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A method of adjusting the temperature difference of the water vapor system of the gasifier by using desalinated water

A technology for desalination and gasification, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Unfavorable production recovery and other problems, to achieve the effect of speeding up the start-up process, obvious cooling effect, and shortening the water supply time

Active Publication Date: 2014-10-29
GUIZHOU TIANFU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if methods such as drafting and blasting are used to cool down, the effect is not satisfactory, which is not conducive to the promotion of the maintenance plan and the recovery of production
In short, the gasifier water-gas system in the prior art takes a long time to fill water and cool down, which affects the progress of maintenance and start-up

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method of using desalinated water to adjust the temperature difference of the water-steam system of the gasifier. First, the desalinated water is sent to the deaerator, then through thermal deaeration and chemical deaeration, and the pH value is adjusted, and then sent from the deaerator to the boiler through the feed water pump , the pH value of the desalted water is 8, no oxygen is removed, and the temperature is 30°C.

[0014] During maintenance, when the temperature of the water vapor system naturally drops to about 90°C, drain the original boiler water and replace it with desalted water at 20-30°C for direct heat exchange and forced cooling. Since the specific heat of desalinated water is the largest, the cooling effect is obvious . It only takes about 36 hours from parking to entering the gasifier for inspection, which is half the time compared to the original one, which is equivalent to driving 1.5 days earlier. At the same time, it is convenient for the maint...

Embodiment 2

[0016] A method of using desalinated water to adjust the temperature difference of the water-steam system of the gasifier. First, the desalinated water is sent to the deaerator, then through thermal deaeration and chemical deaeration, and the pH value is adjusted, and then sent from the deaerator to the boiler through the feed water pump , the pH value of the desalted water is 8, no oxygen is removed, and the temperature is 30°C. in:

[0017] (1) Adjust the pH value of the desalinated water: After the desalted water enters the water vapor system of the gasifier, trisodium phosphate is added to the steam drum while heating up, and the desalinated water is forced to circulate, so that the pH value of the desalted water can be adjusted to 8.5.

[0018] (2) Remove dissolved oxygen in desalinated water: before heating up the water vapor system of the gasifier, empty the pressure valve on the system pipeline. Raise to 95°C, and then close the pressure valve to deoxygenate thermally...

Embodiment 3

[0020] A method of using desalinated water to adjust the temperature difference of the water-steam system of the gasifier. First, the desalinated water is sent to the deaerator, then through thermal deaeration and chemical deaeration, and the pH value is adjusted, and then sent from the deaerator to the boiler through the feed water pump , the pH value of the desalted water is 8, no oxygen is removed, and the temperature is 30°C. in:

[0021] (1) Adjust the pH value of the desalinated water: After the desalted water enters the water vapor system of the gasifier, trisodium phosphate is added to the steam drum while heating up, and the desalinated water is forced to circulate, so that the pH value of the desalted water can be adjusted to 9.2.

[0022] (2) Remove dissolved oxygen in desalinated water: before heating up the water vapor system of the gasifier, empty the pressure valve on the system pipeline. Raise to 105°C, and then close the pressure valve to deoxygenate thermall...

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Abstract

The invention discloses a method for regulating the temperature difference of a water steam system of a gasification furnace through desalted water. The method comprises the following steps of: conveying boiler supply water to a deaerator; performing thermal deaeration and chemical deaeration, and adjusting a pH value; and conveying the water from the deaerator to a boiler through a water pump. The method is characterized in that the boiler supply water is the desalted water; the pH value of the desalted water is 7 to 8; the desalted water is not deoxidized; the temperature is 20 to 30 DEG C. In the process of adjusting the pH value of the desalted water, after the desalted water enters the water steam system of the gasification furnace, drugs are added into a steam pocket while the temperature rises, and the desalted water is forcedly circulated, so that the pH value of the desalted water can be adjusted to be 8.5 to 9.2. According to the method, parts of the gasification furnace can be prevented from being damaged by thermal stress, and good temperature-rise and temperature-drop effects are achieved.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a method for adjusting the temperature difference of a water vapor system of a gasifier by using desalinated water. Background technique [0002] The water gas system of the gasifier is the core of the Shell coal gasification device. The gasifier is mainly composed of a heating surface (membrane water wall), an annular space and a pressure-bearing shell. The shell material is SA387Gr11CL2, the maximum wall thickness is 80mm, and the maximum inner diameter is 4640 mm. The membrane water cooling wall is installed in the shell, and the gasification process actually takes place in the cavity surrounded by the membrane water cooling wall, and the gasification pressure is borne by the pressure-bearing shell. Between the membrane water cooling wall and the pressure-bearing shell is an annular space, which is mainly used to place the input and output pipelines, header pipe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/00C02F9/10F22D5/00
Inventor 王波陈静李华余万仁
Owner GUIZHOU TIANFU CHEM
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