Power Plant



Plate heat exchanger has a widely application in industrial area. The main market of the PHE including the following filed: Power Plants, HAVC, Machinery, Iron and Steel Plants, Petrochemicals.

1.POWER PLANT

Process Introduction
Thermal power plant using coal as primary energy adopts the belt-conveyor technology to transport the pulverized coal to the boiler. By the pulverized coal combustion, the water in boiler is turned into steam and it flows into the high-pressure cylinder after primary heating. To improve the thermal efficiency, it is necessary to reheat the steam and send it into the intermediate-pressure cylinder to drive the turbo generator to generate electricity. Then extract the steam from the intermediate-pressure cylinder into the symmetric low-pressure cylinder. Part of the steam which has done work is extracted in the middle section and sent to the brother enterprises such as oil refining and fertilizer enterprises, the other is cooled down by the condenser and turns into saturated water (about 40℃) used as recycled water. The saturated water (about 40℃) passes through the condensate pump and the low-pressure heater in which it is heated up to 160℃, then flows into the deaerator. After deoxization, use the feed pump to send it into the high-pressure heater which uses the reheated steam as heating fuel, and then the steam flows into the boiler for recycle. The above is the primary production flow.

Applications of plate heat exchanger
Oil cooler of gasoline engine: tubular oil cooler. Working principle: water flows from the water chamber into the steel pipe while the oil flows within the shell and outside the tube bundle. Water and oil exchange heat through the pipe wall.

Condenser: it is equipped with a large number of copper pipes. When the exhaust steam from the turbine contacts with outer surface of the pipe, it is cooled down by the circulating cooling water in the pipe, releases latent heat of vaporization which is continuously taken away through the pipe wall and turns into condensation water.

High pressure heater: surface heat exchanger, which is a mixing heater connected to the high-pressure feed pump and used to heat up the feedwater and improve economic efficiency. The heater inside is covered with slim tubes, with boiler feed water and condensation water inside and oil gas extracted from the turbine. Through heat transfer, the temperature of the feed water and condensation water increases while the oil gas is condensed into water extraction and renders hydrophobic, which of the high-pressure heaters generally flows into the high-pressure deaerator and which of the-low pressure heater is pumped into condenser by the drainage pump.

Low-pressure heater: it is connected to the sealing heater and used to heat up the condensation water in the high-pressure deaerator and improve economic efficiency.

Desulfurization system

Air preheater: it is a rotary heat exchanger and a regenerative heat exchanger operating in countercurrent. Heat storage elements with special corrugations are closely placed in fan-shaped rotor chambers where the rotor rotates at 0.96 rpm and there are exhaust-gas channel and air channel in the left and right side. The air channel is divided into primary and secondary air channel. When flowing through the rotor, the exhaust gas releases heat to the heat storage elements which reduce its temperature. When the heat storage elements rotate to the air side, it releases heat to the air and increase its temperature. This constant circulation achieves the heat exchange between the exhaust gas and the air.

Slag cooler: it is mainly composed by the double-layer sealing sleeve welded with the fixed spiral blade inside the internal cylinder, the inlet and outlet slag device, the inlet and outlet water device, transmission device and base system. When the slag cooler driven by the transmission rotates slowly, the high-temperature slag exhausted from the boiler is guided forward in the internal cylinder of the sleeve. The cooling water flowing reversely in the jacket between the internal and external cylinder takes away heat and gradually cools down the hot slag.

The air cooler in the generator: using air as a cooling medium and cooling down the stator, rotor windings and a stator core. There are generally two kinds of cooling modes: open-circuit ventilation and closed cycle. Open-circuit ventilation directly using the air around the generator as a cooling medium is generally composed of air suction inlet, filter, inlet, outlet muffler and outlet air channel. The air is suctioned by the fan and sent to the generator's heating parts for cooling, and then exhausted through the outlet muffler and air channel. This cooling mode costs less, but it is only applied in the conditions where the ambient air is clean, contains no salt spray and its temperature relatively low, otherwise it will lead to the blockage in the channel or the corrosion of the medal parts (such as retaining ring) which affects the safe operation. The cooling air of a closed-cycled generator runs in a closed cycle in the cooling system, thus it is necessary to install a air-water cooler to take away the heat in the air.

Fans with hydraulic coupling and pumps (such as feed pump, blower, draught fan) are generally supplied with the main equipment. There are many applications of the cooler in power plant:  furnace sampling (cooling water sample), and cooling of the wind machine and the motor bearing (blower, draught fan, water pump, air compressor, etc.) adopt oil-cooling mode and the oil station adopts the water-cooling mode. Central air-conditioning system (over 20 kinds)

 

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  • Method for cleaning vicarb heat exchanger plate


    Vicarb heat exchanger plates have been widely used in some areas such as central heating and chemical industry. The plate heat exchanger has a good heat exchange effect, but it is prone to produce scale and impurities, which will block the flow of the plate heat exchanger and reduce the heat exchange effect. So, how to clean the plate heat exchanger?Plate heat exchangers can be disassembled and recirculated.

    Disassembly and cleaning steps:
    Disassembly and cleaning can clean both processes of the heat exchanger. The main steps are:
    1. Close the two water inlet and outlet valves of the heat exchanger;

    2. Measure the distance between the baffles of the heat exchanger and make a record;

    3. Disassemble the plate heat exchanger, empty the medium in the equipment, disassemble in the prescribed order, and make a record. Be careful not to damage the gasket and the plate during the disassembly process;

    4. During the cleaning process, the plates should be cleaned piece by piece, and soaked and washed. In the case of high-pressure cleaning, the cleaning should be performed below the specified pressure;

    5. After processing, put it back in the plate heat exchanger baffle in the original order, paying attention to distinguish the front and back. Control the strength when tightening the clamping bolts firmly, otherwise it is easy to crush the plate;

    6. Open the outlet valve and inlet valve of the plate heat exchanger to see if there is any leakage. If there is no leakage, the cleaning is complete.

    Cycle cleaning steps:
    If it is used in the chemical industry, firstly close the inlet and outlet valves of the plate heat exchanger, and add the cleaning agent to the system through a tube pump or a water tank for internal circulation until the concentration of the cleaning agent no longer changes and the impurities in the equipment are discharged.

    If it is a passivation treatment, it is necessary to ensure that after the chemical descaling is completed, no rust or other phenomena will occur in the pipeline. The amount of passivation cleaning solution needs to be determined according to the amount of water during cleaning, and the ph value cannot be too high, otherwise the effect will be poor, and it will be discharged after six hours.

    Finally, the plate heat exchanger was restored, and the inlet and outlet water valves were opened, indicating that the cleaning was completed.
  • The role and advantages,disadvantages of plate heat exchangers


    Plate heat exchangers are a type of mobile device that transfers heat between metal plates because the liquid is spread over more surfaces, which increases the exchange rate. Metal tubes are used to heat fluids.

    The role of plate heat exchangers
    The plate heat exchanger is based on different external and internal components, the welding plate exchange plates are welded together, and the brazed plate type construction model is vacuum brazed. In many cases, in order to make smaller sections work better, some chambers are designed to be thinner, allowing most of the liquid to contact the plate, improving heat transfer.

    The plate heat exchanger can play a good heat transfer effect in the boiler heating in winter. In the daily use process, it is necessary to do a good job of protecting this equipment. The plate heat exchanger is a kind of equipment that can play multiple benefits and functions for us. The user clearly knows its role and protects it so that it can play a greater role.

    Advantages of plate heat exchangers
    High heat transfer coefficient. The plate heat exchanger has a small flow channel, the plates are wavy, and the cross-section changes are complex, which makes the flow direction and velocity of the fluid constantly change, which increases the disturbance of the fluid and has a high heat transfer coefficient.

    Great adaptability. The required heat transfer area can be achieved by increasing or decreasing the plate. A heat exchanger can be divided into several units, which can be used for heating or cooling between several fluids at the same time.

    Compact structure, small size and few consumables. The heat transfer area per cubic meter volume can reach 250m2, and the heat transfer surface per square meter only needs about 15kg of metal.

    Dirt factor is small. Due to the large flow disturbance, dirt is not easily deposited. The plate heat exchanger plate is of good material and has little corrosion, which makes its fouling coefficient value smaller. Plate heat exchangers mainly use metal plates, so the price of raw materials is cheaper than the same metal pipes.

    Disadvantages of plate heat exchangers
    1) Poor sealing and easy to leak. The gasket needs to be replaced frequently, which is troublesome.
    2) The use pressure is limited, and generally does not exceed 1MPa.
    3) The use temperature is limited by the temperature resistance of the gasket material.
  • Gasketed Plate Heat Exchanger VHX151


    VHX supply gasketed plate heat exchangers from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.

    gasketed plate heat exchanger

     
    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
    VHX52 920 320 25 450 640 140 DN50
    VHX61 835 325 50 630 625 130 DN65
    VHX62 1085 325 50 630 875 130 DN65
    VHX101 1084 470 120 950 719 225 DN100
    VHX102 1084 470 80 640 719 225 DN100
    VHX103 1235 500 115 1125 882 234 DN100
    VHX104 1655 500 115 1125 1302 234 DN100
    VHX151 1885 650 235 1410 1294 298 DN150
    VHX152 1885 610 160 1255 1294 298 DN150
    VHX201 2055 730 235 1645 1478 342 DN200
    VHX301 2086 1125 215 2580 1320 600 DN300
    VHX351 2920 1190 210 3360 1842 596 DN350
    Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
    Available connection material: rubber/stainless steel/unlined/flange


     
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    VHX supply plate heat exchangers from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.
     Thermowave Plate Heat Exchanger Gasket
    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
    VHX52 920 320 25 450 640 140 DN50
    VHX61 835 325 50 630 625 130 DN65
    VHX62 1085 325 50 630 875 130 DN65
    VHX101 1084 470 120 950 719 225 DN100
    VHX102 1084 470 80 640 719 225 DN100
    VHX103 1235 500 115 1125 882 234 DN100
    VHX104 1655 500 115 1125 1302 234 DN100
    VHX151 1885 650 235 1410 1294 298 DN150
    VHX152 1885 610 160 1255 1294 298 DN150
    VHX201 2055 730 235 1645 1478 342 DN200
    VHX301 2086 1125 215 2580 1320 600 DN300
    VHX351 2920 1190 210 3360 1842 596 DN350
    Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
    Available connection material: rubber/stainless steel/unlined/flange


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    VHX supply heat exchanger plates from 0.03m2 to 1.8m2 for different application requirements. We manufacture plate heat exhcanger for replacement models and our own brand models, available calibre from DN25 to DN350.

     
    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
    VHX52 920 320 25 450 640 140 DN50
    VHX61 835 325 50 630 625 130 DN65
    VHX62 1085 325 50 630 875 130 DN65
    VHX101 1084 470 120 950 719 225 DN100
    VHX102 1084 470 80 640 719 225 DN100
    VHX103 1235 500 115 1125 882 234 DN100
    VHX104 1655 500 115 1125 1302 234 DN100
    VHX151 1885 650 235 1410 1294 298 DN150
    VHX152 1885 610 160 1255 1294 298 DN150
    VHX201 2055 730 235 1645 1478 342 DN200
    VHX301 2086 1125 215 2580 1320 600 DN300
    VHX351 2920 1190 210 3360 1842 596 DN350
    Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
    Available connection material: rubber/stainless steel/unlined/flange