Plate heat exchanger - Shandong heat exchanger - Plate heat exchanger plate - Vertical plate heat exchanger

Shandong Youkun Energy Equipment Co., Ltd. is a manufacturer of heat exchangers, including plate heat exchangers, volumetric heat exchangers, helical coil heat exchangers, annular heat exchangers, floating head heat exchangers, low-pressure heat exchangers, and heating heat exchangers. The company's main products include nine categories: heat exchangers, plate heat exchangers, heat exchanger units, pressure vessels, boiler auxiliary equipment, water supply equipment, water treatment equipment, reverse osmosis devices, wastewater treatment equipment, and fully intelligent oil, gas, and electric boilers. Heat exchangers, plate heat exchangers, and heat exchanger units are suitable for sanitary hot water in residential, government, factory, hospital, hotel, and school settings. Integral heat exchanger units can be used for both water-to-water and steam-to-water exchange. For high-quality heat exchanger units, Youkun is a reliable choice.

Plate heat exchangers have advantages such as high heat transfer coefficient, compact structure, small footprint, flexible operation, wide application range, low thermal resistance loss, convenient installation and use, and low investment cost. Therefore, they are widely used in petroleum, chemical, thermal power, metallurgy, light textile, food, medicine, HVAC heating, nuclear industry, shipbuilding, and marine development fields.

With the development of modern industry, the rational use of energy and environmental protection are the primary issues to be addressed by countries worldwide. Plate heat exchangers, as a highly efficient heat exchange product in the heat exchange field, have already attracted the attention of manufacturers both domestically and internationally. Our company has learned from and absorbed the advanced technologies of similar industries at home and abroad, and has cooperated with universities to research and develop highly efficient, durable plate heat exchangers with internationally advanced levels. The plates use a unique anti-sticking pad structure, and the plate processing uses a unique process, increasing the working pressure, temperature, and service life of the plate heat exchanger. We have independently developed plate types suitable for different media and flow rates, expanding the application range, greatly reducing the investment cost, and improving the heat transfer coefficient. Using industrial automatic assembly lines improves product quality and enhances reliability and reputation, receiving high praise from users.

A plate heat exchanger is mainly composed of heat transfer plates, sealing gaskets, pressure plates, upper and lower guide rods, columns, clamping studs, and bolts. The four corners of the heat transfer plates have corner holes and inlaid sealing gaskets. When the equipment is clamped, the sealing gaskets are sealed and connected according to the process combination form, and the corner holes are interconnected to form a maze-like medium channel, allowing the heat exchange medium to flow in reverse in adjacent channels, and to perform sufficient heat exchange through enhanced heat convection and heat conduction.

Plate Heat Exchanger Installation

1. After unpacking the equipment, you should check each item according to the items listed in the delivery list. If there are any non-conforming items, you should immediately inform our company so that they can be resolved in a timely manner.

2. The equipment is equipped with lifting rings for lifting. Before lifting, select the lifting equipment according to the weight indicated on the nameplate.

3. The equipment should be installed horizontally in a place that is not blocked by pipes or other equipment, ensuring that there is approximately 1 meter of space around the equipment for maintenance and repair.

4. The pump transporting liquid into the equipment should be equipped with a throttle valve; if the maximum outlet pressure of the pump is greater than the maximum pressure of the equipment, a safety pressure relief valve should be installed.

5. If installing stop valves, throttle valves, pressure reducing valves, or pressure control valves, they should be installed at the inlet of the equipment and not at the outlet.

6. Before installation, the inlet and outlet pipes of the equipment should be cleaned to prevent sand, oil, welding slag, and other debris from entering the equipment, which may cause internal blockage or damage to the plates. It is best to install a filter before the equipment inlet to prevent various impurities from entering the equipment and causing blockages. For customers in areas with poor water quality, a descaling device should be installed before the equipment to ensure the heat transfer effect and keep the equipment in optimal condition.

7. Sealing gaskets should be added to the pipe flanges, and the sealing gaskets should be accurately placed in the center of the flange.

8. The water entering the equipment should be softened, which can improve the heat exchange efficiency and extend the service life of the equipment.

9. A bypass should be added to the inlet and outlet of the equipment. When the equipment is running for the first time, the water in the system can be circulated and drained, and the bypass valve system can be officially operated after the water quality in the system meets the requirements.

10. Pressure gauges should be installed on the inlet and outlet pipes of the heat exchanger to monitor the operating status of the heat exchanger and determine the cleaning time.

11. When the heat exchanger interface is connected to the pipeline, the pipe port table in the heat exchanger drawing should be followed to avoid the heat exchanger pipe being subjected to pipeline expansion and contraction stress. Make markings after installation is complete.

Plate Heat Exchanger Operation

1. Before the equipment is running, check whether all bolts are loose. If loose, tighten to the clamping size first.

2. Before starting, open all outlet valves of the heat exchanger and close the inlet valve of the heat exchanger. After starting the pump, slowly open the inlet valve of the heat exchanger and gradually increase the pressure to avoid instantaneous impact and local high pressure damaging the equipment.

3. When the heat exchanger is running, to prevent overpressure on one side, the inlet valves of the cold and hot media entering the heat exchanger should be opened at the same time, or the low-pressure side fluid should be injected slowly first, and then the high-pressure fluid should be injected slowly.

4. According to the indicators of the inlet and outlet thermometers of the heat exchanger, use the throttle valve to control the flow rate of the cold and hot fluids to achieve the required process parameters and stable operation.

5. When the heat exchanger stops for any reason, the operating procedures should be carried out in reverse order of the startup.

6. When performing steam-liquid heat exchange, the gas passage side should be single-flow, and the inlet should be at the top.

7. Equipment used in the food industry should be thoroughly cleaned and disinfected before use. Hot water can be used for cleaning to remove air, oil, and debris from the equipment.

8. Air release valves should be installed in the pipeline system. After starting up, the air in the equipment should be removed to prevent air from remaining in the equipment and reducing the heat transfer effect.

9. When the temperature difference between the two media is large, the low-temperature medium can be passed in first, followed by the high-temperature medium. In the event of shutdown or power failure, the inlet valve of the high-temperature medium should be immediately closed (its matching valve must be well sealed and not allowed to leak, to avoid the gasket being without heat exchange under high temperature and prematurely aging), and then the low-temperature medium should be closed.

10. If the hot and cold media contain large particles of mud, sand, or other debris, they should be filtered first. The use of wastewater for hydrostatic testing and operation is prohibited to prevent affecting the service life of the equipment. (Our company specializes in producing various types of filters to match this; please specify when ordering).

Plate Heat Exchanger Maintenance

At the location where the heat exchanger operates, appropriately scaled and calibrated pressure gauges, sensors, thermometers, flow meters, and other instruments should be installed on the inlet and outlet pipelines of the heat exchanger. The operating status of the heat exchanger should be determined based on the instrument readings. When the heat exchanger operates for a long time, scale or deposits will form on the plate surface to varying degrees, increasing flow resistance and reducing heat transfer performance. Therefore, a running cycle must be established based on the actual state of the water quality or medium for regular inspection and cleaning. During cleaning, mechanical or chemical cleaning can be used.

1. Mechanical Cleaning

(1) Loosen the heat exchanger, remove the clamping bolts, and move the movable clamping plate towards the support to create some distance between the plates. Then, cleaning can be performed. If it is necessary to replace the sealing gaskets and damaged plates, the upper end of the plate should be tilted towards the movable clamping plate, then removed from the hanging beam hanging port, and the lower end of the plate should also be separated from the lower beam before removing the plate.

(2) For some operating media in the chemical industry, solid substances are generated due to the influence of temperature or chemical reactions. Their composition must be analyzed, and appropriate cleaning agents must be configured for washing or steaming.

(3) When cleaning the plates, use a palm brush or fiber brush. Do not use a wire brush to avoid scratching the plates and reducing corrosion resistance.

(4) When cleaning the sealing gaskets, be careful to prevent scratching the gaskets.

(5) After brushing the plates, rinse them with clean water and wipe the plates and sealing gaskets clean with a clean cloth or cotton yarn to ensure that no solid particles remain.

(6) When assembling the heat exchanger, assemble it according to the process and check whether the arrangement of the plates is correct.

(7) Damaged plates and aged gaskets should be replaced.

(8) When clamping the plates, the diagonal order should be followed to ensure that the upper and lower and left and right distance deviations of the two clamping plates are not more than 8.0 mm. When clamped to the given clamping size, the deviation must be less than 2.0 mm. After clamping, the corner bolts can be tightened.

(9) Hydrostatic Test: After equipment maintenance, a hydrostatic test should be performed. No external leakage or internal leakage indicates that it has passed. The steps are as follows:

a) Check if the clamping dimensions meet the sample requirements.
b) Install the blind plate and pressure test pump, and install a pressure gauge at the pressure test pump port.
c) Use an appropriate medium (generally softened water with a chloride ion content of less than 5%) for pressure testing.
d) Completely exhaust the air from the equipment, and perform unilateral pressure testing at 1.25 times the design pressure, maintaining pressure.

(10) Leakage Causes

a) Medium internal leakage: This is caused by plate corrosion or gasket aging.
b) Medium external leakage: This is caused by aging or improper assembly of the sealing gasket.

2. Chemical Cleaning

Chemical cleaning can be performed without disassembling the plates. First, close the system inlet and outlet valves, connect a cleaning system to the heat exchanger connection pipe, and circulate the corresponding cleaning medium in each side flow path. After the fouling is sufficiently softened and detached, open the drain to drain it, and then rinse it with clean water.
Note: The selected cleaning solution should not damage the plate material or sealing gasket.

Plate Heat Exchanger Maintenance

1. Heat exchangers that are shut down seasonally should have the medium inside the equipment drained promptly, or other antifreeze measures should be taken to prevent the equipment from freezing.

2. If the equipment is not used for a long time, the clamping bolts should be loosened to a size not less than 1.15L. When using it, tighten it according to the requirements.

3. During normal operation of the equipment, if a medium is found flowing out at the signal hole, it should be analyzed. If the bolts are loose or elongated due to long-term heat exchange, they should be re-tightened as required, but not too tight to avoid damaging the plates. If the sealing gasket is aged, it should be replaced.