Desulfurization sludge discharge system

Abstract

The invention provides a desulfurization sludge discharge system, comprising: a gypsum discharge unit, which is communicated with a gypsum discharge position of a desulfurization system; the sludge discharge unit is communicated with a sludge discharge position of the desulfurization system; the gypsum discharge unit and the sludge discharge unit are communicated to the dehydration equipment; and in the dehydration equipment, sludge discharged by the sludge discharge unit covers the upper layer of gypsum discharged by the gypsum discharge unit. According to the technical scheme, the sludge discharge unit and the gypsum discharge unit are both communicated to the same dehydration device, the sludge is evenly distributed on the gypsum cake in the vacuum belt conveyor, filter cloth is not damaged, the vacuum degree is not damaged, double-way sludge discharge is achieved, a centrifugal dehydrator can be stopped for standby application, the maintenance cost is reduced, and the electricity consumption and the maintenance cost are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desulfurization sludge treatment, and particularly to a desulfurization sludge discharging system. BACKGROUND

[0002] At present, in order to ensure normal operation of a desulfurization system in a flue gas desulfurization project of a thermal power plant, desulfurization wastewater needs to be discharged periodically. As end wastewater of the power plant, the desulfurization wastewater needs to be treated strictly. The treatment of a large amount of desulfurization wastewater will inevitably result in the generation of a large amount of desulfurization sludge. After dewatering treatment, most of the water in the sludge which is originally in a high water content and in a form of thin slurry is removed to obtain a mud cake with a certain shape and a low water content.

[0003] The existing gypsum and sludge dewatering of the desulfurization system of the power plant is performed on a vacuum belt conveyor and a centrifugal dewatering machine respectively. In actual operation, the separation effect of the centrifugal dewatering machine is poor, and mud cake cannot be formed, which causes environmental pollution of the sludge and serious corrosion of the heating system, and increases the maintenance amount of the maintenance personnel. SUMMARY

[0004] The present application aims to provide a desulfurization sludge discharging system which can perform sludge dewatering and discharging while performing gypsum dewatering, and realize mixed discharging of gypsum and sludge. The present application provides a desulfurization sludge discharging system, comprising: a gypsum discharging unit which is connected to a gypsum discharging position of a desulfurization system; a sludge discharging unit which is connected to a sludge discharging position of the desulfurization system; and a dewatering device to which the gypsum discharging unit and the sludge discharging unit are connected; and in the dewatering device, the sludge discharged by the sludge discharging unit is overlaid on an upper layer of the gypsum discharged by the gypsum discharging unit.

[0005] Further, the system further comprises a distribution unit which is connected to the sludge discharging unit, and the sludge discharging unit overlies the sludge on the upper layer of the gypsum through the distribution unit.

[0006] Further, the dewatering device comprises a vacuum belt conveyor.

[0007] Further, the distribution unit comprises a distributor which is arranged above a filter cloth of the vacuum belt conveyor and is located downstream of a gypsum discharging position of the vacuum belt conveyor.

[0008] Further, the distribution unit comprises a filter groove box which is connected to one side of the distributor and is connected to the distributor, and the sludge discharging unit is connected to the filter groove box.

[0009] Further, the bottom of the distributor is connected to a smoothing curtain which is in contact with the surface of the filter cloth of the vacuum belt conveyor.

[0010] Further, the number of the vacuum belt machines is multiple.

[0011] Further, the sludge discharging unit comprises a discharging main pipe and multiple discharging branch pipes, the discharging branch pipes are communicated with the discharging main pipe respectively, and each of the discharging branch pipes is communicated to the filter tank box of a different vacuum belt machine.

[0012] Further, a shunt valve is arranged between the discharging main pipe and the discharging branch pipes.

[0013] Further, the sludge discharging unit is also communicated with a flushing water pipe.

[0014] The technical scheme of the present application communicates the sludge discharging unit and the gypsum discharging unit to the same dewatering equipment, and uniformly distributes the sludge on the gypsum cake in the vacuum belt machine, which does not damage the filter cloth and does not destroy the vacuum degree, realizes double sludge discharging, can stop using the centrifugal dewatering machine as a backup, reduces the maintenance cost, saves the power consumption and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed to be used in the following specific embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a whole schematic view of the desulfurization sludge discharging system of the present application. Figure 2 It is a schematic view of the sludge discharging unit and the distribution unit of the present application. Figure 3 It is a side view and enlarged schematic view of the troweling curtain of the present application. Figure 4 It is a schematic view of the sludge on the upper layer of gypsum of the present application. Explanation of reference signs: 1 - gypsum discharging place of the desulfurization system; 2 - sludge discharging place of the desulfurization system; 3 - gypsum discharging unit; 4 - sludge discharging unit; 41 - discharging main pipe; 42 - discharging branch pipe; 43 - shunt valve; 5 - vacuum belt machine; 51 - filter cloth; 52 - gypsum; 53 - sludge; 6 - distribution unit; 61 - distributor; 62 - filter tank box; 63 - small hole; 64 - troweling curtain; 65 - flushing pipe; 66 - hose; 7 - flushing water pipe. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] Embodiment 1 As Figures 1-4 shown, the present application provides a desulfurization sludge discharge system, comprising: a gypsum discharge unit 3, the gypsum discharge unit 3 is communicated with a gypsum discharge place 1 of a desulfurization system; a sludge discharge unit 4, the sludge discharge unit 4 is communicated with a sludge discharge place 2 of the desulfurization system; a dewatering device, the gypsum discharge unit 3 and the sludge discharge unit 4 are both communicated to the dewatering device; and in the dewatering device, the sludge 53 discharged by the sludge discharge unit 4 is covered on the upper layer of the gypsum 52 discharged by the gypsum discharge unit 3.

[0021] Specifically, the gypsum 52 is a byproduct of the desulfurization reaction, which is generated directly in the absorption tower through a chemical reaction, and the gypsum discharge unit 3 is connected to the gypsum discharge port of the absorption tower. The desulfurization clarifier is a place where the sludge 53 is finally precipitated and concentrated, and the sludge discharge unit 4 is connected to the sludge discharge port of the desulfurization clarifier. The present application connects the sludge discharge pump outlet pipeline under the desulfurization clarifier to the discharge port of the dewatering device (three vacuum belt dewatering machines) respectively, so that the dewatering of the gypsum 52 and the dewatering and discharge of the sludge 53 are carried out at the same time. Through calculation, test and analysis, a solution for realizing the mixed discharge of the desulfurization gypsum 52 and the sludge 53 is found.

[0022] Embodiment 2 The distribution unit 6 is further included, which is connected to the sludge discharge unit 4, and the sludge discharge unit 4 evenly covers the sludge 53 on the upper layer of the gypsum 52 through the distribution unit 6. The dewatering device includes a vacuum belt machine 5. The distribution unit 6 includes a distributor 61, which is arranged above the filter cloth 51 of the vacuum belt machine 5 and is located downstream of the gypsum discharge port of the vacuum belt machine 5. The distribution unit 6 includes a filter groove box 62, which is connected to one side of the distributor 61 and is in communication with the distributor 61, and the sludge discharge unit 4 is connected to the filter groove box 62. The bottom of the distributor 61 is connected with a leveling curtain 64, which is in contact with the surface of the filter cloth 51 of the vacuum belt machine 5.

[0023] Specifically, the vacuum belt machine 5 is a prior art in the field, which separates the solid particles in the slurry from the liquid by using the vacuum suction force and the mechanical movement of the filter cloth (belt). In this embodiment and the accompanying drawings, only the structure above the filter cloth is shown, and the other parts are not described or shown.

[0024] The distributor 61 is additionally provided with the filter groove box 62, which is arranged above the head of the vacuum belt machine 5, the top of the filter groove box 62 is opened to receive the sludge 53 discharged from the discharge branch pipe 42, and the bottom of the filter groove box 62 is provided with uniform small holes 63 for filtering and leaking the sludge 53 to the filter cloth 51 below. The leveling curtain 64 is a soft curtain hung at the bottom of the distributor, the bottom of which is in contact with the filter cloth and makes the leveling curtain 64 curved, and the sludge 53 is evenly spread on the upper layer of the gypsum 52 through the leveling curtain 64, so as to ensure that the sludge 53 is evenly distributed on the gypsum cake to form a uniform distribution of 0.5MM film, which does not damage the filter cloth 51 and does not destroy the vacuum degree of the vacuum belt machine 5.

[0025] In addition, a flushing pipe 65 is arranged on the side of the distributor 61 opposite to the filter groove box 62, the flushing pipe 65 is connected to the flushing water through a hose 66, and the filter cloth 51 can be flushed after work.

[0026] Embodiment 3 The number of vacuum belt machines 5 is multiple. The sludge discharging unit 4 comprises a discharging main pipe 41 and multiple discharging branch pipes 42, the discharging branch pipes 42 are respectively communicated with the discharging main pipe 41, and each discharging branch pipe 42 is respectively communicated to the filter groove box 62 of a different vacuum belt machine 5. A shunt valve 43 is arranged between the discharging main pipe 41 and the discharging branch pipe 42.

[0027] Specifically, the number of vacuum belt machines 5 is three, and each vacuum belt machine 5 is communicated with the discharging branch pipe 42 through the shunt valve 43. By switching the shunt valve 43, the discharging branch pipe 42 is controlled to discharge, and the three vacuum belt machines 5 are switched and used.

[0028] Embodiment 4 The sludge discharging unit 4 is also communicated with a flushing water pipe 7.

[0029] Specifically, after the sludge discharging pipe discharges the sludge 53, the flushing water pipe 7 is added for flushing.

[0030] The technical scheme of the present application adds a sludge discharging pipe and a shunt valve 43, and after the sludge discharging pipe discharges the sludge 53, the flushing water pipe 7 is added for flushing; the distributor 61 is communicated with the filter groove box 62, so that the sludge 53 is uniformly distributed on the gypsum 52 cake of the vacuum belt machine 5. The advantages are that the gypsum 52 and the sludge 53 are mixed and discharged, and can be switched among the three vacuum belt machines 5, the sludge 53 is uniformly distributed on the gypsum cake, which does not damage the filter cloth 51 and does not destroy the vacuum degree. The double sludge discharging path is realized, the centrifugal dewatering machine is standby and shut down, the maintenance cost is reduced, the annual power saving amount is 46875KW, and the annual maintenance cost is about 45,000 yuan.

[0031] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A desulfurization sludge discharge system, characterized in that, include: A gypsum discharge unit, wherein the gypsum discharge unit is connected to the gypsum discharge point of the desulfurization system; A sludge discharge unit, wherein the sludge discharge unit is connected to the sludge discharge point of the desulfurization system; The dewatering equipment includes a gypsum discharge unit and a sludge discharge unit, both of which are connected to the dewatering equipment. Within the dewatering equipment, the sludge discharged by the sludge discharge unit covers the gypsum discharged by the gypsum discharge unit.

2. The desulfurization sludge discharge system according to claim 1, characterized in that, It also includes a distribution unit, which is connected to the sludge discharge unit, and the sludge discharge unit uses the distribution unit to evenly cover the sludge onto the gypsum layer.

3. The desulfurization sludge discharge system according to claim 2, characterized in that, The dehydration equipment includes a vacuum belt conveyor.

4. The desulfurization sludge discharge system according to claim 3, characterized in that, The distribution unit includes a distributor, which is located above the filter cloth of the vacuum belt conveyor and downstream of the gypsum discharge point on the vacuum belt conveyor.

5. The desulfurization sludge discharge system according to claim 4, characterized in that, The distribution unit includes a filter box, which is connected to one side of the distributor and communicates with the distributor. The sludge discharge unit is connected to the filter box.

6. The desulfurization sludge discharge system according to claim 4, characterized in that, The bottom of the distributor is connected to a smoothing curtain, which is in contact with the filter cloth surface of the vacuum belt conveyor.

7. The desulfurization sludge discharge system according to claim 5, characterized in that, The number of vacuum belt conveyors is multiple.

8. The desulfurization sludge discharge system according to claim 7, characterized in that, The sludge discharge unit includes a main discharge pipe and multiple branch discharge pipes. The branch discharge pipes are connected to the main discharge pipe, and each branch discharge pipe is connected to the filter box of a different vacuum belt conveyor.

9. The desulfurization sludge discharge system according to claim 8, characterized in that, A branch valve is provided between the main discharge pipe and the branch discharge pipe.

10. The desulfurization sludge discharge system according to claim 1, characterized in that, The sludge discharge unit is also connected to a flushing water pipe.

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