Sustainable Management of Technologies in Marine and Off-Shore Sectors , 6-8 April 2017 , Bangkok

Introduction of Low energy consumption Slurry Freezing equipment.

ONAKA KENJI Email: [email protected] What is Slurry Ice?

Slurry ice is a fluid type of ice that consists of fine ice like snow (sphere-shaped ice with a 0.1-mm diameter) and liquid. Slurry Ice Generator & Alcohol Slurry Ice

Typical slurry ice generator.

Motor

(Slurry ice) (Alcohol Slurry) Sea water - 1 ~ - 4℃ or Alcohol

Ice has 60 times or more cold energy of liquid. Slurry ice is a mixture of liquid and ice that has this high High quality freezing with cold energy; thus, it has a more significant cooling capacity 25% energy saving. than normal liquid. Advantage of Alcohol Slurry Ice Freezing

Quick Freezing 40

30 Slurry freezing

20 Semi Air Blast Freezing method change 10

0

℃ ） 8 hours (-2℃) （ -10 11hours（-2℃） -20 Temp. 16 hours (-5℃) -30

-40 17 hours（-5℃）

-50

-60 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time（hr) Advantage of Alcohol Slurry Ice Freezing

Freezing object sunk into liquid (Not Float)

Ordinal freezing brine is heavier than but Alcohol brine is lighter than fish. Slurry freezing system flow

※ Comparison of freezing system

(Single process)

(Air Blast freezer) Air blast freezer only Fish ：+28 - 55 Room：- 60 ℃⇒ ℃ Catch Process ℃ Fish (Initial freeze) (Finarize) Hold Slurry freezing Air blast freezer Fish： + 28 Fish： - 10 ↓ ↓ - 10℃ - 55℃ Slurry freezer Slurry: - 30 Room: - 60 ℃ ℃ ℃ ℃ Slurry freezing system diagram

Freezing by spare capacity

EPR

Comp Comp Comp Comp Slurry ice generator

M 60kW M 60kW M 60kW M 60kW

Blast freezer M Ante room Slurry room

M Agitator

Freezing tank

Reserve tank Fish hold

Electronic exp. valve Automatic control and high efficiency operation. Freezing quality of Slurry and Semi air blast

Sampling position Slurry ice freeze Semi air blast

A A B

B

Middle part of body

Cell break is lighten up on surface part by Slurry ice freeze. Unfreeze drip spill also less than semi air blast. Maintain good color after unfreeze

24 hours later after unfreeze (storage 5 )

℃

Slurry ice freezing Semi air blast

Red color retain better than Semi air blast freezing. Alcohol infiltration analysis

34％vol. ethanol to be 15% slurry ice brine. Non toxic substance, (Temp. -30 ）。 Same as drinking alcohol.

℃ ①Sensory test ②Immersion volume test 25 person (21 man, 4 【Sampling position】

woman, Nissin staff) No2 (2’ is Left) Each tasted without notice. No4 part was sampled Result: 5mm inner Nobody acknowledged part alcohol smell. from No1 skin. No3

【Result】 （単位：ppm） For preservation, Soy source and Miso and Fresh 表面より 表面より 表面より 試料No. noodle are added with approximately 10,000-ppm 5ｍｍ 10ｍｍ 15ｍｍ alcohol; however, it can rarely be sensed with taste. 1 229 131 114 2 258 16 8 The infiltration volume in alcohol freezing was 2000 2’ 387 257 129 ppm or lower at every section; hence, there were no 3 34 77 1851 issues. 4 774 720 823 Energy saving 【Comparison of electric consumption】 50

45

40

35 Semi air blast 1.6Ton kW) （598kWh） 30

25 （ consumtion Electric

20 Slurry freeze 1.6Ton （451kWh）

15 Change to semi air blast when fish center temperature -10℃ 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (hr)

Method Semi air blast Slurry freezing Freeze time 24 25 hr Ele. Cons. 598 451 kWh