CN-224220827-U - Back flushing device applied to water-coal-slurry gasification clarifying tank

CN224220827UCN 224220827 UCN224220827 UCN 224220827UCN-224220827-U

Abstract

The utility model relates to the technical field of water-coal-slurry gasification clarifying tanks, in particular to a back flushing device applied to a water-coal-slurry gasification clarifying tank, which comprises a first vacuum flash tank, a clarifying tank, a first static mixer and a first substrate pump, A first treatment pipeline is fixedly communicated between the bottom outlet of the first vacuum flash tank and the inlet of the first static mixer, and a first dosing pipeline is fixedly communicated with the inlet of the first static mixer. The utility model has reasonable and compact structure and convenient use, innovatively adds the first backwashing pipeline, the second backwashing pipeline and the flushing device, and when the bottom of the clarifying tank is blocked, more slurry or the electric raking machine cannot normally operate due to faults, the cleaner ash water collected by the overflow weir is adopted for backwashing, and the ash water collected in the overflow weir passes through the first backwashing pipeline, the fourth processing pipeline, the second backwashing pipeline and the flushing device to carry out backwashing on the blocked position of the bottom of the clarifying tank, thereby avoiding the influence of sediment accumulation on the normal and stable operation of the device.

Inventors

WEI JING
YAO SHUGUANG
TANG XIANWEI
LI JUNGUO
RU XIANGHUI
WANG JINJIAN
LI SHAOJUN

Assignees

新疆心连心能源化工有限公司

Dates

Publication Date: 20260512
Application Date: 20250605

Claims (8)

1. The back flushing device for the water-coal-slurry gasification clarifying tank is characterized by comprising a first vacuum flash tank, a clarifying tank, a first static mixer and a first substrate pump, wherein a first treatment pipeline is fixedly communicated between an outlet at the bottom of the first vacuum flash tank and an inlet of the first static mixer, a first dosing pipeline is fixedly communicated between an inlet of the first static mixer, a second treatment pipeline is fixedly communicated between an outlet of the first static mixer and an inlet at the top of the clarifying tank, a third treatment pipeline is fixedly communicated between a first outlet at the left side of the bottom of the clarifying tank and an inlet of the first substrate pump, a fourth treatment pipeline is fixedly communicated with an outlet of the first substrate pump, a steady flow tube is arranged at the inner side of the upper part of the clarifying tank, an overflow weir is fixedly arranged at the side wall of the upper part of the clarifying tank corresponding to the overflow weir position, a first chemical feeding pipeline is fixedly communicated between the outer side of the upper part of the clarifying tank and the third treatment pipeline, an electric rake is arranged at the lower side of the inner part of the clarifying tank, a second back flushing device is fixedly communicated with the fourth treatment pipeline, a second back flushing device is fixedly communicated with the second back flushing device is arranged at the outer side of the clear water flushing device, and the second flushing device is arranged at the outer side of the clear water device.
2. The back flushing device for the water-coal-slurry gasification clarifying tank as set forth in claim 1, wherein the flushing device comprises a ring main pipe and flushing branch pipes, the water outlet end of the second back flushing pipeline is fixedly communicated with the ring main pipe positioned outside the lower part of the clarifying tank, a plurality of flushing holes are circumferentially arranged on the inner side of the ring main pipe at intervals, each flushing hole is fixedly communicated with the flushing branch pipe between the corresponding positions of the lower part of the clarifying tank, and a valve is arranged on each flushing branch pipe.
3. The back flushing device for the water-coal-slurry gasification clarifying tank according to claim 1 or 2, wherein the overflow weir comprises an annular plate and an overflow cylinder, the annular plate is fixedly arranged on the side wall of the upper part of the clarifying tank, the overflow cylinder is fixedly arranged on the inner side of the annular plate, or/and the back flushing device further comprises a second vacuum flash tank and a second static mixer, a fifth treatment pipeline is fixedly communicated between the outlet of the bottom of the second vacuum flash tank and the inlet of the second static mixer, a second dosing pipeline is fixedly communicated with the inlet of the second static mixer, a sixth treatment pipeline is fixedly communicated between the outlet of the second static mixer and the inlet of the upper part of the clarifying tank, and the water outlet end of the sixth treatment pipeline extends to the inner side of the steady flow cylinder.
4. The back flushing device for the water-coal-slurry gasification clarifying tank according to claim 1 or 2, further comprising a second substrate pump, wherein a seventh treatment pipeline is fixedly communicated between a second outlet on the right side of the bottom of the clarifying tank and an inlet of the second substrate pump, and an eighth treatment pipeline is fixedly communicated between a fourth treatment pipeline on the right side of the second back flushing pipeline and an outlet of the second substrate pump.
5. The backwash device for a water-coal-slurry gasification clarifying tank according to claim 3, further comprising a second substrate pump, wherein a seventh treatment pipeline is fixedly communicated between a second outlet on the right side of the bottom of the clarifying tank and an inlet of the second substrate pump, and an eighth treatment pipeline is fixedly communicated between a fourth treatment pipeline on the right side of the second backwash pipeline and an outlet of the second substrate pump.
6. The back flushing device for water-coal slurry gasifying and clarifying tank as set forth in claim 1, 2 or 5, wherein the upper inlet of the clarifying tank is further connected with external waste water pipeline, the water outlet end of the external waste water pipeline extends to the inner side of the steady flow cylinder, and the bottom outlet of the clarifying tank is connected with waste liquid draining pipeline.
7. The back flushing device for water-coal slurry gasifying and clarifying tank as set forth in claim 3, wherein the upper inlet of the clarifying tank is further connected with external waste water pipeline, the water outlet end of the external waste water pipeline extends to the inner side of the steady flow cylinder, and the bottom outlet of the clarifying tank is connected with waste liquid draining pipeline.
8. The back flushing device for the water-coal-slurry gasifying and clarifying tank as set forth in claim 4, wherein the upper inlet of the clarifying tank is further connected with an external waste water pipeline, the water outlet end of the external waste water pipeline extends to the inner side of the steady flow cylinder, and the bottom outlet of the clarifying tank is connected with a waste liquid emptying pipeline.

Description

Back flushing device applied to water-coal-slurry gasification clarifying tank Technical Field The utility model relates to the technical field of water-coal-slurry gasification clarifying tanks, in particular to a back flushing device applied to a water-coal-slurry gasification clarifying tank. Background The slag water treatment device of the coal water slurry gasification system mainly comprises a gasification furnace, a cyclone separator and black water containing coal ash slag at the bottom of a water washing tower, wherein the black water and a flocculating agent are mixed in a first static mixer and then enter a clarifying tank after three-stage flash evaporation concentration. The flocculant is added in the clarifying tank to strengthen the sedimentation speed of solid particles in the concentrated black water. The settled mud is pumped into a filter press through a clarifying tank bottom material pump to carry out solid-liquid separation, a filter cake is transported out of the boundary, and the clarified filtrate at the upper part of the clarifying tank automatically flows into an ash water tank. An electric raking machine running at low speed is arranged in the clarifying tank, and the settled slurry is pushed into a slurry outlet at the center of the bottom of the clarifying tank along the bottom cone of the clarifying tank. The existing slag water device of the coal water slurry gasification system has the defects that (1) the slag water device comprises two sets of flash tanks, one flash tank is opened and the other flash tank is prepared, only one clarifying tank and an electric raking machine are arranged, and no backup measures exist after the electric raking machine fails. If the electric raking machine is blocked at the bottom of the clarifying tank and fails, mud cannot be discharged in time, and can only be accumulated at the bottom of the clarifying tank continuously, so that black water has no sedimentation space, the quality of grey water at the upper part of the clarifying tank is poor, the device cannot normally run, and the whole system can not be stopped, thus causing economic loss, (2) no flushing water system, if flushing is needed, fire-collecting water is required to be flushed through an observation port at the upper part of the clarifying tank, not only fresh water is wasted, but also flushing effect is poor, and (3) if the electric raking machine fails, maintenance is needed, the mud must be manually fed, the electric raking machine can be maintained after the inside of the clarifying tank is cleaned, and labor intensity of personnel is high. Disclosure of Invention The utility model provides a backwashing device applied to a coal water slurry gasification clarifying tank, which overcomes the defects of the prior art, and can effectively solve the problems that the bottom of the clarifying tank is blocked, slurry is accumulated, mud cannot be discharged and the quality of grey water is poor and the device cannot normally operate due to the failure of an electric raking machine in the existing slag water device. The technical scheme is that the backwashing device for the coal water slurry gasification clarifying tank comprises a first vacuum flash tank, a clarifying tank, a first static mixer and a first substrate pump, wherein a first treatment pipeline is fixedly communicated between the outlet of the bottom of the first vacuum flash tank and the inlet of the first static mixer, a first dosing pipeline is fixedly communicated with the inlet of the first static mixer, a second treatment pipeline is fixedly communicated between the outlet of the first static mixer and the inlet of the top of the clarifying tank, a third treatment pipeline is fixedly communicated between the first outlet on the left side of the bottom of the clarifying tank and the inlet of the first substrate pump, a fourth treatment pipeline is fixedly communicated with the outlet of the first substrate pump, a steady flow cylinder is arranged on the inner side of the upper part of the clarifying tank, an overflow weir is fixedly arranged on the outer side of the upper part of the clarifying tank corresponding to the overflow weir, a first backwashing pipeline is fixedly communicated between the outer side of the upper part of the clarifying tank corresponding to the overflow weir position and the third treatment pipeline, an electric rake is arranged on the inner lower side of the clarifying tank, a second treatment pipeline is fixedly communicated with the upper end of the second treatment pipeline, and the second backwashing device is fixedly arranged on the outer side of the upper side of the clarifying tank. The following are further optimizations and/or improvements to the above-described inventive solution: The flushing device comprises an annular main pipe and flushing branch pipes, wherein the water outlet end of the second back flushing pipeline is fixedly communicated with the annular main pipe