zwns low nitrogen vacuum boiler -凯发平台

the principle of shangneng zwns type ultra-low nitrogen (nox<30mg/m3) vacuum boiler

water has a boiling point of 100°c at 1 bar. below 1 bar pressure, the boiling point of water is less than 100 °c. the pressure is 0.7 bar, the boiling point is 90° c.; the pressure is 0.3 bar, the boiling point is 70° c.; the pressure is 0.1 bar and the boiling point is 40° c.

the closed chamber of the vacuum hot water boiler is vacuum evacuated to form a vacuum chamber. the combustion causes the heat medium water to boil in the vacuum chamber to generate negative pressure water vapor, the steam condenses outside the heat exchanger tube, and the tube cold water is heated and heated. to the user, water vapor condenses to form water droplets and flows back to the heat medium water, which is heated and vaporized again. this completes the entire cycle, and the normal working pressure of the boiler is less than 0.7 bar. heat medium water is high-purity water treated with special treatment such as descaling, deoxidation, etc. it is filled by the factory before it is shipped. when it is used, closed circulation (vaporization-condensation-vaporization) inside the boiler is not added or reduced, and it is within the service life of the boiler. no need to add or replace.

the ultra-low nitrogen (nox<30mg/m3) vacuum hot water boiler is based on the three-way return of the original zwns type vacuum hot water boiler, and adopts a self-developed four-pass heat transfer structure (patent number: zl 2015 10428578.1), which is more efficient. high, using flue gas internal circulation flue gas external circulation burner (fgr), effectively reducing the temperature of the combustion reaction zone, and ultimately achieve ultra-low nitrogen emissions (nox <30mg/m3).

图1 高效超低氮燃气真热水锅炉示意图     

1. safe and reliable

when the unit is operating, the working temperature is lower than 90 "c, working pressure is less than 0.7 bar, and it is under negative pressure. it is safe and reliable. in order to fundamentally ensure the safe operation of the unit under negative pressure, the company adopted multiple safety protection measures in product design:

a. temperature protection device: there is a pt100 temperature sensor probe in the heat medium water in the boiler furnace, and it is connected with the plc electronic controller. when the temperature of the heat medium water exceeds the set temperature (<99°c), the burner is stopped to burn the boiler. it will automatically alarm, or automatically cut off the power supply of the vacuum hot water boiler.

b. overpressure protection device: a boiler body vacuum pressure controller is provided and connected with the plc electric controller. when the boiler internal pressure exceeds the set pressure (<0.045 mpa), the boiler will automatically alarm and stop the burner. or automatically cut off the vacuum hot water boiler power supply.

c. natural gas leakage alarm: when the boiler is running, the matching imported burner gas leak detection device can monitor the air leakage at any time. once it exceeds the limit, the gas solenoid valve will automatically shut down and alarm.

d. mechanical explosion-proof device: the top of the boiler is equipped with a mechanical overpressure device. when the pressure in the boiler exceeds the maximum pressure design value, the explosion-proof diaphragm inside the device will be punctured by the ejector pin to relieve pressure, thus fundamentally ensuring the safety of the boiler body. eliminates the possibility of a boiler explosion.

nd is connected with the plc electric controller. the boiler automatically alarms and stops the burner or automatically cuts off. vacuum hot water boiler power supply.

2. multi-purpose machine

each vacuum hot water boiler can be equipped with multiple heat exchangers to meet various needs of users, such as heating, sanitary water, process hot water and other uses in a single use.

3. high thermal efficiency

the boiler combustion method is a wet back three-pass front smoke chamber structure; the flue pipe adopts internal and external twin-screw winding fin tubes, which greatly reduces the temperature of the boiler smoke chamber, so that the boiler exhaust temperature is 120 °c ± 5 °c; built-in heat exchange the heat exchange tube of the device adopts a unique large wave section threaded tube structure, which improves the effect of the heat exchanger; the overall thermal efficiency of the boiler reaches more than 94.6%, and the various technical performance indexes far lead in the domestic market, thus realizing the establishment of china's vacuum hot water. boiler first brand goal.

4. simple system, easy installation, low nitrogen and low carbon energy saving

because the boiler heat medium water is filled once, no water is needed during operation, so the system does not need to be equipped with external equipment such as a water processor, soft water tank, heat exchanger, etc. it can be used simply by connecting the external piping, and the installation is simple and the cost is low. it also reduces the boiler house area. due to its high thermal efficiency, low operating costs, and high degree of automation, it can also reduce operator configuration and eliminate the need for annual inspections. therefore, the overall operation is simple, convenient, and energy-efficient.

5. high vacuum, never leak

during the product manufacturing process, a vacuum leak detection process (patent no. zl200920115379.5) with independent intellectual property rights was applied to conduct multiple vacuum leak detection procedures so that the product leakage index was < 10-10 pa·m3/s, and the vacuum was guaranteed after leaving the factory. never leak.

1. the pressure is less than 1bar, no need for approval, safe and reliable

2. has passed the national environmental certification, low carbon and low nitrogen, environmentally friendly

3. has a number of independent patents, trustworthy

4 can achieve no remote operation, saving people costs