CN110652757B

CN110652757B - Method and device for pumping high-concentration bottom mud of mud scraper of sedimentation tank at constant torque

Info

Publication number: CN110652757B
Application number: CN201911058978.2A
Authority: CN
Inventors: 张凯茵
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2021-10-08
Anticipated expiration: 2039-11-01
Also published as: CN110652757A

Abstract

A method and a device for pumping high-concentration bottom mud of a mud scraper of a sedimentation tank with constant torque are used for reading the numerical value of the mud scraping reaction force of the mud scraper and dividing a mud pumping program into a plurality of steps according to the numerical value, so that the concentration of the mud pumped by the mud scraper is highest, the dehydration operation of subsequent dehydration facilities of the sedimentation tank is facilitated stably, and the mud scraping operation torque force of the mud scraper can be kept in a safe range with the highest appropriate rate.

Description

Method and device for pumping high-concentration bottom mud of mud scraper of sedimentation tank at constant torque

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a method and a device for pumping high-concentration bottom mud with constant torque of a mud scraper of a sedimentation tank.

Background

The suspended particles contained in the wastewater produced in the factory production process need to be precipitated and separated before being discharged, so that the suspended particles are removed from the wastewater, and the wastewater can be discharged only after becoming clear liquid. The wastewater treatment process performs this function as a coagulation and sedimentation process and is carried out in a coagulation tank and a sedimentation tank.

As shown in figure 1, in the conventional coagulating sedimentation operation, raw water 1 and coagulating liquid 2 are injected into a coagulating basin 3 to forcibly stir water flow by an in-tank stirrer 4, so that the raw water and the coagulating liquid are fully stirred and mixed, suspended particles which are not easy to settle and separate in wastewater are flocculated into coagulated sludge 5 which is easy to settle and separate, the stirred coagulated sludge 5 is injected into a settling basin 7, the coagulated sludge 5 sinks into the bottom of the settling basin and is scraped to a sludge collecting chamber 17 in the center of the settling basin by a sludge scraper 10 by virtue of hydraulic retention time provided by the settling basin 7, and the concentrated bottom sludge is pumped out by a bottom sludge pipe 18 at the bottom of the settling basin by a sludge pumping pump 19 connected with the bottom sludge pipe and is discharged to a sludge dewatering facility. The existing mud pumping facility of the mud scraper mainly has the following problems: the mud pumping pump 19 is controlled to pump mud regularly by setting time by a timer, the mud pumping time is not matched with the condition of the bottom mud, the concentration of the pumped bottom mud is often insufficient or uneven, the dewatering time of subsequent dewatering facilities such as a filter-press type dewatering system is prolonged greatly due to low concentration, and the medicament is mixed and condensed into poor-efficiency mud in the case of a filter belt type mud dewatering system, so that the dewatering operation is not performed; if the concentration of the inflow raw water 1 is in a changing state, a regular bottom mud pumping procedure is adopted, except that the concentration of the pumped sludge is uneven, if the bottom mud is a material with high specific gravity, the bottom mud is deposited for a long time and has poor liquidity, and the phenomenon of pipe blockage is often caused if the bottom mud is accumulated too much and then the sludge is pumped. The existing sedimentation tank bottom mud pumping method adopts a timing mud pumping method, so that the bottom mud cannot be pumped according to the bottom mud amount of the sedimentation tank, the concentration of the pumped bottom mud is uneven, the situation that a bottom mud pipe is blocked is easy to occur, the operation of a subsequent dewatering facility is not facilitated, and the situation that the sediment sludge discharge operation is blocked is not a proper treatment facility.

Therefore, there is a need in the art for a new solution to the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a method and a device for pumping high-concentration bottom mud of a mud scraper of a sedimentation tank at a constant torque, which solve the problems of the existing mud pumping facilities of the mud scraper in the background art.

The technical scheme of the invention is as follows:

a high-concentration bottom mud constant-torque mud pumping method of a mud scraper of a sedimentation tank determines the mud pumping time and the mud pumping procedure of a mud discharge pump according to the operation reaction generated by scraping the bottom mud by a scraping arm group of the sedimentation tank, and the method comprises the following steps:

an intermittent mud pumping step, wherein raw water is injected into an operation torsion generated by scraping bottom mud of a mud scraper of a sedimentation tank and is increased to a set intermittent mud pumping torsion, a mud pumping pump starts pumping mud within a rated time, the mud pumping time reaches the rated value, then the mud pumping pump is closed to stop pumping mud within the rated time, mud pumping and stopping mud pumping are alternately operated until an operation reaction force is reduced to the set intermittent mud breaking torsion, the mud pumping pump stops operating, the operation reaction force of mud scraping of a scraping arm group is increased to the intermittent mud pumping torsion and then enters an intermittent mud pumping program, and the concentration of the pumped bottom mud achieves the purpose of stability;

a continuous mud pumping step, when the mud scraping operation reaction force of the mud scraper arm group rises to reach the set continuous mud pumping torsion, the mud discharging pump continuously pumps bottom mud to ensure that the mud scraping operation reaction force of the mud scraper arm group (9) is reduced to the intermittent mud pumping torsion, the mud discharging pump stops the continuous mud pumping step and then enters the intermittent mud pumping step;

a pipe washing and plug discharging program, when the continuous mud pumping rated time operation torque force is still continuously surpassed the continuous mud pumping torque force to reach the pipe washing and plug discharging torque force, the injection of raw water into the sedimentation tank is stopped to carry out the sedimentation operation of coagulating mud, the reaction force of mud scraping operation is stopped to rise again, then the bottom mud is blocked from flowing into the mud discharging pump, the clear water above the sedimentation tank is led into the mud discharging pump, is pressurized and flushed into the mud discharging bottom pipe through the mud discharging pump to flush out the blockage, and then enters the continuous mud pumping step;

a mud lifting and pumping step, if the torque rises sharply in the operation process of the mud scraper and exceeds the torque of the washing pipe plug and rises rapidly to the mud lifting and pumping torque, which may damage the transmission speed reducer, the mud scraping arm group needs to rise urgently, the mud pumping and pumping operation is continued in the rising process of the mud scraping arm group, when the mud scraping operation reaction force falls to be equal to the intermittent mud pumping torque force in the rising process of the mud scraping arm group, the mud scraping arm group stops rising, the mud pumping and pumping operation enters an intermittent mud pumping procedure, when the mud scraping operation reaction force falls to be equal to the intermittent mud breaking torque force, the mud pumping and pumping pump stops pumping mud, the mud scraping arm group starts to fall until the mud scraping operation reaction force is equal to the intermittent mud pumping torque force, the intermittent mud pumping procedure is continued, the intermittent mud pumping procedure is repeated in such a way until the mud scraping arm group falls to a rated lower limit position, the rated mud pumping procedure is recovered, the starting time of each mud pumping step depends on the actual value of the mud scraping operation reaction force of the mud scraper, which corresponding mud pumping step is implemented as the mud pumping operation at the start.

Furthermore, when the step of washing the pipe and discharging the blockage is carried out, a mud blocking valve of the mud discharging bottom pipe and a mud discharging valve on the mud discharging pipe are locked to prevent the bottom mud from flowing into the mud discharging pump, a clean water valve on the clean water pipe and a mud washing valve on the mud washing pipe are opened, so that the clean water above the sedimentation tank flows into the mud discharging pump along with the clean water pipe, is flushed into the mud discharging bottom pipe by the pressurized mud washing pipe to flush the blockage in the pipe, then all the control valves are switched to return to the original position, and the locked clean water flows into the mud discharging pump to guide the bottom mud to flow into the mud discharging pump and then enters the bottom mud pumping operation.

A wash pipe anti-clogging pipeline device of a sludge discharge bottom pipe of a sedimentation tank mud scraper comprises a clean water guide pipeline, wherein a sludge blocking valve is arranged on the sludge discharge bottom pipe at the bottom of a sedimentation tank barrel groove and an external connecting pipe of a sludge discharge pump pond, the sludge discharge bottom pipe between the sludge discharge pump and the sludge blocking valve is connected with a clean water pipe to the upper part of the barrel groove, and a clean water valve is arranged on the clean water pipe to control the inlet end of the clean water to enter and exit the sludge discharge pump so as to guide the clean water to flow into the sludge discharge pump;

the mud washing pipeline is characterized in that a mud discharging pipe at the outlet end of the mud discharging pump is provided with a mud discharging valve for blocking the mud discharged by the mud discharging pump from flowing out of the sedimentation tank, the mud discharging pipe between the mud discharging valve and the mud discharging pump is provided with a mud washing pipe connected to a mud discharging bottom pipe, and the pipeline joint is positioned on the mud discharging bottom pipe between the mud discharging valve and the sedimentation tank and used for guiding clear water above the sedimentation tank to wash into the mud discharging bottom pipe along with the mud washing pipe to clear away blocked mud clusters.

The invention adopting the technical scheme can bring the following beneficial effects:

the concentration of the bottom mud pumped out by the sedimentation tank is high and stable, the subsequent dehydration facility is facilitated, and the energy is saved and the stability is high.

And (II) the sludge pumping amount of the sedimentation tank can automatically change a sludge pumping mode according to the concentration of the sludge in the raw water, so that the running reaction force of the sludge scraper can be kept running in a safe range.

And thirdly, a mud discharging bottom pipe washing program is provided, when the mud discharging bottom pipe is blocked, clear water in the tank can be extracted to wash the blocked pipeline, and no extra washing water source or pump is needed, so that the mud discharging pipeline can be ensured to be smooth to pump and remove the bottom mud in the sedimentation tank.

Drawings

FIG. 1 is a schematic view showing the operation of a mud scraper of a sedimentation tank for feeding water and pumping bottom mud;

FIG. 2 is a schematic view showing the sludge scraping state of the scraping arms and the stress state of the sediment in the constant torque mud pumping method for the high-concentration sediment of the sedimentation tank mud scraper of the present invention;

FIG. 3 is a schematic view of the sludge discharge state of a sludge discharge bottom pipe of the high-concentration bottom sludge constant-torque sludge pumping method of the sedimentation tank mud scraper of the invention;

fig. 4 is a schematic view showing the pipe washing state of the sludge discharge bottom pipe of the high-concentration bottom sludge constant-torque sludge pumping method of the sedimentation tank mud scraper.

In the figure, 1-raw water, 2-coagulation medicament, 3-coagulation tank, 4-mixer, 5-coagulation sludge, 6-rectifying cylinder, 7-sedimentation cylinder, 8-sedimentation tank bottom, 9-scraping arm group, 10-scraping arm, 11-scraping plate, 12-overflow weir, 13-clarified liquid, 14-drainage port, 15-transmission reducer, 16-transmission shaft, 17-sludge collection chamber, 18-sludge discharge bottom pipe, 19-sludge pump, 20-bottom sludge, 21-settled sludge, 22-recovered water, 23-bridge, 24-scraping plate normal line mud pushing force, 25-scraping plate mud pushing component force, 26-scraping plate centripetal mud pushing component force, 27-pulling force in pulling member, 28-pulling member axial shearing force, 29-pulling member radial pulling force, 30-the operation direction of the scraping arm, 31-the sludge discharge pipe, 32-the sludge washing pipe, 33-the clean water pipe, 34-the sludge discharge valve, 35-the clean water valve, 36-the sludge washing valve and 37-the sludge blocking valve.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description;

as shown in fig. 2, when the mud scraper of the sedimentation tank scrapes mud, the mud in the sedimentation tank is pushed toward the center of the circle by the pushing force of the scraper 11, and the mud is also moved toward the center of the tank by gravity along the inclined surface inclined toward the center of the tank bottom. The scraping plate 11 is welded on the scraping arm 10 and inclines a certain angle with the axial lead of the scraping arm 10, so that the normal line of the tangent line of the outer diameter of the arc line of the scraping plate 11 generates a centripetal thrust 26 facing the center of the tank, the centripetal thrust 26 is enough to scrape the sludge to the sludge collection chamber 17 at the center of the circle of the sedimentation tank, and then the sludge pump 19 is used for pumping the bottom sludge in the sludge collection chamber 17 to finish the sludge scraping operation of the sludge scraper. The mud scraper drives the scraping arm group 9 to rotate to carry out mud scraping operation, the scraping arm 11 pushes the bottom mud to displace, the sliding resistance of the bottom mud reversely presses the scraping arm to generate operation reaction force, the operation reaction force is equal to the operation torque of a transmission speed reducer 15 of the mud scraper, the reaction force is in direct proportion to the deposition concentration and the deposition amount of the bottom mud, and the operation reaction force generated by the scraping operation of the scraping arm group 9 can be used as a signal for controlling the bottom mud pumping operation; if the concentration of the extracted bottom mud is uniform, the operation reaction is set to be a fixed value, then the mud pumping pump 19 is started to pump the bottom mud, and when the operation reaction force is lower than a torsion set value, the mud pumping pump 19 is stopped to operate, so that the concentration of the extracted bottom mud 20 tends to be stable. When the mud scraper carries out mud scraping operation, the mud scraping plates 11 at the periphery of the scraping arm group 9 can scrape the mud in a swept area to the next scraping plate 11 at the inner periphery every time the mud scraping plates 11 rotate for one circle, so the mud at the periphery can be scraped into the mud collecting chamber 17 at the center of the pool only after the scraping arm group 9 rotates for a plurality of circles, the mud resistance of the mud scraping plates 11 at the periphery is reduced obviously due to the long arm length when the mud scraping operation of the scraping arm group is carried out, even if the mud in the mud collecting tank 17 in the middle is removed, the mud is not uniform in concentration or too low in concentration because the moment arm of force of the scraping arms 10 at the periphery of the mud collecting chamber 17 is short, the running reaction force of the scraping arms is reduced still obviously, if the mud pumping time is too long, the mud is possibly pumped into the water body above the mud collecting tank 17 in the settling tank, so that the pumped mud is not uniform in concentration or too low in concentration, therefore, the mud pumping frequency can be changed into an intermittent mud pumping mode, the mud pumping operation is started within a set torque range, the mud pumping operation is stopped for a period, and the operation reaction force generated by the mud scraping operation is repeated so as to control the mud pumping operation signal of the mud scraping operation, the concentration of the extracted bottom mud 20 is stabilized.

As shown in figure 1, raw water 1 flows into a sedimentation tank for sedimentation operation, coagulated sludge 5 in the raw water 1 sinks to the bottom of the tank and is scraped into a sludge collection chamber 17 by a scraper 11 of a scraper arm group 9 for accumulation, and as the sedimentation operation is carried out, the sludge scraped by the scraper 11 is accumulated in the sludge collection tank 17, the sludge level is gradually increased to cover a bottom sludge discharge pipe opening and is isolated from clean water in the tank, an annular sludge blanket is formed at the center in the tank to cover a sludge collection area 17, and the sludge in the tank is accumulated in enough quantity to form enough sludge level height and then is pumped out of the sedimentation tank, so that the condition that the concentration of the sludge is reduced by pumping the clean water is avoided. The proportion of collection mud pond 17 top clear water is far less than the bed mud, consequently its mobility of low viscosity is greater than the bed mud, if the bed mud layer thickness is not enough, the clear water will be because of the 19 suction of row's mud pumping flow with higher speed of the clear water of row's mud pumping during the pumping operation and pass through the bed mud layer, and the mud concentration that row's mud pumping 19 will lead to taking out reduces with the synchronous inflow of bed mud, and consequently the bed mud need accumulate enough high mud level of accumulation above the collection mud district 17 and arrange mud again, just can reduce the clear water and take place along with the synchronous exhaust situation of bed mud. The concentration of the bottom mud in the sedimentation tank is in direct proportion to the sedimentation time and the height of the mud bed, the higher the accumulated height of the mud bed is, and the higher the mud concentration of the bottom layer is compacted due to gravity, the longer the sedimentation time is, the longer the gravity compaction action is, the higher the bottom mud concentration is relatively increased; the flow rate of the sludge discharge pump 19 at the bottom of the sedimentation tank needs to be larger than the sedimentation amount of the mixed and coagulated sludge 5 in unit time, otherwise, the sludge is accumulated in the sedimentation tank, and the sludge scraping reaction force of the sludge scraper is continuously increased; when the sludge at the bottom of the pool is accumulated to the rated concentration, the fluidity of the sludge is poor, if the phenomenon that the settled sludge is a material with high specific gravity is more obvious, the phenomenon that the bottom sludge discharge pipe 18 is not enough in fluidity and pipe blockage occurs is caused, so the flow speed of the sludge in the bottom sludge discharge pipe 17 needs to be improved, the bottom sludge is sucked to the sludge discharge pump 19 by virtue of the suction force of the sludge discharge pump 19, the suction force is in direct proportion to the discharge capacity of the sludge discharge pump, the larger the discharge capacity is, the stronger the pump suction force is, and the blockage probability of the bottom sludge discharge pipe 18 is effectively reduced; because the discharge capacity of the sludge pump 19 is larger than the production capacity of the original coagulation sludge sedimentation operation, if the sludge accumulated in the sludge collection area 17 of the sedimentation tank in the continuous sludge pumping mode is pumped out gradually, the sludge will be pumped out to the clear water above along with the lowering of the sludge level, therefore, the sludge pumping program is set as the intermittent sludge pumping mode, the sludge pumping program of the sludge pump 19 is the sludge pumping rated time, the sludge pumping rated time is stopped, the sludge pumping stopping program is periodically repeated, when the sludge scraper scraping arm group 9 scrapes the sludge to the sludge collection area 17, the operation reaction force of the sludge scraper will rise along with the accumulation of the sludge, when the sludge pump 19 pumps the sludge, the sludge level of the sludge collection area 17 is lowered, the sludge scraping operation reaction force is lowered along with the lowering, therefore, the operation torsion when the sludge taking level is the upper limit is the intermittent sludge pumping torsion, the operation reaction force which will not pump the lower limit of the clear water in the sedimentation tank is the intermittent sludge taking torsion, in the range of the operating torque force, the sediment is alternately pumped out. When the sludge concentration in the raw water is in a steep rise state, the sludge discharge pump 17 is used for regularly pumping sludge, the sludge discharge amount is lower than the sludge deposition amount, the deposited bottom sludge is gradually accumulated to enable the operation torque of the sludge scraper to synchronously rise, and if the raw water sludge is in a continuous state, when the operation torque of the sludge scraper reaches a rated value, which is called as continuous sludge pumping torque, the sludge discharge pump 19 adopts a continuous sludge pumping procedure to quickly pump the bottom sludge, so that the operation torque of the sludge scraper is reduced to the intermittent sludge pumping torque and then enters the intermittent sludge pumping procedure; when entering the continuous mud pumping program, the mud scraping operation reaction force of the mud discharging pump 19 continuously pumps mud for a rated time and still continuously rises to the washing pipe mud discharging torsion, which may be a situation that the mud discharging pipe 18 is blocked, and a pipeline is blocked by foreign matters or mud clusters with poor fluidity, so that the mud from the mud scraping machine cannot flow to the mud discharging pump 19 to be discharged from the sedimentation tank under pressure, the water inlet of the raw water 1 needs to be stopped immediately, so that the mud from the sedimentation tank does not enter the mud scraping machine to avoid the mud scraping operation reaction force from rising again, at the moment, the mud from the bottom is blocked from flowing into the mud discharging pump 19, the outlet end of the mud discharging pump 19 is locked, the mud discharging pump 19 pumps the clean water in the sedimentation tank to pressurize the mud discharging bottom pipe 18, and the clean water is injected into the mud discharging bottom pipe 18, because the mud bottom pipe 18 and the mud discharging pump 19 are blocked, so that the clean water can only flow to the mud collecting chamber 17 along the mud discharging bottom pipe 18, the pressurized clean water of the mud discharging pump 19 flushes the blocked mud clusters from the mud discharging bottom pipe 18 to the mud collecting chamber 17, after the sludge discharge channel is opened, a sludge discharge pump 19 continuously pumps sludge until the sludge scraping operation counteracts and reduces to the intermittent sludge pumping torsion, and then raw water (1) is injected for sedimentation operation of a sedimentation tank. If the torque rises to the mud lifting torque in the running process of the mud scraper and the transmission speed reducer is possibly damaged, the scraping arm group 9 needs to rise emergently, the mud pumping operation of the mud pump 19 is continued in the rising process of the scraping arm group 9, the scraping arm stops rising when the mud scraping torque drops to the intermittent mud pumping torque in the rising process of the scraping arm, an intermittent mud pumping program is started, when the mud scraping torque drops to the intermittent mud breaking torque, the scraping arm group 9 continuously drops to the mud scraping torque which is equal to the intermittent mud pumping torque, and then the intermittent mud pumping program is continuously executed, and the operation is repeated in such a way that the scraping arm group 9 drops to the rated lower limit position, and the step is called as the mud lifting pumping program.

As shown in fig. 3 and 4, a mud pipe dredging pipeline diagram of the sediment pipe for the sediment-scraping high-concentration sediment constant-torque mud pumping method of the sedimentation tank of the present invention is shown, which uses the water source of the sedimentation tank and the original mud pump 19 to dredge the blocked sediment pipe 18 without additional water source cleaning and dredging pump. The mud washing pipeline is configured as follows, a mud discharging bottom pipe 18 at the bottom of the cylinder groove and a mud discharging pump 19 are provided with a mud blocking valve 37 at a connecting pipe outside the pool, so that the bottom mud in the mud discharging bottom pipe 18 can be cut off to flow into the mud discharging pump 19, the mud discharging bottom pipe 18 between the mud discharging pump 19 and the mud blocking valve 37 is connected with a clear water pipe 33 to the upper part of the cylinder groove, and a clear water valve 35 is arranged on the clear water pipe 33 and can control clear water to flow in and out of the inlet end of the mud discharging pump 19 so as to guide the clear water to flow into the mud discharging pump 19; the sludge discharge pipe 31 at the outlet end of the sludge discharge pump 19 is provided with a sludge discharge valve 34 to block the sludge discharge pump 19 from drawing out the sludge and flowing out of the sedimentation tank, the sludge washing pipe 32 is arranged on the sludge discharge pipe 31 between the sludge discharge valve 34 and the sludge discharge pump 19 and connected to the sludge discharge bottom pipe 18, and the joint of the pipe is positioned on the sludge discharge bottom pipe 18 between the sludge stop valve 37 and the sedimentation tank to guide clear water above the sedimentation tank to wash into the sludge discharge bottom pipe 18 along with the sludge washing pipe 32 to remove the blocked sludge. When the sediment removal operation is carried out on the bottom of the sedimentation tank, a sediment blocking valve 37 on the sediment discharge bottom pipe 18 and a sediment discharge valve 34 on the sediment discharge pipe 31 are opened, a clean water valve 35 on the clean water pipe 33 and a sediment washing valve 36 on the sediment washing pipe 32 are closed, so that the bottom sediment of the sedimentation tank is pumped out by the sediment discharge pump 19 and then flows out of the sedimentation tank through the sediment discharge pipe 31 to be discharged to a final sludge dewatering facility; when the pipe washing and plugging operation of plugging the sludge discharge bottom pipe 18 is performed, the sludge blocking valve 37 of the sludge discharge bottom pipe 18 and the sludge discharge valve 34 on the sludge discharge pipe 31 are locked, the clean water valve 35 on the clean water pipe 33 and the sludge washing valve 36 on the sludge washing pipe 32 are opened, so that the clean water above the sedimentation tank flows into the sludge discharge pump 19 along the clean water pipe 33, is pressurized along with the sludge washing pipe 32, is flushed into the sludge discharge bottom pipe 18 to flush the blockage in the pipe, and then is switched to the valve position to return to the original position to enter the bottom sludge pumping operation.

The invention relates to a high-concentration bottom mud constant-torque mud pumping method of a sedimentation tank mud scraper, which determines the mud pumping time and the mud pumping procedure of a mud pump 19 according to the operation reaction generated by scraping the bottom mud by a sedimentation tank scraping arm group 9, and the method is divided into the following steps:

an intermittent sludge pumping step, injecting raw water 1 into a sedimentation tank, raising the operating torque generated by scraping bottom sludge by a sludge scraper to a set intermittent sludge pumping torque, starting a sludge pumping pump 19 for pumping sludge within a rated time, closing the sludge pumping pump 19 again when the sludge pumping time reaches, stopping pumping sludge within the rated time, alternately operating the sludge pumping pump and stopping pumping sludge until the operating reaction force is reduced to the set intermittent sludge breaking torque, stopping the operation of the sludge pumping pump 19, raising the operating reaction force of the sludge scraping of a scraping arm group 9 to the intermittent sludge pumping torque, and entering an intermittent sludge pumping program to stabilize the concentration of the pumped bottom sludge;

a continuous mud pumping step, when the mud scraping operation reaction force of the mud scraper arm group 9 rises to reach the set continuous mud pumping torsion, the mud discharging pump 19 continuously pumps bottom mud to ensure that the mud scraping operation reaction force of the mud scraper arm group is reduced to the intermittent mud pumping torsion, the mud discharging pump 19 stops the continuous mud pumping step, and then the intermittent mud pumping step is carried out;

a pipe washing and plug discharging program, when the continuous mud pumping rated time operation torque force is still continuously surpassed the continuous mud pumping torque force to reach the pipe washing and plug discharging torque force, the injection of raw water (1) into the sedimentation tank is stopped to carry out the sedimentation operation of the coagulated mud 5, the reaction force of the mud scraping operation is stopped to rise again, then the bottom mud is blocked from flowing into the mud discharging pump 19, the clear water above the sedimentation tank is led into the mud discharging pump 19 to be pressurized and flushed into the mud discharging bottom pipe 18 through the pressure of the clear water, and then the blockage is flushed and enters the continuous mud pumping step;

a mud lifting and pumping step, if the torque rises suddenly in the operation process of the mud scraper and exceeds the torque of the washing pipe plug and rises rapidly to the mud lifting and pumping torque, when the possibility of damaging the transmission speed reducer exists, the scraping arm group 9 needs to rise emergently, the mud pumping operation of the mud pumping pump 19 is continued in the rising process of the scraping arm group 9, when the mud scraping operation reaction force falls to be equal to the intermittent mud pumping torque force in the rising process of the scraping arm group 9, the scraping arm group 9 stops rising to enter the intermittent mud pumping program, when the mud scraping operation torque force falls to be equal to the intermittent mud breaking torque force, the mud pumping pump 19 stops pumping mud, the scraping arm group 9 starts to fall until the mud scraping operation reaction force is equal to the intermittent mud pumping torque force, then stops falling, the intermittent mud pumping program is continuously implemented, the process is repeated in such a way until the scraping arm group 9 falls to the lower limit position to recover the rated mud pumping program, and the start time of each mud pumping step depends on the actual value of the mud scraping operation reaction force of the mud scraper, which corresponding mud pumping step is implemented as the mud pumping operation at the start.

The specific operation flow of the invention is as follows:

when a sedimentation mud pumping program of a sedimentation tank mud scraper is carried out, whether a scraping arm group 9 is at a lower limit position is firstly confirmed, if the scraping arm group 9 is not at the lower limit position, the scraping arm lower group 9 is made to descend to a rated lower limit position, the mud scraper is started to operate, raw water 1 is injected into a sedimentation tank for raw water 1 sedimentation operation, the scraping arm group 9 operates to scrape bottom mud into the center of the sedimentation tank, intermittent mud pumping torsion and intermittent mud breaking torsion are set, the concentration of the pumped bottom mud is observed, when the sludge concentration is too thin, the intermittent mud breaking torsion is increased, the intermittent mud pumping time is prolonged, the bottom mud sinking time is prolonged, the amount of the scraping arm group 9 scraping the mud collection tank 17 is increased, the bottom mud liquid level above the mud collection tank 17 is increased, a mud discharge pump 19 cannot suck clear water in the tank, and the concentration of the pumped bottom mud is high and reaches a stable condition. When the sediment amount of the sediment at the bottom of the sedimentation tank is higher than the sediment amount of the sediment pump 19 in the intermittent sediment pumping step, a continuous sediment pumping procedure is started, the sediment pump 19 continuously operates to continuously pump the sediment, the sediment amount of the sediment pump 19 is larger than the sediment amount of the coagulated sludge 5 in the sedimentation tank, and the sediment is continuously pumped until the operation torque force of the scraping arm is reduced to the intermittent sediment pumping torque force and then the intermittent sediment pumping procedure is started. When the continuous mud pumping rated time is reached, the mud scraping reaction force of the scraper arm exceeds the continuous mud pumping torsion force and then continuously rises to the washing pipe plug discharging torsion force, the injection of the raw water 1 into the sedimentation tank is stopped, the mud blocking valve 37 on the mud discharging bottom pipe 18 and the mud discharging valve 34 on the mud discharging pipe 20 are locked to prevent mud in the mud discharging pipe 18 from flowing to the mud discharging pump 19, the clean water valve 35 on the clean water pipe 33 and the mud washing valve 36 on the mud washing pipe 32 are opened to guide the clean water above the sedimentation tank to flow to the mud discharging pump 19, the pressurized clean water of the mud discharging pump 19 is flushed into the mud discharging bottom pipe 18, after the mud discharging bottom pipe 18 is cleaned for the rated time, the mud scraping continuous mud pumping step is carried out after the valve position is reset, the raw water scraping operation reaction force is reduced to the intermittent mud pumping torsion force, and then the raw water is re-injected into the mud 1 to carry out the intermittent mud pumping step. When the torque force rises sharply and exceeds the torque force of the wash pipe plug in the running process of the mud scraper to quickly reach the mud lifting and pumping torque force and possibly damage a pit of the transmission speed reducer, the scraping arm set 9 is required to be lifted emergently, the mud pump 19 continuously pumps mud in the lifting process of the scraping arm set 9, when the mud scraping operation torsion is reduced to the intermittent mud pumping torsion in the lifting process of the scraping arm, the scraping arm set 9 is stopped to be lifted, and the intermittent mud pumping procedure is started, when the mud scraping torque force is reduced to the intermittent mud breaking torque force, the mud pumping pump 19 stops pumping mud, the scraping arm group 9 starts to descend until the mud scraping torque force is equal to the intermittent mud pumping torque force, then stops descending, continuously implements the intermittent mud pumping procedure, and repeating the steps until the scraping arm group 9 descends to the rated lower limit position to recover the rated mud pumping process, wherein the starting time of each mud pumping step is used as the corresponding mud pumping step to be executed when the mud pumping operation is started according to the actual numerical value of the operation reaction force of the mud scraper for scraping mud.

The constant torque mud pumping method for the high-concentration bottom mud of the mud scraper of the sedimentation tank implements an intermittent mud pumping step, so that when the mud pumping is performed by the mud pumping pump 19 during mud pumping operation, a mud collecting area 17 is covered by a bottom mud layer so as not to pump clear water into the sedimentation tank, and the discharged bottom mud has high concentration, uniformity and stability; in the sedimentation process of the sedimentation tank, when the sludge content in the raw water 1 is increased to ensure that the sludge discharge amount of the sludge discharge pump 19 is lower than the sedimentation amount of the sludge in the sedimentation tank in the intermittent sludge pumping step, the sludge discharge pump 19 automatically and continuously pumps the sludge to ensure that the sludge pumping operation torsion is reduced, and the sludge pumping program can be changed according to the change of the concentration of the raw water sludge to ensure that the sludge scraping operation torsion can be controlled within a rated value; when the sludge discharge bottom pipe 18 blocks the bottom sludge and is discharged without leading the sludge scraping operation torsion to rise, stopping injecting the raw water 1 into the sedimentation tank, starting the pipe washing and plug discharging step, pumping clear water in the sedimentation tank by a sludge discharge pump 19, flushing the clear water into the sludge discharge bottom pipe 18 to discharge the plugs, keeping the sludge discharge bottom pipe 18 smooth, and leading the sludge pumping operation to be stable; in the face of sudden torque force rising, the scraping arm set 9 can be forced to rise rapidly to reduce the operation torque force rapidly, the transmission speed reducer is prevented from being damaged, the operation reaction force is reduced by implementing the mud pumping step, and the scraping arm set 9 is made to descend to the rated position to recover the rated mud pumping procedure.

Claims

1. A method for pumping high-concentration bottom mud of a mud scraper of a sedimentation tank at a constant torque is characterized by comprising the following steps: the mud pumping time and the mud pumping procedure of the mud pump (19) are determined according to the operation reaction generated by scraping the bottom mud by the scraping arm group (9) of the sedimentation tank, and the method comprises the following steps:

an intermittent sludge pumping step, raw water (1) is injected into a sedimentation tank, the operation torque force generated by scraping bottom sludge by a sludge scraper is increased to a set intermittent sludge pumping torque force, a sludge discharge pump (19) is started to pump sludge within a rated time, the sludge pumping time reaches the rated value, then the sludge discharge pump (19) is closed to stop pumping sludge within the rated time, sludge pumping and sludge pumping stop alternately operate until the operation reaction force is reduced to the set intermittent sludge breaking torque force, the sludge discharge pump (19) stops operating, the operation reaction force of sludge scraping of a scraping arm group (9) is increased to the intermittent sludge pumping torque force and then enters an intermittent sludge pumping program, and the concentration of the pumped and removed bottom sludge is stabilized;

a continuous mud pumping step, when the mud scraping operation reaction force of the mud scraper arm group (9) rises to reach the set continuous mud pumping torsion, the mud discharging pump (19) continuously pumps bottom mud to ensure that the mud scraping operation reaction force of the mud scraper arm group (9) is reduced to the intermittent mud pumping torsion, the mud discharging pump (19) stops the continuous mud pumping step, and then the intermittent mud pumping step is carried out;

a pipe washing and plug discharging program, when the continuous mud pumping rated time operation torque force is still continuously surpassed the continuous mud pumping torque force to reach the pipe washing and plug discharging torque force, the injection of raw water (1) into the sedimentation tank is stopped to carry out the sedimentation operation of coagulated mud (5), the reaction force of mud scraping operation is stopped to rise again, then the bottom mud is blocked from flowing into the mud discharging pump (19), clear water above the sedimentation tank is led into the mud discharging pump (19) and is pressurized and flushed into the mud discharging bottom pipe (18) through the mud discharging pump to flush out the blockage, and then the step of continuous mud pumping is carried out;

a mud lifting and pumping step, if the torque rises suddenly in the operation process of the mud scraper and exceeds the torque of the washing pipe plug and rises quickly to the mud lifting and pumping torque, the transmission speed reducer is damaged, the scraper arm group (9) needs to rise emergently, the mud pump (19) continues to pump mud in the rising process of the scraper arm group (9), when the mud scraping operation reaction force drops to be equal to the intermittent mud pumping torque force in the rising process of the scraper arm group (9), the scraper arm group (9) stops rising to enter the intermittent mud pumping procedure, when the mud scraping operation reaction force drops to be equal to the intermittent mud breaking torque force, the mud pump (19) stops pumping mud, the scraper arm group (9) starts to drop until the mud scraping operation reaction force is equal to the intermittent mud pumping torque force, then stops dropping, the intermittent mud pumping procedure is continuously implemented, and the operation is repeated in such a way until the scraper arm group (9) drops to the rated lower limit position to recover the rated mud pumping procedure, the starting time of each mud pumping step is used as the corresponding mud pumping step to be implemented when the mud pumping operation is started according to the actual numerical value of the operation reaction force of mud scrapping of the mud scrapper.

2. The method for constant-torque pumping of high-concentration bottom mud of the mud scraper of the sedimentation tank as claimed in claim 1, wherein: when the step of pipe washing and plug discharging is carried out, a mud blocking valve (37) of the mud discharging bottom pipe (18) and a mud discharging valve (34) on the mud discharging pipe (31) are locked to prevent bottom mud from flowing into the mud discharging pump (19), a clean water valve (35) on the clean water pipe (33) and a mud washing valve (36) on the mud washing pipe (32) are opened, so that clean water above the sedimentation tank flows into the mud discharging pump (19) along with the clean water pipe (33) and is flushed into the mud discharging bottom pipe (18) by the pressurized mud washing pipe (32) to flush out blockages in the pipe, all control valves are switched to reset, and locked clean water flows into the mud discharging pump (19) to guide the bottom mud to flow into the mud discharging pump (19) and then enters the bottom mud pumping operation.