HDD mud recycling system
Drilling mud for trenchless engineering, the mud pumped from the working machine (or sedimentation tank) (1) by the mud pump passes through the mud logging tank
(2) of the shale shaker and enters the bottom layer of the shale shaker
(3) of the mud recovery system. The coarse particles in the sludge are screened out, and then enter the slurry storage tank
(4), and are sucked from the tank by the sand pump
(5), and the slurry with a certain kinetic energy is removed from the desander
(6) along the pipeline. The slurry inlet is tangentially injected, and the silt with fine particle size is discharged from the drip nozzle at the lower end by the cyclone and falls onto the upper fine screen of the shale shaker (3). After being dewatered and screened by the fine sieve, the drier fine slag is separated, and the mud passing through the fine sieve is returned to the slurry tank (4). The clean slurry processed by the cyclone (6) enters the middle storage tank
(7) from the overflow pipe of the cyclone, and then is transported out along the slurry outlet pipe or returns to the slurry storage tank (4).
During the mud circulation process, a liquid level buoy
(8) between the middle storage tank and the slurry storage tank keeps the liquid level in the slurry storage tank constant. Once the amount of slurry output in the slurry tank is greater than the supply, the liquid level float will fall with the drop of the liquid level, and the slurry in the middle tank will be transferred to the slurry tank through the opened slurry replenishing pipe, and the liquid level will therefore It rises and returns to its original state; if the slurry supply is greater than the output, the slurry tank will overflow to prevent slurry flooding. When higher quality mud is required, the mud sorting process in the cyclone can be repeated by reducing the total feed amount.