CN206593082U - Gasify workshop heat tracing condensation water recovery system - Google Patents
Gasify workshop heat tracing condensation water recovery system Download PDFInfo
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Abstract
本实用新型公开了一种气化车间伴热凝结液回收系统，其包括伴热凝液收集箱、第一抽气器、换热器、凝液回收罐、第二抽气器，凝结液回收管出口端与第一抽气器的吸气口连通，第一抽气器的出水口通过管路与换热器的热介质入口连通，换热器的热介质出口通过管路与凝液回收罐进水口连通；凝液回收罐的出水口通过管路与第一循环泵进水口连通，第一循环泵出水口通过管路分别与第一抽气器的进水口和第二抽气器的进水口连通。优点：依靠抽气器抽负压原理降低凝结液回收管压力，使较远区域的凝液依然可以回收形成通路，使凝液回收通畅；进而防止伴热系统形成死水，保证伴热系统正常运转，减少巡检人员工作量。
The utility model discloses a heating condensate recovery system for a gasification workshop, which comprises a heating condensate collection box, a first air extractor, a heat exchanger, a condensate recovery tank, a second air extractor, and a condensate recovery system. The outlet end of the pipe is connected with the suction port of the first aspirator, the water outlet of the first aspirator is connected with the heat medium inlet of the heat exchanger through the pipeline, and the heat medium outlet of the heat exchanger is recovered with the condensate through the pipeline The water inlet of the tank is connected; the water outlet of the condensate recovery tank is connected with the water inlet of the first circulation pump through the pipeline, and the water outlet of the first circulation pump is respectively connected with the water inlet of the first air extractor and the water inlet of the second air extractor through the pipeline. The water inlet is connected. Advantages: Relying on the negative pressure principle of the air extractor to reduce the pressure of the condensate recovery pipe, so that the condensate in the far area can still be recovered to form a path, so that the condensate recovery is smooth; thereby preventing the heating system from forming stagnant water and ensuring the normal operation of the heating system , to reduce the workload of inspectors.
Description
技术领域：Technical field:
本实用新型涉及凝结液回收技术领域，具体地说涉及一种气化车间伴热凝结液回收系统。The utility model relates to the technical field of condensate recovery, in particular to a heating condensate recovery system in a gasification workshop.
背景技术：Background technique:
鄂尔多斯市国泰化工有限公司位于鄂尔多斯市杭锦旗独贵特拉工业园区，公司一期规模为年产40万吨甲醇，20000吨杂醇油，5000吨硫磺。主要工艺单元有水煤浆气化工艺、低温甲醇洗工艺、有效气合成和粗甲醇精馏等工艺及配套的伴热蒸汽系统和凝液回收管网等公用工程。现有的气化蒸汽伴热系统依靠0.5MPa蒸汽伴热后的背压进入伴热凝液系统管网进行回收，由于伴热系统的疏水阀数量多达1200台，若靠近回收装置(变换除氧器)附近的疏水阀内漏就会造成凝液回收管网压力高，较远区域的伴热凝液就无法回到除氧器，在伴热系统内形成死水，使伴热系统失去作用，尤其是在冬季会造成伴热管网冻堵，需要工人巡检维修，工作量大。Ordos Guotai Chemical Co., Ltd. is located in Duguitra Industrial Park, Hangjin Banner, Ordos City. The first phase of the company has an annual output of 400,000 tons of methanol, 20,000 tons of fusel oil, and 5,000 tons of sulfur. The main process units include coal-water slurry gasification process, low-temperature methanol washing process, effective gas synthesis, crude methanol rectification and other processes, as well as supporting heating steam system and condensate recovery pipe network and other public works. The existing gasification steam heat tracing system relies on the back pressure of 0.5MPa steam heat tracing to enter the pipe network of the heat tracing condensate system for recovery. Since the number of steam traps in the heat tracing system is as many as 1200, if it is close to the recovery device (transformation except The internal leakage of the trap near the oxygen device) will cause the pressure of the condensate recovery pipe network to be high, and the heat tracing condensate in the farther area cannot return to the deaerator, and stagnant water will be formed in the heat tracing system, making the heat tracing system useless , especially in winter, it will cause the heating pipe network to freeze and block, requiring workers to inspect and repair, and the workload is heavy.
实用新型内容：Utility model content:
本实用新型的目的在于提供一种降低凝结水回收管压力、防止伴热系统形成死水的气化车间伴热凝结液回收系统。The purpose of the utility model is to provide a heat tracing condensate recovery system in a gasification workshop which reduces the pressure of the condensate recovery pipe and prevents the heat tracing system from forming stagnant water.
本实用新型由如下技术方案实施：气化车间伴热凝结液回收系统，其包括伴热凝液收集箱、第一抽气器、换热器、凝液回收罐、第二抽气器，伴热管通过疏水阀与所述伴热凝液收集箱连通，所述伴热凝液收集箱通过回流管与凝结液回收管上部连通；所述凝结液回收管出口端与所述第一抽气器的吸气口连通，所述第一抽气器的出水口通过管路与所述换热器的热介质入口连通，所述换热器的热介质出口通过管路与所述凝液回收罐进水口连通；所述凝液回收罐的出水口通过管路与第一循环泵进水口连通，所述第一循环泵出水口通过管路分别与所述第一抽气器的进水口和所述第二抽气器的进水口连通；所述第二抽气器的吸气口通过管路与所述凝液回收罐的排气口连通。The utility model is implemented by the following technical scheme: a heating condensate recovery system in a gasification workshop, which includes a heating condensate collection box, a first air extractor, a heat exchanger, a condensate recovery tank, a second air extractor, The heat pipe communicates with the heat tracing condensate collection box through a steam trap, and the heat tracing condensate collection box communicates with the upper part of the condensate recovery pipe through a return pipe; the outlet end of the condensate recovery pipe is connected to the first air extractor The suction port of the first air extractor communicates with the heat medium inlet of the heat exchanger through a pipeline, and the heat medium outlet of the heat exchanger communicates with the condensate recovery tank through a pipeline The water inlet is connected; the water outlet of the condensate recovery tank is connected with the water inlet of the first circulation pump through the pipeline, and the water outlet of the first circulation pump is respectively connected with the water inlet of the first air extractor and the water inlet of the first circulation pump through the pipeline. The water inlet of the second aspirator is connected; the suction port of the second aspirator is communicated with the exhaust port of the condensate recovery tank through a pipeline.
进一步的，其还包括检修管路，所述检修管路一端与所述换热器和所述第一抽气器之间的管路连通，所述检修管路另一端与所述换热器和所述凝液回收罐之间的管路连通；在所述检修管路上设有检修控制阀，在所述检修管路与所述换热器热介质入口之间的管路上设有进液控制阀，在所述检修管路与所述换热器热介质出口之间的管路上设有出液控制阀。Further, it also includes a maintenance pipeline, one end of the maintenance pipeline communicates with the pipeline between the heat exchanger and the first air extractor, and the other end of the maintenance pipeline communicates with the heat exchanger It communicates with the pipeline between the condensate recovery tank; a maintenance control valve is provided on the maintenance pipeline, and a liquid inlet is provided on the pipeline between the maintenance pipeline and the heat medium inlet of the heat exchanger. A control valve is provided with a liquid outlet control valve on the pipeline between the maintenance pipeline and the heat medium outlet of the heat exchanger.
进一步的，其还包括与所述第一循环泵并列设置的第二循环泵，在所述第一循环泵的进水端和出水端分别设有第一泵前控制阀和第一泵后控制阀，在所述第二循环泵的进水端和出水端分别设有第二泵前控制阀和第二泵后控制阀。Further, it also includes a second circulation pump arranged in parallel with the first circulation pump, and a first pump front control valve and a first pump rear control valve are respectively provided at the water inlet end and the water outlet end of the first circulation pump. A valve, a control valve before the second pump and a control valve after the second pump are respectively provided at the water inlet end and the water outlet end of the second circulation pump.
进一步的，其还包括控制器，在所述凝液回收罐内壁上设有液位计，在所述第一抽气器进水端设有第一流量控制阀，在所述第二抽气器进水端设有第二流量控制阀；所述液位计与所述控制器的输入端连接，所述控制器输出端分别与所述第一循环泵、所述第二循环泵、所述第一流量控制阀、所述第二流量控制阀连接。Further, it also includes a controller, a liquid level gauge is provided on the inner wall of the condensate recovery tank, a first flow control valve is provided at the water inlet end of the first aspirator, and a flow control valve is provided at the water inlet of the second aspirator. The water inlet end of the device is provided with a second flow control valve; the liquid level gauge is connected to the input end of the controller, and the output end of the controller is respectively connected to the first circulating pump, the second circulating pump, and the The first flow control valve and the second flow control valve are connected.
进一步的，所述回流管顶端沿斜向上45°方向沿着所述凝结液回收管内凝液的流动方向插入所述凝结液回收管上部。Further, the top end of the return pipe is inserted into the upper part of the condensate recovery pipe along the direction of the condensate flow in the condensate recovery pipe in an oblique upward direction of 45°.
本实用新型的优点：依靠抽气器抽负压原理降低凝结液回收管压力，在较多疏水阀内漏的情况下伴热凝液管网压力依然较低，使较远区域的凝液依然可以回收形成通路，使凝液回收通畅；进而防止伴热系统形成死水，保证伴热系统正常运转，减少巡检人员工作量。The utility model has the advantages of reducing the pressure of the condensate recovery pipe by relying on the negative pressure principle of the air extractor, and the pressure of the heating condensate pipe network is still low in the case of internal leakage of many drain valves, so that the condensate in the far area remains still It can be recovered to form a passage, so that the condensate can be recovered smoothly; thereby preventing stagnant water in the heating system, ensuring the normal operation of the heating system, and reducing the workload of inspection personnel.
附图说明：Description of drawings:
图1为本实用新型的整体结构示意图。Figure 1 is a schematic diagram of the overall structure of the utility model.
伴热凝液收集箱1、第一抽气器2、换热器3、凝液回收罐4、第二抽气器5、伴热管6、回流管7、凝结液回收管8、第一循环泵9、检修管路10、检修控制阀11、进液控制阀12、出液控制阀13、第二循环泵14、第一维修旁路15、第二维修旁路16、旁通控制阀17、第一泵前控制阀18、第一泵后控制阀19、第二泵前控制阀20、第二泵后控制阀21、控制器22、液位计23、第一流量控制阀25、第二流量控制阀26、疏水阀27、冷脱盐水补充口28。Heat tracing condensate collection box 1, first air extractor 2, heat exchanger 3, condensate recovery tank 4, second air extractor 5, heat tracing pipe 6, return pipe 7, condensate recovery pipe 8, first cycle Pump 9, maintenance pipeline 10, maintenance control valve 11, liquid inlet control valve 12, liquid outlet control valve 13, second circulating pump 14, first maintenance bypass 15, second maintenance bypass 16, bypass control valve 17 , The control valve 18 before the first pump, the control valve 19 after the first pump, the control valve 20 before the second pump, the control valve 21 after the second pump, the controller 22, the liquid level gauge 23, the first flow control valve 25, the second pump Two flow control valves 26, steam traps 27, cold desalted water supply ports 28.
具体实施方式：detailed description:
如图1所示，气化车间伴热凝结液回收系统，其包括伴热凝液收集箱1、第一抽气器2、换热器3、凝液回收罐4、第二抽气器5，伴热管6通过疏水阀27与伴热凝液收集箱1连通，伴热凝液收集箱1通过回流管7与凝结液回收管8内部连通；凝结液回收管8出口端与第一抽气器2的吸气口连通，第一抽气器2的出水口通过管路与换热器3的热介质入口连通，换热器3的热介质出口通过管路与凝液回收罐4进水口连通；凝液回收罐4的出水口通过管路与第一循环泵9进水口连通，第一循环泵9出水口通过管路分别与第一抽气器2的进水口和第二抽气器5的进水口连通；第二抽气器5的吸气口通过管路与凝液回收罐4的排气口连通；As shown in Figure 1, the heat traced condensate recovery system in the gasification workshop includes a heat traced condensate collection tank 1, a first air extractor 2, a heat exchanger 3, a condensate recovery tank 4, and a second air extractor 5 , the heat tracing pipe 6 communicates with the heat tracing condensate collection box 1 through the steam trap 27, and the heat tracing condensate collection box 1 communicates with the inside of the condensate recovery pipe 8 through the return pipe 7; The suction port of the device 2 is connected, the water outlet of the first air extractor 2 is connected with the heat medium inlet of the heat exchanger 3 through the pipeline, and the heat medium outlet of the heat exchanger 3 is connected with the water inlet of the condensate recovery tank 4 through the pipeline Connected; the water outlet of the condensate recovery tank 4 is communicated with the water inlet of the first circulation pump 9 through the pipeline, and the water outlet of the first circulation pump 9 is connected with the water inlet of the first air extractor 2 and the second air extractor respectively through the pipeline The water inlet of 5 is communicated; The suction port of the second aspirator 5 is communicated with the exhaust port of condensate recovery tank 4 through pipeline;
凝液回收罐4罐体带有冷脱盐水补充口28，可用于降低凝液回收罐4罐体温度和提高罐体水位，防止大量疏水阀27故障带来较多蒸汽而换热器3无法冷凝导致水温高而引起的第一循环泵9或第二循环泵14汽蚀现象；The condensate recovery tank 4 has a cold desalinated water supply port 28, which can be used to reduce the temperature of the condensate recovery tank 4 and increase the water level of the tank, so as to prevent a large number of steam traps 27 from causing more steam and the heat exchanger 3 cannot Cavitation of the first circulating pump 9 or the second circulating pump 14 caused by high water temperature due to condensation;
其还包括检修管路10，检修管路10一端与换热器3和第一抽气器2之间的管路连通，检修管路10另一端与换热器3和凝液回收罐4之间的管路连通；在检修管路10上设有检修控制阀11，在检修管路10与换热器3热介质入口之间的管路上设有进液控制阀12，在检修管路10与换热器3热介质出口之间的管路上设有出液控制阀13。It also includes a maintenance pipeline 10, one end of the maintenance pipeline 10 communicates with the pipeline between the heat exchanger 3 and the first air extractor 2, and the other end of the maintenance pipeline 10 communicates with the heat exchanger 3 and the condensate recovery tank 4. The pipelines between them are connected; on the maintenance pipeline 10, there is a maintenance control valve 11, on the pipeline between the maintenance pipeline 10 and the heat medium inlet of the heat exchanger 3, there is a liquid inlet control valve 12, on the maintenance pipeline 10 A liquid outlet control valve 13 is provided on the pipeline between the heat medium outlet of the heat exchanger 3 .
其还包括与第一循环泵9并列设置的第二循环泵14，在第一循环泵9的进水端和出水端分别设有第一泵前控制阀18和第一泵后控制阀19，在第二循环泵14的进水端和出水端分别设有第二泵前控制阀20和第二泵后控制阀21。It also includes a second circulation pump 14 arranged in parallel with the first circulation pump 9, and a first pump front control valve 18 and a first pump rear control valve 19 are respectively provided at the water inlet end and the water outlet end of the first circulation pump 9, A second pump front control valve 20 and a second pump rear control valve 21 are respectively provided at the water inlet end and the water outlet end of the second circulation pump 14 .
其还包括与第一循环泵9并联设置的第一维修旁路15和与第二循环泵14并联设置的第二维修旁路16；第一维修旁路15的进水端与第一泵前控制阀18入口端连通，第一维修旁路15的出水端与第一泵后控制阀19的出水端连通；第二维修旁路16的进水端与第二泵前控制阀20的入口端连通，第二维修旁路16的出水端与第二泵后控制阀21的出水端连通；在第一维修旁路15和第二维修旁路16上均装设有旁通控制阀17。It also includes a first maintenance bypass 15 set in parallel with the first circulation pump 9 and a second maintenance bypass 16 set in parallel with the second circulation pump 14; the water inlet end of the first maintenance bypass 15 is connected to the first pump front The inlet port of the control valve 18 is connected, the outlet port of the first maintenance bypass 15 is connected with the outlet port of the control valve 19 after the first pump; the inlet port of the second maintenance bypass 16 is connected with the inlet port of the control valve 20 in front of the second pump The water outlet of the second maintenance bypass 16 communicates with the water outlet of the second pump rear control valve 21; a bypass control valve 17 is installed on the first maintenance bypass 15 and the second maintenance bypass 16.
其还包括控制器22，在凝液回收罐4内壁上设有液位计23，液位计23的高低液位检测口设置在凝液回收罐4内部，在第一抽气器2进水端设有第一流量控制阀25，在第二抽气器5进水端设有第二流量控制阀26；液位计23与控制器22的输入端连接，控制器22输出端分别与第一循环泵9、第二循环泵14、第一流量控制阀25、第二流量控制阀26连接；液位计23用于实时检测凝液回收罐4内的液位，并将检测到的液位新型发送到控制器22，控制器22根据接收到的液位信息调节第一循环泵9和第二循环泵14的效率以及第一流量控制阀25和第二流量控制阀26的流量；It also includes a controller 22, a liquid level gauge 23 is provided on the inner wall of the condensate recovery tank 4, and the high and low liquid level detection ports of the liquid level gauge 23 are arranged inside the condensate recovery tank 4, and the first air extractor 2 is fed with water A first flow control valve 25 is provided at the end, and a second flow control valve 26 is provided at the water inlet end of the second aspirator 5; the liquid level gauge 23 is connected with the input end of the controller 22, and the output end of the controller 22 is respectively connected with the first A circulation pump 9, the second circulation pump 14, the first flow control valve 25, and the second flow control valve 26 are connected; the liquid level gauge 23 is used for real-time detection of the liquid level in the condensate recovery tank 4, and the detected liquid The new position is sent to the controller 22, and the controller 22 adjusts the efficiency of the first circulation pump 9 and the second circulation pump 14 and the flows of the first flow control valve 25 and the second flow control valve 26 according to the received liquid level information;
由于第一抽气器2的抽负因素在抽气口形成负压降低凝结液回收管8压力，使凝结液回收管8形成负压或微正压；同时，回流管7顶端沿斜向上45°方向沿着凝结液回收管8内凝液的流动方向插入凝结液回收管8上部，可使进入回流管7的水汽分离，即水依靠重力下流，汽体靠背压进入管网，如此可防止由于汽体的背压高影响水进入凝液管道。这样即使在较多疏水阀27内漏的情况下伴热管6压力依然较低，较远区域的凝液依然可以回收形成通路，发挥伴热系统的作用。Due to the negative pumping factor of the first air extractor 2, a negative pressure is formed at the air suction port to reduce the pressure of the condensate recovery pipe 8, so that the condensate recovery pipe 8 forms a negative pressure or a slight positive pressure; at the same time, the top of the return pipe 7 is inclined upward by 45° The direction is inserted into the upper part of the condensate recovery pipe 8 along the flow direction of the condensate in the condensate recovery pipe 8, so that the water vapor entering the return pipe 7 can be separated, that is, the water flows down by gravity, and the gas enters the pipe network against the back pressure. The high back pressure of the vapor interferes with the entry of water into the condensate line. In this way, even in the case of internal leakage of many steam traps 27, the pressure of the heat tracing pipe 6 is still low, and the condensate in the far region can still be recovered to form a passage, and the effect of the heat tracing system can be brought into play.
工作原理：系统运行初始，关闭检修控制阀11、旁通控制阀17、第二泵前控制阀20、第二泵后控制阀21，打开进液控制阀12、出液控制阀13、第一泵前控制阀18、第一泵后控制阀19；伴热管6输出的伴热蒸汽换热后变为气水混合物后经疏水阀27流入伴热凝液收集箱1；利用第一抽气器2抽负原理抽走凝结液回收管8中的蒸汽，凝结液回收管8内部形成负压，进而促使伴热凝液收集箱1内的凝结液经回流管7进入凝结液回收管8，凝结液回收管8中的凝结液经第一抽气器2进入换热器3与车间循环水换热后进入凝结液回收器4内，通过换热器3降低凝结液温度，确保凝结液温度低于100℃；通过第一循环泵9将凝结液回收器4排出的凝结液加压到0.8MPa打出分两路泵出，一路经第二抽气器5送入凝结水管网进行循环利用，另一路经第一抽气器2再次进入换热器3实现自循环利用；经第一抽气器进行自循环利用可实现以下两个作用：一方面，通过水泵回流形式，保证水泵汽蚀余量所需要的压头，确保水泵再输送高温水时，水泵不发生汽蚀，另一方面，可以为凝液回收罐4补入足够的凝结液，保证凝液回收罐4的水位；Working principle: when the system is running initially, close the inspection control valve 11, bypass control valve 17, control valve 20 before the second pump, control valve 21 after the second pump, open the inlet control valve 12, outlet control valve 13, first The control valve 18 before the pump and the control valve 19 after the first pump; the heat-tracing steam output by the heat-tracing pipe 6 turns into a gas-water mixture after heat exchange, and then flows into the heat-tracing condensate collection tank 1 through the trap 27; using the first air extractor 2. The negative pumping principle pumps away the steam in the condensate recovery pipe 8, and a negative pressure is formed inside the condensate recovery pipe 8, which in turn causes the condensate in the heating condensate collection tank 1 to enter the condensate recovery pipe 8 through the return pipe 7, and condenses The condensate in the liquid recovery pipe 8 enters the heat exchanger 3 through the first air extractor 2 and enters the condensate recovery device 4 after exchanging heat with the workshop circulating water. The temperature of the condensate is lowered through the heat exchanger 3 to ensure that the temperature of the condensate is low. at 100°C; the condensate discharged from the condensate recovery device 4 is pressurized to 0.8MPa through the first circulation pump 9 and pumped out in two ways, one way is sent to the condensate pipe network through the second air extractor 5 for recycling, and the other is One way passes through the first air extractor 2 and enters the heat exchanger 3 again to realize self-circulation utilization; the self-circulation utilization through the first air extractor can realize the following two functions: on the one hand, through the return flow form of the water pump, the NPSH of the water pump is guaranteed The required pressure head can ensure that the water pump does not cause cavitation when the water pump transports high-temperature water. On the other hand, it can fill the condensate recovery tank 4 with enough condensate to ensure the water level of the condensate recovery tank 4;
当换热器3出现故障，需要检修时，关闭进液控制阀12和出液控制阀13，并打开检修控制阀11，此时，第一抽气器2出水口输出的凝结水经检修管路10直接进入凝液回收罐4；检修完毕后，关闭检修控制阀11，打开进液控制阀12和出液控制阀13，换热器3即可正常使用；When the heat exchanger 3 breaks down and needs to be repaired, close the liquid inlet control valve 12 and the liquid outlet control valve 13, and open the inspection control valve 11. At this time, the condensed water output from the outlet of the first air extractor 2 passes through the inspection pipe The road 10 directly enters the condensate recovery tank 4; after the maintenance is completed, close the maintenance control valve 11, open the liquid inlet control valve 12 and the liquid outlet control valve 13, and the heat exchanger 3 can be used normally;
当第一循环泵9损坏时，关闭第一泵前控制阀18和第一泵后控制阀19，打开第二泵前控制阀20、第二泵后控制阀21，此时，第二循环泵14将凝液回收罐4中的凝结液分别泵送到第一抽气器2和第二抽气器5，便于第一循环泵9的维护，保证系统正常运行；When the first circulating pump 9 was damaged, close the first pump front control valve 18 and the first pump rear control valve 19, open the second pump front control valve 20, the second pump rear control valve 21, at this moment, the second circulating pump 14 Pump the condensate in the condensate recovery tank 4 to the first air extractor 2 and the second air extractor 5 respectively, so as to facilitate the maintenance of the first circulation pump 9 and ensure the normal operation of the system;
当液位计23检测到凝液回收罐4内的液位低于控制器22设定的最低液位值时，控制器22依据设定程序调节第一流量控制阀25的开度大于第二流量控制阀26的开度，使第一循环泵9或第二循环泵14泵出的凝结水大部分输入到第一抽气器2进而经换热器3进入凝液回收罐4，以保证凝液回收罐4的液位；当液位计23检测到凝液回收罐4的液位高于控制器22设定的最高液位值时，控制器22依据设定程序调节第二流量控制阀26的开度大于第一流量控制阀25的开度，使第一循环泵9或第二循环泵14泵出的凝结水大部分输入凝结水管网。When the liquid level meter 23 detects that the liquid level in the condensate recovery tank 4 is lower than the minimum liquid level value set by the controller 22, the controller 22 adjusts the opening of the first flow control valve 25 to be greater than the second according to the set program. The opening of the flow control valve 26 is such that most of the condensed water pumped out by the first circulation pump 9 or the second circulation pump 14 is input to the first air extractor 2 and then enters the condensate recovery tank 4 through the heat exchanger 3 to ensure The liquid level of the condensate recovery tank 4; when the liquid level meter 23 detects that the liquid level of the condensate recovery tank 4 is higher than the maximum liquid level value set by the controller 22, the controller 22 adjusts the second flow control according to the set procedure The opening degree of the valve 26 is greater than that of the first flow control valve 25, so that most of the condensed water pumped out by the first circulating pump 9 or the second circulating pump 14 is input into the condensed water pipe network.
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.
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