Product Principle
HTECH heat exchange unit is an electromechanical equipment integrating heat exchanger, circulation pump, water supply pump, instrument, sensor, electrical control and valve pipeline. It also carries out scientific calculations and optimized designs. It has the advantages of sophisticated hardware configuration, reasonable structural layout, advanced control system, convenient operation and management, and saving operating costs. It can provide integrated heat exchange comprehensive solutions for users with different needs. It has been widely used It is applied to many fields such as district heating/cooling system, domestic hot water system, waste heat recovery, seawater desalination process cooling system and so on.
Product advantages
Professional design
Integrating the design of thermal machinery, process instruments, network communications, electrical control, etc., it can provide customized solutions for different users Optimize the hardware and software design of the heat exchange unit and tailor it to meet the different working conditions of users.
More stable quality
Industrial production, complete machine design, complete machine production, complete machine testing, and strictly abide by the ISO9001 international quality system, covering design control, procurement control, and production process Control, finished product inspection and product safety control and other process links ensure the stability and reliability of the quality of the heat exchange unit.
More cost-effective
The compact structure can greatly save the machine room area and infrastructure costs. It has been strictly tested before leaving the factory. It only needs flange connection on site and it can be put into operation after starting up, reducing the need for on-site Installation project costs and shorten the project construction cycle.
Easier operation and management
Humanized human-machine interface makes operation and management convenient. The advanced and mature control system has low failure rate, low maintenance and energy-saving operation, which can truly realize unattended safe operation and remote monitoring.
Working principle
Adjustment method
◆ Quality adjustment changes the supply temperature of the secondary side circulating water by adjusting the flow rate of the primary side heat source. Control program secondary The signal from the side water supply temperature and outdoor temperature sensor is used to adjust the opening of the primary side electric regulating valve and change the flow of the heat source to achieve the purpose of adjusting the heat load of the heating system and saving heat energy.
◆ Volume adjustment The flow rate of the secondary side circulating water pump is adjusted through the frequency converter to achieve the purpose of adjusting the heat load. Although it saves operating costs, it can easily cause hydraulic imbalance.
◆ Quality adjustment adjusts the heat source flow through the electric valve, and adjusts the secondary side flow of the circulating water pump through the frequency converter to achieve simultaneous regulation of the temperature and flow of the secondary side circulating water. This method can not only save heat energy , electric energy, and easy to manage.
Water replenishment method
◆ Constant pressure water replenishment Use a constant pressure tank to replenish water and pressure in the system. When the system water pressure reaches the upper or lower limit, the air pressure tank can be used to control the start and stop of the water replenishing pump, so that the system pressure and temperature fluctuate less.
◆ Frequency conversion water replenishment The pressure sensor on the secondary side return pipe knows the pressure signal, and the controller controls the speed of the water replenishment pump through the frequency converter based on the signal to achieve the purpose of changing the flow rate.
Control method
The HZ intelligent heat exchange unit controller monitors the outdoor temperature, pressure, temperature, flow, current, voltage, electricity and other parameters of the primary and secondary side pipe networks. , control the opening of the primary side regulating valve, the speed of the secondary side circulation pump, water supply pump and the number of operating pumps, etc., to achieve the social effect of good quality central heating and the purpose of low-cost and economical operation of the thermal station. According to the needs of users, we can provide three different control methods: a manual control b automatic control c remote control
Control solutions to meet different user needs
Handai heating network control Experts use the world's most advanced German Siemens intelligent control system and combine it with China's actual heat exchange conditions to conduct secondary development to provide the best solutions for users with different needs.
Temperature control scheme
Through outdoor temperature changes and the set empirical adjustment curve, temperature compensation is performed, the primary side electric regulating valve is automatically controlled, and the secondary side water supply temperature is controlled to meet the requirements Heat load changes to achieve energy-saving and comfortable operation.
On-site fully automatic unattended control scheme
Control the water supply temperature of the secondary network through the electric regulating valve of the primary network, and can perform outdoor temperature compensation function. According to the supply and return water of the secondary network The pressure difference or temperature difference is used as a feedback signal, the circulation pump adopts variable frequency control, and the secondary network realizes variable flow control, so the heat exchange unit can operate in an energy-saving state of "large temperature difference, small flow". According to the secondary network return water pressure as a feedback signal, the water replenishment pump adopts variable frequency replenishment; the replenishment tank liquid level sensor can automatically control the water tank liquid level and has a low liquid level protection function; the secondary return water pipeline can be equipped with a pressure relief solenoid valve. If the secondary return water pressure exceeds the set value, the solenoid valve automatically opens to relieve the pressure to a safe value and then closes automatically. After the unit is turned on, it can automatically run according to the preset program, and the manager only needs to inspect the unit regularly.
Remote monitoring automatic unattended control scheme
In addition to the above control functions, the heat exchange unit that chooses this control method also has remote communication functions, and different communication methods can be selected. : Wired (telephone dial-up, ADSL, broadband communication, etc.) or wireless (GPRS, etc.), and supports a wide range of communication protocols (Ethernet, PPP protocol, TCP/IP protocol, etc.). Through the above communication mode, the temperature, pressure, flow rate of the primary and secondary sides of the heat exchange unit, the outdoor temperature and indoor temperature, the operating status and operating frequency of the circulation pump and water supply pump, the opening of the electric regulating valve and other unit parameters can be reported in real time. Upload to the central management station, or connect with the building automation system (BAS), to monitor the operating status of the heat exchange unit online, and have alarms for ultra-high water supply temperature, low return water pressure, and low water tank level. Water supply pressure over-pressure alarm, over-pressure automatic pressure relief, automatic power-off protection and linkage and other functions. Through the two-way communication between the upper computer in the monitoring center and the on-site controller, managers can optimize and set the control parameters of the unit to ensure that the heat exchange unit is always in the best condition and everything is under control.
Unit configuration
Plate heat exchanger: Danish SONDEX/Shandong Handai
Internationally renowned brand, environmentally friendly and energy-saving
The most abundant Plate design combination, more than 60 plate types, comprehensive coverage of thermal working conditions
Unique plate design can produce turbulence at low flow speeds and has low scaling tendency
Patented import Diversion area, balanced fluid distribution, avoiding flow dead corners
SONDEX LOCK super seal and sealing groove, using non-stick and non-leakage bayonet type gasket, extending the life of the constant pressure tank
Constant pressure tank : Italy ZILMET
Using butyl rubber or natural rubber or bladder, large deformation
High absorption expansion rate, small size, beautiful appearance
Water pump: Denmark Grundfos
Excellent processing, energy saving, low noise, wide operating temperature range, long life, stable and reliable operation
Control system: German Siemens
PLC controller , compact structure, good expansibility, LCD display, freely settable, excellent performance
PID adjustment, energy saving and heat saving, automatic fault analysis and sound and light alarm, optional color touch screen and remote control and Networked with BA system
Inverter: Swiss ABB/Germany Siemens
Using special inverters for pumps and fans, precise control, no signal drift, stable and reliable, energy-saving, safe and reliable , long service life Steam system: British Sprax Sarco
Sensitive operation, excellent quality, safety and stability, long life
Water side valve: Denmark Danfoss/Tianjin WATTS
Safe and convenient, easy to operate, lifetime maintenance-free, zero leakage
Application fields
Central heating, district heating, building heating, domestic hot water, geothermal utilization, air conditioning and refrigeration, Seawater desalination, circulating cooling, petrochemical industry, food and medicine, and various places requiring heat exchange