A condensate treatment device for a pure oxygen combustion heating furnace

Abstract

The present application belongs to the technical field of flue gas condensation, and provides a condensate water treatment device for a pure oxygen combustion heating furnace, which comprises a pure oxygen combustion heating furnace, a heat exchanger, a flue gas discharge device, a first condensate water filter tank, a second condensate water filter tank, a water collecting tank and a controller; the heat exchanger is connected with the pure oxygen combustion heating furnace, the flue gas discharge device and the first condensate water filter tank, and is provided with a first circulating heat exchange pipeline and a second circulating heat exchange pipeline; the first condensate water filter tank and the second condensate water filter tank are connected, the second condensate water filter tank is connected with the water collecting tank, the first condensate water filter tank is provided with a filter screen assembly, and the second condensate water filter tank is provided with a filter membrane assembly and a temperature monitor. The condensate water treatment device provided by the present application collects and treats the condensate water generated in the flue gas condensation process, avoids the backflow and overflow of the condensate water from causing damage and corrosion to the heating furnace and the heat exchanger, has good cooling effect and high efficiency, purifies and recycles the collected condensate water, and improves the resource utilization rate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flue gas condensation, and particularly relates to a condensate water treatment device for a pure oxygen combustion heating furnace. BACKGROUND

[0002] The combustion medium of a conventional combustion heating furnace is air, and a large amount of flue gas is generated during combustion in the furnace, which can carry away a large amount of water vapor, and condensate water is not easily generated when the flue gas is cooled. The main medium of a pure oxygen combustion heating furnace is oxygen and natural gas, and the amount of flue gas is small, about one-eighth to one-tenth of that of a conventional heating furnace, but a large amount of water vapor is contained in the flue gas. According to relevant information and actual tracking measurement, about 1.4-1.7 kg of water is generated per cubic meter of natural gas through a heat exchanger.

[0003] During the process of furnace installation and heating, when the temperature reaches 500 DEG C or higher, a large amount of condensate water with a high temperature is generated when the flue gas discharged from the furnace is cooled through the heat exchanger. If the condensate water is not collected and treated in time, the condensate water is likely to seep out from the bottom of the heat exchanger, thereby causing the valve and the connecting pipeline at the bottom to rust, reducing the service life, causing the bottom of the heat exchanger to be damaged, and the equipment to be damaged. At the same time, with the increase of the amount of condensate water, if the condensate water cannot be discharged in time, the phenomenon of leakage and overflow is likely to occur, which seriously affects the safety production environment, causes safety risks, and even causes the condensate water to flow back into the furnace, which affects the internal structure of the heating furnace, including the wall casting and the refractory material, which are easily cracked and separated after being soaked in water, affecting the normal use of the pure oxygen combustion heating furnace. In addition, the condensate water is likely to flow back into the heating furnace and evaporate in the furnace, which reduces the temperature rising rate in the furnace, increases energy consumption, and increases the production and processing cost.

[0004] Therefore, it is necessary to design a condensate water treatment device which can collect and purify the condensate water and recycle the condensate water, avoid the condensate water from flowing back into the heating furnace, and avoid the condensate water from overflowing to cause the heat exchanger components to rust. SUMMARY

[0005] The present application is to solve the above technical problems, and provides a condensate water treatment device for a pure oxygen combustion heating furnace, which collects and treats the condensate water generated during the flue gas condensation process, effectively avoids the backflow and overflow of the condensate water, avoids the damage and rust of the heating furnace and the heat exchanger, ensures the safety of the production environment, has a good flue gas cooling effect and high efficiency, filters and purifies the collected condensate water, and recycles the condensate water, thereby improving the resource utilization rate.

[0006] The technical scheme of the present application is as follows:

[0007] The application provides a condensate water treatment device for a pure oxygen combustion heating furnace, comprising a pure oxygen combustion heating furnace, a heat exchanger, a flue gas discharge device, a first condensate water filter tank, a second condensate water filter tank, a water collecting tank and a controller.

[0008] The heat exchanger is connected with the pure oxygen combustion heating furnace through a flue gas pipeline, connected with the flue gas discharge device through a flue gas discharge pipeline, and connected with the first condensate water filter tank through a condensate water pipeline.

[0009] The first condensate water filter tank and the second condensate water filter tank are connected through a flow guide pipeline provided with a first pump body, the second condensate water filter tank and the water collecting tank are connected through a drainage pipeline provided with a second pump body, and the second circulating heat exchange pipeline is connected with the second pump body.

[0010] The first condensate water filter tank is provided with a filter screen assembly, the connection position of the first condensate water filter tank and the condensate water pipeline is provided with a first flow meter, the connection position of the first condensate water filter tank and the flow guide pipeline is provided with a second flow meter, and the second condensate water filter tank is provided with a filter membrane assembly and a temperature monitor.

[0011] The first condensate water filter tank and the second condensate water filter tank are provided with a liquid level monitor and a safety valve.

[0012] The first pump body, the second pump body, the first flow meter, the second flow meter, the temperature monitor, the liquid level monitor and the safety valve are connected with the controller.

[0013] Preferably, the tank body of the first condensate water filter tank and the second condensate water filter tank is sequentially provided from inside to outside with a filter accommodating cavity, a cooling medium interlayer and an overflow interlayer; the filter accommodating cavity is used for accommodating condensate water, the cooling medium interlayer is used for accommodating cooling medium and re-cooling the condensate water in the filter accommodating cavity, and the overflow interlayer is used for accommodating overflow condensate water, so as to avoid the increase of pressure in the filter tank due to excessive condensate water, and the occurrence of liquid leakage and overflow.

[0014] The filter accommodating cavity and the overflow interlayer are connected through an overflow port at the top end, and the cooling medium interlayer is separated from the filter accommodating cavity and the overflow interlayer.

[0015] The filter accommodating cavity of the first condensate water filter tank is connected with the condensate water pipeline and the flow guide pipeline, and the filter accommodating cavity of the second condensate water filter tank is connected with the flow guide pipeline and the drainage pipeline.

[0016] Preferably, the overflow interlayer is provided with a drainage port, and the cooling medium interlayer is provided with a third circulating heat exchange pipeline connected with an external water pipe; the drainage port can be connected with an external condensate water collecting device, or the condensate water in the overflow interlayer can be returned and re-filtered through a pipeline provided with a pump body and connected with the condensate water pipeline or the flow guide pipeline.

[0017] Preferably, the condensate water pipeline is provided with a first check valve, and the condensate water can only flow from the heat exchanger to the first condensate water filter tank in one direction.

[0018] The drainage pipeline is provided with a second check valve, and the condensate water can only flow from the second condensate water filter tank to the water collecting tank in one direction.

[0019] The first check valve and the second check valve are connected with the controller.

[0020] Preferably, the second circulating heat exchange pipeline includes a water inlet pipeline and a water return pipeline; the two ends of the water inlet pipeline are respectively connected with the heat exchanger and the second pump body, and the water inlet pipeline is provided with a first control valve; the two ends of the water return pipeline are respectively connected with the heat exchanger and the second condensate water filter tank, and the first control valve is connected with the controller.

[0021] Preferably, the water collecting tank is provided with a third pump body and a fourth circulating heat exchange pipeline connected with each other; the fourth circulating heat exchange pipeline is connected in parallel with the second circulating heat exchange pipeline; and the third pump body is connected with the controller.

[0022] Preferably, the water collecting tank is provided with a float type liquid level instrument.

[0023] Preferably, the safety valve is a pressure relief valve and / or an overflow valve.

[0024] Preferably, the controller is a PLC controller.

[0025] The present invention has the following advantages and effects compared with the prior art:

[0026] (1) By using the first condensate filter tank, the second condensate filter tank and the water collection tank connected in sequence, a large amount of condensate generated by the flue gas passing through the heat exchanger can be collected and treated, which effectively avoids leakage and overflow caused by excessive condensate, and even the situation of returning to the pure oxygen combustion heater. This ensures the normal and efficient operation of the heater and provides a safe production environment. At the same time, it avoids overflow and leakage of condensate at the heat exchanger, thereby avoiding corrosion of heat exchanger components and connecting pipes, and extending the service life of the components.

[0027] (2) The condensate generated by flue gas heat exchange is purified in multiple stages by using a series of filter screen components and filter membrane components to meet the emission standards and avoid environmental pollution. At the same time, the purified condensate can be recycled to improve the utilization rate of resources.

[0028] (3) The flow rate and velocity of the first condensate filter tank are monitored by the first flow meter and the second flow meter. The data obtained are used to understand the clogging of the filter screen assembly, so as to clean and replace the filter screen assembly in a timely and efficient manner and avoid overflow and leakage caused by clogging.

[0029] (4) By adopting the second circulating heat exchange pipe connecting the heat exchanger and the second condensate filter, the condensate after purification and cooling treatment of the second condensate filter can be used to heat exchange and cool the heat exchanger, reducing the demand and consumption of the heat exchanger for external water pipes, and improving the heat exchange effect.

[0030] (5) By adopting control devices, liquid level monitoring devices and safety valves, the liquid level of condensate is automatically monitored, and when the pressure or liquid level in the condensate filter tank is too high, the pressure is automatically released or the condensate is discharged, which reduces labor costs and ensures a safe environment during the production process. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the condensate treatment device for a pure oxygen combustion heating furnace in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the tank body of the first condensate filter tank and the second condensate filter tank in the condensate treatment device for the pure oxygen combustion heating furnace in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the controller connection in the condensate treatment device for a pure oxygen combustion heating furnace in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the condensate treatment device for a pure oxygen combustion heating furnace in Embodiment 2 of the present invention.

[0035] Figure reference numerals: 1-Pure oxygen combustion heater, 11-Flue gas duct, 2-Heat exchanger, 21-Condensate duct, 211-First check valve, 22-First circulating heat exchange duct, 23-Second circulating heat exchange duct, 231-Water inlet duct, 2311-First control valve, 232-Return water duct, 3-Flue gas emission device, 31-Exhaust duct, 4-First condensate filter tank, 41-First pump body, 42-Guide duct, 43-Filter assembly, 44-First flow meter, 45- 5-Second flow meter, 5-Second condensate filter tank, 51-Second pump body, 52-Drain pipe, 521-Second check valve, 53-Filter membrane assembly, 54-Temperature monitor, 6-Water collection tank, 61-Third pump body, 62-Fourth circulating heat exchange pipe, 63-Float-type level gauge, 7-Level monitor, 8-Safety valve, 91-Filter housing, 911-Overflow port, 92-Cooling medium jacket, 921-Third circulating heat exchange pipe, 93-Overflow jacket, 931-Drain outlet. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the present invention will now be further described in conjunction with specific embodiments.

[0037] Example 1:

[0038] like Figures 1-3 As shown, the present invention provides a condensate treatment device for a pure oxygen combustion heating furnace, including a pure oxygen combustion heating furnace 1, a heat exchanger 2, a flue gas emission device 3, a first condensate filter tank 4, a second condensate filter tank 5, a water collection tank 6, and a PLC controller.

[0039] like Figure 1As shown, the heat exchanger 2 is connected with the pure oxygen combustion heating furnace 1 through the flue gas pipeline 11, connected with the flue gas discharge device 3 through the flue gas discharge pipeline 31, and connected with the first condensate water filter tank 4 through the condensate water pipeline 21. The heat exchanger 2 is provided with a first circulating heat exchange pipeline 22 connected with an external water pipe, and a second circulating heat exchange pipeline 23 connected with the second condensate water filter tank 5. The condensate water pipeline 21 is provided with a first check valve 211, and the condensate water can only flow from the heat exchanger 2 to the first condensate water filter tank 4 in one direction. The drain pipeline 52 is provided with a second check valve 521, and the condensate water can only flow from the second condensate water filter tank 5 to the water collecting tank 6 in one direction. The second circulating heat exchange pipeline 23 includes an inlet pipeline 231 and a return pipeline 232. The two ends of the inlet pipeline 231 are respectively connected with the heat exchanger 2 and the second pump body 51, and the inlet pipeline 231 is provided with a first control valve 2311. The two ends of the return pipeline 232 are respectively connected with the heat exchanger 2 and the second condensate water filter tank 5.

[0040] The first condensate water filter tank 4 and the second condensate water filter tank 5 are connected through a flow guide pipeline 42 provided with a first pump body 41. The second condensate water filter tank 5 and the water collecting tank 6 are connected through a drain pipeline 52 provided with a second pump body 51.

[0041] The first condensate water filter tank 4 is provided with a filter screen assembly 43. The first condensate water filter tank 4 is provided with a first flow meter 44 at the connection with the condensate water pipeline 21, and provided with a second flow meter 45 at the connection with the flow guide pipeline 42. The second condensate water filter tank 5 is provided with a filter membrane assembly 53 and a temperature monitor 54.

[0042] The first condensate water filter tank 4 and the second condensate water filter tank 5 are both provided with a liquid level monitor 7 and a safety valve 8. The safety valve 8 includes a pressure relief valve and an overflow valve. The water collecting tank 6 is provided with a float type liquid level instrument 63.

[0043] As shown in the drawings, Figure 2 The tank body of the first condensate water filter tank 4 and the second condensate water filter tank 5 is sequentially provided from inside to outside with a filter containing cavity 91, a cooling medium interlayer 92, and an overflow interlayer 93. The filter containing cavity 91 and the overflow interlayer 93 are communicated through an overflow port 911 at the top end. The cooling medium interlayer 92 is separated from the filter containing cavity 91 and the overflow interlayer 93. The filter containing cavity 91 of the first condensate water filter tank 4 is communicated with the condensate water pipeline 21 and the flow guide pipeline 42. The filter containing cavity 91 of the second condensate water filter tank 5 is communicated with the flow guide pipeline 42 and the drain pipeline 52.

[0044] The overflow interlayer 93 is provided with a drain port 931. The cooling medium interlayer 92 of the first condensate water filter tank 4 and the second condensate water filter tank 5 is provided with a third circulating heat exchange pipeline 921 connected with an external water pipe.

[0045] The first pump body 41, the second pump body 51, the first flow meter 44, the second flow meter 45, the temperature monitor 54, the liquid level monitor 7, the safety valve 8, the first check valve 211, the second check valve 521, the first control valve 2311, and the float-type liquid level gauge 63 are all connected to the PLC controller.

[0046] In practical use, such as Figure 1 As shown, Figure 1 The arrows in the diagram represent the flow direction of flue gas and water. The flue gas generated by the pure oxygen combustion heating furnace 1 flows into the flue gas pipe 11. The flue gas enters the heat exchanger 2 through the flue gas pipe 11. After being cooled down in the heat exchanger 2, the flue gas is directly discharged to the flue gas emission device 3 through the exhaust pipe 31 for purification treatment. After meeting the standards, it is discharged into the underground flue or the atmosphere.

[0047] The condensate generated during the heat exchange process collects at the bottom of the heat exchanger 2 and flows to the first condensate filter tank 4 through the connected condensate pipe 21. The condensate is filtered by the filter assembly 43 inside the first condensate filter tank 4 to remove larger solid particles. A first flow meter 44 measures the flow rate and velocity of the water flowing into the first condensate filter tank 4, and a second flow meter 45 measures the flow rate and velocity of the water flowing out of the first condensate filter tank 4. The PLC controller compares the data collected by the first flow meter 44 and the second flow meter 45 to determine the degree of blockage in the filter assembly 43 inside the first condensate filter tank 4. If the flow rate and velocity collected by the second flow meter 45 are significantly lower than those collected by the first flow meter 44, it indicates that the filter assembly 43 is severely blocked and needs cleaning or replacement, thus enabling timely monitoring and control of the liquid level in the first condensate filter tank 4. The liquid level monitor 7 monitors the liquid level in the first condensate filter tank 4. When the liquid level is high, the controller can activate the first pump 41 or... The power of the first pump body 41 is adjusted to accelerate the liquid outflow from the first condensate filter tank 4. Simultaneously, when the first pump body 41 malfunctions or fails to operate, or when a large amount of water flows in through the condensate pipe 21, some water flows through the overflow port 911 into the overflow jacket 93 for storage and can be discharged through the drain port 931, thus preventing leakage and overflow. Furthermore, the safety valve 8 installed in the first condensate filter tank 4 can simultaneously monitor and regulate the pressure and liquid level within the filter tank, forming a final layer of protection. Since the condensate flowing out of the heat exchanger 2 still has a high temperature, the air pressure inside the filter tank changes after flowing into it. The safety valve 8 ensures the stability of the pressure inside the filter tank. At the same time, the cooling medium jacket 92 of the first condensate filter tank 4 is connected to the third circulating heat exchange pipe 921, playing a cooling role and further preventing excessive air pressure, thus ensuring safety and stability. Therefore, the first condensate filter tank 4 ensures that condensate does not overflow or leak through multiple layers of protection.

[0048] The water body flowing out from the first condensed water filter tank 4 flows into the second condensed water filter tank 5 through the flow guide pipe 42, and the filter membrane assembly 53 of the second condensed water filter tank 5 further filters and purifies the condensed water. The filtering and purifying of the condensed water and the liquid level regulation process are described above for the first condensed water filter tank 4, which will not be repeated here. The second condensed water filter tank 5 is internally provided with a temperature monitor 54, and is connected with the heat exchanger 2 through the second pump body 51 and the second circulating heat exchange pipe 23. When the temperature monitor 54 monitors that the temperature of the water body in the second condensed water filter tank 5 drops to a certain range, which can be used for heat exchange and condensation of flue gas, the controller starts the second pump body 51 and opens the first control valve 2311. The water body in the second condensed water filter tank 5 flows into the circulating heat exchange pipe of the heat exchanger 2 through the water inlet pipe 231 under the action of the second pump body 51, and flows back to the second condensed water filter tank 5 through the water return pipe 232, to complete the circulating heat exchange and realize the recycling of the condensed water.

[0049] When the liquid level in the second condensed water filter tank 5 is too high, the controller starts the second pump body 51 and opens the second non-return valve 521. The water body flows into the water collecting tank 6 through the drain pipe 52 under the action of the second pump body 51, and is stored and further naturally precipitated in the water collecting tank 6, so as to be used or discharged subsequently.

[0050] Example 2:

[0051] The embodiment 2 of the present application is described by using Figure 4 , and the parts not different from the embodiment 1 are omitted and the same reference numerals are assigned.

[0052] As shown in Figure 4 , the present application relates to a condensed water treatment device for a pure oxygen combustion heating furnace. The water collecting tank 6 is provided with a third pump body 61 connected therewith and a fourth circulating heat exchange pipe 62 connected therewith. The third pump body 61 is connected with the controller. The fourth circulating heat exchange pipe 62 is connected in parallel with the second circulating heat exchange pipe 23, i.e., the water inlet pipe of the fourth circulating heat exchange pipe 62 is connected with the water inlet pipe 231 of the second circulating heat exchange pipe 23, and the water return pipe of the fourth circulating heat exchange pipe 62 is connected with the water return pipe 232 of the second circulating heat exchange pipe 23. Valves connected with the controller are arranged in the water inlet and return pipes of the second circulating heat exchange pipe 23 and the fourth circulating heat exchange pipe 62, to realize independent control of the second circulating heat exchange pipe 23 and the fourth circulating heat exchange pipe 62 for cooling circulation, so as to maximize the recycling of the collected condensed water, reduce the demand and use amount of cooling water of the external water pipe, improve the resource utilization rate, and improve the flue gas condensation treatment effect.

[0053] The condensate treatment device for the pure oxygen combustion heating furnace provided by the application can collect and treat the condensate generated in the flue gas condensation process, effectively avoids the backflow and overflow of the condensate, avoids the damage and corrosion of the heating furnace and the heat exchanger, guarantees the safety of the production environment, has good flue gas cooling effect and high efficiency, filters and purifies the collected condensate, and recycles the condensate, thereby improving the resource utilization rate.

[0054] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application. Any equivalent changes and modifications made within the scope of the application shall still fall within the scope of the application.

Claims

1. A condensate treatment apparatus for a pure oxygen combustion heater, characterized by: The device comprises a pure oxygen combustion heating furnace (1), a heat exchanger (2), a flue gas discharge device (3), a first condensed water filter tank (4), a second condensed water filter tank (5), a water collecting tank (6) and a controller. The heat exchanger (2) is connected with the pure oxygen combustion heating furnace (1) through a flue gas pipeline (11), connected with the flue gas discharge device (3) through a flue gas discharge pipeline (31), and connected with the first condensed water filter tank (4) through a condensed water pipeline (21), and is provided with a first circulating heat exchange pipeline (22) connected with an external water pipe and a second circulating heat exchange pipeline (23) connected with the second condensed water filter tank (5). The first condensed water filter tank (4) and the second condensed water filter tank (5) are connected through a flow guide pipeline (42) provided with a first pump body (41), the second condensed water filter tank (5) and the water collecting tank (6) are connected through a drainage pipeline (52) provided with a second pump body (51), and the second circulating heat exchange pipeline (23) is connected with the second pump body (51). The first condensed water filter tank (4) is provided with a filter screen assembly (43), a first flow meter (44) is arranged at the connection position of the first condensed water filter tank (4) and the condensed water pipeline (21), a second flow meter (45) is arranged at the connection position of the first condensed water filter tank (4) and the flow guide pipeline (42), and the second condensed water filter tank (5) is provided with a filter membrane assembly (53) and a temperature monitor (54). The first condensed water filter tank (4) and the second condensed water filter tank (5) are provided with a liquid level monitor (7) and a safety valve (8). The first pump body (41), the second pump body (51), the first flow meter (44), the second flow meter (45), the temperature monitor (54), the liquid level monitor (7) and the safety valve (8) are connected with the controller. The tank body of the first condensed water filter tank (4) and the second condensed water filter tank (5) is sequentially provided with a filter containing cavity (91), a cooling medium interlayer (92) and an overflow interlayer (93) from inside to outside. The filter containing cavity (91) and the overflow interlayer (93) are communicated through an overflow port (911) at the top end, and the cooling medium interlayer (92) is separated from the filter containing cavity (91) and the overflow interlayer (93). The filter containing cavity (91) of the first condensed water filter tank (4) is communicated with the condensed water pipeline (21) and the flow guide pipeline (42), and the filter containing cavity (91) of the second condensed water filter tank (5) is communicated with the flow guide pipeline (42) and the drainage pipeline (52). The second circulating heat exchange pipeline (23) comprises an inlet pipeline (231) and a return pipeline (232), two ends of the inlet pipeline (231) are connected with the heat exchanger (2) and the second pump body (51) respectively, and the inlet pipeline (231) is provided with a first control valve (2311); two ends of the return pipeline (232) are connected with the heat exchanger (2) and the second condensate water filter tank (5) respectively, and the first control valve (2311) is connected with the controller. The water collecting tank (6) is provided with a third pump body (61) and a fourth circulating heat exchange pipeline (62) connected with each other, the fourth circulating heat exchange pipeline (62) is connected in parallel with the second circulating heat exchange pipeline (23), and the third pump body (61) is connected with the controller.

2. The condensed water treatment apparatus for a pure oxygen combustion heating furnace according to claim 1, characterized by: The overflow interlayer (93) is provided with a drain port (931), and the cooling medium interlayer (92) is provided with a third circulating heat exchange pipeline (921) connected with an external water pipe.

3. The condensed water treatment apparatus for a pure oxygen combustion heating furnace according to claim 1, characterized by: The condensate water pipeline (21) is provided with a first check valve (211), and condensate water can only flow from the heat exchanger (2) to the first condensate water filter tank (4) in one direction; The drain pipeline (52) is provided with a second check valve (521), and condensate water can only flow from the second condensate water filter tank (5) to the water collecting tank (6) in one direction; The first check valve (211) and the second check valve (521) are connected with the controller.

4. The condensed water treatment apparatus for a pure oxygen combustion heating furnace according to claim 1, characterized by: The water collecting tank (6) is provided with a float type liquid level instrument (63).

5. The condensed water treatment apparatus for a pure oxygen combustion heating furnace according to claim 1, characterized by: The safety valve (8) is a pressure relief valve and / or an overflow valve.

6. The condensed water treatment apparatus for a pure oxygen combustion heating furnace according to claim 1, characterized by: The controller is a PLC controller.

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