CN103486430A

CN103486430A - Method for removing water hammer and flow limiting of steam system

Info

Publication number: CN103486430A
Application number: CN201310427042.9A
Authority: CN
Inventors: 李强; 杨晓丽
Original assignee: Ningxia Baota Petrochemical Technology Industry Development Co Ltd
Current assignee: Ningxia Baota Petrochemical Technology Industry Development Co Ltd
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2014-01-01

Abstract

The invention discloses a method for removing water hammer and flow limiting of a steam system by utilizing a tube with large diameter to exhaust steam condensate. Selection of a condensate exhausting tube is determined according to the diameter of a steam pipeline; when the diameter of the steam pipeline is smaller than or equal to DN100, a tube with the large diameter with the same diameter as the steam pipeline is selected as the condensate exhausting tube, and the length of the condensate exhausting tube is at least equal to 100mm; if the diameter of the steam pipeline is larger than DN100 and smaller than DN200, a tube with the large diameter with the diameter ranging from DN100 to DN150 is selected as the condensate exhausting tube, and the length of the condensate exhausting tube is at least equal to 150mm; if the diameter of the steam pipeline is larger than or equal to DN200, a tube with the half diameter as the steam pipeline is selected as the condensate exhausting tube, and the length of the condensate exhausting tube is at least equal to 200mm. An appropriate trap is selected to exhaust the condensate according to the process, and the condensate can be recovered. By the aid of the method, the problems of water hammer and flow limiting caused by excessive accumulation of condensate in the steam system can be solved effectively.

Description

A kind of method of removing vapour system water attack and current limliting

Technical field

The invention belongs to vapour system water of condensation recovery technology field, be specifically related to a kind of method of removing vapour system water attack and current limliting.

Background technique

Vapour system is industrial a kind of heating system commonly used.In the steam power system pipeline, due to pipeline externally heat radiation all the time, can form water of condensation in pipeline, and constantly increase.If water of condensation condensate drain pipeline too carefully will cause water of condensation to discharge, cause water of condensation to be brought into downstream., therefore can cause water of condensation in steam line to form great waves, and then develop into water attack far away higher than the flow velocity of water of condensation due to the flow velocity of steam.When steam meets with the water of condensation lower than vapor (steam) temperature, can produce thermal shock.The shared volume ratio water of condensation of steam is much bigger, when vapour volume reduces suddenly, can emit shock wave to whole system.If suitably do not process, this water hammer can cause very serious destruction, causes huge steam line to be interrupted by water attack, and disconnected pipe again security incident can occur from high falling.

In addition, in the steam power system pipeline, there is the place of portal frame that hydrophobic pipeline and drain valve are generally arranged, but because the condensate drain pipeline is generally all used thinner pipeline, cause water of condensation not discharge in time, the place that water of condensation rises at portal frame forms piles up, and causes steam line to carry area to reduce, and the steam feed flow reduces, pressure decreased, cause very large impact to the downstream applying unit.

At present, some enterprise is used thermodynamic drain valve or mechanical drain valve, and due to the north of china in winter cold weather, when outdoor steam line condensate drain bears water, thermodynamic drain valve steam is easily revealed, and the easy bursting by freezing of mechanical drain valve.Therefore, drain valve is not just installed by some enterprise, directly with stop valve, replaces.The thermostatic drain valve plays the block steam and drain water effect for steam pipe system equipment, water of condensation can be discharged automatically, and not be afraid of and freeze, and is quick on the draw, and does not reveal steam.Its application area is wider.

Summary of the invention

The purpose of this invention is to provide a kind of water of condensation of utilizing the condensate drain eliminating steam line that diameter is thicker, remove the method for vapour system water attack and current limliting.

The present invention is achieved through the following technical solutions.

Thick condensate drain was installed below pipeline before the ascent stage below the minimum point of steam line or at portal frame.The caliber of condensate drain is determined according to the diameter of steam pipe line.

Condensate drain diameter selection principle: steam line caliber≤DN100 select extra heavy pipe that diameter is identical with the steam tube diameter as condensate drain, and condensate drain length at least equals 100mm; Steam line caliber>DN100,<DN200's, select the extra heavy pipe of DN100 ~ DN150 as condensate drain, and condensate drain length at least equal 150mm; Steam line diameter >=DN200's, select diameter be half pipeline of steam pipe line diameter as condensate drain, and condensate drain length at least equals 200mm.

The selective basis technological requirement of drain valve and steam line condensing capacity etc. are selected suitable drain valve.

The present invention can effectively improve water of condensation condensate drain effect in steam line, and the water of condensation in steam line can be discharged from steam line in time, reduces the accumulation amount of water of condensation in steam line, avoids vapour system to produce water attack and steam current limliting.

The accompanying drawing explanation

Fig. 1 steam line extra heavy pipe condensate drain bears water schematic diagram.

Fig. 2 portal frame extra heavy pipe condensate drain bears water schematic diagram.

The meaning of respectively numbering representative in figure is as follows.

1: steam pipeline; 2: the condensate drain pipeline; 3: portal frame; 4: drain valve; 5: stop valve; 1-1: steam; 1-2: water of condensation; 1-3: water of condensation is gone recovery line.

Embodiment

Below in conjunction with Figure of description, the present invention is described in detail.

A kind of extra heavy pipe condensate drain is removed the method for vapour system water attack and current limliting, at the lowest order place of steam pipeline (1), thick condensate drain (2) is installed, and drain valve (4) is installed on condensate drain, and the drain valve the other end leads to condensed water recovery line (1-3).

When the main steam pipe condensate drain bears water, usually the caliber of main steam pipe is thicker, and the steam line diameter is greater than DN200, and selecting diameter is that half pipeline of main steam header linear diameter is as condensate drain.Condensate drain length is necessary >=200mm.Because the main steam line water of condensation needs to discharge in time, should select the thermostatic drain valve.The water of condensation of discharge is delivered to the condensate return pipe line to be reclaimed.Stop valve (5) is installed in the condensate drain end, for blowdown.

While on steam branch pipe, condensate drain being installed, steam branch pipe diameter>DN100,<DN200, the condensate drain of selection DN100, more than condensate drain length 150mm.Select the thermostatic drain valve, water of condensation can be discharged in time, avoid vapour system water attack and steam current limliting.Remaining water of condensation is discharged by the stop valve (5) of condensate drain bottom.

Condensate drain is installed at steam line (1) or portal frame (3) lowest order place at caliber≤DN100, condensate drain diameter DN100, and more than condensate drain length 100mm, drain valve (4) is selected the thermostatic drain valve.The thermal coagulation water of discharging through drain valve reclaims use.The residue water of condensation is discharged through stop valve (5).

Claims

1. a method of removing vapour system water attack and current limliting, is characterized in that lowest order or the portal frame on steam line installed condensate drain before the ascent stage, and suitable drain valve is installed on condensate drain, and steam condensate is discharged by condensate drain and drain valve.

2. a kind of method of removing vapour system water attack and current limliting as claimed in claim 1, the diameter that it is characterized in that condensate drain is determined according to the steam line diameter, steam line caliber≤DN100, select extra heavy pipe that diameter is identical with the steam tube diameter as condensate drain, condensate drain length at least equals 100mm; Steam line caliber>DN100,<DN200's, select the extra heavy pipe of DN100 ~ DN150 as condensate drain, condensate drain length at least equals 150mm; Steam line diameter >=DN200's, select diameter be half pipeline of steam pipe line diameter as condensate drain, condensate drain length at least equals 200mm.