Project address: Xuzhou

Project address: Xi'an, Shaanxi
Equipment model: DHS 80-1.6/260-Q

Project address: Shanxi Yuncheng/Inner Mongolia
Equipment model: SFG-55-3.82-MX/QXX70-1.6/150/90-H

Equipment model: SFG-20/5.3-MS

In order to ensure the reliability of each part of the furnace wall of the boiler and long-term use at different temperatures, gradually evaporate the water, and ensure the strength and airtightness of the furnace wall, the newly installed boiler and the newly built furnace wall are naturally cured. , the oven must be carried out.The oven process is actually two stages, namely the natural drying stage during construction and the heating and baking stage.

1. The boiler body is installed, the furnace wall and insulation work are completed, and the natural maintenance is 5-7 days; 2. The trial operation of each boiler system is completed; 3. The thermal instruments and measuring points required for the oven have been installed and calibrated; 4. Prepare enough fuel for the oven (such as firewood, bottom material, carbon block); 5. Contact the steam turbine personnel to fill the boiler with water to ensure that the water level is at the normal water level.6. After inspection by the testing department, the hydraulic test is qualified.

1. Turn on the induced draft fan to discharge the gas from the furnace; spread the prepared firewood and base material, with a thickness of about 250 mm, and then ignite it with a torch. At the beginning, the ventilation volume should be small, and the fire should be carried out according to the requirements of the heating curve. Turn on the induced draft fan to make the flue gas flow slowly, increase the rotational speed of the induced draft fan in the middle and late stages, and heat up according to the oven curve.2. Oven standard: based on the moisture content of the brick wall.When the refractory brick mortar moisture content of the furnace wall reaches about 7%, and the red brick mortar reaches 7-10%, it is possible to start the furnace without baking the furnace separately. After the furnace is finished, the moisture content of the furnace wall mortar is below 2.5%. Oven finished.

1. Oven time and temperature control points are different due to different refractory materials and metal heating surface materials. It should be carried out in strict accordance with the heating curve of the oven. The temperature should be raised slowly, and the flame distribution should be uniform.For example, the oven temperature of high-strength wear-resistant castables in a circulating fluidized bed boiler can be referred to as follows: temperature range (℃) rise (decrease) temperature speed (℃/h) required time (h) normal temperature ~ 1505 ~ 1013 ~ 26150± 5024150～31510～1511～16.5315±5036315～54020～257.5～9540±5024540－Normal temperature<25/2. During the oven, the boiler water level should be kept normal, and the expansion of the boiler drum and each header should be monitored and recorded.

In the process of boiler water level control, the adjustment method in which the drum water level is used as the feedback signal is called the single-impulse adjustment of the boiler water level.Single-impulse water level control is the simplest and most basic form of automatic control of boiler drum water level.The three-impulse water level adjustment is in the process of automatic water level control, according to the three impulses of the drum water level, feed water flow, and steam flow through PID calculation to adjust the opening of the feed water valve, so as to achieve the purpose of automatic control of the feed water flow.Three-impulse regulation is actually a cascade control system with a feedforward signal.The liquid level controller and the flow controller constitute a cascade control system.Drum level is the primary variable and feed water flow is the secondary variable.The introduction of secondary variables enables the system to have a strong ability to overcome fluctuations in feedwater pressure (flow).The signal of the steam flow is introduced as a feedforward signal.Because the fluctuation of the steam flow is a factor that causes the change of the liquid level in the steam drum, it is a disturbance effect. When the steam flow fluctuates, it is introduced by measuring

The single-impulse water level automatic adjustment system is the simplest adjustment method. It adjusts the opening of the feed water control valve according to the water level deviation of the steam drum.The advantage is that the adjustment is simple, and only one water level signal is used as the adjustment amount.The main disadvantage of the single-impulse water level adjustment method is that when the evaporation or steam pressure changes suddenly, the steam content in the boiler water will change rapidly, resulting in a false water level in the boiler drum, resulting in misadjustment of the feed water control valve.Therefore, single-impulse regulation is generally used for small-capacity boilers with relatively stable loads.The three-impulse water level automatic adjustment system is a relatively complete adjustment method. In addition to the drum water level signal, the system also includes steam flow and feed water flow.The water level of the steam drum is the main signal; the steam flow rate is the feedforward signal. Due to the existence of the feedforward signal, it can effectively prevent the malfunction of the regulator caused by "false water level", and improve the adjustment quality under the disturbance of evaporation or steam pressure. ; The feed water flow signal is the feedback signal of the medium, which can overcome the feed water