chiba Prefecture, and also completed the construction of (1) a high-efficiency waste-to-energy facility (Funabashi Meguru Plant) that consists of incineration equipment with a capacity of 381 t/d and bulky waste crushing equipment with a capacity of 15 tons per 5 hours, and (2) a waste heat utilization facility (Funabashi Meguru Spa). The high-efficiency waste-to-energy facility is characterized by a reduced environmental burden, and it can achieve low CO and low NOx by adopting EBARA’s latest stoker-type incineration system, HPCC21, and an exhaust gas recirculation system and by running stable, constant high-temperature combustion at a low air ratio. The facility is expected to contribute to waste treatment services, which will facilitate the establishment of a recycling-based society and which is rooted in the local community, through waste-to-energy conversion as well as the utilization of green energy, such as the supply of hot water to the waste heat utilization facility by utilizing waste heat from the waste-to-energy facility.

Keywords

Municipal solid waste, Incineration plant, Low air ratio combustion, Carbon monoxide, Nitrogen oxides,
Environmental enlightenment, Waste heat utilization facility, High-efficiency waste-to-energy plant

Report on Delivery and Operation Condition of Grate-Type (Stoker-Type) Waste-to-Energy Plants with High Energy-Efficiency Flue Gas Treatment System Corresponding to the EU Emission Standards in China (Songjiang and Fengxian, Shanghai)

EBARA delivered two grate-type incineration facilities to Songjiang (500 t/d × 4 lines) and Fengxian (500 t/d × 2 lines) Waste-to-Energy Plants in Shanghai City, China. Performance tests were completed in November 2016. These are the ninth and tenth plants that the EBARA group has delivered incineration facilities in mainland China. Both plants were constructed in Shanghai, the largest city of China, and the EU emission standard, which is the highest level of flue gas regulation in China, is applied. To comply with the standard, wet type flue gas treatment system was adopted; in addition, a gas-gas heat exchanger (GGH) was also employed for energy efficiency improvement. This paper reports on the state-of-the-art flue gas treatment technology with a combination of the dry process (calcium hydroxide injection) and the wet process (wet scrubbers), cost performance improvement by employing GGH, the operational status of the facilities to date, and the results of the performance tests.

Keywords

Municipal solid waste, Grate-type incinerator, Environment, Flue gas treatment, Wet scrubber, GGH, China, Shanghai, Songjiang, Fengxian

Practical Use of a Remote Support Center for Waste Incineration Facilities

In June 2016, our remote support center for waste incineration facilities was established in Fujisawa City, Kanagawa Prefecture, and started real-time remote support services. The remote support center is intended to remotely monitor the on-site operation data, operational status and local situations through industrial television (ITV) images of each facility so that each facility can be operated stably. We are aiming to optimize plant operation and maintenance plan by data analysis. This paper presents an overview of the remote support center, and its structure, functions, operational performance for the past year or so, and outlook for the future.

Keywords

Waste incineration facility, Remote, Support, ITV, DBO, LCC, VPN, IoT, Optimization