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Natural gas purification plant product natural gas quality control interlocking system and control method

A technology of interlocking system and purification system, which is applied in the interlocking system and control field of product natural gas quality control in natural gas purification plants, and can solve the problems of non-standardized and unified control methods

Active Publication Date: 2021-07-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The product natural gas has five quality indicators: high calorific value, total sulfur content, hydrogen sulfide content, carbon dioxide content, and water dew point. At present, there is no standardized and unified method for the control of these five index values ​​in natural gas purification plants

Method used

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  • Natural gas purification plant product natural gas quality control interlocking system and control method
  • Natural gas purification plant product natural gas quality control interlocking system and control method

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Embodiment 1

[0045] This embodiment provides a natural gas purification plant product natural gas quality control interlocking system, including a controller, a product natural gas output shut-off valve 13, a vent shut-off valve 11, an execution command output end of the controller and a product natural gas output shut-off valve 13 and a vent valve Shutoff valve 11 is connected; also includes:

[0046] Water dew point on-line analyzer 6 and water dew point comparator, described water dew point on-line analyzer 6 is used to be arranged on the downstream pipeline of dehydration device of natural gas purification system; According to the signal transmission direction, water dew point on-line analyzer 6, water dew point comparator and The controllers are connected sequentially;

[0047] A carbon dioxide online analyzer 7 and a carbon dioxide comparator, the carbon dioxide online analyzer 7 is used to be arranged on the downstream pipeline of the desulfurization device of the natural gas purifi...

Embodiment 2

[0091] This embodiment provides a method for controlling the quality of natural gas produced by a natural gas purification plant, and the specific steps are as follows:

[0092] In the product natural gas, the instantaneous calorific value is less than 34.0MJ / m 3 When the interlock is triggered; the interlock action closes the product natural gas output shut-off valve and opens the vent shut-off valve;

[0093] In the product natural gas, when the instantaneous value of carbon dioxide content > 3mol%, the interlock is triggered; the interlock action closes the product natural gas output shut-off valve, and opens the vent shut-off valve;

[0094] In product natural gas, when the instantaneous value of water dew point > set value, the interlock is triggered; the interlock action closes the product natural gas output shut-off valve and opens the vent shut-off valve; usually according to the temperature of the previous year provided by the Meteorological Bureau where the natural g...

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Abstract

The invention discloses a natural gas purification plant product natural gas quality control interlocking system and control method. The natural gas purification plant product natural gas quality control interlocking system comprises a controller, a product natural gas output stop valve and an emptying stop valve. The system further includes a water dew point online analyzer which is used for detecting a water dew point value of the natural gas and transmitting the water dew point value to the water dew point comparator; a carbon dioxide online analyzer which is used for detecting carbon dioxide of natural gas and transmitting the carbon dioxide to the carbon dioxide comparator; a calorific value online analyzer which is used for detecting the calorific value of the natural gas and transmitting to the calorific value comparator; a hydrogen sulfide online analyzer which is used for detecting hydrogen sulfide in natural gas and transmitting the hydrogen sulfide to the hydrogen sulfide comparator; a total sulfur online analyzer which is used for detecting total sulfur in natural gas and sending the total sulfur to the total sulfur comparator; and a comparator which compares the instantaneous value with a set value, wherein the controller controls the product natural gas output stop valve and the emptying stop valve in an interlocking mode. The system and method are used for controlling the product natural gas quality index of a natural gas purification plant, prevent unqualified natural gas from being output, and are beneficial to ensuring the operation safety of the device.

Description

technical field [0001] The invention relates to the technical field of natural gas purification, in particular to an interlocking system and control method for quality control of natural gas produced in a natural gas purification plant. Background technique [0002] As an indispensable part of the production of sour natural gas, the natural gas purification plant is a plant that desulfurizes (carbonizes) natural gas, dehydrates it, and treats sour gas. The main process flow is: the raw natural gas from the gathering and transportation station is removed through the filter separation device to remove chemicals, hydrocarbons, free water, solid impurities and other substances entrained in the raw natural gas, and then the hydrogen sulfide, hydrogen sulfide, and Harmful substances such as organic sulfur and some carbon dioxide are then removed by the dehydration device to remove the free water in the natural gas to output qualified product natural gas, and the removed sulfur-con...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCG05B19/41875G05B2219/32368Y02P90/02
Inventor 高进郑民黄朝齐卢明君傅适张伟
Owner PETROCHINA CO LTD
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