Waste heat boiler condensing system

Abstract

The utility model discloses a waste heat boiler condensing system which comprises a waste heat boiler, a temperature and pressure reducer, a positive pressure condenser, a deaerator and a water feeding pump, the waste heat boiler is used for waste heat recovery and steam production, and the temperature and pressure reducer is connected to the downstream of the waste heat boiler and used for temperature and pressure reduction of the steam. The temperature and pressure reducer is used for generating steam, the positive pressure condenser is connected to the downstream of the temperature and pressure reducer and used for condensing the steam and generating condensed water, and the deaerator is connected to the downstream of the positive pressure condenser and used for removing oxygen in the condensed water. The water feeding pump is connected between the deaerator and the waste heat boiler, and the water feeding pump is used for conveying the condensed water without oxygen back to the waste heat boiler. The condensing system of the waste heat boiler is simple in structure, small in occupied space and occupied area, low in overall system energy consumption and capable of reducing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and in particular to a waste heat boiler condensing system. Background Art

[0002] In nonferrous smelting plants, waste heat boilers produce a large amount of steam while recovering waste heat. This part of steam is usually passed into the steam turbine to generate power. However, when the steam turbine fails or the steam is insufficient, this part of steam needs to enter the bypass condenser for condensation to achieve the purpose of recovering condensate. However, the design of using condensers to recover condensate in the prior art has problems such as complex system, large space and floor space occupied, and high overall energy consumption. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the embodiment of the utility model proposes a waste heat boiler condensing system, which has a simple structure, occupies a small space and floor area, has low overall system energy consumption, and reduces costs.

[0005] The waste heat boiler condensing system of the utility model embodiment includes:

[0006] A waste heat boiler, which is used to recover waste heat and produce steam;

[0007] A temperature and pressure reducing device, which is connected to the downstream of the waste heat boiler and is used to reduce the temperature and pressure of the steam;

[0008] A positive pressure condenser, the positive pressure condenser is connected to the downstream of the temperature and pressure reducing device, and the positive pressure condenser is used to condense the steam and generate condensed water;

[0009] A deaerator, the deaerator is connected to the downstream of the positive pressure condenser, and the deaerator is used to remove oxygen from the condensed water;

[0010] A feed water pump is connected between the deaerator and the waste heat boiler, and is used to return the condensed water from which oxygen has been removed to the waste heat boiler.

[0011] In some embodiments, the positive pressure condenser includes a connected condensation section and a subcooling section, the first inlet of the positive pressure condenser is arranged in the condensation section, the first outlet of the positive pressure condenser is arranged in the subcooling section, the first inlet is connected to the temperature and pressure reducing device, and the first outlet is connected to the deaerator.

[0012] In some embodiments, the condensation section is disposed above the supercooling section.

[0013] In some embodiments, the first inlet is disposed at a top side of the condensation section, and the first outlet is disposed at a bottom side of the supercooling section.

[0014] In some embodiments, the positive pressure condenser includes a first connecting pipe and a second connecting pipe, both of which are connected between the condensation section and the subcooling section, the first connecting pipe is used to supply the condensed water from the condensation section to the subcooling section, and the second connecting pipe is used to supply circulating water from the subcooling section to flow into the condensation section.

[0015] In some embodiments, a diameter of the first connecting tube is smaller than a diameter of the second connecting tube.

[0016] In some embodiments, the positive pressure condenser is provided with a second inlet and a second outlet, the second inlet is provided at the bottom side of the subcooling section, the second outlet is provided at the top side of the condensing section, the second inlet and the second outlet are located at one end of the positive pressure condenser, and the second connecting pipe is located at the other end of the positive pressure condenser.

[0017] In some embodiments, the positive pressure condenser includes a plurality of pillars, each of which is connected between the condensation section and the subcooling section, and the plurality of pillars are arranged at intervals along the circumference of the positive pressure condenser, and the first connecting pipe is located in the area surrounded by the plurality of pillars.

[0018] In some embodiments, the positive pressure condenser includes a plurality of legs, the number of the legs is the same as the number of the pillars, the plurality of legs are connected to the supercooling section and extend downwardly of the supercooling section, and the plurality of legs and the plurality of pillars are arranged one by one opposite to each other in the up and down directions.

[0019] In some embodiments, a bypass pipe is included, one end of which is connected to the outlet of the water feed pump, and the other end of which is connected to the temperature and pressure reducing device.

[0020] Beneficial effects: The waste heat boiler condensing system of the utility model embodiment has a simple structure, occupies a small space and floor area, has low overall system energy consumption, and also reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the waste heat boiler condensing system of the embodiment of the utility model.

[0022] Figure 2 yes Figure 1 Schematic diagram of the main view of the medium positive pressure condenser.

[0023] Figure 3 yes Figure 1Schematic side view of the medium positive pressure condenser.

[0024] Reference numerals:

[0025] Waste heat boiler 1;

[0026] Temperature and pressure reducing device 2;

[0027] Positive pressure condenser 3; condensation section 31; subcooling section 32; first inlet 33; first outlet 34; first connecting pipe 35; second connecting pipe 36; second inlet 37; second outlet 38; support 39; support leg 310;

[0028] Deaerator 4;

[0029] Feed water pump 5;

[0030] Bypass pipe 6. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0032] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0033] In the existing technical solutions, a negative pressure condenser is generally used to condense steam. The negative pressure condenser requires a water ring vacuum pump to maintain the vacuum degree, a condensate pump to pressurize the condensate, and a two-stage temperature and pressure reducer 2 to reduce the steam parameters entering the condenser. These additionally configured equipment increase the complexity and system energy consumption of the overall condensation system, and also make the overall condensation system high in investment and occupy a large area.

[0034] like Figure 1 As shown, the waste heat boiler condensing system of the embodiment of the utility model includes a waste heat boiler 1, a temperature and pressure reducer 2, a positive pressure condenser 3, a deaerator 4 and a feed water pump 5.

[0035] The waste heat boiler 1, the desuperheater 2, the positive pressure condenser 3, the deaerator 4, and the feed water pump 5 are connected in sequence through corresponding pipelines, wherein the waste heat boiler 1 is used for waste heat recovery and steam production. The desuperheater 2 is connected to the downstream of the waste heat boiler 1 through a pipeline, and the desuperheater 2 is used to reduce the temperature and pressure of the steam discharged from the waste heat boiler 1.

[0036] The positive pressure condenser 3 is connected to the downstream of the temperature and pressure reducing device 2 through corresponding pipelines, and the positive pressure condenser 3 is used to condense the steam and generate condensate. The deaerator 4 is connected to the downstream of the positive pressure condenser 3 through corresponding pipelines, and the deaerator 4 is used to remove oxygen from the condensate. The feed water pump 5 is connected between the deaerator 4 and the waste heat boiler 1 through corresponding pipelines, and the feed water pump 5 is used to return the condensate from which oxygen is removed to the waste heat boiler 1.

[0037] It should be noted that the positive pressure condenser of the present invention is relative to the negative pressure condenser. Compared with the case where the internal pressure is negative pressure, the internal pressure of the positive pressure condenser of the embodiment of the present invention can be regarded as positive pressure.

[0038] When the waste heat boiler condensing system of the utility model is in use, the 5.0MPa, 265℃ steam generated by the waste heat boiler 1 passes through the temperature reducer 2, becomes 0.6MPa, 165℃ steam and directly enters the positive pressure condenser. The parameters of the condensed water generated by the positive pressure condenser 3 are 0.6MPa, 80℃, and then the condensed water enters the deaerator 4 for heating and deoxygenation by its own pressure. The parameters of the deoxygenated water generated by the deaerator 4 are 0.02MPa, 104℃. The deoxygenated water is pressurized by the feed water pump 5 and sent to the drum of the waste heat boiler 1, thereby forming a complete steam-water circulation system.

[0039] The condenser of the waste heat boiler condensing system of the embodiment of the utility model is a positive pressure condenser. Compared with the negative pressure condenser used in the prior art, the condenser of the utility model has a small heat exchange area, a small volume and a lower cost.

[0040] Secondly, the gas condenser of the utility model does not need to set up additional components such as water jetting and exhaust system, water ring vacuum pump, condensate pump, etc., which saves power consumption as a whole.

[0041] In addition, the gas condensation system of the utility model is simpler, the equipment is reduced, and the operation and management are convenient.

[0042] In some embodiments, Figure 2 and Figure 3 As shown, the positive pressure condenser 3 includes a connected condensation section 31 and a subcooling section 32, a first inlet 33 of the positive pressure condenser 3 is arranged at the condensation section 31, a first outlet 34 of the positive pressure condenser 3 is arranged at the subcooling section 32, the first inlet 33 is connected to the temperature and pressure reducing device 2, and the first outlet 34 is connected to the deaerator 4.

[0043] When in use, the steam discharged from the temperature reducing and pressure reducing device 2 can first be discharged into the condensation section 31 through the first inlet 33, and then discharged into the supercooling section 32 after being condensed into condensed water in the condensation section 31. The condensed water will be recooled in the supercooling section 32, and then the condensed water in the supercooling section 32 will be discharged from the first outlet 34 and flow into the deaerator 4. The two-stage design of the positive pressure condenser can fully guarantee the condensation effect, and can also realize sufficient heat exchange with the circulating water, thereby improving the condensation heat exchange effect.

[0044] In some embodiments, Figure 2 and Figure 3 As shown, the condensation section 31 is arranged above the supercooling section 32. Thus, the condensed water formed in the condensation section 31 can be discharged into the supercooling section 32 by itself under the action of gravity.

[0045] In some embodiments, the first inlet 33 is disposed on the top side of the condensation section 31, and the first outlet 34 is disposed on the bottom side of the supercooling section 32. This facilitates the downward transportation of the condensed water.

[0046] In some embodiments, the positive pressure condenser includes a first connecting pipe 35 and a second connecting pipe 36, both of which are connected between the condensing section 31 and the supercooling section 32, for example. Figure 2 As shown, the first connecting tube 35 and the second connecting tube 36 can both be circular tubes, and the first connecting tube 35 and the second connecting tube 36 can both extend in the up and down directions, the top ends of the first connecting tube 35 and the second connecting tube 36 can both be connected to the condensation section 31, and the bottom ends of the first connecting tube 35 and the second connecting tube 36 can both be connected to the supercooling section 32.

[0047] When in use, the first connecting pipe 35 is used to allow condensed water formed in the condensing section 31 to flow from the condensing section 31 to the supercooling section 32, and the second connecting pipe 36 is used to allow circulating water to flow from the supercooling section 32 to the condensing section 31. The condensation of steam and the re-cooling of condensed water can be achieved by heat exchange between circulating water, steam and condensed water.

[0048] In some embodiments, the diameter of the first connecting pipe 35 is smaller than the diameter of the second connecting pipe 36. Thus, the flow rate of the circulating water from the supercooling section 32 to the condensing section 31 can be relatively large, thereby fully ensuring the condensation and cooling effect on the steam.

[0049] In some embodiments, the positive pressure condenser is provided with a second inlet 37 and a second outlet 38, the second inlet 37 is provided at the bottom side of the supercooling section 32, the second outlet 38 is provided at the top side of the condensing section 31, the second inlet 37 and the second outlet 38 are located at one end of the positive pressure condenser, and the second connecting pipe 36 is located at the other end of the positive pressure condenser.

[0050] For example, Figure 2As shown, the second inlet 37 can be arranged at the left end of the supercooling section 32, the second outlet 38 can be arranged at the left end of the condensing section 31, the bottom end of the second connecting pipe 36 can be connected to the right end of the supercooling section 32, and the top end of the second connecting pipe 36 can be connected to the right end of the condensing section 31. Thus, the circulating water can completely flow through the cooling section 32 and the condensing section 31, thereby fully ensuring the adequacy of the condensation heat exchange.

[0051] In some embodiments, the positive pressure condenser includes a plurality of struts 39 , each of which is connected between the condensation section 31 and the subcooling section 32 , and the plurality of struts 39 are arranged at intervals along the circumference of the positive pressure condenser, and the first connecting pipe 35 is located in the area surrounded by the plurality of struts 39 .

[0052] For example, four pillars 39 may be provided, and the four pillars 39 may be round columns, square columns, etc. The four pillars 39 may be generally connected to the middle of the condensation section 31 and the supercooling section 32, wherein two pillars 39 may be provided at the front side of the positive pressure condenser and may be arranged at intervals in the left and right directions, and the other two pillars 39 may be provided at the rear side of the positive pressure condenser and may be arranged at intervals in the left and right directions. The pillars 39 may play a role in supporting and separating the condensation section 31 and the supercooling section 32.

[0053] The first connecting pipe 35 can be enclosed in a space area formed by four pillars 39 , and the four pillars 39 can protect the first connecting pipe 35 .

[0054] In some embodiments, the positive pressure condenser includes multiple legs 310, the number of legs 310 is the same as the number of pillars 39, the multiple legs 310 are all connected to the supercooling section 32 and extend downwardly from the supercooling section 32, and the multiple legs 310 and the multiple pillars 39 are arranged one by one opposite to each other in the up and down directions.

[0055] For example, Figure 2 and Figure 3 As shown, four legs 310 can be provided, and the four legs 310 can be fixed on the lower half of the supercooling section 32. The four legs 310 can be arranged one by one opposite to the four pillars 39 in the up and down directions. The first outlet 34 can be located in the space area surrounded by the four legs 310. When in use, the four legs 310 can play a supporting role, thereby facilitating the placement of the positive pressure condenser 3.

[0056] In some embodiments, the waste heat boiler condensing system includes a bypass pipe 6, one end of which is connected to the outlet of the feed water pump 5, and the other end of which is connected to the temperature and pressure reducing device 2. Figure 1As shown, one end of the bypass pipe 6 can be connected to the pipeline between the feed water pump 5 and the waste heat boiler 1, and the other end of the bypass pipe 6 can be connected to the temperature reducing and pressure reducing device 2, so that the condensed water delivered by the feed water pump 5 can be directly delivered to the temperature reducing and pressure reducing device 2, so that the overall cooling can be achieved with the help of the condensed water.

[0057] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A waste heat boiler condensing system, characterized in that: include: A waste heat boiler, which is used to recover waste heat and produce steam; A temperature and pressure reducing device, which is connected to the downstream of the waste heat boiler and is used to reduce the temperature and pressure of the steam; A positive pressure condenser, the positive pressure condenser is connected to the downstream of the temperature and pressure reducing device, and the positive pressure condenser is used to condense the steam and generate condensed water; A deaerator, the deaerator is connected to the downstream of the positive pressure condenser, and the deaerator is used to remove oxygen from the condensed water; A feed water pump is connected between the deaerator and the waste heat boiler, and is used to return the condensed water from which oxygen has been removed to the waste heat boiler.

2. The waste heat boiler condensing system according to claim 1, characterized in that: The positive pressure condenser includes a connected condensing section and a supercooling section. The first inlet of the positive pressure condenser is arranged at the condensing section, and the first outlet of the positive pressure condenser is arranged at the supercooling section. The first inlet is connected to the temperature and pressure reducing device, and the first outlet is connected to the deaerator.

3. The waste heat boiler condensing system according to claim 2, characterized in that: The condensation section is arranged above the supercooling section.

4. The waste heat boiler condensing system according to claim 3, characterized in that: The first inlet is arranged at the top side of the condensation section, and the first outlet is arranged at the bottom side of the supercooling section.

5. The waste heat boiler condensing system according to claim 3, characterized in that: The positive pressure condenser includes a first connecting pipe and a second connecting pipe, both of which are connected between the condensation section and the supercooling section. The first connecting pipe is used to supply the condensed water from the condensation section to the supercooling section, and the second connecting pipe is used to supply circulating water from the supercooling section to the condensation section.

6. The waste heat boiler condensing system according to claim 5, characterized in that: The diameter of the first connecting pipe is smaller than the diameter of the second connecting pipe.

7. The waste heat boiler condensing system according to claim 5, characterized in that: The positive pressure condenser is provided with a second inlet and a second outlet, the second inlet is arranged at the bottom side of the supercooling section, the second outlet is arranged at the top side of the condensing section, the second inlet and the second outlet are located at one end of the positive pressure condenser, and the second connecting pipe is located at the other end of the positive pressure condenser.

8. The waste heat boiler condensing system according to claim 5, characterized in that: The positive pressure condenser includes a plurality of pillars, each of which is connected between the condensation section and the subcooling section, and is arranged at intervals along the circumference of the positive pressure condenser. The first connecting pipe is located in an area surrounded by the plurality of pillars.

9. The waste heat boiler condensing system according to claim 8, characterized in that: The positive pressure condenser includes a plurality of legs, the number of the legs is the same as the number of the pillars, the plurality of legs are connected to the supercooling section and extend below the supercooling section, and the plurality of legs and the plurality of pillars are arranged one by one relative to each other in the up and down directions.

10. The waste heat boiler condensing system according to any one of claims 1 to 9, characterized in that: It comprises a bypass pipe, one end of which is connected to the outlet of the water supply pump, and the other end of which is connected to the temperature and pressure reducing device.

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