Gradient utilization device for heat energy in methanol rectifying process and utilization method of gradient utilization device

A technology of methanol rectification and thermal energy, which is applied in chemical instruments and methods, fractionation, preparation of organic compounds, etc., can solve problems such as high temperature of soft water tank, equipment corrosion, large heat loss, etc., and achieve reduced steam consumption and low operating costs , the effect of reducing corrosion

Active Publication Date: 2014-06-18
HENAN XINLIANXIN FERTILIZER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above situation has two disadvantages: one is that the heat is not fully recovered and utilized, and the heat loss is relatively large;
At the same time, there are three problems in this system: first, the feed temperature of the pre-column crude alcohol is low; second, the temperature of liquid methanol at the bottom of the pre-column reboiler is generally between 70 and 75°C, and is heated by steam; Third, the quality of evaporative cooling water in the system is poor, causing equipment corrosion

Method used

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  • Gradient utilization device for heat energy in methanol rectifying process and utilization method of gradient utilization device

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for utilizing a thermal energy cascade utilization device in a methanol rectification process, comprising the following steps:

[0030] 1. The low-pressure steam and the medium-pressure steam respectively enter the steam buffer tank 3 through the low-pressure steam pipeline 16 and the medium-pressure steam pipeline 17 for mixing to form mixed steam;

[0031] Two, the mixed steam described in step 1 enters the shell side of the upper part of the pre-column reboiler 1 and the shell side of the pressurized column reboiler 2 respectively for heat exchange, and after the heat exchange, in the tube side of the pre-column reboiler 1 The temperature of the methanol is 70°C, and the temperature of the methanol in the tube side of the pressurized column reboiler 2 is 125°C. After heat exchange, the mixed steam becomes condensate, and the temperature of the condensate at the shell side outlet of the upper part of the pre-column reboiler 1 is 72°C. ℃, the condensate temper...

Embodiment 2

[0039] A method for utilizing a thermal energy cascade utilization device in a methanol rectification process, comprising the following steps:

[0040] 1. The low-pressure steam and the medium-pressure steam respectively enter the steam buffer tank 3 through the low-pressure steam pipeline 16 and the medium-pressure steam pipeline 17 for mixing to form mixed steam;

[0041] Two, the mixed steam described in step 1 enters the shell side of the upper part of the pre-column reboiler 1 and the shell side of the pressurized column reboiler 2 respectively for heat exchange, and after the heat exchange, in the tube side of the pre-column reboiler 1 The temperature of methanol in the pressure column reboiler 2 is 127.5°C. After heat exchange, the mixed steam becomes condensate. ℃, the condensate temperature of the shell-side outlet of the pressurized column reboiler 2 is 125 ℃;

[0042] Three, the condensate of the shell-side outlet of the pre-tower reboiler 1 upper section described...

Embodiment 3

[0049] A method for utilizing a thermal energy cascade utilization device in a methanol rectification process, comprising the following steps:

[0050] 1. The low-pressure steam and the medium-pressure steam respectively enter the steam buffer tank 3 through the low-pressure steam pipeline 16 and the medium-pressure steam pipeline 17 for mixing to form mixed steam;

[0051] Two, the mixed steam described in step 1 enters the shell side of the upper part of the pre-column reboiler 1 and the shell side of the pressurized column reboiler 2 respectively for heat exchange, and after the heat exchange, in the tube side of the pre-column reboiler 1 The temperature of methanol is 75°C, and the temperature of methanol in the tube side of the pressurized column reboiler 2 is 130°C. After heat exchange, the mixed steam becomes condensate. ℃, the condensate temperature of the shell-side outlet of the pressurized column reboiler 2 is 125 ℃;

[0052] Three, the condensate of the shell-side...

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Abstract

The invention belongs to a gradient utilization device for heat energy in a methanol rectifying process and a utilization method of the gradient utilization device. The gradient utilization device comprises a pressurizing rectifying tower and a system crude alcohol feeding pump pipeline which are connected with a middle part inlet of a pre-rectifying tower through a first-grade crude alcohol pre-heater pipe pass and a second-grade crude alcohol pre-heater pipe pass in sequence; the lower section of the pre-rectifying tower is connected with a tower bottom of the pre-rectifying tower by a pre-tower re-boiler pipe pass; a low-pressure steam pipeline and a middle-pressure steam pipeline are respectively connected with a steam buffering tank; an outlet of the steam buffering tank is communicated with a shell pass inlet in the upper section of a pre-tower re-boiler and the shell pass inlet of a pressurizing re-boiler respectively; a shell pass outlet of the pressurizing re-boiler is connected with a pipe pass inlet of a pre-tower post-methanol pre-heater by a pipeline; the shell pass outlet of the upper section of the pre-tower re-boiler is connected with a pipeline between the shell pass outlet of the pressurizing re-boiler and the pipe pass inlet of the pre-tower post-methanol pre-heater; the pipe pass outlet of the pre-tower post-methanol pre-heater is connected with a condensed liquid groove by a shell pass on the lower section of the pre-tower re-boiler. The gradient utilization device has the advantages of less investment and low operation cost.

Description

technical field [0001] The invention belongs to the technical field of heat energy utilization in the methanol rectification process, and in particular relates to a thermal energy cascade utilization device and a utilization method in the methanol rectification process. Background technique [0002] In the three-tower rectification process, it is necessary to use medium and low pressure steam to heat the crude alcohol at the bottom of the pre-tower and pressurized tower to make it boil and turn into gas, and then return to the tower for rectification. The main energy consumption in the three-tower rectification process is the consumption of steam After the steam is heated through the liquid at the bottom of the tower, it becomes a steam condensate. The temperature of the steam condensate is 112°C after being mixed. After passing through the pre-tower, the methanol preheater heats the pressurized tower and feeds methanol, and the temperature drops to 95°C and enters the conden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/32C07C31/04C07C29/80
Inventor 李玉顺顾朝晖袁红玲刘伟刘锐杰王攀马银亮崔增涛
Owner HENAN XINLIANXIN FERTILIZER
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