A supercritical unit boiler cleaning interface treatment device and its cleaning process

A technology for cleaning supercritical units and boilers, which is applied in the field of pickling and can solve the problems of increased tube wall temperature, hidden safety hazards, and long time consumption.

Inactive Publication Date: 2016-08-17
徐春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After cutting and adding elbows, the restoration of the pipeline is more complicated, requiring welding, heat treatment and other processes, which not only takes more time, but also increases the cost
[0003] Secondly, the current pickling descaling rate is basically maintained at about 95%, and it is difficult to make a breakthrough; moreover, the current cleaning process is easy to deposit residual products in the pickling process, and this deposit is easy to The shedding accumulates in the elbow or pipe hole, resulting in poor circulation of the medium inside the pipe. To a certain extent, the temperature of the pipe wall will rise sharply, causing short-term overheating and bursting of the pipe: in addition, the existence of the scale layer is also extremely unfavorable to the heat transfer of the pipe, which will cause The temperature of the pipe wall will increase significantly, resulting in long-term overheating and bursting of the pipe, and there are certain safety hazards

Method used

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  • A supercritical unit boiler cleaning interface treatment device and its cleaning process
  • A supercritical unit boiler cleaning interface treatment device and its cleaning process
  • A supercritical unit boiler cleaning interface treatment device and its cleaning process

Examples

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Effect test

Embodiment 1

[0038] The cleaning process of the present invention is as follows: first, the ammonia washing medium mainly composed of 2% ammonia water, 0.5% ammonium persulfate, 0.3% corrosion inhibitor and the rest of water is used for 4 hours at a temperature of 30°C. Then flush with desalinated water, and after flushing, use a compound organic acid mainly composed of 6% glycolic acid compounded formic acid with a mass ratio of 1:0.2, 0.2% corrosion inhibitor monoethanolamine, and 0.5% thiourea and hydrogen fluoride The pickling medium composed of ammonium additives and the balance of water at a mass ratio of 1.5:1 is used for the first pickling at a temperature of 50°C. The pickling time is controlled at 10 hours and the pH is 4.5. After pickling, rinse with desalinated water again, and then use 5% catalytic citric acid, 0.3% corrosion inhibitor, 0.5% thiourea and ammonium bifluoride in a mass ratio of 1.8:1 to form an auxiliary agent and residual A pickling medium composed of a certain...

Embodiment 2

[0040] The cleaning process of the present invention is as follows: firstly, the ammonia washing medium mainly composed of 2.5% ammonia water, 0.7% ammonium persulfate, 0.35% corrosion inhibitor and the rest of water is used for ammonia washing at 40° C. for 3 hours. Then flush with desalinated water, and after flushing, use mainly 5% of catalytic citric acid, 0.3% of corrosion inhibitor monoethanolamine, 0.8% of auxiliary agents composed of thiourea and ammonium bifluoride in a mass ratio of 1.6:1 and the balance The pickling medium composed of water was first pickled at a temperature of 75°C, the pickling time was controlled at 8 hours, and the pH was 5. After pickling, rinse with desalinated water again, and then use 4% ethylenediaminetetraacetic acid, 0.3% corrosion inhibitor, 0.8% thiourea and ammonium bifluoride in a mass ratio of 1.8:1. The acid pickling medium composed of agent and the rest of water is subjected to the second pickling at a temperature of 80°C, the pick...

Embodiment 3

[0042] The cleaning process of the present invention is as follows: first, the ammonia washing medium mainly composed of 3% ammonia water, 0.8% ammonium persulfate, 0.4% corrosion inhibitor and the rest of water is used for 2 hours at a temperature of 50°C. Then flush with desalinated water, and after flushing, use 5% ethylenediaminetetraacetic acid, 0.4% corrosion inhibitor monoethanolamine, 1% additives composed of thiourea and ammonium bifluoride in a mass ratio of 2:1 and The pickling medium composed of the remaining water was first pickled at a temperature of 90°C, the pickling time was controlled at 6 hours, and the pH was 5.5. After pickling, rinse with desalinated water again, and then use 4% compound organic acid composed of glycolic acid compound fluoride with a mass ratio of 1:0.5, 0.4% corrosion inhibitor, 1% thiourea The pickling medium composed of ammonium bifluoride and ammonium bifluoride in a mass ratio of 1.8:1 to form an auxiliary agent and the rest of water...

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Abstract

The invention provides a processing unit for a boiler cleaning connector of a supercritical unit and a cleaning process thereof, belongs to the field of an acid pickling technology, and solves the problems that an existing boiler is bad in acid pickling effect and high in cost. The processing unit for the boiler cleaning connector of the supercritical unit comprises an economizer, a boiler, a steam separator, a water storage tank, a drain flash tank, a drain tank and a wastewater pool, wherein a check valve and a boiler water circulating pump are sequentially connected between the economizer and the water storage tank, the check valve comprises a check valve body with an inlet and an outlet, the check valve body is provided with a first valve cover in which a through hole communicated with an outlet of the check valve body and one end of the through hole extends outwards and protrudes out the check valve body to form a connecting pipe, and the connecting pipe is connected with a washing water pump through a temporary pipeline. The washing process comprises ammonia washing, washing, acid pickling, washing, rinsing and passivating. The processing unit provided by the invention has the advantages of good acid pickling effect and low cost.

Description

technical field [0001] The invention belongs to the technical field of pickling, and in particular relates to a supercritical unit boiler cleaning interface treatment device and a cleaning process thereof. Background technique [0002] With the development of my country's power industry, supercritical and ultra-supercritical units have become the trend of future development, and steam parameters continue to increase. Therefore, in order to ensure the heat exchange efficiency of the boiler heating surface, it is necessary to monitor the scaling of the heating surface and regularly Carry out pickling and descaling of the heating surface. Therefore, there is a problem of connecting the pickling temporary system with the original boiler system. In order to meet the flow rate of the pickling liquid, increase the flow rate of the entire pickling system and improve the effect, the site generally chooses the boiler main water supply pipe and overflow pipe with a relatively large dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B37/54B08B3/02
Inventor 徐春朱志贵赵学峰
Owner 徐春
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