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FAQ

Hi, I wonder if anybody could help me please, My Worcester 28 SI II will cut out after filling half a bath, then the red light flashes, after resetting it just trips again straight away and again and again.Same happens with central heating, it will run for 20 mins then cut out and wont reset.However here is the weird bit, if I then leave it for 40 mins or so to cool down it will again fill half a bath or will heat house for 20 mins.Its 9 years old and had a new pcb 6 years ago, this does sound to me like a dry joint again on the pcb or even a diode or capacitor that expands when the pcb gets hot. But im not the expert you are. I don’t want to replace the pcb and find out its just the same. Any ideas please??Thanks all in advance.

Worcester Si Boiler

What happens when the steam boiler is full of water

If the water level exceeds the upper visible level of the water level table, when the drain plug is opened, the water level drops when the water level is not visible.

My boiler is about 7 years old, so not too old. But a few times in the last year, we've had to call out a plumber because the water pressure keeps dropping and it trips something inside. We have to top it up every 3 weeks or so - is that normal??? And what could be causing it? There's no noticeable sign of a leak anywhere. Is a leak the only reason the pressure could be dropping so quickly?Thanks!

The expansion tank has a bladder inside that compensates for the changes you speak of. It may need replacement if the bladder is losing air. Have your service tech check it next time.

it is used in power generation plant

In a conventional boiler, water is heated in the furnace area and then rises up to the boiler drum where the steam separates and passes to the superheater stages. Any remaining water returns to the furnace tubes. It is the difference in the steam/water density that causes circulation. In a supercritical boiler (above 3,200 psi or 221 bar pressure) there is no difference in steam/water density so circulation is provided by pumps. The steam/water change occurs in the furnace tubes eliminating the need for a boiler drum. Advantages are higher efficiency and quicker start up times. Boiler drums are very thick and have to be heated and cooled relatively slowly to prevent stress damage. Forgot to mention that, in a supercritical boiler, the evaporation takes place in the tubes thus the water only flows through once - a once through boiler. In a drum type boiler, any water in the steam/water mix is recycled, thus passing through more than once.

I recently move and my new apartment have center boiler heater. And I have put them next to the heater. So, I was just wondering is it ok for my birds or not.Also, there are acting well eating drinking and playing..

I wouldn't put them right next to the boiler/heater... it'll tend to dry out their feathers and skin... You actually might want to look into getting some sort of humidifier to go near your bird's cage... birds need moisture in the air to remain healthy.

A steam power plant operating in an ideal Rankine cycle has a high pressure of 5MPaand a low pressure of 15 kPa. The turbine exhaust state should have a quality of at least95% and the turbine power generated should be 7.5MW. Find the necessary boiler exittemperature and the total mass flow rate

Below I write you a code for the software EES (Engineering Equation Solver). Download and install the trial version of said software if you don't have it already. !----Begin EES--------- {Unit settings: be sure to set it up as: kJ; mass basis; kg; C; kPa} State labeling: State 1: pump inlet, condenser outlet State 2: boiler inlet, pump outlet State 3: turbine inlet, boiler outlet State 4: condenser inlet, turbine outlet Data W_dot_out = 7500 [kW] P[1] = 15 [kPa] P[3] = 5000 [kPa] x[4] = 0.95 Assumptions: 1. turbine and pump are both adiabatic and isentropic 2. pressure variation across all heat exchangers and piping is negligible 3. all velocity effects are negligible 4. saturated liquid enters the pump (no subcooling) x[1] = 0 Strategy: Equate pressures across heat exchangers P[1] = P[4] P[2] = P[3] Trivial entropy and enthalpy h[1] = enthalpy(Steam, P=P[1], x=x[1]) s[1] = entropy(Steam, P=P[1], x=x[1]) h[4] = enthalpy(Steam, P=P[4], x=x[4]) s[4] = entropy(Steam, P=P[4], x=x[4]) Equate entropy across pump and turbine s[1] = s[2] s[3] = s[4] Complete the table h[2] = enthalpy(Steam, P=P[2], s=s[2]) h[3] = enthalpy(Steam, P=P[3], s=s[3]) T[1] = Temperature(Steam, P=P[1], s=s[1]) T[2] = Temperature(Steam, P=P[2], s=s[2]) T[3] = Temperature(Steam, P=P[3], s=s[3]) T[4] = Temperature(Steam, P=P[4], s=s[4]) Energy balance equations W_dot_out = m_dot*(h[3] - h[4]) W_dot_in = m_dot*(h[2] - h[1]) W_dot_net = W_dot_out - W_dot_in Q_dot_in = m_dot*(h[3] - h[2]) Q_dot_out = m_dot*(h[4] - h[1]) eta = W_dot_net/Q_dot_in !----End EES---------

The classification of the boiler is classified by device

Boiler is an energy conversion device, the input energy to the boiler fuel in the chemical energy, power, boiler output with a certain heat of steam, high temperature water or organic heat carrier.

What is the full name of the CFB boiler?

, Cogeneration, power plant boilers are widely used.