Biogas Flare Stacks

7/29/2019 Biogas Flare Stacks

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BIOGAS


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BIOGAS FLARE STACKS

HT-S Type are high-performance enclosed ground flare stacks where biogas combustion temperature,

flame retention time and destruction efficiency are the results to be achieved. Combustion occurs inside

the base refractory combustion chamber and is completed in the upper cylindrical chamber lined with

fiberceramic, under a controlled environment. Air flow is admitted into the combustion chamberthrough a motorized damper, depending on the combustion temperature set-point. An outer shield

provides additional protection against radiant heat loss. The flare stack is supplied complete with gas

train, control box fitted with touch-screen panel for operation setting and control, flame arrestor, safety

devices, automatic air damper, thermocouple and combustion temperature control system. Operation is

fully automatic.

BIOGAS FILTER

Condensate/sediment traps are designed to remove liquids and solids from biological gas, and are

installed immediately downstream from each digester to remove the large volume of condensed water,

and upstream from energy recovery plants. First-stage removal is accomplished by a combination ofcentrifugal force and a sharp drop in velocity as the gas enters the trap. Second-stage removal takes

place in a stainless steel mesh where smaller size particles are separated from biological gas flow. An

external water trap device allows for continuous disposal of condensate water


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BIOGAS DRYING

Biogas from anaerobic digestion is saturated with water vapour that has a significant negative impact on

the performance of energy recovery units. Removal of moisture is achieved by means of cooling down

the biogas flow so that moisture turns into condensate water that can be easily separated, collected and

discharged. The system is based on an air-cooled fully automatic water chiller and a water/biogas heat

exchanger. The two units are connected by a recirculating water+glicole hydraulic circuit. Condensate

water separated in the heat exchanger is collected inside a knock-out drum from which is automatically

disposed. The system is designed as package unit; chiller is supplied separately, for installation in non-hazardous area.


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SCRUBBER

Scrubber units UTB are the basic option for removal of biogas typical contaminants like hydrogen

sulphyde (H2S) and are characterized by simple design and operation. Biogas is washed with a water-

NaOH solution. In order to achieve a high purification efficiency, the washing solution and biogas are

kept mixed as long as possible: in the first stage inside a venture jet, in the second stage through the

layer of filling bodies which are continuously sprayed by nozzles with the washing solution. The system is

designed as package unit and the standard version is supplied fitted with on mount electric control

panel.


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BIOGAS ANALYSIS EQUIPMENT

Biogas analysis assists process control and can help to optimise digester operation and maximize

methane production. It can also ensure newly installed biogas plant is operating to design specification.

PROGECO includes in its scope of supply hand held portable instruments and fixed continuous and

automated equipment for analysis of methane (CH4), oxygen (O2), carbon dioxide (CO2), hydrogen

sulphyde (H2S) in biogas. Data can be stored or sent to remote PC / SCADA system.

INSTRUMENTS SCOPE METHANE CAPTURE PROJECT


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General

The Scope represents a complete design and supply comprising instruments,control panels,power

supplies, all connecting cables, including UPS, Voltage Spike protection, data loggers and panel displays

The scope of supply covers :

1. Quantity 3 of remote mounted Magnetic Flow Meter DMH KOBOLD size DN 100

2. Quantity 2 of Gas Volume Flow Meters DOG KOBOLD a flow pulsation measurement principle, with

temperature TWL KOBOLD and Pressure Transmitter PAS KOBOLD compensation

3. Gas Composition meters,ideally one meter with automatic gas supply switching between two gas

sources

4. PLC for Valve operation

5. Data Logging

6. Gas Conditioning


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7. Electrical Panel

The Panels are to be self - contained and sealed against the ingress of H2S that may be in the

environment at a low level. The Scope of supply shall be point - to point tested and simulated prior to

shipment. Key spare part are to be nominated and included. All instruments to be provided with

calibration test certificate. Equipment for gas composition analysis that may contain gas or leak gasshould be separate from other panels to keep gas away from electronics component

INSTALLATION

Physical installation of field items will be by pipe fitters. Electrical installation will be by electricians as

may be expected to be present in a palm oil mill or equipment. There shall be clear installation

instructions in English and diagrams, annotated photographs or similiar illustrations where - ever

possible. Installation is to be limited to physical placement and the panel, and the supply of power

All field devices installed in pipe - work shall have a specified JIS Flange connection. Pipe spools is

stainless steel shall contain the set of instruments required for flow measurement and sampling

Included in the panel is to be a PLC with program according to a functional description provided. The PLC

shall operate numbers of butterfly valves on time basis

Multicore cable suitable for connection to valve solenoid shall be included

MAGNETIC FLOW METERS

Type : Magnetic Flow Meter

Size : DN 100

Requirement : Displays instantaneous and integrated flow capable of 4 - 20 mA output ( but currently

this is not required) Maximum Flow 75 m3/hr, may be operated at 80 Deg C

A grounding Ring is required as the pipe is HDPE

Protection Class : IP67

Each flow meter should come as a package in ne stainless steel pipe spool, so that there is a flanged pipe

connection using JIS Flange specifications at the meter should be present in the stainless pipe that

exaclymatches the meter bore

The power supply to the meter shall be provided in a panel. 4 - 20 mA signal from Magnetic Flow Meter

is not required

GAS FLOW METERS

Type : Volume flow flow pulsation measurement principle with temperature and preesure

compensation


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Size : DN 150 operating at about 20 - 800 mbar

Gas quality : Wet unclean biogas containing up to 4000 mg/litre H2S, nomally 60% Methane,2% Oxygen,

balance carbon dioxide and nitrogen

Flow : up 3000 m3/hr

Ex-Proof Class : Suitable for biogas service

Protections Class : IP67

Pressure Rating : PN 16

Process Temperature : 30 - 55 C

Output Requirement : Instantaneous display of Nm3/hr, pressure and temperature

Data Logged recording recording of normalised flow pressure and temperature flow pressure transducer

and temperaure transmitter output 4 - 20 mA Signals

Each gas flow meter with temperature and pressure sensing should come as a complete package in one

stainless steel pipe spool so that there is only a flanged pipe connection using JIS flange specifications at

the meter pipe size.

The minimum straight length of pipe upstream /downstream of the meter should be present in the

stainless pipe that exactly macthes the meter bore

GAS COMPOSITIONS MONITOR

A multi -channel gas monitor will monitor two gas streams. one stream will be raw biogas where the

H2S would be arround 2.500 ppm and saturated humidity. the other stream a scrubbed dehumidified

biogas where the humidity would usually be about 40% and the H2S about 150 ppm If is necessary to

switch to an air flow for a ime to refresh the sensors ( especially the H2Sinstruments) then that facility

must be included

All tagged streams shall be individually monitored and data logged

The Gas composition monitor will contain the following component

Gas suction pump, condensate trap, electronic flow rate monitoring , flame arrester

Gas cooler

Silica gel- bassed water trap or smiliar to indicate the gas drier is working WT 20,5 for 4/6 mm hose

connection isteated of silica gel

Switched to change between gas flows ( stream 1 and stream 2 or between a gas stream and air )


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Sensors :

Methane , 0 to 100% v/v

Hydrogen Sulphide 0 to 3000 ppm

Hydrogen Sulphide 0 to 500 ppm

Oxygen 0 - 25%

Carbon Doxide 0 to 100%

PROGRAMMABLE LOGIC CONTROLLER

It is required to operate valves ( provided by others) The PLC shall be provided with Relay output so that

the valve solenoid may be of either 24 VDC or 24 VAC types

PLC shall have a touch screen interface. The PLC should allow for 100 Digital outputs and will be

programmed according to a functional description provided

The PLC will be protected by surge suppression an a UPS

PANEL - GAS HANDLING

Stainless Steel outdoor type meeting IP 65 standard containing :

Lighting Surge Arrester

Switch Power Supply 24 VDC 120 Watt 5A

Lighting

UPS 1 KVA

Power Plug for Service Porpose 16P+PE

Circuit Breaker for each instrument 2P 2A

Indicator Lamps

Gas Instrumentation

PANEL LIQUID FLOW

Stainless Steel outdoor type meeting IP 65 standard containing :


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Lighting Surge Arrester

Switch Power Supply 24 VDC 120 Watt 5A

Lighting

UPS 1 KVA

The gas flow meters shall a display at the panel one display per tag. USB interface downloading of the

data be available without opening the panel door. Data logging may be provided from a separate (

control room) panel i preparred be the supplier

CABLE

All field items shall have power supplies provide from their respective panels, Assume an average

distance from the panel 0f 80 meter per instrument

Valve operated by the PLC required a signal cable

Please provide for 1000 meter of multicore and with 12 or 16 pairs in the multicore

REFERENCE GAS

A bottle of dry reference gas suitable for checking the instruments is to be provided. The reference gas

proposed to contain 60% CH4,1%O2,500 ppm H2S, Balanced CO2. It must be accompanied by a

certificate specifiying the composition and accuracy limits of the composition

Documents

Biogas Flare Stacks