Waste heat recycling system

Abstract

The utility model provides a waste heat recycling system. The waste heat recycling system comprises a waste steam generator, a waste heat recycling device and a demineralized water conveying pipe, the waste steam generator is connected with the steam pipe network and the waste heat boiler so as to obtain steam drain water of the steam pipe network and boiler sewage of the waste heat boiler and generate low-temperature waste steam, and the waste heat recycling device is arranged on the demineralized water conveying pipe and connected with the waste steam generator. And low-temperature dead steam of the dead steam generator exchanges heat with demineralized water of the demineralized water conveying pipe. According to the waste heat recycling system, the waste steam generator obtains steam drain water of the steam pipe network and boiler sewage of the waste heat boiler and generates low-temperature waste steam, the low-temperature waste steam is supplied to the waste heat recycling device and exchanges heat with demineralized water conveyed by the demineralized water conveying pipe, and therefore heat of the steam drain water and heat of the boiler sewage are recycled and the demineralized water is heated. Heat carried by steam drainage and boiler sewage is recycled, the use amount of energy such as steam for heating demineralized water is reduced, and the operation cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of waste heat recovery, specifically relates to a waste heat recovery system. BACKGROUND

[0002] In industrial plants such as non-ferrous smelting plants, steam pipe network of equipment will produce steam drainage, waste heat boiler will discharge boiler sewage, steam drainage and boiler sewage both have high temperature, direct discharge will cause heat waste. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the related art is solved to some extent.

[0004] Therefore, the embodiment of the utility model provides a waste heat recovery system.

[0005] The waste heat recovery system of the utility model embodiment comprises:

[0006] The steam generator is connected with the steam pipe network and the waste heat boiler respectively to obtain steam drainage of the steam pipe network and boiler sewage of the waste heat boiler and generate low-temperature steam, the waste heat recovery device is arranged on the desalted water conveying pipe and connected with the steam generator to make the low-temperature steam supplied by the steam generator exchange heat with the desalted water conveyed by the desalted water conveying pipe.

[0007] The waste heat recovery system of the utility model embodiment obtains steam drainage of the steam pipe network and boiler sewage of the waste heat boiler through the steam generator and generates low-temperature steam, then supplies the low-temperature steam to the waste heat recovery device to exchange heat with the desalted water conveyed by the desalted water conveying pipe, thereby recovering heat of steam drainage and boiler sewage and heating desalted water, realizing recovery and utilization of heat carried by steam drainage and boiler sewage, and reducing the amount of energy such as steam for heating desalted water, so that the operation cost is low.

[0008] In some embodiments, the waste heat recovery device is provided with a condensate outlet for discharging condensate generated by the low-temperature steam heat exchange;

[0009] The waste heat recovery system further comprises a condensate recovery device connected with the condensate outlet to receive the condensate discharged by the condensate outlet.

[0010] In some embodiments, the waste heat recovery device is provided with a non-condensable steam outlet for discharging non-condensable steam after the low-temperature steam heat exchange;

[0011] The waste heat recovery system further comprises a negative pressure device connected to the non-condensable gas outlet to provide negative pressure to the non-condensable gas outlet.

[0012] In some embodiments, the waste heat recovery system further comprises a deaerator connected to an outlet end of the desalted water delivery pipe to deaerate the desalted water, and the condensate recovery device is connected to the deaerator to supply the received condensate to the deaerator.

[0013] In some embodiments, the exhaust steam generator comprises a first exhaust steam generator connected to the steam pipe network to obtain steam drain and generate low-temperature exhaust steam, and a second exhaust steam generator connected to the waste heat boiler to obtain boiler sewage and generate low-temperature exhaust steam.

[0014] The waste heat recovery device comprises a first waste heat recovery device and a second waste heat recovery device, the first waste heat recovery device is arranged on the desalted water delivery pipe and connected to the first exhaust steam generator to exchange heat between the low-temperature exhaust steam supplied by the first exhaust steam generator and the desalted water delivered by the desalted water delivery pipe, and the second waste heat recovery device is arranged on the desalted water delivery pipe and connected to the second exhaust steam generator to exchange heat between the low-temperature exhaust steam supplied by the second exhaust steam generator and the desalted water delivered by the desalted water delivery pipe.

[0015] In some embodiments, the first waste heat recovery device and the second waste heat recovery device are connected in series and / or in parallel on the desalted water delivery pipe.

[0016] In some embodiments, the condensate recovery device comprises a first condensate collection container and a second condensate collection container, an inlet of the first condensate collection container is connected to the condensate outlet of the first waste heat recovery device, an inlet of the second condensate collection container is connected to the condensate outlet of the second waste heat recovery device, and outlets of the first condensate collection container and the second condensate collection container are both connected to the deaerator.

[0017] In some embodiments, the condensate recovery device further comprises a condensate storage container, outlets of the first condensate collection container and the second condensate collection container are both connected to an inlet of the condensate storage container, and an outlet of the condensate storage container is connected to the deaerator.

[0018] In some embodiments, the condensate recovery device further comprises a first pump group connected to the outlets of the first condensate collection container and the second condensate collection container in parallel, and the first pump group is connected to the inlet of the condensate storage container.

[0019] In some embodiments, the non-condensable gas outlet of the first waste heat recovery device and the non-condensable gas outlet of the second waste heat recovery device are both connected to the negative pressure device.

[0020] In some embodiments, the deaerator is provided with a non-condensable gas discharge port for discharging non-condensable gas in the deaerator, and the negative pressure device is connected to the non-condensable gas discharge port to provide negative pressure to the non-condensable gas discharge port.

[0021] In some embodiments, the waste heat recovery system further comprises a deaerated water container, an inlet of the deaerated water container being connected to an outlet of the deaerator for receiving and storing deaerated water supplied by the deaerator; and / or

[0022] The waste heat recovery system further comprises at least one of a water supply pipe and a backflow pipe, the water supply pipe being connected between an outlet of the deaerated water container or an outlet of the deaerator and the waste heat boiler for supplying deaerated water to the waste heat boiler, and the backflow pipe being connected between the outlet of the deaerated water container or the outlet of the deaerator and the deaerator for backflowing deaerated water to the deaerator. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of a waste heat recovery system according to an embodiment of the present application.

[0024] REFERENCE NUMERALS:

[0025] 1, steam generator; 11, first steam generator; 12, second steam generator; 2, waste heat recovery device; 21, first waste heat recovery device; 22, second waste heat recovery device; 3, desalted water delivery pipe; 31, main path; 32, branch path; 4, steam pipe network; 5, waste heat boiler; 6, condensate recovery device; 61, first condensate collection container; 62, second condensate collection container; 63, condensate storage container; 64, first pump set; 7, negative pressure device; 8, deaerator; 9, chemical water treatment station; 10, deaerated water container; 20, second pump set; 30, water supply pipe; 40, backflow pipe. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0027] The following description is made with reference to the accompanying drawings, which are provided as examples. Figure 1 A waste heat recovery system according to an embodiment of the present application is described below.

[0028] As Figure 1As shown, the waste heat recycling system of the embodiment of the utility model includes a steam generator 1, a waste heat recovery device 2 and a desalted water delivery pipe 3.

[0029] The steam generator 1 is connected with the steam pipe network 4 and the waste heat boiler 5 respectively to obtain the steam drain of the steam pipe network 4 and the boiler sewage of the waste heat boiler 5 and generate low-temperature steam. The steam generator 1 is preferably but not limited to a flash tank.

[0030] The waste heat recovery device 2 is arranged on the desalted water delivery pipe 3 and connected with the steam generator 1 to make the low-temperature steam supplied by the steam generator 1 exchange heat with the desalted water delivered by the desalted water delivery pipe 3. For example, as shown in the figure, Figure 1 As shown, the inlet end of the desalted water delivery pipe 3 is connected with a chemical water treatment station 9 to obtain and deliver the desalted water discharged by the chemical water treatment station 9.

[0031] The waste heat recycling system of the embodiment of the utility model obtains the steam drain of the steam pipe network and the boiler sewage of the waste heat boiler through the steam generator and generates low-temperature steam, then supplies the low-temperature steam to the waste heat recovery device to exchange heat with the desalted water delivered by the desalted water delivery pipe, thereby recycling the heat of the steam drain and the boiler sewage and heating the desalted water, realizing the recycling of the heat carried by the steam drain and the boiler sewage. Since the desalted water needs to be heated to the required temperature by steam or electric power in the related art, the desalted water is heated by the heat of the steam drain and the boiler sewage, thereby reducing the amount of energy such as steam and electric power used for heating the desalted water, so that the operation cost is low.

[0032] In some embodiments, the waste heat recovery device 2 is provided with a condensate water outlet for discharging the condensate water generated by the low-temperature steam exchange. The waste heat recycling system further includes a condensate water recovery device 6 connected with the condensate water outlet to receive the condensate water discharged by the condensate water outlet.

[0033] As shown in the figure, Figure 1 As shown, the waste heat recovery device 2 has a shell and a first heat exchange cavity and a second heat exchange cavity arranged in the shell, the inlet of the first cavity is connected with the steam generator 1 through a pipeline to receive the low-temperature steam discharged by the steam generator 1, the second heat exchange cavity is arranged on the desalted water delivery pipe 3 for the desalted water to pass through, and the low-temperature steam in the first heat exchange cavity exchanges heat with the desalted water in the second heat exchange cavity to increase the temperature of the desalted water.

[0034] The shell of the waste heat recovery device 2 is provided with a condensate water outlet in communication with the first heat exchange cavity, the low-temperature steam in the first heat exchange cavity generates condensate water after heat exchange and temperature reduction, and the generated condensate water is discharged from the condensate water outlet.

[0035] The inlet end of the condensate water recovery device 6 is connected with the condensate water outlet through a pipeline to receive the condensate water discharged from the condensate water outlet, so that the condensate water is prevented from accumulating in the first heat exchange cavity to affect the heat exchange effect, and the condensate water is stored for convenient utilization.

[0036] In some embodiments, the waste heat recovery device 2 is provided with a non-condensable steam outlet for discharging the non-condensable steam after heat exchange of the low-temperature waste steam.

[0037] As shown in Figure 1 , the shell of the waste heat recovery device 2 is provided with a non-condensable steam outlet, which is in communication with the first heat exchange cavity. The low-temperature waste steam in the first heat exchange cavity generates non-condensable steam after heat exchange and cooling. In other words, the non-condensable steam is the remaining part of the low-temperature waste steam after heat exchange and cooling. The non-condensable steam is discharged from the non-condensable steam outlet.

[0038] The inlet end of the negative pressure device 7 is connected with the non-condensable steam outlet through a pipeline. The negative pressure device 7 is preferably but not limited to a vacuum device such as a water ring vacuum pump and a water jet air ejector. The negative pressure device 7 provides negative pressure to the non-condensable steam outlet to extract the non-condensable steam in the first heat exchange cavity from the non-condensable steam outlet, and then discharge the non-condensable steam from the outlet end of the negative pressure device 7 to the atmospheric environment, thereby effectively reducing the amount of steam discharged to the atmospheric environment.

[0039] The negative pressure device 7 assists in discharging the non-condensable steam from the non-condensable steam outlet, thereby improving the discharge rate of the non-condensable steam through negative pressure, and improving the rate of the low-temperature waste steam entering the first heat exchange cavity and the heat exchange efficiency of the low-temperature waste steam in the first heat exchange cavity.

[0040] In some embodiments, the waste heat recovery and utilization system of the utility model embodiment further comprises a deaerator 8 connected with the outlet end of the desalted water conveying pipe 3 for deaerating the desalted water. The condensate water recovery device 6 is connected with the deaerator 8 to supply the received condensate water to the deaerator 8.

[0041] As shown in Figure 1 , the outlet end of the desalted water conveying pipe 3 is connected with the inlet of the deaerator 8. The desalted water after heat exchange and temperature rise in the waste heat recovery device 2 is supplied to the deaerator 8 for deaeration in the deaerator 8, so that the desalted water can be utilized.

[0042] The outlet end of the condensate water recovery device 6 is connected with the water supply port of the deaerator 8 through a pipeline. The condensate water received and stored by the waste heat recovery device 2 is supplied to the deaerator 8 as make-up water for utilization, so that the condensate water is recovered and utilized, and the operation cost is low.

[0043] Further, the deaerator 8 is connected with the waste heat boiler 5 through a pipeline, and the desalted water after deaeration by the deaerator 8 is supplied to the waste heat boiler 5 for utilization, so as to realize recycling of the desalted water.

[0044] In some embodiments, the steam exhaust generator 1 comprises a first steam exhaust generator 11 and a second steam exhaust generator 12, the first steam exhaust generator 11 is connected with the steam pipe network 4 to obtain steam drain and generate low-temperature steam exhaust, and the second steam exhaust generator 12 is connected with the waste heat boiler 5 to obtain boiler sewage and generate low-temperature steam exhaust.

[0045] As shown in Figure 1 the steam exhaust generator 1 comprises a first steam exhaust generator 11 and a second steam exhaust generator 12, the inlet end of the first steam exhaust generator 11 is connected with the steam pipe network 4 to obtain steam drain, the steam drain is depressurized after entering the first steam exhaust generator 11 to generate low-temperature steam exhaust, the inlet end of the second steam exhaust generator 12 is connected with the waste heat boiler 5 through a pipeline to obtain boiler sewage, and the boiler sewage is depressurized after entering the second steam exhaust generator 12 to generate low-temperature steam exhaust.

[0046] Preferably, the inlet end of the first steam exhaust generator 11 and the inlet end of the second steam exhaust generator 12 are both provided with an inlet valve, the outlet end of the first steam exhaust generator 11 and the outlet end of the second steam exhaust generator 12 are both provided with an outlet valve, and the first steam exhaust generator 11 and the second steam exhaust generator 12 are both provided with a safety vent.

[0047] The first steam exhaust generator 11 is used to accept and process steam drain, the receiving amount of the steam drain is controlled through the inlet valve of the first steam exhaust generator 11, the amount of low-temperature steam exhaust generated by the steam drain is controlled through the outlet valve of the first steam exhaust generator 11, and the pressure in the first steam exhaust generator 11 is released through the safety vent of the first steam exhaust generator 11 when the pressure exceeds the warning pressure.

[0048] The second steam exhaust generator 12 is used to accept and process boiler sewage, the receiving amount of the boiler sewage is controlled through the inlet valve of the second steam exhaust generator 12, the amount of low-temperature steam exhaust generated by the boiler sewage is controlled through the outlet valve of the second steam exhaust generator 12, and the pressure in the second steam exhaust generator 12 is released through the safety vent of the second steam exhaust generator 12 when the pressure exceeds the warning pressure.

[0049] Thus, the steam drain and the boiler sewage are processed respectively, which facilitates the control and use of the waste heat recycling system and ensures the safe operation of the waste heat recycling system.

[0050] In some embodiments, the waste heat recovery device 2 comprises a first waste heat recovery device 21 and a second waste heat recovery device 22, the first waste heat recovery device 21 is arranged on the desalted water delivery pipe 3 and connected with the first exhaust steam generator 11, so that the low-temperature exhaust steam supplied by the first exhaust steam generator 11 exchanges heat with the desalted water delivered by the desalted water delivery pipe 3, and the second waste heat recovery device 22 is arranged on the desalted water delivery pipe 3 and connected with the second exhaust steam generator 12, so that the low-temperature exhaust steam supplied by the second exhaust steam generator 12 exchanges heat with the desalted water delivered by the desalted water delivery pipe 3.

[0051] As shown in Figure 1 The waste heat recovery device 2 comprises a first waste heat recovery device 21 and a second waste heat recovery device 22, and each of the first waste heat recovery device 21 and the second waste heat recovery device 22 is provided with an outer shell, a first heat exchange cavity, a second heat exchange cavity, a condensate water outlet and a non-condensable steam outlet.

[0052] The second heat exchange cavities of the first waste heat recovery device 21 and the second waste heat recovery device 22 are arranged on the desalted water delivery pipe 3 for the passage of desalted water.

[0053] The inlet end of the first heat exchange cavity of the first waste heat recovery device 21 is connected with the outlet end of the first exhaust steam generator 11 through a pipeline, so as to obtain the low-temperature exhaust steam discharged by the first exhaust steam generator 11 and exchange heat with the desalted water in the second heat exchange cavity of the first waste heat recovery device 21.

[0054] The inlet end of the first heat exchange cavity of the second waste heat recovery device 22 is connected with the outlet end of the second exhaust steam generator 12 through a pipeline, so as to obtain the low-temperature exhaust steam discharged by the second exhaust steam generator 12 and exchange heat with the desalted water in the second heat exchange cavity of the second waste heat recovery device 22.

[0055] Thus, by using the low-temperature exhaust steam generated by the steam drain and the low-temperature exhaust steam generated by the boiler sewage through the first waste heat recovery device 21 and the second waste heat recovery device 22 respectively, the control and use of the waste heat recovery and utilization system are facilitated, and the safe operation of the waste heat recovery and utilization system is ensured. At the same time, the desalted water delivered by the desalted water delivery pipe 3 is exchanged heat twice to raise the temperature, the waste heat of the steam drain and the boiler sewage is fully utilized, and the temperature of the desalted water after being raised is ensured.

[0056] The condensate water outlets of the first waste heat recovery device 21 and the second waste heat recovery device 22 are connected with the condensate water recovery device 6 through pipelines, so as to receive and store the condensate water generated by the first waste heat recovery device 21 and the second waste heat recovery device 22 through the condensate water recovery device 6 at the same time, and ensure the full recovery of the condensate water.

[0057] The non-condensable steam outlet of the first waste heat recovery device 21 and the non-condensable steam outlet of the second waste heat recovery device 22 are connected to the negative pressure device 7 through pipelines to improve the low-temperature steam intake rate and heat exchange efficiency of the first waste heat recovery device 21 and the second waste heat recovery device 22.

[0058] In some embodiments, the first waste heat recovery device 21 and the second waste heat recovery device 22 are connected in series and / or in parallel on the desalted water conveying pipe 3.

[0059] Specifically, the second heat exchange cavity of the first waste heat recovery device 21 and the second heat exchange cavity of the second waste heat recovery device 22 can be connected in series on the desalted water conveying pipe 3, so that the desalted water is sequentially heat exchanged and warmed up to fully utilize the waste heat of the steam drain and the boiler blowdown and ensure the temperature of the desalted water after being warmed up.

[0060] The second heat exchange cavity of the first waste heat recovery device 21 and the second heat exchange cavity of the second waste heat recovery device 22 can also be connected in parallel on the desalted water conveying pipe 3, for example, the desalted water conveying pipe 3 is provided with a first branch and a second branch in parallel between the inlet end and the outlet end thereof, the second heat exchange cavity of the first waste heat recovery device 21 is arranged on the first branch, and the second heat exchange cavity of the second waste heat recovery device 22 is arranged on the second branch, so that the desalted water in the first branch and the second branch is simultaneously heat exchanged and warmed up, and then the desalted water in the first branch and the second branch is converged, the first branch and the second branch are preferably provided with flow valves, the flow valve of the first branch is adjusted corresponding to the low-temperature steam amount and temperature generated by the steam drain, and the flow valve of the second branch is adjusted corresponding to the low-temperature steam amount and temperature generated by the boiler blowdown, so as to fully utilize the waste heat of the steam drain and the boiler blowdown and ensure the temperature of the desalted water after being warmed up.

[0061] Preferably, the second heat exchange cavity of the first waste heat recovery device 21 and the second heat exchange cavity of the second waste heat recovery device 22 are connected in series and / or in parallel on the desalted water conveying pipe 3, as shown in FIG. 1. Figure 1 As shown in FIG. 1, the desalted water conveying pipe 3 includes a main path 31 and a branch path 32, along the conveying direction of the desalted water in the main path 31, the second heat exchange cavity of the second waste heat recovery device 22 and the second heat exchange cavity of the first waste heat recovery device 21 are arranged in sequence on the main path 31, the inlet end of the branch path 32 is connected to the main path 31 and located upstream of the second heat exchange cavity of the second waste heat recovery device 22, and the outlet end of the branch path 32 is connected to the main path 31 and located between the second heat exchange cavity of the second waste heat recovery device 22 and the second heat exchange cavity of the first waste heat recovery device 21.

[0062] A portion of the demineralized water in the demineralized water conveying pipe 3 undergoes heat exchange via the second waste heat recovery device 22 in the main pipeline 31, while another portion flows parallel to the portion of demineralized water that has passed through the second waste heat recovery device 22 via a branch pipeline. This mixture then flows along the main pipeline 31, where it is combined with the demineralized water that has undergone heat exchange with the second waste heat recovery device 22. The resulting mixture undergoes heat exchange via the first waste heat recovery device 21, thus achieving a high waste heat utilization rate and effective heat exchange and temperature increase for the demineralized water. Preferably, a flow regulating valve is provided between the inlet end of the branch pipeline 32 and the second waste heat recovery device 22 in the main pipeline 31, and a flow regulating valve is also provided in the branch pipeline 32.

[0063] In some embodiments, the condensate recovery device 6 includes a first condensate collection container 61 and a second condensate collection container 62. The inlet of the first condensate collection container 61 is connected to the condensate outlet of the first waste heat recovery device 21, the inlet of the second condensate collection container 62 is connected to the condensate outlet of the second waste heat recovery device 22, and the outlets of both the first condensate collection container 61 and the second condensate collection container 62 are connected to the deaerator 8.

[0064] like Figure 1 As shown, the condensate recovery device 6 includes a first condensate collection container 61 and a second condensate collection container 62. The inlet of the first condensate collection container 61 is connected to the condensate outlet of the first waste heat recovery device 21 via a pipeline to collect the condensate discharged from the first waste heat recovery device 21. The inlet of the second condensate collection container 62 is connected to the condensate outlet of the second waste heat recovery device 22 via a pipeline to collect the condensate discharged from the second waste heat recovery device 22. The outlets of both the first condensate collection container 61 and the second condensate collection container 62 are connected to the deaerator 8 to jointly supply condensate to the deaerator 8 for use as makeup water. The first condensate collection container 61 and the second condensate collection container 62 are preferably, but not limited to, tanks.

[0065] The first condensate collection container 61 and the second condensate collection container 62 are respectively set up to facilitate installation and to monitor the condensate discharge of the first waste heat recovery device 21 and the second waste heat recovery device 22 respectively.

[0066] In some embodiments, the condensate recovery device 6 further includes a condensate storage container 63, the outlet of the first condensate collection container 61 and the outlet of the second condensate collection container 62 are both connected to the inlet of the condensate storage container 63, and the outlet of the condensate storage container 63 is connected to the deaerator 8.

[0067] like Figure 1As shown, the outlets of the first condensate collection container 61 and the second condensate collection container 62 are both connected to the inlet of the condensate storage container 63 via pipelines. The condensate collected by the first condensate collection container 61 and the second condensate collection container 62 is supplied to the condensate storage container 63 for storage, giving the condensate recovery device 6 a high condensate storage capacity. The outlet of the condensate storage container 63 is connected to the deaerator 8 via a pipeline to supply the stored condensate to the deaerator 8 for makeup water use. In other words, the first condensate collection container 61 and the second condensate collection container 62 are connected in parallel at the inlet end of the condensate storage container 63, and are indirectly connected to the deaerator 8 through the condensate storage container 63.

[0068] It is understood that the condensate recovery device is not limited to including a condensate storage container. In other embodiments, the outlet of the first condensate collection container and the outlet of the second condensate collection container are directly or indirectly connected to the deaerator via a pump set.

[0069] Furthermore, the waste steam generator 1 is provided with a drain outlet. The drain outlet of the first waste steam generator 11 is connected to the condensate storage container 63 through a pipeline to discharge the residual steam condensate after generating low-temperature waste steam to the condensate storage container 63. The drain outlet of the second waste steam generator 12 is connected to the condensate storage container 63 through a pipeline to discharge the residual boiler drainage after generating low-temperature waste steam to the condensate storage container 63. The residual steam condensate and the residual boiler drainage are mixed with the condensate stored in the condensate storage container 63 and then supplied together to the deaerator 8 as makeup water.

[0070] In some embodiments, the condensate recovery device 6 further includes a first pump set 64, which is connected to the outlet of the first condensate collection container 61 and the outlet of the second condensate collection container 62 connected in parallel, and is also connected to the inlet of the condensate storage container 63.

[0071] like Figure 1 As shown, the first condensate collection container 61 and the second condensate collection container 62 are connected in parallel to the inlet of the first pump set 64 via pipelines. The outlet of the first pump set 64 is connected to the inlet of the condensate storage container 63 via a pipeline. The first pump set 64 pumps out the condensate collected in the first condensate collection containers 61 and 62 and supplies it to the condensate storage container 63. The opening and closing of the first pump set 64 controls the discharge from the first condensate collection containers 61 and 62 and the supply to the condensate storage container 63. The first pump set 64 preferably includes at least two pumps, with at least one pump in operation and at least one pump on standby, to ensure smooth operation of the first pump set 64.

[0072] In some embodiments, the oxygen-removing device 8 is provided with a non-condensed steam outlet for discharging non-condensed steam in the oxygen-removing device 8, and the negative pressure device 7 is connected to the non-condensed steam outlet to provide negative pressure to the non-condensed steam outlet.

[0073] As shown in Figure 1 , the oxygen-removing device 8 is preferably but not limited to a negative pressure oxygen-removing tank, and the oxygen-removing device 8 is provided with a non-condensed steam outlet for discharging non-condensed steam in the oxygen-removing device 8.

[0074] The inlet end of the negative pressure device 7 is connected to the oxygen-removing device 8 through a pipeline, and the negative pressure device 7 is preferably but not limited to a vacuum device such as a water ring vacuum pump and a water jet air ejector, and the negative pressure device 7 provides negative pressure to the non-condensed steam outlet to discharge the non-condensed steam in the oxygen-removing device 8.

[0075] The negative pressure device 7 assists in discharging non-condensed steam from the non-condensed steam outlet, and the discharge rate of the non-condensed steam is improved by negative pressure, thereby improving the oxygen-removing efficiency of the oxygen-removing device 8.

[0076] In some embodiments, the waste heat recycling system further comprises an oxygen-removed water container 10, and the inlet of the oxygen-removed water container 10 is connected to the outlet of the oxygen-removing device 8 to receive and store the oxygen-removed water supplied by the oxygen-removing device 8.

[0077] As shown in Figure 1 , the inlet of the oxygen-removed water container 10 is connected to the outlet of the oxygen-removing device 8, and the desalted water is oxygen-removed in the oxygen-removing device 8 to form oxygen-removed water, which is discharged from the outlet of the oxygen-removing device 8 and stored in the oxygen-removed water container 10 for stable supply and utilization of the oxygen-removed water.

[0078] In some embodiments, the waste heat recycling system further comprises a water supply pipe 30 connected between the outlet of the oxygen-removed water container 10 or the outlet of the oxygen-removing device 8 and the waste heat boiler 5 to supply the oxygen-removed water to the waste heat boiler 5.

[0079] As shown in Figure 1 , the outlet of the oxygen-removed water container 10 is connected to the waste heat boiler 5 through the water supply pipe 30 to supply the oxygen-removed water stored in the oxygen-removed water container 10 to the waste heat boiler 5 for utilization, thereby reducing the cost of feed water of the waste heat boiler 5.

[0080] Preferably, the waste heat recycling system further comprises a second pump group 20 provided on the water supply pipe 30 to supply the oxygen-removed water stored in the oxygen-removed water container 10 to the waste heat boiler 5.

[0081] The second pump group 20 preferably comprises at least two water pumps, at least one of which is in operation and at least one of which is in standby, to ensure smooth operation of the second pump group 20.

[0082] It can be understood that the waste heat recycling system is not limited to setting the deoxygenated water container, and in other embodiments, the water supply pipe is connected between the outlet of the deaerator and the waste heat boiler.

[0083] In some embodiments, the waste heat recycling system further comprises a backflow pipe 40 connected between the outlet of the deoxygenated water container 10 or the outlet of the deaerator 8 and the deaerator 8, for backflowing the deoxygenated water to the deaerator 8.

[0084] As shown in Figure 1 the outlet of the deoxygenated water container 10 is also connected to the backflow port of the deaerator 8 through the backflow pipe 40, for backflowing the deoxygenated water stored in the deoxygenated water container 10 to the deaerator 8 for repeated deoxygenation, so as to improve the deoxygenation rate.

[0085] Preferably, the inlet of the backflow pipe 40 is connected to the water supply pipe 30 and downstream of the second pump set 20 along the water flow direction in the water supply pipe 30, and the outlet of the backflow pipe 40 is connected to the backflow port of the deaerator 8, the second pump set 20 supplies most of the deoxygenated water in the deoxygenated water container 10 to the waste heat boiler 5, and a small part of the deoxygenated water in the deoxygenated water container 10 is backflowed to the deaerator 8.

[0086] It can be understood that the waste heat recycling system is not limited to setting the deoxygenated water container, and in other embodiments, the water supply pipe is connected between the outlet of the deaerator and the backflow port of the deaerator.

[0087] It can be understood that the deaerator is not limited to being provided with the backflow port, and in other embodiments, the backflow pipe is connected to the inlet of the deaerator.

[0088] The waste heat recycling system is preferably but not limited to be applied to non-ferrous smelting plants.

[0089] In the description of the present application, it should be understood that the terms "first", "second" are only used to distinguish, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0090] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0091] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0092] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A waste heat recovery system characterized by, The application relates to a waste heat recovery system, which comprises a steam trap (1), a waste heat recovery device (2) and a desalted water conveying pipe (3), the steam trap (1) is connected with a steam pipe network (4) and a waste heat boiler (5) respectively to obtain steam drain of the steam pipe network (4) and boiler sewage of the waste heat boiler (5) and generate low-temperature steam trap, the waste heat recovery device (2) is arranged on the desalted water conveying pipe (3) and connected with the steam trap (1) to make the low-temperature steam trap supplied by the steam trap (1) exchange heat with the desalted water conveyed by the desalted water conveying pipe (3). The waste heat recovery device (2) is provided with a condensate water outlet for discharging condensate water generated by the low-temperature steam trap.

2. The waste heat recovery system according to claim 1, wherein The waste heat recovery system further comprises a condensate water recovery device (6) connected with the condensate water outlet to receive the condensate water discharged by the condensate water outlet. The waste heat recovery device (2) is provided with a non-condensable steam outlet for discharging non-condensable steam after the low-temperature steam trap exchanges heat.

3. The waste heat recovery system of claim 2, wherein The waste heat recovery system further comprises a negative pressure device (7) connected with the non-condensable steam outlet to provide negative pressure for the non-condensable steam outlet. The waste heat recovery system further comprises a deaerator (8) connected with an outlet end of the desalted water conveying pipe (3) to deaerate the desalted water, and the condensate water recovery device (6) is connected with the deaerator (8) to supply the received condensate water to the deaerator (8).

4. The waste heat recovery system of claim 3, wherein The steam trap (1) comprises a first steam trap (11) connected with the steam pipe network (4) to obtain steam drain and generate low-temperature steam trap and a second steam trap (12) connected with the waste heat boiler (5) to obtain boiler sewage and generate low-temperature steam trap.

5. The waste heat recovery system of claim 4, wherein The waste heat recovery device (2) comprises a first waste heat recovery device (21) arranged on the desalted water conveying pipe (3) and connected with the first steam trap (11) to make the low-temperature steam trap supplied by the first steam trap (11) exchange heat with the desalted water conveyed by the desalted water conveying pipe (3) and a second waste heat recovery device (22) arranged on the desalted water conveying pipe (3) and connected with the second steam trap (12) to make the low-temperature steam trap supplied by the second steam trap (12) exchange heat with the desalted water conveyed by the desalted water conveying pipe (3). The first waste heat recovery device (21) and the second waste heat recovery device (22) are connected in series and / or in parallel on the desalted water conveying pipe (3).

6. The waste heat recovery system of claim 5, wherein ​ 7. The waste heat recovery system of claim 5, wherein The condensate water recovery device (6) comprises a first condensate water collecting container (61) and a second condensate water collecting container (62), the inlet of the first condensate water collecting container (61) is connected with the condensate water outlet of the first waste heat recovery device (21), the inlet of the second condensate water collecting container (62) is connected with the condensate water outlet of the second waste heat recovery device (22), and the outlet of the first condensate water collecting container (61) and the outlet of the second condensate water collecting container (62) are both connected with the deaerator (8).

8. The waste heat recovery system of claim 7, wherein, The condensate water recovery device (6) further comprises a condensate water storage container (63), the outlet of the first condensate water collecting container (61) and the outlet of the second condensate water collecting container (62) are both connected with the inlet of the condensate water storage container (63), and the outlet of the condensate water storage container (63) is connected with the deaerator (8).

9. The waste heat recovery system of claim 8, wherein, The condensate water recovery device (6) further comprises a first pump group (64), the first pump group (64) is connected with the outlet of the first condensate water collecting container (61) and the outlet of the second condensate water collecting container (62) in parallel, and the first pump group (64) is connected with the inlet of the condensate water storage container (63).

10. The waste heat recovery system of claim 5, wherein, The non-condensing steam outlet of the first waste heat recovery device (21) and the non-condensing steam outlet of the second waste heat recovery device (22) are both connected with the negative pressure device (7).

11. The waste heat recovery system of claim 4, wherein, The deaerator (8) is provided with a non-condensing steam discharge port for discharging non-condensing steam in the deaerator (8), and the negative pressure device (7) is connected with the non-condensing steam discharge port to provide negative pressure for the non-condensing steam discharge port.

12. The waste heat recovery system of claim 4, wherein, The waste heat recovery system further comprises a deaerated water container (10), the inlet of the deaerated water container (10) is connected with the outlet of the deaerator (8) to receive and store deaerated water supplied by the deaerator (8); and / or The waste heat recovery system further comprises at least one of a water supply pipe (30) and a backflow pipe (40), the water supply pipe (30) is connected between the outlet of the deaerated water container (10) or the outlet of the deaerator (8) and the waste heat boiler (5) to supply deaerated water to the waste heat boiler (5), and the backflow pipe (40) is connected between the outlet of the deaerated water container (10) or the outlet of the deaerator (8) and the deaerator (8) to backflow deaerated water to the deaerator (8).

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