Energy-saving desulfurization absorption tower system for peak regulation unit

Abstract

The present application relates to a kind of energy-saving desulfurization absorption tower systems for peak-shaving unit, including inner tower, outer tower, liquid level regulator, inner processing device and outer processing device, outer tower is vertically fixedly arranged, its lateral wall is equipped with inside and outside through flue gas inlet, and the top of outer tower is equipped with inside and outside through flue gas outlet, liquid level regulator is communicated with the bottom of outer tower by pipeline;Inner tower is vertically fixedly installed in outer tower, and the gap between its outer wall and the inner wall of outer tower is left, and its upper and lower ends are both open, and the lower end of inner tower is located below flue gas inlet;Inner processing device is fixedly installed in inner tower, and outer processing device is fixedly installed between outer tower and inner tower area.The beneficial effects of the present application are mainly used for the flexible operation of thermal power peak-shaving unit, by adjusting the liquid level inside absorption tower to change the path of flue gas treatment, thereby reducing the energy consumption of desulfurization system under low load condition, improving the demisting efficiency under low load, and reducing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desulfurization absorption tower, and particularly relates to an energy-saving desulfurization absorption tower system for a peak shaving unit. BACKGROUND

[0002] Wind and light intermittent fluctuation characteristics, new energy installed capacity brings the problem of consumption. Compared with traditional fossil energy, wind power and photovoltaic have intermittent, fluctuation and weather dependence, which is harmful to the safe and stable operation of the power grid, and there is currently no technology to solve it. When the proportion of new energy power generation reaches a certain level, the difference between power supply and load curve will impact the safety and stability of the power grid, or lead to a large amount of wind and light abandonment. China's new energy consumption is weak, and new energy grid connection has caused problems on the power supply side and the grid side, which can lead to insufficient capacity and insufficient system flexibility during peak load. Under this background, the demand for peak shaving of thermal power will be greater and greater.

[0003] The power system has changed significantly under the new scenario, and the balance between power supply and demand has become more difficult. Thermal power, with its natural stability and controllability, will be assigned more power peak shaving tasks. The original load curve under the old scenario is relatively stable, and its flexibility can fully support the flexibility demand of the power system. However, under the new scenario, the power system has undergone the following four changes: 1) Compared with the original load curve, the peak-valley difference and volatility of the net load curve under the new scenario have increased significantly; 2) With the increase of renewable energy access ratio, the flexibility demand of the power system has increased significantly; 3) Renewable energy has replaced traditional power supply, and the capacity of conventional flexibility resources has therefore decreased significantly; 4) The traditional power supply and demand balance method can no longer envelop the net load in all time periods, and the power system has started to face a shortage of flexibility resources in some time periods.

[0004] Under the background of deep peak shaving, it is particularly important to study the stability and economy of thermal power units when they are running at ultra-low load. The problems and challenges brought by deep peak shaving to wet desulfurization mainly lie in two aspects:

[0005] (1) Energy-saving operation: In the wet desulfurization system, under the ultra-low load condition (10%~30% BMCR load), in order to ensure the spray coverage in the absorption tower and maintain the uniform flow effect of the spray layer to prevent short circuit of the flue gas, two or more circulating pumps (40%~60% spray amount) must be started, and the load rate and spray rate have low matching. As a major electricity consumer of wet desulfurization, this operation mode is poor in economy, which greatly affects the economic operation of the desulfurization system.

[0006] (2) Deep dust removal: The existing wet desulfurization back-end deep dust removal and mist removal device has a large amount of retention, especially the tube bundle type dust removal and mist removal device and the plate type mist removal device and the ridge type mist removal device based on the principle of mechanical dust removal and water film dust removal. When the unit is running at low load, the mechanical mist removal device will cause the collision intensity of particulate matter and liquid film to be greatly reduced due to insufficient separation flow rate, thereby reducing the overall dust removal and mist removal efficiency. In the face of new industry characteristics, how to ensure that the particulate matter and mist droplets under the ultra-low flow rate meet the conventional requirement that the conventional emission concentration is less than 5 mg / Nm3 is a technical problem that must be solved by practitioners. SUMMARY

[0007] The technical problem to be solved by the present application is to provide an energy-saving desulfurization absorption tower system for a peak-shaving unit, aiming at solving the problems in the prior art.

[0008] The technical solution for solving the above technical problem is as follows:

[0009] An energy-saving desulfurization absorption tower system for a peak-shaving unit, comprising an inner tower, an outer tower, a liquid level regulator, an inner treatment device and an outer treatment device, the outer tower is vertically fixedly arranged, a flue gas inlet is arranged on the side wall of the outer tower and penetrates the inner and outer towers, a flue gas outlet is arranged at the top of the outer tower and penetrates the inner and outer towers, and the liquid level regulator is communicated with the bottom of the outer tower through a pipeline; the inner tower is vertically fixedly arranged in the outer tower, a gap is left between the outer wall of the inner tower and the inner wall of the outer tower, and the upper and lower ends of the inner tower are both open; and the lower end of the inner tower is located below the flue gas inlet.

[0010] The inner treatment device is fixedly arranged in the inner tower, and the outer treatment device is fixedly arranged in the region between the outer tower and the inner tower.

[0011] The beneficial effects of the present application are as follows: during operation, when the peak-shaving unit of the thermal power plant is running at low load, the liquid level of the absorption tower is controlled to be a low-load liquid level by the operation of the liquid level regulator, and the flue gas can only pass through the gap between the outer tower and the inner tower, and at this time, the outer treatment device is used for treatment; when the peak-shaving unit of the thermal power plant is running at high load, the liquid level is adjusted to be a high-load liquid level, and the flue gas can pass through the inner tower and the outer tower, and at this time, the inner treatment device and the outer treatment device are used for treatment.

[0012] The present application is mainly used for flexible operation of the peak-shaving unit of the thermal power plant, the liquid level in the absorption tower is adjusted to change the path of flue gas treatment, thereby reducing the energy consumption of the desulfurization system under low load conditions, improving the mist removal efficiency under low load, and reducing the cost.

[0013] On the basis of the above technical solution, the present application can also be improved as follows.

[0014] Further, the inner treatment device comprises an inner sprayer fixedly installed in the inner tower, with an inlet extending to outside of the outer tower for spraying the desulfurization slurry downward.

[0015] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0016] Further, the inner treatment device comprises an inner sprayer fixedly installed in the inner tower, with an inlet extending to outside of the outer tower for spraying the desulfurization slurry downward.

[0017] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0018] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0019] Further, the inner treatment device comprises an inner sprayer fixedly installed in the inner tower, with an inlet extending to outside of the outer tower for spraying the desulfurization slurry downward.

[0020] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0021] Further, the inner treatment device comprises an inner sprayer fixedly installed in the inner tower, with an inlet extending to outside of the outer tower for spraying the desulfurization slurry downward.

[0022] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0023] Further, the inner treatment device comprises an inner sprayer fixedly installed in the inner tower, with an inlet extending to outside of the outer tower for spraying the desulfurization slurry downward.

[0024] The above further scheme has the beneficial effect that when the flue gas passes through the inner tower, the desulfurization slurry is sent to the inner sprayer by means conceivable to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer to desulfurize the flue gas, which is convenient for treatment.

[0025] The scheme realizes recycling of the desulfurization slurry by an external circulating pump, thereby saving cost.

[0026] Further, the external treatment device further comprises an external demister fixed around the region between the inner tower and the outer tower.

[0027] The beneficial effect of the above further scheme is that the external demister removes the fine fly ash and slurry droplets in the flue gas, further improves the cleanliness of the flue gas, and saves energy and protects the environment.

[0028] Further, the system further comprises an inner flusher fixedly installed in the inner tower, located between the inner sprayer and the inner demister, and having an inlet extending to the outside of the outer tower for upward flushing of the inner demister.

[0029] The beneficial effect of the above further scheme is that the inner flusher flushes when the system runs for a period of time and slurry and particulate matter accumulate, thereby ensuring the desulfurization effect.

[0030] Further, the system further comprises an outer flusher fixedly installed around the region between the inner tower and the outer tower, having an inlet extending to the outside of the outer tower for upward flushing of the outer demister.

[0031] The beneficial effect of the above further scheme is that the outer flusher flushes when the system runs for a period of time and slurry and particulate matter accumulate, thereby ensuring the desulfurization effect, and the outer flusher and the inner flusher independently run without interfering with each other.

[0032] Further, the system further comprises a water tank, the bottom of the water tank being in communication with one end of a water supply pipeline, the inlet of the inner flusher and the inlet of the outer flusher being respectively in communication with the other end of the water supply pipeline through pipelines, and a flushing water pump being fixedly installed on the water supply pipeline.

[0033] The beneficial effect of the above further scheme is that the flushing water pump sends clean water in the water tank to the inner flusher and the outer flusher during the flushing process, thereby avoiding accumulation of slurry and particulate matter and ensuring the desulfurization effect. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The figure is a schematic diagram of the overall structure of the present application.

[0035] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0036] 1, outer sprayer; 2, water tank; 3, inner tower; 4, flue gas inlet; 5, flue gas outlet; 6, outer circulating pump; 7, inner circulating pump; 8, outer tower; 9, outer demister; 10, inner demister; 11, gypsum discharge pump; 12, inner tower pressure gauge; 13, outer tower pressure gauge; 14, low load liquid level; 15, high load liquid level; 16, flushing water pump; 17, inner flusher; 18, outer flusher; 19, inner sprayer. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0040] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0041] Embodiment 1

[0042] As Figure 1As shown, the embodiment provides an energy-saving desulfurization absorption tower system for a peak-shaving unit, which comprises an inner tower 3, an outer tower 8, a liquid level regulator, an inner treatment device and an outer treatment device. The outer tower 8 is vertically fixedly arranged, and a flue gas inlet 4 is arranged on the sidewall of the outer tower 8 and penetrates the inner tower 3 and the outer tower 8. A flue gas outlet 5 is arranged at the top of the outer tower 8 and penetrates the inner tower 3 and the outer tower 8. The liquid level regulator is communicated with the bottom of the outer tower 8 through a pipeline. The inner tower 3 is vertically fixedly arranged in the outer tower 8, and a gap is left between the outer wall of the inner tower 3 and the inner wall of the outer tower 8. The upper end and the lower end of the inner tower 3 are both open. The lower end of the inner tower 3 is located below the flue gas inlet 4.

[0043] The inner treatment device is fixedly arranged in the inner tower 3, and the outer treatment device is fixedly arranged in the region between the outer tower 8 and the inner tower 3.

[0044] During operation, when the thermal power peak-shaving unit is in low-load operation, the liquid level of the absorption tower is controlled to be a low-load liquid level by the operation of the liquid level regulator. The flue gas can only pass through the gap between the outer tower 8 and the inner tower 3. At this time, the flue gas is treated by the outer treatment device. When the thermal power peak-shaving unit is in high-load operation, the liquid level is adjusted to be a high-load liquid level. The flue gas can pass through the inner tower 3 and the outer tower 8. At this time, the flue gas is treated by the inner treatment device and the outer treatment device.

[0045] Preferably, in the embodiment, the inner tower 3 and the outer tower 8 are both preferably cylindrical structures and are both made of anticorrosive materials.

[0046] Preferably, in the embodiment, the liquid level regulator is preferably a gypsum discharge pump 11. The inlet of the gypsum discharge pump 11 is communicated with the bottom of the outer tower 8 through a pipeline. The outlet of the gypsum discharge pump 11 is communicated with one end of a gypsum discharge pipeline. The other end of the gypsum discharge pipeline is communicated with a gypsum collection container.

[0047] Based on the above scheme, the lower part of the outer tower 8 is provided with a low-load liquid level 14 and a high-load liquid level 15.

[0048] In addition, the embodiment further comprises an inner tower pressure gauge 12 and an outer tower pressure gauge 13. The inner tower pressure gauge 12 and the outer tower pressure gauge 13 are both fixedly arranged outside the outer tower 8. The probes of the inner tower pressure gauge 12 and the outer tower pressure gauge 13 respectively extend into the inner tower 3 and the outer tower 8.

[0049] The embodiment is mainly used for flexible operation of a thermal power peak-shaving unit. The liquid level inside the absorption tower is adjusted to change the path of flue gas treatment, thereby reducing the energy consumption of the desulfurization system under low-load working conditions, improving the demisting efficiency under low load, and reducing the cost.

[0050] Embodiment 2

[0051] In this embodiment, the inner treatment device comprises an inner sprayer 19 fixedly installed in the inner tower 3, with its inlet extending to outside of the outer tower 8 for downward spraying of the desulfurization slurry.

[0052] When the flue gas passes through the inner tower 3, the desulfurization slurry (comprising limestone and calcium sulfate dihydrate) is sent to the inner sprayer 19 by means known to those skilled in the art, and the desulfurization slurry is sprayed downward by the inner sprayer 19 for desulfurization treatment of the flue gas, which is convenient.

[0053] Preferably, the inner sprayer 19 in this embodiment comprises a spraying pipe, one end of which extends to outside of the outer tower 8 as an inlet, and a plurality of downward nozzles are fixedly installed on the other end of the spraying pipe at uniform intervals.

[0054] In addition, the spraying pipe is preferably a coil pipe, which is rationally designed, has a large coverage area, and has a better spraying effect.

[0055] Embodiment 3

[0056] In this embodiment, the inner treatment device further comprises an inner circulating pump 7, an inlet of which is communicated with the bottom of the outer tower 8 through a pipeline, and an outlet of which is communicated with the inlet of the inner sprayer 19 through a pipeline.

[0057] When the flue gas passes through the inner tower 3, the desulfurization slurry in the outer tower 8 is sent to the inner sprayer 19 by the inner circulating pump 7, and the desulfurization slurry is sprayed downward by the inner sprayer 19 for desulfurization treatment of the flue gas, which is convenient.

[0058] This scheme realizes the recycling of the desulfurization slurry by the inner circulating pump 7, thereby saving cost.

[0059] Alternatively, the slurry in the tank containing the desulfurization slurry is sent to the inner sprayer 19 by a pump, and the sprayed slurry is collected at the bottom of the outer tower 8 and discharged by a gypsum discharge pump 11 communicated with the bottom of the outer tower 8. This way cannot realize the recycling of the slurry, and the cost is higher.

[0060] Embodiment 4

[0061] In this embodiment, the inner treatment device further comprises an inner mist eliminator 10 fixedly installed in the inner tower 3, which is located above the inner sprayer 19.

[0062] This scheme removes fine fly ash and slurry droplets in the flue gas by the inner mist eliminator 10, further improves the cleanliness of the flue gas, and is energy-saving and environmentally friendly.

[0063] It should be noted that the inner mist eliminator 10 is a prior art, and its specific structure and principle will not be described here.

[0064] Embodiment 5

[0065] In this embodiment, on the basis of Embodiment 4, the outer treatment device comprises an outer sprayer 1 fixed around the region between the inner tower 3 and the outer tower 8, with an inlet extending to the outside of the outer tower 8 for downward spraying of the desulfurization slurry.

[0066] When the flue gas passes between the inner tower 3 and the outer tower 8, the desulfurization slurry in the outer tower 8 is sent to the outer sprayer 1 by a method that can be conceived by those skilled in the art, and the desulfurization slurry is sprayed downward by the outer sprayer 1 to perform desulfurization treatment on the flue gas, which is convenient.

[0067] Preferably, in this embodiment, the above-mentioned outer sprayer 1 comprises a ring-shaped spraying pipe fixedly installed horizontally in the region between the inner tower 3 and the outer tower 8, with one end of the pipe in communication with a pipeline and the other end of the pipe extending to the outside of the outer tower 8 as an inlet; and a plurality of downwardly directed nozzles are fixedly installed on the ring-shaped spraying pipe at uniform intervals.

[0068] Embodiment 6

[0069] In this embodiment, on the basis of Embodiment 5, an outer circulating pump 6 is further included, with an inlet of the outer circulating pump 6 in communication with the bottom of the outer tower 8 through a pipeline and an outlet of the outer circulating pump 6 in communication with the inlet of the outer sprayer 1 through a pipeline.

[0070] When the flue gas passes between the inner tower 3 and the outer tower 8, the desulfurization slurry in the outer tower 8 is sent to the outer sprayer 1 by the outer circulating pump 6, and the desulfurization slurry is sprayed downward by the outer sprayer 1 to perform desulfurization treatment on the flue gas, which is convenient;

[0071] This scheme realizes the recycling of the desulfurization slurry by the outer circulating pump 6, thereby saving costs.

[0072] Embodiment 7

[0073] In this embodiment, on the basis of any one of Embodiments 5 to 6, the outer treatment device further comprises an outer demister 9 fixed around the region between the inner tower 3 and the outer tower 8.

[0074] This scheme removes fine fly ash and slurry droplets in the flue gas by the outer demister 9, further improving the cleanliness of the flue gas and achieving energy saving and environmental protection.

[0075] It should be noted that the above-mentioned outer demister 9 is a prior art, and its specific structure and principle will not be described here.

[0076] Embodiment 8

[0077] On the basis of embodiment 7, this embodiment further comprises an inner flusher 17 fixedly installed in the inner tower 3, which is located between the inner sprayer 19 and the inner demister 10, and the inlet thereof extends to the outside of the outer tower 8 for upward flushing of the inner demister 10.

[0078] After the system runs for a period of time, slurry and particulate matter may accumulate, and flushing is required, at which time the inner flusher 17 performs flushing to ensure the desulfurization effect.

[0079] Preferably, in this embodiment, the inner flusher 17 comprises a flushing pipe, one end of which extends to the outside of the outer tower 8 as an inlet, and the other end of which is fixedly installed with a plurality of upwardly directed nozzles at uniform intervals.

[0080] In addition, the flushing pipe is preferably designed to have a large coverage area and better flushing effect.

[0081] Embodiment 9

[0082] On the basis of embodiment 8, this embodiment further comprises an outer flusher 18 fixedly installed around the region between the inner tower 3 and the outer tower 8, and the inlet thereof extends to the outside of the outer tower 8 for upward flushing of the outer demister 9.

[0083] After the system runs for a period of time, slurry and particulate matter may accumulate, and flushing is required, at which time the outer flusher 18 performs flushing to ensure the desulfurization effect, and the outer flusher 18 and the inner flusher 17 operate independently and do not interfere with each other.

[0084] Preferably, in this embodiment, the outer flusher 18 comprises a ring-shaped flushing pipe fixedly installed horizontally in the region between the inner tower 3 and the outer tower 8, which is in communication with one end of a pipeline, and the other end of the pipeline extends to the outside of the outer tower 8 as an inlet; and the ring-shaped flushing pipe is fixedly installed with a plurality of upwardly directed nozzles at uniform intervals.

[0085] Embodiment 10

[0086] On the basis of embodiment 9, this embodiment further comprises a water tank 2, the bottom of which is in communication with one end of a water supply pipeline, and the inlets of the inner flusher 17 and the outer flusher 18 are respectively in communication with the other end of the water supply pipeline through pipelines; and a flushing water pump 16 is fixedly installed on the water supply pipeline.

[0087] During flushing, the flushing water pump 16 sends clean water in the water tank 2 to the inner flusher 17 and the outer flusher 18 to avoid accumulation of slurry and particulate matter and ensure the desulfurization effect.

[0088] The working principle of the present application is as follows:

[0089] (1) When the boiler load rate is as low as 20%, the absorption tower liquid level is adjusted to the low load liquid level 14 by slurry supply control, flushing control, and adjusting the operation of the gypsum discharge pump 11, at this time the absorption tower liquid level has a liquid seal effect on the inner tower 3 (open at the top and bottom), when the flue gas enters the absorption tower, it cannot enter the inner tower 3, but can only pass through the gap between the inner tower 3 and the outer tower 8.

[0090] At this time, the inner circulating pump 7 and the inner sprayer 19 can be stopped. By adjusting the flow of the outer circulating pump 6 and the outer sprayer 1, a slightly larger boiler load can complete the desulfurization efficiency task, while ensuring the slurry droplet concentration when the flue gas flows, without worrying about the problems of flue gas short circuit, uneven spraying, and low efficiency caused by low concentration of slurry, avoiding the problem of energy waste caused by opening more sprays to overcome the above problems. In addition, under the secondary working condition, only the outer demister 9 needs to be flushed, avoiding the waste of flushing water and the problem of water balance in the absorption tower under low load and low evaporation capacity.

[0091] (2) When the boiler load rate rises to 100%, the absorption tower liquid level is adjusted to the high load liquid level 15 by slurry supply control, flushing control, and adjusting the operation of the gypsum discharge pump 11, at this time the absorption tower liquid level has no liquid seal effect on the inner tower 3, when the flue gas enters the absorption tower, it can enter both the inner tower 3 and the outer tower 8. The inner circulating pump 7, the inner sprayer 19, the outer circulating pump 6, and the outer sprayer 1 are all opened.

[0092] (3) When the demister is flushed, the inner flusher 17 and the outer flusher 18 are opened at the same time. The desulfurization absorption tower system at this time is no different from the conventional system, and the present application does not interfere with the desulfurization system under high load.

[0093] The beneficial effects of the above technical solutions of the present application are as follows:

[0094] 1. Low load energy-saving operation. In a conventional wet desulfurization system, under the ultra-low load working condition of the thermal power peak-shaving unit (10% to 30% BMCR load), the desulfurization absorption tower must open two or even more circulating pumps (40% to 60% spraying amount) to ensure the absorption tower inner spraying coverage, maintain the flue gas uniform flow effect of the spraying layer, and prevent flue gas short circuit, with low load rate and spraying rate matching.

[0095] The absorption tower using the present application can, under the ultra-low load working condition, adjust the absorption tower liquid level to the low load liquid level by controlling the operation of the gypsum discharge pump, seal the flue gas entering the tower with water, and guide it to the gap between the inner tower and the outer tower, thereby reducing the flow area of the flue gas as a whole. This operation mode can effectively increase the spatial density of slurry droplets in the flue gas spraying section, solving the problem of flue gas short circuit under low load and low spraying amount. The spraying circulation amount can be reduced to a flow rate corresponding to 1:1 of the flue gas amount, without the need to open additional circulating pumps and spraying layers. This plays a role in saving the electricity consumption of the circulating pumps under low load.

[0096] 2. Low load increases dust and mist removal efficiency. The dust and mist removal device at the rear end of the desulfurization absorption tower needs a certain flow rate to maintain its mechanical collision effect, so as to effectively complete the dust and mist removal task. Under ultra-low load, due to the too low flow rate of the flue gas, the flue gas over-flowing flow rate of the dust and mist removal facility in the conventional absorption tower is too low, and the collision, coalescence and removal of the mist droplets and particulate matters cannot be effectively realized.

[0097] The absorption tower applying the scheme can guide all the flue gas to the gap between the inner tower and the outer tower under low load working condition, and the flue gas only completes the dust and mist removal process in the outer dust remover, and the flue gas flow rate is doubled compared with that under the conventional technology. Such a running mode can effectively increase the over-flowing speed of the low load mist remover, increase the dust and mist removal efficiency of the low load mist remover, and solve the problem that the deep dust removal of the ultra-low load peak regulation unit does not meet the standard.

[0098] 3. High load normal operation. The peak regulation unit under high load working condition adjusts the liquid level of the absorption tower to the high load liquid level by controlling the operation of the gypsum discharge pump, and the flue gas enters the inner tower and the outer tower at the same time. At this time, the desulfurization system is consistent with the conventional desulfurization system, and will not cause any influence on the operation of the system.

[0099] It should be noted that all the electronic components involved in the present application are of prior art, and the above-mentioned components are electrically connected with the controller, and the control circuit between the controller and each component is of prior art.

[0100] For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0101] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

[0102] The above description is only the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An energy efficient desulphurization absorption column system for a peak shaving unit characterized by: The application relates to a flue gas desulfurization tower, which comprises an inner tower (3), an outer tower (8), a liquid level regulator, an inner treatment device and an outer treatment device, wherein the outer tower (8) is vertically fixedly arranged, a flue gas inlet (4) penetrating the inner and outer towers is arranged on the sidewall of the outer tower (8), a flue gas outlet (5) penetrating the inner and outer towers is arranged at the top of the outer tower (8), and the bottom of the outer tower (8) is communicated with the liquid level regulator through a pipeline; the inner tower (3) is vertically fixedly arranged in the outer tower (8), a gap is left between the outer wall of the inner tower (3) and the inner wall of the outer tower (8), and the upper and lower ends of the inner tower (3) are both open; the lower end of the inner tower (3) is located below the flue gas inlet (4). The inner treatment device is fixedly arranged in the inner tower (3), and the outer treatment device is fixedly arranged in the region between the outer tower (8) and the inner tower (3).

2. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 1 wherein: The inner treatment device comprises an inner sprayer (19) fixedly arranged in the inner tower (3), the inlet of the inner sprayer (19) extends out of the outer tower (8) and is used for spraying desulfurization slurry downward.

3. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 2 wherein: An inner circulating pump (7) is further arranged, the inlet of the inner circulating pump (7) is communicated with the bottom of the outer tower (8) through a pipeline, and the outlet of the inner circulating pump (7) is communicated with the inlet of the inner sprayer (19) through a pipeline.

4. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 2 wherein: The inner treatment device further comprises an inner demister (10) fixedly arranged in the inner tower (3) and located above the inner sprayer (19).

5. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 4 wherein: The outer treatment device comprises an outer sprayer (1) fixedly arranged around the region between the inner tower (3) and the outer tower (8), the inlet of the outer sprayer (1) extends out of the outer tower (8) and is used for spraying desulfurization slurry downward.

6. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 5 wherein: An outer circulating pump (6) is further arranged, the inlet of the outer circulating pump (6) is communicated with the bottom of the outer tower (8) through a pipeline, and the outlet of the outer circulating pump (6) is communicated with the inlet of the outer sprayer (1) through a pipeline.

7. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 5 wherein: The outer treatment device further comprises an outer demister (9) fixedly arranged around the region between the inner tower (3) and the outer tower (8).

8. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 7 wherein: An inner flusher (17) is further arranged, the inner flusher (17) is fixedly arranged in the inner tower (3) and located between the inner sprayer (19) and the inner demister (10), the inlet of the inner flusher (17) extends out of the outer tower (8) and is used for flushing the inner demister (10) upward.

9. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 8 wherein: An outer flusher (18) is further arranged, the outer flusher (18) is fixedly arranged around the region between the inner tower (3) and the outer tower (8), the inlet of the outer flusher (18) extends out of the outer tower (8) and is used for flushing the outer demister (9) upward.

10. The energy efficient desulphurization absorption column system for a peak shaving unit as claimed in claim 9 wherein: A water tank (2) is further arranged, the bottom of the water tank (2) is communicated with one end of a water supply pipeline, the inlets of the inner flusher (17) and the outer flusher (18) are respectively communicated with the other end of the water supply pipeline through pipelines, and a flush water pump (16) is fixedly arranged on the water supply pipeline.

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