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Method for detecting sulfur content in fuel gas of combined cycle generator set

A technology of generator set and detection method, which is applied in the direction of volume flow ratio measurement, measurement device, liquid/fluid solid measurement, etc., can solve the problem of corrosion product deposition without taking measures to deal with sulfide and sulfur.

Active Publication Date: 2010-10-06
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] But in fact, after running for a period of time, significant sulfur corrosion and sulfur corrosion product deposition occurred on the gas working fluid flow surface of the unit. Obviously, the data of very small sulfide content in fuel gas obtained by the existing technology does not meet the requirements. In the actual situation, the equipment design based on this did not take measures to deal with sulfides, which led to a great passiveness after the unit was put into operation.

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  • Method for detecting sulfur content in fuel gas of combined cycle generator set
  • Method for detecting sulfur content in fuel gas of combined cycle generator set
  • Method for detecting sulfur content in fuel gas of combined cycle generator set

Examples

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Embodiment 1

[0059] A sampling hole is opened on the side wall of the waste heat boiler flue near the chimney, and the measured SO in the flue gas 2 The content is 30.2mg / m 3 , The fuel gas contains SO 2 The indicated sulfide content is 30.2*2.98=90.0mg / m 3 .

[0060] Among them: (Q smoke / Q burn) value 2.98 is calculated by the fixed method, and the calculation process is:

[0061] Check the rated parameters of a combined cycle generator set design book:

[0062] Fuel gas heating value 3266kJ / m 3 , Under rated conditions:

[0063] Fuel gas flow 362km 3 / h, air flow 718km 3 / h,

[0064] From this we get (Q smoke / Q burn)=(362+718) / 362=2.98

[0065] This value does not consider changes in actual operating conditions such as fuel gas heating value, and is fixed.

Embodiment 2

[0067] A sampling hole is opened on the side wall of the waste heat boiler flue near the chimney, and the measured SO in the flue gas 2 The content is 30.2mg / m 3 , The fuel gas contains SO 2 The indicated sulfide content is 30.2*2.90=87.6mg / m 3 .

[0068] Among them: (Q Smoke / Q Burn) value of 2.90 is calculated by the calculation method, and the calculation process is:

[0069] Read the actual value of the fuel gas flow and air flow of the running unit, the fuel gas flow is 100m 3 / h, air flow 198m 3 / h, CO 20% in fuel gas, H 2 1%, CH 4 0.2%;

[0070] CO+0.5O 2 →CO 2 ......Z1=0.5

[0071] H 2 +0.5O 2 →H 2 O ......Z2=1.5

[0072] CH 4 +2O 2 →2H 2 O+CO 2 ......Z3=4

[0073] Then: (Q smoke / Q burn)=1+Q air / Q burn-(C1*Z1+C2*Z2+C3*Z3)

[0074] =1+198 / 100-(0.20*0.5+0.01*1.5+0.002*4)

[0075] = 2.86

[0076] The air is also used to cool the gas turbine blades. After flowing out of the blades, the exhaust gas is mixed into the exhaust gas. This amount accounts for about 1 to 2% of the flue...

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Abstract

The invention relates to a technology for measuring sulfide content in fuel gas of a combined cycle generator set, in particular to a method for detecting sulfur content in fuel gas of a combined cycle generator set. The method comprises the following steps: 1) opening a sampling hole on a furnace wall in the low temperature region of the waste heat boiler of the combined cycle generator set, wherein the sampling hole is used for insertion of a flue gas analyzer sampling gun to detect the SO2 content (C smoke) in the flue gas; and 2) obtaining the sulfide, which is represented by SO2 in the flue gas, content (C flue) through calculation based on the proportional relation of a fuel gas standard volume flow (Q flue) and a smoke standard volume flow (Q smoke), wherein the calculation formula is as follows: C smoke=C flue*(Q smoke / Q flue). The invention can determine the sulfide content in the smoke by detecting SO2 in the flue gas in the gas duct of the waste heat boiler of the combined cycle generator set based on the relation determined by the smoke and fuel gas flow, thus providing important information for designing, operating and maintaining the combined cycle generator set.

Description

Technical field [0001] The invention relates to a measurement technology of the sulfide content in the fuel gas of a combined cycle generator set. Background technique [0002] The gas-steam combined cycle generator set has the technical advantages of high efficiency, high energy saving and low pollution, and has developed rapidly in recent years. In the combined cycle unit, the fuel gas entering the combustion chamber of the gas turbine, such as natural gas, coal gas, etc., is considered to be a clean fuel that contains basically no sulfur, so the gas turbine unit is a pollution-free unit. In addition, gas turbines also have other fuel gas sources, such as direct fuel oil, or IGCC, PFBC, CFB, and other types of coal-fired gas. These types of processes are all desulfurized, and there is no emission pollution. For example, there is no sulfur content in the fuel BFG composition analysis (design) report of the No. 0 generator set of a company; in the production process, SO 2 The an...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01F5/00
Inventor 陈天玲顾立群
Owner BAOSHAN IRON & STEEL CO LTD
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