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成果報告書詳細
管理番号20180000000121
タイトル*平成28年度中間年報 再生可能エネルギー熱利用技術開発 その他再生可能エネルギー熱利用システム導入拡大に資する革新的技術開発 食品廃棄物の超臨界水ガス化による再生可能熱の創生
公開日2018/6/26
報告書年度2016 - 2016
委託先名国立大学法人広島大学 株式会社東洋高圧 中国電力株式会社
プロジェクト番号P14017
部署名新エネルギー部
和文要約
英文要約Achievements in FY2016

1. Feasibility study on supercritical water gasification of shochu residue and food wastes
We studied the feasibility of supercritical water gasification (SCWG) of shochu residue and food wastes. There are 343 factories of shochu in Japan. We estimated that 16 factories can pay back the construction cost within 10 years. Also we confirmed the feasibility of SCWG of food wastes.

2. Fundamental characteristics of suppression of tar from shochu residue
  Tar suppression was expressed quantitatively for model compounds. Eqs. (1)-(3) shows the amount of tarry material as function of radical scavenger concentration. Eq. (1) is for acetic acid addition to guaiacol. Eq. (2) is for formic acid addition to guaiacol and glucose mixture. Eq. (3) is for acetic acid addition to guaiacol and glucose mixture. In these equations, wtar, Cfa, and Caa denote amount of tarry material [mg/min], formic acid concentration [%], and acetic acid concentration [%], respectively.
wtar = 0.0139 Caa2 - 0.0491 Caa + 0.0447 (1)
wtar = 0.017 Cfa + 0.051 (2)
wtar =0.054 Caa + 0.0738 (3)

3 Determination of the supercritical water gasification characteristics of shochu residue
3-1. Laboratory scale plant
For mixture of glucose and guaiacol, addition of formic acid or acetic acid resulted in tarry material increase. To circumvent this, rapid heating is to be applied.
For shochu residue, gasification rate was confirmed for the case of radical scavenger addition before and after preheater. Addition of radical scavenger after the preheater suppressed tarry material better, but it did not affect gasification rate. Thus, equation developed for the case of adding radical scavenger before preheater can be used for the case of adding radical scavenger after preheater.

3-2. Pilot scale plant
The SCWG tests with different gasification conditions in the case of adding a radical scavenger were conducted continuing from last year. About four times increase of heating rate was achieved by shortening the heat exchanger. The daily start and stop (DSS) 60 h gasification test was conducted by Nijo-barley shochu residue with radical scavenger successfully. The heat exchanger tube pressure loss of this DSS 60 h gasification test showed about 400 kPa at the end of the test, but tar plugging sign was not observed. The estimated operation time below 1 MPa of tube pressure loss was 70 h 17 min.

4. Design of the commercial plant
We are revising the performance standard of 20 t/d from reviewing the feasibility study. We think there is no major change in PID at this time. The plan of the demonstration device manufacturing and trial operation has been postponed to FY 2017 or later, design change as feedback, addition and deletion of equipment, etc. were carried out.

5. Detail design and plan for manufacturing and installation of the demonstration plant
Initially, we planned to produce 6 t / d equipment. We have planned possible plans within the range of a small budget because the upper limit of the budget for equipment manufacturing has been greatly reduced relative to the planned amount at the time of application.
As planning, 1 Change the throughput of the equipment, 2 Advance the design of the device by reducing some functions, 3 Part of current facilities will be diverted, Etc., under the consent of NEDO.
As a result, the plan to reconstruct the pilot plant owned by the Chugoku Electric Power as a substitute demonstration device is the most feasible, and the plan is changed, and the examination of remodeling is under way, now.
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