Wuxi oubai instrument technology co. LTD
Focus on flow meter development
Iso9001-2000 international quality system certification
18661273788
 Hello, welcome to visit wuxi oubai instrument official website! We serve you wholeheartedly! 
Sitemap               Message          Contact
Online customer service
 Work Time
Mon to Fri :8:30-17:30
Sat to Sun :9:00-17:00
 Contact Details
hotline:18661273788
email:abc@qq.com
在線客服
 Work Time
Mon to Fri :8:30-17:30
Sat to Sun :9:00-17:00
 Contact Details
客服熱線:18661273788
郵箱:abc@qq.com

飽和蒸汽計量系統

Issuing time:2018-11-16 09:24

蒸汽流量計量與蒸汽的密度有關,而蒸汽的密度隨著蒸汽的溫度、壓力變化而變化。因此,在蒸汽流量計量中必須合理的進行溫度、壓力補償,對密度進行修正,才能提高蒸汽流量計量的正確性,減小計量誤差。蒸汽分為飽和蒸汽和過熱蒸汽,由于蒸汽性質不同,在相同的壓力下蒸汽密度是不同的。

因此,在蒸汽流量的計量中所采用的計量方法也不同。應根據被測蒸汽的性質,合理選擇計量儀器、儀表和補償方法。

目前使用流量儀表測量蒸汽流量,測量介質都是指單相的過熱蒸汽或飽和蒸汽。對于相流經常變化的蒸汽,肯定會存在測量不準確的問題。這個問題的解決方法是保持蒸汽的過熱度,盡量減少蒸汽的含水量,例如加強蒸汽管道的保溫措施,減少蒸汽的壓力損失等,以提高蒸汽測量的準確度。然而這些方法并不能徹底解決蒸汽流量測量不準確的問題,解決這一問題的根本辦法是開發一種可測兩相流動介質的流量儀表。

當蒸汽的工作狀態偏離設計狀態,流量示值將產生誤差。對流量測量也產生影響,所以蒸汽流量的測量需要采取補償措施,并且因蒸汽的狀態變化補償因素也比較復雜。過熱蒸汽的密度由蒸汽的溫度、壓力兩個參數決定,而且在參數的不同范圍內,密度的表達形式也不相同,無法用同一通式表示,所以不能獲得統一的密度計算公式,只能個別推導求得溫度、壓力補償公式。在溫度、壓力波動范圍較大的場合,除進行溫度、壓力補償外,還需要考慮對氣體膨脹系數的補償。

無論采用何種流量計檢測飽和蒸汽的流量,在蒸汽壓力波動的條件下工作,必須采取壓力補償措施,這是因為在流量方程中,都含有蒸汽密度的因素,工作條件與設計條件不一致時,讀數會產生誤差,誤差的大小和工作壓力與設計壓力偏差的大小有關,P實>P設將出現負誤差,否則將出現正誤差。蒸汽的干度條件是關系到能否準確計量蒸汽流量的重要條件,目前正在研制在線蒸汽干度檢測儀表,待干度儀表應用于蒸汽流量計量與補償系統,必將進一步提高計量的準確性。目前應采取以下三項措施:(1)輸送蒸汽的管路必須有良好的保溫措施防止熱量損失。(2)在蒸汽管路上要逐段疏水,在管道的最低處及儀表前的管道上應設置疏水器,及時排出冷凝水。(3)鍋爐操作中應避免出現汽包液位過高現象,盡量減少負荷出現大的波動。

1101898.jpg


Share to:
推薦閱讀
文章附圖

孔板流量計包含了三個部分:一是孔板;二是導壓管路;三是差壓變送器。其中,孔板屬于節流元件,主要作用是把介質轉換為差...

文章附圖

污水流量計可廣泛用于市政給供水、鋼鐵、石油、化工、電力、工業、水利、水政水資源等部門的液體的體積流量的測量,特別適...

文章附圖

近幾年隨著對流量計的研究和開發,流量儀表選型呈現從單一儀表向多元化儀表方向發展,隨著天然氣在一次能源中的比例逐年增...

文章附圖

隨著天然氣產業的大發展,天然氣流量計工作也獲得了越來越多的重視,我國已經在天然氣流量儀表的設計選型、使用、安裝、維...

Customer Cases

Customer Cases

Customer Cases

Perkins
Product name:
electromagnetic flowmeter Date of purchase: May 2015 Purchase quantity: 8 sets
Product name:
vortex street flowmeter
Date of purchase: July 2016
Purchase quantity: 5 sets
Wuxi Shenli
Buy product name:
differential pressure transmitter
Date of purchase: March 2017
Purchase quantity: 7 sets
Walter machinery
Purchase product name:
digital display table
Date of purchase: April 2018
Purchase quantity: 11 sets
Wanyuan environment
Wuxi oubai instrument technology co., ltd. has a number of excellent r & d team, and with jiangnan university, wuxi business school and other universities and enterprises cooperation. The company has a sound sales and after-sales service system and efficient marketing team; The product sales coverage keeps growing all the year round.
In the industry, it is one of the production and sales enterprises of flow meters with a complete range of products and a large scale, which produces good electromagnetic flowmeters, liquid flowmeters, gas flowmeters, etc.
The company focuses on user practice and product research and development, and has obtained a number of patents and research and development results, and has mature experience in the research and development, design, manufacturing and installation of flow meter equipment in various industries.
7 * 24-hour service system, one year guaranteed, so that you at any time product problems we can solve as soon as possible for you, to ensure the interests of customers;
Set up a group of professional teams, engaged in design, production, sales and installation services;
To the well-known large projects have done supporting, set up many classic cases;
index | electromagnetic flowmeter | vortex street flowmeter | open channel flowmeter | product center | case analysis | about our | news center | contact us
Address: 11-2-4, jinshan fourth branch road, beitang district, wuxi city, jiangsu province Hot line: 0510-89052999 0510-82358878 The true: 0510-89052999 Hand machine: 18661273788
Q Q: 630441747
Mail box: sales@wxobai.com
Mail editor: 214000
Technical support: le shi tong