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Mass flow rate and density measuring method for technological matter

A mass flow and logistics technology, applied in the direction of mass flow measurement device, measurement flow/mass flow, indirect mass flowmeter, etc., can solve the problem of not solving the problem of measuring mass flow, and achieve the effect of reducing permanent pressure drop

Inactive Publication Date: 2002-07-10
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The prior art has not yet solved the problem of using simple conventional flow measuring elements and simple conventional calculation relays to measure mass flow

Method used

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  • Mass flow rate and density measuring method for technological matter
  • Mass flow rate and density measuring method for technological matter
  • Mass flow rate and density measuring method for technological matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] If the process feed is natural gas or naphtha, the possible feed flow rates for natural gas or naphtha are

[0040] natural gas naphtha

[0041] Volume flow, Nm 3 / h 31430 8698

[0042] Mass flow rate, kg / h 22735 21857

[0043] From these figures it can be seen that the volumetric flow controller maintains 31430Nm 3 / h of natural gas, can not maintain 8698Nm 3 / h of naphtha, while the mass flow controller maintains 22735kg / h of natural gas, which also maintains the flow of naphtha.

Embodiment 2

[0045] A feed to the reformer consists of 21468kg / h of heavy naphtha and 389.3kg / h of hydrogen with molecular weights of 109.36 and 2.03 respectively, or 4400Nm 3 / h naphtha and 4298Nm 3 / h of hydrogen.

[0046] If the hydrogen flow is increased by 30%, the molecular weight of the process stream changes from 56.32 to 49.32.

[0047] A flow controller accepting a signal from a differential pressure flow element will vary the flow to 9295Nm 3 / h, which is equivalent to a signal equal to the original signal, i.e. keeping ρv 2 .

[0048] In this process, the mass flow rate of naphtha was reduced by 7%. The flow controller receiving the signal from the mass flow measurement will maintain a total mass flow of 21857.3 kg / h which is now comparable to naphtha at 21357 kg / h, ie only a 0.5% reduction.

Embodiment 3

[0050] One embodiment of the application of the present invention is the control of reformer mass flow rate, such as figure 1 shown.

[0051] The hydrocarbon feed to the reformer is a mixture of hydrocarbon 1 and hydrogen 2 . Both the hydrocarbon composition and the ratio of hydrocarbon flow to hydrogen flow will be different from one operating condition to another. The combined feed stream 3 is first measured in the flow orifice 4, which produces a mass flow rate in kg / h proportional to the product and in proportion to the actual volume flow m 3 / h signal 5. The downstream process stream then flows through a vortex element 6 which produces a flow proportional to the actual volume flow m 3 / h signal 7. Signals 5 and 6 go to calculating relay 8 which divides signal 5 by signal 7 to produce signal 9, the mass flow in kg / h. Signal 9 is used for flow controller 10 which controls the position of the flow valve.

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Abstract

A method for controlling mass flow of a hydrocarbon feed stream to a steam reformer said stream consisting of hydrogen and of natural gas, naphtha, off-gas, LPG, or a mixture hereof, and control molar carbon flow of a hydrocarbon feed stream and molar steam carbon ratio, comprising the steps of measurement of said process stream with a conventional differential pressure flow measuring element, providing a signal S' = k' x p x V<2>, measurement of same said process stream with a conventional vortex flow measuring element, providing a signal S'' = k'' x V, and determination of the mass flow and density of process stream from signals from both said flow measuring elements by the above formulae and M = p x V, as S' / S'' = k x rho x V = k x M and S' / (S'')<2> = k x rho .

Description

field of invention [0001] This invention relates to the measurement and control of the mass flow of process streams in which the chemical composition and even the density can vary significantly from one operating condition to another, especially where the mass flow must be kept constant during the operating condition change. [0002] The invention also relates to on-line determination of process stream density. [0003] The assay of the present invention produces only a small permanent pressure drop. Background technique [0004] Determination of mass flow and density can be obtained by different methods known in the art. [0005] One method of determining the mass flow rate of a combination of two or more streams is by measuring the volumetric flow rate of each stream through an orifice and analyzing the molecular weight of each stream. However, this approach is ineffective due to some time lag. [0006] In addition, another method is flow measurement to determine specif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32G01F1/34G01F1/36G01F1/88G01F5/00G01N9/26G01N9/32
CPCG01N9/32Y10T137/0391G01F1/36G01F1/3209
Inventor B·N·詹森T·奥尔森
Owner HALDOR TOPSOE AS
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