Comparator circuit identification
This simulation should give you a clue as to the circuit operation.





I changed the capacitor value so the simulation time was reasonable. As you can see it makes the opamp output a positive direction pulse when the input signal changes level by a certain amount. With the component values shown this will detect a change of the input signal as low as about 20mV.

The R7 and R8 resistors assure that there is some voltage differential between the opamp inputs when the circuit has a steady state input. The resistor values also affect the timing.