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Prediction and early warning method for concentration of SO2 in flue gas in refinery heating furnace

A heating furnace, SO2 technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of large investment, no early warning function, and the unit price of online analyzer is not cheap, so as to ensure high efficiency The effect of production and cost reduction

Pending Publication Date: 2022-03-25
ZHEJIANG SUPCON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if an on-line analyzer for fuel gas sulfur content is added to each heating furnace, the investment will be huge due to the numerous installations in the refinery and dozens of heating furnaces, and the unit price of the on-line analyzer is not too cheap.
Moreover, the on-line analyzer measures the sulfur content of the current fuel gas, and it is impossible to determine in advance the impact of the sulfur content of each gas source of the refinery fuel gas on the sulfur content of the heating furnace fuel gas and the sulfur content of the heating furnace flue gas. 2 Effect of Concentration
That is to say, the online analyzer only analyzes the sulfur content of the fuel gas at the current moment, and there is no early warning function

Method used

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  • Prediction and early warning method for concentration of SO2 in flue gas in refinery heating furnace
  • Prediction and early warning method for concentration of SO2 in flue gas in refinery heating furnace
  • Prediction and early warning method for concentration of SO2 in flue gas in refinery heating furnace

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Embodiment 1

[0035] Such as Figure 1A As shown, the embodiment of the present invention provides a kind of flue gas SO in the refinery heating furnace 2 For the concentration prediction and early warning method, the execution subject of the method of this embodiment can be any electronic device carrying the computer program, and any electronic device can realize the method of this embodiment. The method of this embodiment may include the following steps:

[0036] S10. For the refinery to be analyzed, determine the flow path of fuel gas in the pipeline network according to the valve switch status in the fuel gas pipeline network, and build a flow model of fuel gas in the pipeline network. The scope of the flow model covers: nodes and nodes connecting pipes.

[0037] The nodes in this embodiment may include: the point where the gas supply end, the fuel gas source, the gas consumption end and more than three pipelines intersect; the gas consumption end here refers to each heating furnace in...

Embodiment 2

[0064] combine Figure 1A , 1B and figure 2 Shown, the embodiment of the present invention provides a kind of graph refinery heating furnace flue gas SO 2 For the concentration prediction method, in the following examples, the gas source / supply end is taken as the upstream, and the gas consumption end such as the heating furnace is taken as the downstream. The valves in the refinery include manual valves and smart valves. The method of this embodiment is specifically described as follows.

[0065] 201. Collect the flow rate of all gas sources, the pressure of all gas sources, the composition analysis data of each gas source, the online analysis data of sulfur content of each gas source, and the fuel gas flow and pressure of each downstream heating furnace.

[0066] In particular, it is necessary to collect real-time data from all gas sources in the refinery. In practical application, for the designated refinery to be analyzed, it can be read from the real-time database of ...

Embodiment 3

[0133] The method of the above-mentioned embodiment 1 and embodiment 2 is described below with an example.

[0134] The main sources of fuel gas in a refinery are: dry gas after desorption, dry gas after desorption, PSA desorption gas, dry gas after desorption from gas cabinets, and natural gas. The source of fuel gas is referred to as gas source, and the flow and pressure data of each gas source are shown in Table 1 below. These data are real-time data measured by the flow meters and pressure gauges of each gas source. These data are uploaded to the real-time database and can be collected from the real-time database. The upstream of this embodiment is the gas supply end, that is, these gas sources.

[0135] Table 1 Flow and pressure of each gas source

[0136]

[0137] The composition analysis of each gas source comes from the manual analysis data (LIMS analysis data, as shown in Table 2 below), but the sulfur content data comes from the sulfur content online analysis in...

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Abstract

The invention relates to a method for predicting and early warning the concentration of SO2 in flue gas in a refinery heating furnace, which comprises the following steps: determining the flow path of fuel gas in a pipe network according to the on-off state of a valve in the pipe network, and constructing a fuel gas pipe network flow model in combination with a material balance equation, a heat conservation equation and a pressure drop equation. The flow, pressure and composition of each node are calculated through a model, the sulfur content of fuel gas of each heating furnace in a refinery plant is obtained, the SO2 concentration of flue gas of the heating furnace is calculated, and an alarm is given by comparing the SO2 concentration with the SO2 concentration limit value (50mg / m < 3 >) of the flue gas of the heating furnace; the sulfur content limit value of the fuel gas is inversely calculated according to the SO2 concentration limit value, the sulfur content limit value of each gas source is inversely calculated by combining the flow of each node calculated by a fuel gas pipe network flow model, and the sulfur content limit value is compared with sulfur content data measured on line by the gas source to implement early warning. The method provided by the invention can effectively predict the SO2 concentration of the flue gas at low cost and give an alarm, and can also implement early warning from the source to remind an operator to process and prevent SO2 from exceeding the standard.

Description

technical field [0001] The invention relates to the technical field of refinery harmful gas forecasting, in particular to a kind of flue gas SO in the refinery heating furnace. 2 Concentration prediction and early warning methods. Background technique [0002] The fuel gas currently used by the heating furnaces of refining and chemical enterprises is self-produced dry gas, but the dry gas generally contains high sulfur content, and it needs to be desulfurized by the desulfurization device before it can go to the downstream heating furnaces (ie gas traps). However, due to the operation fluctuation of the desulfurization device, the desulfurization may not be complete, and the dry gas after desulfurization still contains high sulfur content. If it still goes to the downstream heating furnace at this time, it may cause SO 2 The concentration exceeds the standard. But it is also possible that the standard will not be exceeded, because the dry gas with high sulfur content is mi...

Claims

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Application Information

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IPC IPC(8): G06F30/18G06F30/28G06F111/02G06F113/08G06F113/14G06F119/14
CPCG06F30/18G06F30/28G06F2111/02G06F2113/08G06F2113/14G06F2119/14
Inventor 涂阳勤吴玉成杨义磊李达王宽心吴哲峰郭廉洁
Owner ZHEJIANG SUPCON TECH