Atomizer overflow protection system

Abstract

The utility model relates to the technical field of flue gas desulfurization, in particular to an atomizer overflow protection system which comprises a desulfurization tower, a volute conical hopper, an atomizer, a slurry pipeline and a temperature detection unit, the volute conical hopper is arranged at the top end of the desulfurization tower, and an installation platform is arranged at the bottom end of the atomizer. The atomizer is arranged at the bottom end of the volute conical hopper through the mounting platform, the slurry pipeline extends into the volute conical hopper from the outside of the desulfurizing tower and is connected with the atomizer, and the temperature detection unit is arranged on the mounting platform and is used for detecting the temperature at the bottom end of the volute conical hopper. The temperature detection unit is arranged to detect the temperature of the bottom end of the volute conical hopper in real time, and when the detected temperature is lower than the normal environment temperature, it is judged that slurry leaks, so that an atomizer can be controlled to stop in time, a slurry pipeline is cut off, and excessive loss is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to an overflow protection system for an atomizer. Background Art

[0002] The SDA semi-dry desulfurization process generally uses quicklime and baking soda as desulfurizing agents. The desulfurizing agent slurry is transported to a rotary atomizer at the top of a desulfurization tower by a pump. Under the action of the high-speed rotation of the atomizing wheel of the atomizer, droplets are formed and react with SO2 in the flue gas. SO2 in the flue gas is absorbed and purified to form desulfurized ash products. A small part of the large-particle desulfurized ash precipitates to the bottom of the desulfurization tower and is discharged. Most of the desulfurized ash enters a bag filter through the flue pipeline after the desulfurization tower along with the flue gas for purification to remove dust and other particulate matters. The treated flue gas is then purified by a denitration system and discharged through a chimney.

[0003] Among them, the atomizer is the core equipment in this set of process systems. It is installed at the bottom of a volute cone at the top of the desulfurization tower, and the required slurry is transported through a slurry pipeline. Due to the narrow space, high temperature, large dust at the installation position of the atomizer, and factors such as pipeline erosion and abrasion, it is extremely easy to cause the slurry pipeline to perforate or the pipeline connection components to become loose, resulting in the leakage of the slurry in the slurry pipeline or the protective water in the protective water pipeline and flooding the bottom end of the volute cone, leading to serious water ingress into the atomizer and damage to the internal working components. Therefore, an overflow protection device must be installed at the volute cone where the atomizer is installed.

[0004] However, the currently used overflow protection devices either have too low sensitivity, resulting in the failure of the protection in case of an overflow accident and causing damage to the atomizer soaked by the slurry; or have too high sensitivity, generating false protection actions without an overflow, leading to the interlock tripping of other equipment together, directly affecting the flue gas emission index and causing unnecessary environmental protection incidents. Content of the Utility Model

[0005] The purpose of the utility model is to provide an overflow protection system for an atomizer, which can accurately judge whether an overflow fault occurs in the atomizer in the first time and improve the reliability of the overflow protection of the atomizer.

[0006] To achieve the above purpose, the utility model provides an overflow protection system for an atomizer, including a desulfurization tower, a volute cone, an atomizer, a slurry pipeline and a temperature detection unit. The volute cone is arranged at the top of the desulfurization tower. The bottom end of the atomizer is provided with an installation platform. The atomizer is arranged at the bottom end of the volute cone through the installation platform. The slurry pipeline extends from outside the desulfurization tower into the volute cone and is connected to the atomizer. The temperature detection unit is arranged on the installation platform and is used to detect the temperature at the bottom end of the volute cone.

[0007] Optionally, a pipe joint is provided on the installation platform, and the slurry pipe is connected to the internal pipeline of the atomizer through the pipe joint.

[0008] Optionally, the atomizer overflow protection system further includes a control unit, which is communicatively connected to the temperature detection unit, the atomizer, and the cut-off valve on the slurry pipe. When the temperature detected by the temperature detection unit is lower than the set temperature, it can send a shutdown signal to the control unit, and the control unit controls the atomizer to shut down and controls the cut-off valve to close.

[0009] Optionally, the atomizer overflow protection system further includes an alarm unit, which is communicatively connected to the control unit. When the control unit receives the shutdown signal, it controls the alarm unit to give an alarm.

[0010] Optionally, the temperature detection unit includes at least two temperature sensors;

[0011] When the control unit receives shutdown signals sent by at least two of the temperature sensors, it controls the alarm unit to give an alarm, and at the same time controls the atomizer to shut down and controls the cut-off valve to close;

[0012] When the control unit only receives a shutdown signal sent by one of the temperature sensors, it only controls the alarm unit to give an alarm.

[0013] Optionally, the temperature sensors are evenly distributed on the same horizontal plane of the installation platform.

[0014] Optionally, the temperature of the slurry flowing in the slurry pipe is lower than the normal ambient temperature at the bottom end of the volute cone hopper, and the set temperature is between the temperature of the slurry flowing in the slurry pipe and the normal ambient temperature at the bottom end of the volute cone hopper.

[0015] In the atomizer overflow protection system provided by the present utility model, there are at least one of the following beneficial effects:

[0016] 1) Since the normal ambient temperature at the bottom end of the volute cone hopper is generally greater than 50 °C when the atomizer is working normally and the slurry does not leak, while the temperature of the slurry is usually lower than 40 °C. Therefore, by setting a temperature detection unit on the installation platform to detect the temperature at the bottom end of the volute cone hopper in real time, when the slurry leaks, it will inevitably soak the installation platform and then submerge the temperature detection unit. At this time, the temperature detected by the temperature detection unit will drop sharply and be lower than the normal ambient temperature. From this, it can be judged that the slurry has leaked. At this time, the atomizer can be controlled to shut down in time, and the slurry pipe can be cut off to avoid causing excessive losses;

[0017] 2) By setting at least two temperature sensors, when the control unit receives shutdown signals sent by at least two temperature sensors, it determines that there is slurry leakage, that is, an overflow event has occurred. At this time, the alarm unit gives an alarm, and at the same time immediately controls the atomizer to stop and controls the cut-off valve to close. When the control unit only receives a shutdown signal sent by one temperature sensor, it controls the alarm unit to give an alarm to remind the operator to confirm and judge manually, preventing unnecessary misoperations of the atomizer. Thus, it can accurately judge whether the atomizer has an overflow failure in the first time, effectively avoiding the occurrence of undetected events, and greatly improving the reliability of the atomizer overflow protection;

[0018] 3) The whole structure is simple, the operation is simple, the maintenance is convenient, the reliability is high, and no daily maintenance is required, reducing the safety risk of manual on-line maintenance of equipment, and it has strong practicability. Description of the Drawings

[0019] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present utility model, and do not constitute any limitation to the scope of the present utility model. Among them:

[0020] Figure 1 It is a schematic structural diagram of an atomizer overflow protection system provided by an embodiment of the present utility model.

[0021] In the drawings:

[0022] 1 - desulfurization tower; 2 - volute hopper; 3 - atomizer; 4 - slurry pipeline; 5 - temperature detection unit; 6 - installation platform; 7 - control unit; 8 - alarm unit. Detailed Embodiments

[0023] To make the objectives, advantages and features of the present utility model clearer, the following further describes the present utility model in detail with reference to the drawings and specific embodiments. It should be noted that the drawings are in a very simplified form and all use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the embodiments of the present utility model. To make the objectives, features and advantages of the present utility model more obvious and understandable, please refer to the drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Any modification of the structure, change of the proportional relationship or adjustment of the size, under the condition of being the same or approximate to the effects that the present utility model can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model.

[0024] As used in the present utility model, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. As used in the present utility model, the term "or" is generally used in the sense of including "and / or" unless the context clearly dictates otherwise. As used in the present utility model, the term "several" is generally used in the sense of including "at least one" unless the context clearly dictates otherwise. As used in the present utility model, the term "at least two" is generally used in the sense of including "two or more" unless the context clearly dictates otherwise. In addition, the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features.

[0025] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Please refer to Figure 1 , this embodiment provides an atomizer overflow protection system, including a desulfurization tower 1, a volute hopper 2, an atomizer 3, a slurry pipeline 4 and a temperature detection unit 5. The volute hopper 2 is arranged at the top of the desulfurization tower 1. An installation platform 6 is arranged at the bottom end of the atomizer 3. The atomizer 3 is arranged at the bottom end of the volute hopper 2 through the installation platform 6. The slurry pipeline 4 extends from outside the desulfurization tower 1 into the volute hopper 2 and is connected to the atomizer 3. The temperature detection unit 5 is arranged on the installation platform 6 and is used to detect the temperature at the bottom end of the volute hopper 2.

[0027] The working principle of the present utility model is as follows:

[0028] Since the normal ambient temperature at the bottom end of the volute hopper 2 is generally greater than 50 °C when the atomizer 3 is working properly and the slurry does not leak, while the temperature of the slurry is usually lower than 40 °C, a temperature detection unit 5 is provided on the installation platform 6 to detect the temperature at the bottom end of the volute hopper 2 in real time. When the slurry leaks, it will inevitably soak the installation platform 6 and then submerge the temperature detection unit 5. At this time, the temperature detected by the temperature detection unit 5 will drop sharply and be lower than the normal ambient temperature. Thus, it can be judged that the slurry has leaked. At this time, the atomizer 3 can be controlled to stop in time, and the slurry pipeline 4 can be cut off to avoid excessive losses.

[0029] In this embodiment, a pipe joint is provided on the installation platform 6, and the slurry pipeline 4 is connected to the internal pipeline of the atomizer 3 through the pipe joint. It should be noted that, in addition to the slurry pipeline 4, generally, protection water pipelines such as flushing pipelines and cooling water pipelines are also provided. These pipelines are generally also connected to the internal pipeline of the atomizer 3 through the pipe joints provided on the installation platform 6. If these pipelines leak, it will also cause the atomizer 3 to be damaged by water ingress. At this time, the temperature detection unit 5 can also detect whether there is a leak. The present utility model will not list them one by one.

[0030] In this embodiment, the volute hopper 2 is arranged at the top of the desulfurization tower 1, and its diameter gradually decreases from top to bottom. The inside of the volute hopper 2 is a cavity, which can be used to arrange equipment such as motors, and the motor is used to drive the atomizer 3 to work.

[0031] Preferably, the atomizer overflow protection system further includes a control unit 7. The control unit 7 is communicatively connected to the temperature detection unit 5, the atomizer 3, and the cut-off valve on the slurry pipeline 4. When the temperature detected by the temperature detection unit 5 is lower than the set temperature, it can send a shutdown signal to the control unit 7, and the control unit 7 controls the atomizer 3 to stop and controls the cut-off valve to close. In this embodiment, when the temperature detected by the temperature detection unit 5 is lower than the set temperature, it sends a shutdown signal to the control unit 7. After receiving the shutdown signal, the control unit 7 immediately controls the atomizer 3 to stop and controls the cut-off valve to close to prevent the slurry from continuing to be transported and leaked, resulting in the expansion of the accident.

[0032] In this embodiment, the control unit 7 includes but is not limited to a PLC or a single-chip microcomputer.

[0033] In this embodiment, the temperature of the slurry flowing in the slurry pipeline 4 is lower than the normal ambient temperature at the bottom end of the volute hopper 2. The set temperature is, for example, between the temperature of the slurry flowing in the slurry pipeline 4 and the normal ambient temperature at the bottom end of the volute hopper 2. This set temperature can be set manually, and the present utility model does not limit this. For example, the set temperature is 45 °C.

[0034] Furthermore, the atomizer overflow protection system further includes an alarm unit 8. The alarm unit 8 is communicatively connected to the control unit 7. When the control unit 7 receives a shutdown signal, it controls the alarm unit 8 to give an alarm. The alarm unit 8 emits an alarm signal to remind the operator, facilitating the operator to handle it in a timely manner. The alarm unit 8 includes, but is not limited to, a sound alarm, a light alarm, or an audible and visual alarm.

[0035] Even further, the temperature detection unit 5 includes at least two temperature sensors;

[0036] When the control unit 7 receives shutdown signals sent by at least two temperature sensors, it controls the alarm unit 8 to give an alarm, and at the same time controls the atomizer 3 to shut down and controls the cut-off valve to close;

[0037] When the control unit 7 only receives a shutdown signal sent by one temperature sensor, it only controls the alarm unit 8 to give an alarm.

[0038] By setting at least two temperature sensors, when the control unit 7 receives shutdown signals sent by at least two temperature sensors, it determines that there is slurry leakage, that is, an overflow event has occurred. At this time, the alarm unit 8 gives an alarm, and at the same time immediately controls the atomizer 3 to shut down and controls the cut-off valve to close. When the control unit 7 only receives a shutdown signal sent by one temperature sensor, it controls the alarm unit 8 to give an alarm, reminding the operator to confirm and judge manually, preventing unnecessary misoperations of the atomizer 3, so as to be able to accurately judge whether the atomizer 3 has an overflow failure in the first time.

[0039] Preferably, the alarm unit 8 can emit at least two different alarm signals. For example, when the control unit 7 receives shutdown signals sent by at least two temperature sensors, the alarm unit 8 emits an audible and visual alarm. When the control unit 7 only receives a shutdown signal sent by one temperature sensor, the alarm unit 8 emits a sound alarm; or when the control unit 7 receives shutdown signals sent by at least two temperature sensors, the alarm unit 8 emits a sound + red light alarm. When the control unit 7 only receives a shutdown signal sent by one temperature sensor, the alarm unit 8 emits a sound + yellow light alarm. The present invention does not limit this. Therefore, as long as the control unit 7 receives a shutdown signal, it will give an alarm. At this time, manual judgment can effectively avoid the occurrence of missed inspection events, greatly improving the reliability of the atomizer overflow protection, and there is no need for daily maintenance, reducing the safety risk of manual on-line maintenance of equipment.

[0040] It should be noted that the temperature sensors, the control unit 7, and the alarm unit 8 mentioned in the present invention are all prior arts. The present invention does not involve improvements in computer programs. The present invention only involves the combination of existing modules. At the same time, those skilled in the art should know how to specifically implement the communication connection between the control unit 7 and other devices.

[0041] Preferably, the temperature sensors are evenly distributed on the same horizontal plane of the mounting platform 6 to improve the accuracy of temperature detection results. In this embodiment, there are 3 temperature sensors which are symmetrically arranged at an angle of 120° to each other, but the present invention is not limited thereto.

[0042] Based on the same inventive concept, the embodiment of the present invention further provides an overflow protection method for an atomizer, which uses the above-mentioned overflow protection system for the atomizer 3 to perform overflow protection, including the following steps:

[0043] S1. When the atomizer 3 is operating normally, the temperature at the bottom end of the volute hopper 2 is detected in real time by the temperature detection unit 5;

[0044] S2. When the temperature detected by the temperature detection unit 5 is lower than the set temperature, the atomizer 3 is controlled to stop operating, and the slurry pipeline 4 is cut off.

[0045] Preferably, the overflow protection system for the atomizer further includes an alarm unit 8. The temperature detection unit 5 includes at least two temperature sensors. When the temperatures detected by at least two temperature sensors are both lower than the set temperature, the alarm unit 8 is controlled to give an alarm, and at the same time, the atomizer 3 is controlled to stop operating and the slurry pipeline 4 is cut off;

[0046] When only one temperature sensor detects that the temperature is lower than the set temperature, only the alarm unit 8 is controlled to give an alarm.

[0047] In summary, the embodiment of the present invention provides an overflow protection system for an atomizer. By setting the temperature detection unit 5 on the mounting platform 6 to detect the temperature at the bottom end of the volute hopper 2 in real time, when the slurry leaks, it will surely soak the mounting platform 6 and then submerge the temperature detection unit 5. At this time, the temperature detected by the temperature detection unit 5 will drop sharply and be lower than the normal ambient temperature. Thus, it can be judged that the slurry has leaked. At this time, the atomizer 3 can be controlled to stop operating in time, and the slurry pipeline 4 can be cut off to avoid causing excessive losses. In addition, by setting at least two temperature sensors, when the control unit 7 receives the shutdown signals sent by at least two temperature sensors, it judges that there is slurry leakage, that is, an overflow event has occurred. At this time, the alarm unit 8 gives an alarm, and at the same time, the atomizer 3 is immediately controlled to stop operating and the cut-off valve is controlled to close. When the control unit 7 only receives the shutdown signal sent by one temperature sensor, the alarm unit 8 is controlled to give an alarm to remind the operator to confirm and judge manually, preventing unnecessary misoperations of the atomizer 3. Thus, it can accurately judge whether the atomizer 3 has an overflow failure in the first time, effectively avoiding the occurrence of missed detection events and greatly improving the reliability of the overflow protection of the atomizer.

[0048] It should also be recognized that although the present utility model has been disclosed above in preferred embodiments, the above embodiments are not intended to limit the present utility model. For any person skilled in the art, without departing from the scope of the technical solution of the present utility model, many possible changes and modifications can be made to the technical solution of the present utility model by using the technical content disclosed above, or it can be modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still belong to the scope protected by the technical solution of the present utility model.

Claims

1. An atomizer overflow protection system, characterized in that, It includes a desulfurization tower, a volute cone hopper, an atomizer, a slurry pipeline and a temperature detection unit. The volute cone hopper is arranged at the top of the desulfurization tower. An installation platform is provided at the bottom end of the atomizer. The atomizer is arranged at the bottom end of the volute cone hopper through the installation platform. The slurry pipeline extends from outside the desulfurization tower into the volute cone hopper and is connected to the atomizer. The temperature detection unit is arranged on the installation platform and is used to detect the temperature at the bottom end of the volute cone hopper.

2. The atomizer overflow protection system according to claim 1, characterized in that A pipeline joint is provided on the installation platform. The slurry pipeline is connected to the internal pipeline of the atomizer through the pipeline joint.

3. The atomizer overflow protection system according to claim 1, wherein The atomizer overflow protection system further includes a control unit. The control unit is communicatively connected to the temperature detection unit, the atomizer and a cut-off valve on the slurry pipeline. When the temperature detected by the temperature detection unit is lower than the set temperature, it can send a shutdown signal to the control unit. The control unit controls the atomizer to shut down and controls the cut-off valve to close.

4. The atomizer overflow protection system according to claim 3, wherein, The atomizer overflow protection system further includes an alarm unit. The alarm unit is communicatively connected to the control unit. When the control unit receives the shutdown signal, it controls the alarm unit to give an alarm.

5. The atomizer overflow protection system according to claim 4, wherein The temperature detection unit includes at least two temperature sensors; When the control unit receives shutdown signals sent by at least two of the temperature sensors, it controls the alarm unit to give an alarm, and at the same time controls the atomizer to shut down and controls the cut-off valve to close; When the control unit only receives a shutdown signal sent by one of the temperature sensors, it only controls the alarm unit to give an alarm.

6. The atomizer overflow protection system according to claim 5, characterized in that, The temperature sensors are evenly distributed on the same horizontal plane of the installation platform.

7. The atomizer overflow protection system according to claim 3, wherein The temperature of the slurry flowing in the slurry pipeline is lower than the normal ambient temperature at the bottom end of the volute cone hopper. The set temperature is between the temperature of the slurry flowing in the slurry pipeline and the normal ambient temperature at the bottom end of the volute cone hopper.

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