The unit combination form of the dosing device mainly depends on the capacity of the unit, the configuration of the boiler (one set for two furnaces or a single set for a single furnace, etc.), the level of automation (automatic or manual control), and the selection of the type of dosing pump (AC Or tributary motor, imported or domestic pump) flexibly form units of various forms, which are installed on a base. This factory-made complete set of devices greatly reduces the workload of design and on-site installation and has a great impact on the quality and safety of the whole machine. And on-site operation provides a reliable guarantee.
Classification
1. Boiler water plus phosphate system:
The preparation system of phosphate solution shows that trisodium phosphate is directly added to the solution tank for stirring configuration, and a 4m3 dissolving tank can also be set up, and the infusion pump first circulates and stirs, and then enters the solution tank.
In addition to manual control, the control of the amount of phosphate added can also be automatically controlled: according to the sampling signal of the phosphate table of the boiler water, and the output after comprehensive processing by the microcomputer, the amount of the phosphate pump is controlled to achieve the purpose of automatic dosing.
2. Feedwater and condensate ammonia adding system:
In addition to manual preparation, the preparation of ammonia liquid can also be automatically controlled: when the liquid level of the solution tank is lower than the set value, the solenoid valve of the condensed water inlet is automatically opened to the high liquid level and closed, and the conductivity meter installed on the outlet pipeline of the solution tank When the concentration is ±1, which is equivalent to a conductivity value of 450 us/cm, the ammonia inlet valve is automatically closed to complete the dispensing process.
In addition to manual control, the control of ammonia addition amount can also be automatically controlled: according to the sampling signal of the conductivity (or PH value) of the feed water, and the output after comprehensive processing by the microcomputer, the ammonia addition amount of the ammonia addition pump is controlled to reach the automatic dosing level. Purpose.
3. Boiler water phosphate coordination control system:
In large-capacity drum boilers with demineralized water as the make-up water, even if the boiler water maintains a suitable pH value, it prevents the generation of free NaOH and has both anti-corrosion and anti-scaling functions. This is the purpose of the coordinated treatment of boiler water phosphate. , Under the premise of ensuring that the boiler water PH and PO3- meet the ministerial standards, the water quality condition that the boiler water has no free NaOH is achieved by adding a mixture of Na3PO4+Na2HPO4 or Na3PO4+NaOH to the steam drum. Two formulas The choice of the boiler water is mainly determined by the water quality of the boiler, and the quantification of the formula - that is, the Na/PO4 ratio (R-value) is obtained by measuring PH and PO3- and looking up the table.
