JPWO2021098940A5

JPWO2021098940A5 -

Info

Publication number: JPWO2021098940A5
Application number: JP2022528698A
Authority: JP
Publication date: 2023-08-16
Anticipated expiration: 2039-11-18

Description

プラントの所望最高運転温度に達するように、熱伝達流体の運転温度を段階的に上昇させる起動運転は、平衡相で最高運転圧力を超えることを防止する。 A start-up operation in which the operating temperature of the heat transfer fluid is stepped to reach the desired maximum operating temperature of the plant prevents exceeding the maximum operating pressure in the equilibrium phase.

Claims

Use of a methylpolysiloxane mixture as a heat transfer fluid in a solar thermal power plant (CSP) having an operating temperature of 300-500° C., comprising:
The methylpolysiloxane mixture is
(a) a linear methylpolysiloxane MD _X M, where x is an integer from 0 to 100, with a molar M:D ratio in the mixture of from 1:15.5 to 1:30; or
(b) linear methylpolysiloxane MD _X M (where x is an integer of 0 to 80) and cyclic dimethylpolysiloxane D _y (where y is an integer of 3 or more); , the total content of all cyclic dimethylpolysiloxanes D _y is in the range of 10-95 wt%, and the molar M:D ratio in the mixture is 1:10.5-1:30;
Use of methylpolysiloxane mixtures.

The methylpolysiloxane mixture is
(a) the mixture has a molar M:D ratio of 1:15.5 to 1:25, or
(b) a linear methylpolysiloxane MD _X M (wherein x is an integer of 0 to 29) and a cyclic dimethylpolysiloxane D _y (wherein y is an integer of 3 to 10); wherein the total content of all cyclic dimethylpolysiloxanes D _y is in the range of 60-80 wt%, and the molar M:D ratio in the mixture is 1:11-1:20;
Use of the methylpolysiloxane mixture according to claim 1.

The methylpolysiloxane mixture (a) has a total content of all cyclic dimethylpolysiloxanes D _y in the range of 0 to 1 wt%, the number average Mn of the mixture is in the range of 400 to 3000 g / mol, and the weight (b) linear methylpolysiloxane MD _X M (where x is an integer from 0 to 29) and cyclic dimethylpolysiloxane D _y (formula in which y is an integer of 3 to 10), the total content of all cyclic dimethylpolysiloxanes D _y is within the range of 60 to 80 wt%, and the molar M:D ratio in the mixture is 1: 11 to 1:20, the mixture has a number average Mn ranging from 100 to 2000 g/mol and a weight average Mw ranging from 100 to 6000 g/mol.
Use of the methylpolysiloxane mixture according to claim 1 or 2.

Use of a methylpolysiloxane mixture according to any one of the preceding claims, wherein the methylpolysiloxane mixture contains up to 150 ppm T groups and up to 100 ppm Q groups.

5. Use of a methylpolysiloxane mixture according to claim 4, wherein the methylpolysiloxane mixture contains up to 100 ppm of T groups and no Q groups.

Including linear methylpolysiloxane MD _X M (where x is an integer of 0 to 80) and cyclic dimethylpolysiloxane D _y (where y is an integer of 3 or more), and all A methylpolysiloxane mixture having a total content of cyclic dimethylpolysiloxanes D _y in the range of 10 to 95 wt % and a molar M:D ratio in the mixture of 1:10.5 to 1:30.

The linear methylpolysiloxane MD _X M (wherein x is an integer of 0 to 29) and cyclic dimethylpolysiloxane D _y (wherein y is an integer of 3 to 10), The total content of all the cyclic dimethylpolysiloxane _Dy is in the range of 60 to 80 wt%, the molar M:D ratio is 1:11 to 1:20, and the number average Mn is 100 to 2000 g/mol. and having a weight average Mw in the range from 100 to 6000 g/mol.

8. The methylpolysiloxane mixture of claim 7, wherein the number average Mn ranges from 200 to 1600 g/mol and the weight average Mw ranges from 200 to 2200 g/mol.

9. The methylpolysiloxane mixture of claim 8, wherein the number average Mn ranges from 250 to 1400 g/mol and the weight average Mw ranges from 250 to 2000 g/mol.

A methylpolysiloxane mixture according to any one of claims 6 to 9, comprising up to 150 ppm of T groups and up to 100 ppm of Q groups.

11. The methylpolysiloxane mixture of claim 10, containing up to 100 ppm of T groups and no Q groups.

A method of operating a CSP plant, comprising:
using the methylpolysiloxane mixture according to any one of claims 6 to 11 as a heat transfer fluid, and increasing the temperature stepwise during start-up of the plant until the operating temperature is reached;
A method of operating a CSP plant, comprising:

The step of stepwise increasing the temperature includes:
a) setting a starting temperature that is 100-200°C below the maximum operating temperature, but at least 100°C;
b) holding the starting temperature for at least 3 hours until a constant operating pressure is maintained;
c) increasing the operating temperature between 5 and 150°C,
d) holding the temperature for at least 3 hours until a constant operating pressure is maintained;
e) repeating steps c) and d) until the maximum operating temperature is reached;
13. The method of operating a CSP plant according to claim 12, comprising: