Intelligent Condensate Collection and Drainage System with Negative Pressure Liquid Collection and Positive Pressure Backflush and Application Method

Abstract

The present invention provides an intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backflush and an application method. Aiming at problems such as easy accumulation of condensate in equipment and pipelines during the purification process of industrial waste gas, difficult drainage, increased corrosion, and low operation and maintenance efficiency of manual liquid drainage, by constructing a "negative pressure liquid collection - positive pressure backflush" dynamic circulation system and utilizing the pressure difference generated by the operation of the fan, automatic and efficient collection of the accumulated liquid in the system and sealed and controllable drainage are realized, solving the technical problem of siphon blockage in traditional gravity drainage under negative pressure environment; at the same time, by precisely controlling the retention time of the accumulated liquid, equipment corrosion and the increase of system energy consumption are inhibited; the present invention integrates liquid level and pressure monitoring and multi-parameter collaborative control algorithms, automatically adjusts the discharge frequency to dynamically adapt to the waste gas working conditions, replaces manual inspection and liquid drainage, and improves the intelligent level of system operation and maintenance; in addition, the system adopts a fully enclosed discharge structure and corrosion-resistant materials to avoid the escape of pollutants during the liquid drainage process.

Description

Technical Field

[0001] The present invention relates to the technical field of condensate collection and discharge, and particularly to an intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backwashing and its application method. Background Art

[0002] In the industrial production process, the waste gas treatment system is a core facility to ensure environmental safety and production compliance. Especially in highly polluting industries such as chemical, pharmaceutical, petroleum refining, and spraying, the stable operation of waste gas treatment equipment is directly related to the up - to - standard discharge of pollutants and the sustainable development of enterprises. However, in actual operation, the problems of frequent liquid accumulation or condensate retention inside the waste gas treatment pipelines and equipment are prominent. This problem is particularly obvious in processes such as combustion methods (RTO / RCO), chemical spray washing (such as alkali washing towers, acid mist absorption towers), and wet electrostatic precipitators. Such processes generate a large amount of water vapor during the reaction or need to cool down through spraying, resulting in a significant increase in the humidity of the waste gas. When the waste gas with high humidity flows through low - temperature pipelines or equipment, it is extremely easy to form condensate on the wall surface.

[0003] Condensate usually contains acidic substances (such as acid mists formed by SO3, NOx dissolved in water), organic pollutants (such as VOCs condensate), or corrosive salts (such as chloride ions). Staying on the inner wall of metal pipelines or equipment for a long time will cause electrochemical corrosion, pitting corrosion, and even stress corrosion cracking. The accumulation of liquid may cause the growth of microorganisms (such as sulfate - reducing bacteria corroding pipelines) or form flammable mixed gases (such as the volatilization of organic solvent condensate). More seriously, the liquid accumulated in the negative pressure section may be carried by the air flow to form a "water hammer" phenomenon, impacting the fan impeller and causing mechanical damage. Traditional solutions rely on manual drainage at regular intervals, but operators need to frequently enter dangerous operation areas, and it is difficult to accurately control the drainage timing, resulting in relatively high difficulty in the actual maintenance process.

[0004] Currently, the industry generally uses gravity drainage pipes or manual drainage valves to deal with the problem of liquid accumulation, but there are significant defects in actual applications: ① Liquid drainage failure in the negative pressure area: There is usually a certain negative pressure environment at the front end of the waste gas delivery fan. Conventional drainage devices cannot achieve self - flowing drainage due to the internal and external pressure difference. Even if a condensate drain pipe is added, the drainage is often incomplete or gas leakage occurs due to the siphon effect. ② Lack of intelligent control: Existing automatic drainage valves mostly rely on mechanical triggering or timed discharge and cannot dynamically respond to system pressure changes. When the waste gas flow fluctuates, problems such as false triggering (incomplete drainage) or delayed drainage (too high liquid level) are likely to occur. ③ Risk of secondary pollution: The open - type drainage design may cause harmful liquid dripping or volatile pollutant escape. In view of the above pain points, there is an urgent need to develop an intelligent liquid collection and drainage device that is highly coupled with the waste gas treatment system. Summary of the Invention

[0005] The object of the present invention is to provide an intelligent liquid accumulation collection and discharge device for an industrial waste gas treatment system, realizing automatic collection, automatic discharge and safety control of liquid accumulation in the negative pressure area and the positive pressure area, and effectively preventing problems such as drainage failure and secondary pollution, namely an intelligent condensate collection and discharge system based on negative pressure liquid collection and positive pressure backwashing technology and its application method.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An intelligent condensate collection and discharge system with negative pressure liquid collection and positive pressure backwashing, comprising an exhaust gas conveying fan, an exhaust gas purification device, a liquid accumulation buffer tank and an automatic control system;

[0008] The inlet end of the exhaust gas conveying fan is connected to an external exhaust gas source through a negative pressure exhaust gas main pipe in front of the fan, and the outlet end of the exhaust gas conveying fan is connected to the exhaust gas purification device through a positive pressure exhaust gas main pipe behind the fan, for purifying and discharging the exhaust gas after treatment;

[0009] The liquid accumulation buffer tank is respectively connected to the negative pressure liquid collection pipe and the positive pressure liquid collection pipe on the drainage pipes arranged at the lowest points of the negative pressure exhaust gas main pipe in front of the fan, the exhaust gas purification device and the positive pressure exhaust gas main pipe behind the fan, collects condensate or liquid accumulation through the pressure difference, and discharges the liquid accumulation through the waste liquid discharge pipe to ensure the normal operation of the pipeline and equipment;

[0010] The liquid accumulation buffer tank is respectively connected to the negative pressure exhaust gas main pipe in front of the fan and the positive pressure exhaust gas main pipe behind the fan through a negative pressure balance pipe and a positive pressure balance pipe. Through the cooperation of the negative pressure balance pipe and the positive pressure balance pipe, it is ensured to collect condensate or liquid accumulation in the negative pressure mode and discharge condensate or liquid accumulation in the positive pressure mode, avoiding liquid accumulation or blockage;

[0011] Valves are respectively arranged on the negative pressure balance pipe, the positive pressure balance pipe, the negative pressure liquid collection pipe, the positive pressure liquid collection pipe and the waste liquid discharge pipe;

[0012] A liquid level sensor is arranged in the liquid accumulation buffer tank. The liquid level sensor is used to detect the liquid level in the liquid accumulation buffer tank and feed back the liquid level signal to the automatic control system. The automatic control system controls the opening and closing of each valve based on the signal to realize automatic discharge control of the liquid accumulation.

[0013] Preferably, a vacuum pump is further included. One end of the vacuum pump is connected to the liquid accumulation buffer tank, and the other end of the liquid accumulation buffer tank is communicated with the negative pressure exhaust gas main pipe in front of the fan through a vacuum pump pipeline with a vacuum pump pipeline cut-off valve;

[0014] A pressure sensor is provided inside the liquid accumulation buffer tank. The pressure sensor is connected to an automatic control system, which is used to monitor the pressure change inside the liquid accumulation buffer tank and feed it back to the automatic control system in real time, so as to automatically adjust the working state of the vacuum pump according to the preset pressure value and ensure that the system pressure is within a reasonable range.

[0015] Preferably, an automatic cut-off valve is provided on the negative pressure balance pipe, an automatic cut-off valve is provided on the positive pressure balance pipe, a cut-off valve is provided on the negative pressure liquid accumulation collection pipe, a cut-off valve is provided on the positive pressure liquid accumulation collection pipe, and an automatic drain valve is provided on the waste liquid discharge pipe;

[0016] The automatic control system controls the opening and closing of the positive pressure balance pipe automatic cut-off valve, the negative pressure liquid accumulation collection pipe cut-off valve, the positive pressure liquid accumulation collection pipe cut-off valve, the automatic drain valve, the vacuum pump pipeline cut-off valve and the vacuum pump, so as to realize the automatic discharge control of the liquid accumulation.

[0017] Preferably, the exhaust gas delivery fan, the exhaust gas purification equipment, the liquid accumulation buffer tank and the vacuum pump are defined as the equipment inside the system, and the negative pressure exhaust gas main pipe in front of the fan, the positive pressure exhaust gas main pipe behind the fan, the negative pressure balance pipe, the positive pressure balance pipe, the negative pressure liquid accumulation collection pipe, the positive pressure liquid accumulation collection pipe, the waste liquid discharge pipe, the vacuum pump pipeline and the breathing pipeline are defined as the pipelines;

[0018] The lowest position of the negative pressure exhaust gas main pipe in front of the fan is connected to the negative pressure liquid accumulation collection pipe through a drain pipe; the lowest position of the exhaust gas purification equipment is connected to the positive pressure liquid accumulation collection pipe through another drain pipe; the connection position of the negative pressure balance pipe and the negative pressure exhaust gas main pipe in front of the fan is close to the exhaust gas delivery fan.

[0019] Preferably, a tank top breathing pipe is provided at the top of the liquid accumulation buffer tank. One end of the tank top breathing pipe is connected to the liquid accumulation buffer tank, and the other end is an open end. A sleeve pipe is provided at the upper part of the open end. The sleeve pipe is connected to the negative pressure exhaust gas main pipe in front of the fan through a breathing pipeline, which is used for collecting the breathing gas during the rising process of the liquid level in the liquid accumulation buffer tank; a breathing regulating valve with adjustable opening is provided on the breathing pipeline;

[0020] The gap between the inner wall of the sleeve pipe and the outer wall of the tank top breathing pipe is set to be 5-30 mm, the overlapping length of the sleeve pipe and the tank top breathing pipe is set to be 100-300 mm, and the gap between the inner wall of the sleeve pipe and the outer wall of the tank top breathing pipe forms a cross-sectional layer for connecting air. The suction wind speed of the cross-sectional layer is controlled at 2-4 m / s by adjusting the opening of the breathing regulating valve.

[0021] The present invention also provides an application method of an intelligent condensate collection and discharge system based on negative pressure liquid collection and positive pressure backwashing technology. An automatic control system is set to include a negative pressure liquid collection mode and a positive pressure backwashing mode;

[0022] When the automatic control system is set to the negative pressure liquid collection mode: The waste gas is conveyed through a pipeline by a waste gas conveying fan to a waste gas purification device for purification treatment and then discharged; The pneumatic cut-off valves of the positive pressure balance pipe, the automatic drain valve, and the vacuum pump pipeline cut-off valve are controlled to remain closed, the vacuum pump is closed, and the pneumatic cut-off valves of the negative pressure balance pipe, the negative pressure liquid accumulation collection pipe cut-off valve, and the positive pressure liquid accumulation collection pipe cut-off valve are opened, and the liquid accumulation in the pipeline and equipment is automatically collected into the liquid accumulation buffer tank through the pressure difference;

[0023] When the automatic control system is set to the positive pressure backwashing mode: The waste gas conveying fan and the waste gas purification device keep running normally. First, the pneumatic cut-off valves of the negative pressure balance pipe, the negative pressure liquid accumulation collection pipe cut-off valve, and the positive pressure liquid accumulation collection pipe cut-off valve are closed, then the pneumatic cut-off valve of the positive pressure balance pipe is opened, and then the automatic drain valve is opened. The vacuum pump and the vacuum pump pipeline cut-off valve remain closed. Through this mode, the waste liquid in the liquid accumulation buffer tank is emptied by positive pressure backwashing;

[0024] The valves adopted for the pneumatic cut-off valves of the negative pressure balance pipe and the positive pressure balance pipe are pneumatic cut-off valves, driven by a linear cylinder, and the leakage rate is lower than 1%.

[0025] Preferably, the switching method between the negative pressure liquid collection mode and the positive pressure backwashing mode is as follows:

[0026] The switching conditions for the automatic control system to switch from the negative pressure liquid collection mode to the positive pressure backwashing mode include any one of the following being satisfied: The value of the liquid level sensor rises to the corresponding set value or the negative pressure liquid collection mode reaches the set cumulative time;

[0027] The switching conditions for the automatic control system to switch from the positive pressure backwashing mode to the negative pressure liquid collection mode include both of the following being satisfied: The value of the liquid level sensor drops to the corresponding set value and the positive pressure backwashing mode reaches the set cumulative time.

[0028] Preferably, in the switching conditions from the positive pressure backwashing mode to the negative pressure liquid collection mode, the cumulative time of the positive pressure backwashing mode is set to 3 - 10 minutes.

[0029] Preferably, the automatic control system is provided with negative pressure enhancement control. When the automatic control system monitors that the value of the pressure sensor is higher than the set value A and is in the liquid accumulation negative pressure collection mode at this time, the automatic control system turns on the vacuum pump and the vacuum pump pipeline cut-off valve. When the automatic control system monitors that the value of the pressure sensor is lower than the set value B or is in the positive pressure backwashing mode, the automatic control system turns off the vacuum pump and the vacuum pump pipeline cut-off valve.

[0030] Preferably, the set value A is -6000~-3000Pa, and the set value B is 1000~3000Pa lower than the set value A.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The intelligent condensate collection and drainage system of the negative pressure liquid collection and positive pressure recoil of the present invention can realize the negative pressure efficient liquid collection and positive pressure sealed discharge of the accumulated liquid in the pipes and equipment in the exhaust gas purification system. The pipe in front of the fan is a negative pressure area, and the pipe behind the fan is a positive pressure area, which are used for collecting and draining liquid respectively. The pressure difference generated by the operation of the exhaust gas conveying fan is used to construct a "negative pressure liquid collection-positive pressure recoil" dynamic circulation system. Under normal circumstances, the accumulated liquid can be automatically collected and controlled to be discharged without external power, solving the siphon blockage problem of conventional gravity drainage in a negative pressure environment. In the case where the negative pressure in the liquid accumulation tank is insufficient due to the low operating load of the fan, the system can start the negative pressure enhancement control to ensure the timely emptying of the accumulated liquid in the pipes and equipment.

[0033] The present invention discloses a negative pressure liquid collection and positive pressure recoil intelligent condensate collection and drainage system, which inhibits equipment corrosion and increased energy consumption. It prevents acidic condensate from contacting metal walls for a long time by precisely controlling the accumulated liquid residence time, effectively improves equipment and pipeline corrosion problems, and reduces pressure loss caused by pipeline accumulation, thereby avoiding increased system fan energy consumption caused by this.

[0034] The present invention discloses a negative pressure liquid collection and positive pressure recoil intelligent condensate collection and drainage system, which constructs an intelligent control system, integrates liquid level sensing and pressure feedback modules, develops a multi-parameter collaborative control algorithm, automatically adjusts the emission frequency and dynamically adapts to the exhaust gas operating conditions, replaces manual inspection and drainage, and improves operation and maintenance efficiency.

[0035] The present invention discloses a negative pressure liquid collection-positive pressure recoil intelligent condensate collection and drainage system, in which pipelines and equipment are connected in a closed or semi-closed manner, thereby preventing the unorganized escape of toxic and harmful gases and liquid dripping during the drainage process, and meeting the requirements of national laws and regulations on the control of unorganized exhaust gas emissions. At the same time, the collected high-concentration condensate can be directed to the wastewater treatment unit, meeting the requirements for the standardized collection and disposal of various pollutants.

[0036] In summary, the present invention provides a condensate intelligent collection and drainage system with negative pressure liquid collection - positive pressure backflush and an application method. Aiming at the problems of easy accumulation of condensate in equipment and pipelines during the industrial waste gas purification process, difficult drainage, increased corrosion, and low operation and maintenance efficiency of manual liquid drainage, by constructing a "negative pressure liquid collection - positive pressure backflush" dynamic circulation system and utilizing the pressure difference generated by the operation of the fan, automatic and efficient collection of the accumulated liquid in the system and sealed and controllable drainage are realized, solving the technical problem of siphon blockage in traditional gravity drainage in a negative pressure environment; at the same time, by precisely controlling the retention time of the accumulated liquid, equipment corrosion and the increase of system energy consumption are inhibited; the present invention integrates liquid level, pressure monitoring and multi-parameter collaborative control algorithms, automatically adjusts the drainage frequency to dynamically adapt to the waste gas working conditions, replaces manual inspection and liquid drainage, and improves the intelligent level of system operation and maintenance; in addition, the system adopts a fully enclosed drainage structure and corrosion-resistant materials to avoid the escape of pollutants during the liquid drainage process, meets the national waste gas emission control standards, and the collected high-concentration condensate can be directionally transported to the wastewater treatment unit to meet the compliance collection and disposal requirements of various pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 FIG. is a schematic structural diagram of a condensate intelligent collection and drainage system with negative pressure liquid collection - positive pressure backflush provided by an embodiment of the present invention.

[0038] The serial numbers in the figure are as follows:

[0039] 1-1, negative pressure waste gas main pipe in front of the fan; 1-2, positive pressure waste gas main pipe behind the fan; 1-3, negative pressure balance pipe; 1-4 positive pressure balance pipe; 1-5, negative pressure accumulated liquid collection pipe; 1-6, positive pressure accumulated liquid collection pipe; 1-7, waste liquid discharge pipe; 1-8, vacuum pump pipeline; 1-9, breathing pipeline; 1-9-1 sleeve pipe; 1-10, tank top breathing pipe; 2-1, waste gas conveying fan; 3-1, waste gas purification equipment; 3-2, accumulated liquid buffer tank; 3-3, vacuum pump; 4-1, automatic cut-off valve for negative pressure balance pipe; 4-2, automatic cut-off valve for positive pressure balance pipe; 4-3, cut-off valve for negative pressure accumulated liquid collection pipe; 4-4, cut-off valve for positive pressure accumulated liquid collection pipe; 4-5, automatic drain valve; 4-6, cut-off valve for vacuum pump pipeline; 4-7, breathing regulating valve; 5-1, liquid level sensor; 5-2, pressure sensor; 6-1, automatic control system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0041] As Figure 1As shown in the figure, this is an intelligent condensate collection and drainage system with negative pressure liquid collection and positive pressure backwashing provided in this embodiment, which includes an exhaust gas delivery fan 2-1, an exhaust gas purification device 3-1, a liquid accumulation buffer tank 3-2, a vacuum pump 3-3, and an automatic control system 6-1.

[0042] The inlet end of the exhaust gas delivery fan 2-1 is connected to an external exhaust gas source through a negative pressure exhaust gas main pipe 1-1 in front of the fan, and the outlet end of the exhaust gas delivery fan 2-1 is connected to the exhaust gas purification device 3-1 through a positive pressure exhaust gas main pipe 1-2 behind the fan, for purifying and discharging the exhaust gas.

[0043] The liquid accumulation buffer tank 3-2 is connected to a drainage pipeline set at the lowest point of the negative pressure exhaust gas main pipe 1-1 in front of the fan through a negative pressure liquid collection pipe 1-5, and collects condensate or accumulated liquid through negative pressure to ensure the normal operation of the pipeline and equipment.

[0044] The liquid accumulation buffer tank 3-2 is connected to a drainage pipeline set at the lowest point between the exhaust gas purification device 3-1 and the positive pressure exhaust gas main pipe 1-2 behind the fan through a positive pressure liquid collection pipe 1-6, and discharges the accumulated liquid through a waste liquid discharge pipe 1-7; preventing its accumulation and affecting the system operation.

[0045] The negative pressure liquid collection pipe 1-5 and the positive pressure liquid collection pipe 1-6 are respectively connected to the corresponding negative pressure area and positive pressure area before and after the exhaust gas delivery fan 2-1, and utilize the pressure difference formed during the operation of the exhaust gas delivery fan 2-1 to realize the automatic collection and discharge of the accumulated liquid.

[0046] The liquid accumulation buffer tank 3-2 is connected to the negative pressure exhaust gas main pipe 1-1 in front of the fan and the positive pressure exhaust gas main pipe 1-2 behind the fan through a negative pressure balance pipe 1-3 and a positive pressure balance pipe 1-4 respectively. Through the cooperation of the negative pressure balance pipe 1-3 and the positive pressure balance pipe 1-4, it ensures the collection of condensate or accumulated liquid in the negative pressure mode and the discharge of condensate or accumulated liquid in the positive pressure mode, avoiding liquid accumulation or blockage.

[0047] A negative pressure balance pipe automatic cut-off valve 4-1 is provided on the negative pressure balance pipe 1-3, a positive pressure balance pipe automatic cut-off valve 4-2 is provided on the positive pressure balance pipe 1-4, a negative pressure liquid collection pipe cut-off valve 4-3 is provided on the negative pressure liquid collection pipe 1-5, a positive pressure liquid collection pipe cut-off valve 4-4 is provided on the positive pressure liquid collection pipe 1-6, and an automatic drain valve 4-5 is provided on the waste liquid discharge pipe 1-7;

[0048] The automatic control system 6-1 controls the opening and closing of the positive pressure balance pipe automatic cut-off valve 4-2, the negative pressure liquid collection pipe cut-off valve 4-3, the positive pressure liquid collection pipe cut-off valve 4-4, the automatic drain valve 4-5, the vacuum pump pipeline cut-off valve 4-6, and the vacuum pump 3-3, to realize the automatic discharge control of the accumulated liquid.

[0049] A liquid accumulation buffer tank 3-2 is provided with a liquid level sensor 5-1. The liquid level sensor 5-1 is used to detect the liquid level in the liquid accumulation buffer tank 3-2 and feed back the liquid level signal to the automatic control system 6-1. The automatic control system 6-1 controls the opening and closing of each valve based on the signal to achieve automatic discharge control of the liquid accumulation.

[0050] One end of a vacuum pump 3-3 is connected to the liquid accumulation buffer tank 3-2. The other end of the liquid accumulation buffer tank 3-2 is communicated with the main negative pressure exhaust gas pipe 1-1 in front of the fan through a vacuum pump pipeline 1-8 with a vacuum pump pipeline cut-off valve 4-6.

[0051] The liquid accumulation buffer tank 3-2 is provided with a pressure sensor 5-2. The pressure sensor 5-2 is connected to the automatic control system 6-1, used to monitor the pressure change in the liquid accumulation buffer tank 3-2 and feed it back to the automatic control system 6-1 in real time, so as to automatically adjust the working state of the vacuum pump 3-3 according to the preset pressure value to ensure that the system pressure is within a reasonable range.

[0052] Furthermore, in this embodiment, the exhaust gas delivery fan 2-1, the exhaust gas purification device 3-1, the liquid accumulation buffer tank 3-2 and the vacuum pump 3-3 are defined as the equipment inside the system, and the main negative pressure exhaust gas pipe 1-1 in front of the fan, the main positive pressure exhaust gas pipe 1-2 behind the fan, the negative pressure balance pipe 1-3, the positive pressure balance pipe 1-4, the negative pressure liquid accumulation collection pipe 1-5, the positive pressure liquid accumulation collection pipe 1-6, the waste liquid discharge pipe 1-7 and the vacuum pump pipeline 1-8 are defined as pipelines. The lowest position of the main negative pressure exhaust gas pipe 1-1 in front of the fan is connected to the negative pressure liquid accumulation collection pipe 1-5 through a drainage pipeline; the lowest position of the exhaust gas purification device 3-1 is connected to the positive pressure liquid accumulation collection pipe 1-6 through another drainage pipeline; the connection position of the negative pressure balance pipe 1-3 and the main negative pressure exhaust gas pipe 1-1 is close to the exhaust gas delivery fan 2-1. The function is that the closer to the exhaust gas delivery fan 2-1, the greater the negative pressure, so that the liquid accumulation buffer tank 3-2 can achieve the maximum negative pressure, and drain the liquid through the pressure difference to avoid the problem of poor drainage of the negative pressure liquid accumulation collection pipe 1-5.

[0053] Furthermore, a tank top breather pipe 1-10 is provided at the top of the liquid accumulation buffer tank 3-2. One end of the tank top breather pipe 1-10 is communicated with the liquid accumulation buffer tank 3-2, and the other end is an open end. An adapter pipe 1-9-1 is provided above the open end. The adapter pipe 1-9-1 is communicated with the main negative pressure exhaust gas pipe 1-1 through a breather pipeline 1-9, used for collecting the breathing gas during the rising process of the liquid level in the liquid accumulation buffer tank 3-2; a breathing regulating valve 4-7 with adjustable opening is provided on the breather pipeline 1-9.

[0054] The gap between the inner wall of the sleeve pipe 1-9-1 and the outer wall of the tank top breather pipe 1-10 is set to 5~30 mm, and the overlapping length of the sleeve pipe 1-9-1 and the tank top breather pipe 1-10 is set to 100~300 mm. The gap between the inner wall of the sleeve pipe 1-9-1 and the outer wall of the tank top breather pipe 1-10 forms a cross-sectional layer for air communication, and the suction air velocity of the cross-sectional layer is controlled at 2~4 m / s by adjusting the opening degree of the breathing regulating valve 4-7.

[0055] This embodiment provides an application method for the condensate intelligent collection and drainage system based on negative pressure liquid collection - positive pressure backwashing. The automatic control system 6-1 includes a negative pressure liquid collection mode and a positive pressure backwashing mode;

[0056] When the automatic control system 6-1 is set to the negative pressure liquid collection mode: The waste gas is transported through the pipeline by the waste gas delivery fan 2-1 to the waste gas purification equipment 3-1 for purification treatment and then discharged; The automatic cut-off valve 4-2 for the internal positive pressure balance pipe, the automatic drain valve 4-5, and the vacuum pump pipeline cut-off valve 4-6 are controlled to remain closed, the vacuum pump 3-3 is closed, the automatic cut-off valve 4-1 for the negative pressure balance pipe, the cut-off valve 4-3 for the negative pressure liquid collection pipe, and the cut-off valve 4-4 for the positive pressure liquid collection pipe are opened, and the liquid in the pipeline and equipment is automatically collected into the liquid accumulation buffer tank 3-2 through the pressure difference;

[0057] When the automatic control system 6-1 is set to the positive pressure backwashing mode: The waste gas delivery fan 2-1 and the waste gas purification equipment 3-1 keep running normally. First, the automatic cut-off valve 4-1 for the negative pressure balance pipe, the cut-off valve 4-3 for the negative pressure liquid collection pipe, and the cut-off valve 4-4 for the positive pressure liquid collection pipe are closed, then the automatic cut-off valve 4-2 for the positive pressure balance pipe is opened, and then the automatic drain valve 4-5 is opened. The vacuum pump 3-3 and the vacuum pump pipeline cut-off valve 4-6 remain closed. Through this mode, the waste liquid in the liquid accumulation buffer tank 3-2 is emptied by positive pressure backwashing.

[0058] The valves used for the automatic cut-off valve 4-1 for the negative pressure balance pipe and the automatic cut-off valve 4-2 for the positive pressure balance pipe are pneumatic cut-off valves, driven by a linear cylinder, with a leakage rate lower than 1%. The gas flow components such as the valve plate and valve seat are made of corrosion-resistant materials or are equipped with corrosion-resistant coatings.

[0059] The switching method between the negative pressure liquid collection mode and the positive pressure backwashing mode is as follows:

[0060] The switching conditions for the automatic control system 6-1 to switch from the negative pressure liquid collection mode to the positive pressure backwashing mode include any one of the following being satisfied: The value of the liquid level sensor 5-1 increases and reaches the corresponding set value, or the negative pressure liquid collection mode reaches the set cumulative time;

[0061] The switching conditions for the automatic control system 6-1 to control the switching from the positive-pressure backwashing mode to the negative-pressure liquid collection mode include simultaneously satisfying: the value of the liquid level sensor 5-1 decreases and reaches the corresponding set value, and the positive-pressure backwashing mode reaches the set cumulative time. In the switching conditions from the positive-pressure backwashing mode to the negative-pressure liquid collection mode, the cumulative time of the positive-pressure backwashing mode is set to 3-10 minutes.

[0062] In addition, the automatic control system 6-1 is also provided with negative-pressure enhancement control. When the automatic control system 6-1 monitors that the value of the pressure sensor 5-2 is higher than the set value A and is in the liquid accumulation negative-pressure collection mode at this time, the automatic control system 6-1 turns on the vacuum pump 3-3 and the vacuum pump pipeline cut-off valve 4-6. When the automatic control system 6-1 monitors that the value of the pressure sensor 5-2 is lower than the set value B, the automatic control system 6-1 turns off the vacuum pump 3-3 and the vacuum pump pipeline cut-off valve 4-6.

[0063] Among them, the set value A ranges from -6000 to -3000 Pa, and the set value B is 1000 to 3000 Pa lower than the set value A.

[0064] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0065] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A condensate intelligent collection and drainage system with negative pressure liquid collection - positive pressure backwashing, characterized in that, It includes an exhaust gas delivery fan (2-1), an exhaust gas purification device (3-1), a liquid accumulation buffer tank (3-2), and an automatic control system (6-1); The inlet end of the exhaust gas delivery fan (2-1) is connected to an external exhaust gas source through a negative pressure exhaust gas main pipe (1-1) in front of the fan, and the outlet end of the exhaust gas delivery fan (2-1) is connected to the exhaust gas purification device (3-1) through a positive pressure exhaust gas main pipe (1-2) behind the fan, for purifying and discharging the exhaust gas; The liquid accumulation buffer tank (3-2) is respectively connected to the drain pipes arranged at the lowest points of the negative pressure exhaust gas main pipe (1-1) in front of the fan, the exhaust gas purification device (3-1), and the positive pressure exhaust gas main pipe (1-2) behind the fan through a negative pressure liquid accumulation collection pipe (1-5) and a positive pressure liquid accumulation collection pipe (1-6), collects condensate or accumulated liquid through the pressure difference, and discharges the accumulated liquid through a waste liquid discharge pipe (1-7) to ensure the normal operation of the pipeline and equipment; The liquid accumulation buffer tank (3-2) is respectively connected to the negative pressure exhaust gas main pipe (1-1) in front of the fan and the positive pressure exhaust gas main pipe (1-2) behind the fan through a negative pressure balance pipe (1-3) and a positive pressure balance pipe (1-4). Through the cooperation of the negative pressure balance pipe (1-3) and the positive pressure balance pipe (1-4), it ensures the collection of condensate or accumulated liquid in the negative pressure mode and the discharge of condensate or accumulated liquid in the positive pressure mode, avoiding liquid accumulation or blockage; Valves are respectively provided on the negative pressure balance pipe (1-3), the positive pressure balance pipe (1-4), the negative pressure liquid accumulation collection pipe (1-5), the positive pressure liquid accumulation collection pipe (1-6), and the waste liquid discharge pipe (1-7); A liquid level sensor (5-1) is provided in the liquid accumulation buffer tank (3-2). The liquid level sensor (5-1) is used to detect the liquid level in the liquid accumulation buffer tank (3-2) and feed back the liquid level signal to the automatic control system (6-1). The automatic control system (6-1) controls the opening and closing of each valve based on the signal to realize the automatic discharge control of the accumulated liquid.

2. The intelligent condensate liquid collection and drainage system with negative pressure liquid collection - positive pressure backwashing according to claim 1, characterized in that It also includes a vacuum pump (3-3). One end of the vacuum pump (3-3) is connected to the liquid accumulation buffer tank (3-2), and the other end of the liquid accumulation buffer tank (3-2) is communicated with the negative pressure exhaust gas main pipe (1-1) in front of the fan through a vacuum pump pipeline (1-8) with a vacuum pump pipeline cut-off valve (4-6); A pressure sensor (5-2) is provided in the liquid accumulation buffer tank (3-2). The pressure sensor (5-2) is connected to the automatic control system (6-1), used to monitor the pressure change in the liquid accumulation buffer tank (3-2) and feedback it to the automatic control system (6-1) in real time, so as to automatically adjust the working state of the vacuum pump (3-3) according to the preset pressure value to ensure that the system pressure is within a reasonable range.

3. The intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backwashing according to claim 2, characterized in that, A negative pressure balance pipe automatic cut-off valve (4-1) is provided on the negative pressure balance pipe (1-3), a positive pressure balance pipe automatic cut-off valve (4-2) is provided on the positive pressure balance pipe (1-4), a negative pressure liquid accumulation collection pipe cut-off valve (4-3) is provided on the negative pressure liquid accumulation collection pipe (1-5), a positive pressure liquid accumulation collection pipe cut-off valve (4-4) is provided on the positive pressure liquid accumulation collection pipe (1-6), and an automatic drain valve (4-5) is provided on the waste liquid discharge pipe (1-7). The automatic control system (6-1) controls the opening and closing of the positive pressure balance pipe automatic cut-off valve (4-2), the negative pressure liquid accumulation collection pipe cut-off valve (4-3), the positive pressure liquid accumulation collection pipe cut-off valve (4-4), the automatic drain valve (4-5), the vacuum pump pipeline cut-off valve (4-6) and the vacuum pump (3-3) to achieve automatic discharge control of the accumulated liquid.

4. The intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backflush according to claim 1, characterized in that The exhaust gas delivery fan (2-1), the exhaust gas purification equipment (3-1), the liquid accumulation buffer tank (3-2) and the vacuum pump (3-3) are defined as the equipment inside the system, and the negative pressure exhaust gas main pipe in front of the fan (1-1), the positive pressure exhaust gas main pipe behind the fan (1-2), the negative pressure balance pipe (1-3), the positive pressure balance pipe (1-4), the negative pressure liquid accumulation collection pipe (1-5), the positive pressure liquid accumulation collection pipe (1-6), the waste liquid discharge pipe (1-7), the vacuum pump pipeline (1-8) and the breathing pipeline (1-9) are defined as the pipelines. The lowest position of the negative pressure exhaust gas main pipe in front of the fan (1-1) is connected to the negative pressure liquid accumulation collection pipe (1-5) through a liquid discharge pipeline; the lowest position of the exhaust gas purification equipment (3-1) is connected to the positive pressure liquid accumulation collection pipe (1-6) through another liquid discharge pipeline; the connection position of the negative pressure balance pipe (1-3) and the negative pressure exhaust gas main pipe in front of the fan (1-1) is close to the air suction inlet of the exhaust gas delivery fan (2-1).

5. An intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backwashing, according to claim 1, characterized in that, A tank top breathing pipe (1-10) is provided at the top of the liquid accumulation buffer tank (3-2). One end of the tank top breathing pipe (1-10) is connected to the liquid accumulation buffer tank (3-2), and the other end is an open end. A sleeve pipe (1-9-1) is provided at the upper part of the open end. The sleeve pipe (1-9-1) is connected to the negative pressure exhaust gas main pipe in front of the fan (1-1) through the breathing pipeline (1-9) for collecting the breathing gas during the rising process of the liquid level in the liquid accumulation buffer tank (3-2); a breathing regulating valve (4-7) with adjustable opening is provided on the breathing pipeline (1-9). The gap between the inner wall of the sleeve pipe (1-9-1) and the outer wall of the tank top breathing pipe (1-10) is set to 5 - 30 mm, the overlapping length of the sleeve pipe (1-9-1) and the tank top breathing pipe (1-10) is set to 100 - 300 mm, and the gap between the inner wall of the sleeve pipe (1-9-1) and the outer wall of the tank top breathing pipe (1-10) forms a cross-sectional layer for connecting air. The suction air velocity of the cross-sectional layer is controlled at 2 - 4 m / s by adjusting the opening of the breathing regulating valve (4-7).

6. An application method of the intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backwashing according to any one of claims 1 - 5, characterized in that, The automatic control system (6-1) is set to include a negative pressure liquid collection mode and a positive pressure backwashing mode. When the automatic control system (6-1) is set to the negative pressure liquid collection mode: The waste gas is transported through the pipeline by the waste gas transport fan (2-1) to the waste gas purification equipment (3-1) for purification treatment and then discharged; the positive pressure balance pipe automatic cut-off valve (4-2), the automatic drain valve (4-5) and the vacuum pump pipeline cut-off valve (4-6) are controlled to remain closed, the vacuum pump (3-3) is closed, the negative pressure balance pipe automatic cut-off valve (4-1), the negative pressure liquid accumulation collection pipe cut-off valve (4-3) and the positive pressure liquid accumulation collection pipe cut-off valve (4-4) are opened, and the liquid accumulation in the pipeline and equipment is automatically collected into the liquid accumulation buffer tank (3-2) through the pressure difference. When the automatic control system (6-1) is set to the positive pressure backflushing mode: The waste gas transport fan (2-1) and the waste gas purification equipment (3-1) remain in normal operation. First, the negative pressure balance pipe automatic cut-off valve (4-1), the negative pressure liquid accumulation collection pipe cut-off valve (4-3) and the positive pressure liquid accumulation collection pipe cut-off valve (4-4) are closed, then the positive pressure balance pipe automatic cut-off valve (4-2) is opened, and then the automatic drain valve (4-5) is opened. The vacuum pump (3-3) and the vacuum pump pipeline cut-off valve (4-6) remain closed. Through this mode, the waste liquid in the liquid accumulation buffer tank (3-2) is emptied by positive pressure backflushing. The valves used for the negative pressure balance pipe automatic cut-off valve (4-1) and the positive pressure balance pipe automatic cut-off valve (4-2) are pneumatic cut-off valves, driven by a linear cylinder, and the leakage rate is lower than 1%.

7. The application method of an intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backflush according to claim 6, characterized in that, The switching method between the negative pressure liquid collection mode and the positive pressure backflushing mode is as follows: The switching conditions for the automatic control system (6-1) to control the negative pressure liquid collection mode to the positive pressure backflushing mode include any one of the following being satisfied: the value of the liquid level sensor (5-1) rises to the corresponding set value or the negative pressure liquid collection mode reaches the set cumulative time. The switching conditions for the automatic control system (6-1) to control the positive pressure backflushing mode to the negative pressure liquid collection mode include both of the following being satisfied: the value of the liquid level sensor (5-1) drops to the corresponding set value and the positive pressure backflushing mode reaches the set cumulative time.

8. The application method of an intelligent condensate collection and drainage system with negative pressure liquid collection - positive pressure backflush according to claim 6, characterized in that, In the switching conditions for the positive pressure backflushing mode to the negative pressure liquid collection mode, the cumulative time of the positive pressure backflushing mode is set to 3 - 10 minutes.

9. The application method of a condensate intelligent collection and drainage system with negative pressure liquid collection - positive pressure backflush according to claim 6, characterized in that, The automatic control system (6-1) is provided with negative pressure enhancement control. When the automatic control system (6-1) monitors that the value of the pressure sensor (5-2) is higher than the set value A and is in the liquid accumulation negative pressure collection mode at this time, the automatic control system (6-1) turns on the vacuum pump (3-3) and the vacuum pump pipeline cut-off valve (4-6). When the automatic control system (6-1) monitors that the value of the pressure sensor (5-2) is lower than the set value B or is in the positive pressure backflushing mode, the automatic control system (6-1) turns off the vacuum pump (3-3) and the vacuum pump pipeline cut-off valve (4-6).

10. The application method of a condensate intelligent collection and drainage system with negative pressure liquid collection - positive pressure backflush according to claim 9, characterized in that, The set value A ranges from -6000 to -3000 Pa, and the set value B is 1000 - 3000 Pa lower than the set value A.

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