成果報告書詳細
管理番号20120000000375
タイトル*平成23年度中間年報 省エネルギー革新技術開発事業/先導研究/蒸気生成吸収ヒートポンプシステムの研究開発
公開日2012/6/1
報告書年度2011 - 2011
委託先名学校法人早稲田大学 荏原冷熱システム株式会社
プロジェクト番号P09015
部署名省エネルギー部
和文要約「和文要約等以下本編抜粋」
(1)事業概要
本研究開発の目標は、再利用が難しく廃棄されることが多いとされている100℃未満の排温水や250℃未満の排ガスを熱源にして、150℃以上の蒸気を生成する吸収ヒートポンプを実現することである。
吸収ヒートポンプの蒸気生成温度を上げていくと、ヒートポンプ缶胴内圧が大気圧を超えるようになる。吸収ヒートポンプの作動媒体の特性上、大気開放はできるだけ避ける必要があるが、大気圧を超えると法規制の対象となり定期点検時には開放点検が必要になるなどの問題が生じる。そこで、大気圧未満の運転を可能とし,開放点検の対象とせずに高温(150℃蒸気)を得るという第1の目標を立て、さらに、法規制への対応を考慮しつつ汎用蒸気として180℃を得るという第2の目標を立てた。それぞれの目標に対して、小型のモデル機、実用サイズ機を製作・試験・検証することで研究を進めている。
英文要約Title: Research and Development Program for Innovative Energy Efficiency Technology / Advanced Research / Research and Development of Steam Generation Heat Pump System (FY2010-FY2012) FY2011 Annual Report

1. Outline of this Project
The low temperature heat sources such as hot water less than 100 deg C, exhaust gas less than 250 deg C, are usually difficult to be utilized because the temperature is too low. In this project, an absorption heat pump will be developed to generate 150 deg C steam by utilizing these low temperature heat sources with the chamber pressure below the atmospheric pressure. Moreover, an absorption heat pump will be also developed to generate 180 deg C steam with the chamber pressure exceeds the atmospheric pressure.

2. Study of the absorption cycle with simulation and experiment
A 150 deg C steam generation test apparatus was manufactured for demonstration tests. From the results of the tests, the absorption cycle of the 150 deg C and the generation of steam were confirmed. We also conducted a simulation for this absorption cycle. It was clarified that the simulation results almost agreed with the test results.
A 180 deg C steam generation test apparatus was also manufactured based on the basic design specification examined by the absorption cycle simulation. From the results of the 180 deg C test apparatus, the generation of 180 deg C steam was confirmed and COP reached 0.28 on the rated operation condition.
In addition, a test apparatus of the absorber was prototyped to investigate the characteristics of water evaporation in the tubes.

3. Development of 150 deg C practical size prototype
A 150 deg C practical size prototype was designed and manufactured according to the results of the 150 deg C test apparatus. The prototype was operated on the rated condition and 150 deg C steam was generated.

4. Development of 180 deg C practical size prototype
A 180 deg C prototype was proportional designed with the composition similar to the 180 deg C test apparatus. In the present, the detailed design and the production drawing were finished. An evaporator and a generator driven by exhaust gas heat source were also studied.

5. Safety measure
The method to check the inside of vessels of the absorption heat pump was examined. A fiberscope was inserted from a small hole of the vessels to check inside of the 150 deg C prototype under nitrogen atmosphere.

6. Investigation of user specification
We interviewed some companies of petrochemical industry, rubber tire industry and food manufacture. In these companies except the food manufacture, a lot of hot water above 90 deg C was discharged. It had a great expectation for generating steam (150-180 deg C) from the hot water.

7. Examination of auxiliary components and test of materials
The auxiliary components, such as the spray apparatuses and the high temperature circulation pumps were examined for practical use in the absorption heat pump. Various types of the spray apparatuses, such as drop type, siphon type and spray nozzle type were investigated.
In this heat pump, a high temperature circulation pump is necessary. The magnet pump is one type of the high temperature circulation pumps. The structure of the magnet pump is simple and the cost is inexpensive. The endurance test of the magnet pump in the water with iron component was carried out.
In addition, the immersion test of the materials which will be used for the 180 deg C steam generation system such as SS400, SUS430, SUS304, Cu and Cu-Ni were conducted in LiBr solution of 190 deg C for 30 days. The corrosion rates were calculated from the decrease of weight.
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