Dead steam waste heat recovery device of sludge drying machine

Abstract

The utility model discloses a waste steam waste heat recovery device of a sludge drying machine, which relates to the technical field of waste heat recovery and comprises a circulating water heat exchanger and a waste steam pipeline connected with the circulating water heat exchanger, and the circulating water heat exchanger is connected with a waste steam discharge port of the sludge drying machine through the waste steam pipeline. The circulating water heat exchanger is also connected with a condensed water heat exchanger through a pipeline, the circulating water heat exchanger and the condensed water heat exchanger are jointly connected to a dead steam discharge port of the sludge drying machine through pipelines, and the condensed water heat exchanger is connected with a circulating water return pipeline, a circulating water supply pipeline and a first spraying pipeline. According to the utility model, the heat of the dead steam is recovered, so that the heat of the dead steam is prevented from being completely taken away by the cooling tower, the circulation volume of sewage and cooling water is reduced, and the effects of saving electricity, water and chemicals are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery, and specifically relates to a waste heat recovery device for exhaust steam of a sludge drying machine. Background Art

[0002] The heat source used in the sludge drying process is superheated steam. The superheated steam evaporates the water in the sludge after passing through the dryer. This evaporated water is the sludge drying exhaust steam.

[0003] At present, the exhaust steam heat is finally taken away by the cooling tower, so this part of the exhaust steam heat is directly wasted. Increasing the cooling process of the cooling tower directly increases the power consumption, water replenishment and water replenishment dosage of the cooling tower, which directly increases the cost of sludge drying.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a sludge drying machine exhaust steam waste heat recovery device to achieve the desired purpose.

[0006] In order to solve the above technical problems, the utility model provides a sludge dryer exhaust steam waste heat recovery device, including a circulating water heat exchanger and an exhaust steam pipeline connected to the circulating water heat exchanger, the circulating water heat exchanger is connected to the exhaust steam discharge port of the sludge dryer through the exhaust steam pipeline, the circulating water heat exchanger is also connected to a condensate water heat exchanger through a pipeline, the circulating water heat exchanger and the condensate water heat exchanger are connected to the exhaust steam discharge port of the sludge dryer through a pipeline, and the condensate water heat exchanger is connected to a circulating water return pipeline, a circulating water supply pipeline and a first spray pipeline.

[0007] Furthermore, the condensate heat exchanger is connected to a sewage tank, a first sewage pump and a second sewage pump through a pipeline, and the first sewage pump and the second sewage pump are both connected to the sewage tank through a pipeline.

[0008] Furthermore, the condensate heat exchanger is connected to a spray pump via a pipeline, and the spray pump is connected to a second spray pipeline of the spray heat exchanger, a heat exchange spray pipeline and an electric three-way valve group.

[0009] Furthermore, the condensate heat exchanger is connected to an induced draft fan via a pipeline, and an input end of the induced draft fan is connected to an air extraction pipeline.

[0010] Furthermore, the circulating water heat exchanger is connected to a condensate water supply pipe and a condensate water return pipe through pipes.

[0011] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0012] In the utility model, the exhaust steam generated by sludge drying is used to exchange heat with condensed water to increase the temperature of the condensed water, thereby recovering the heat of the exhaust steam, avoiding that all the heat of the exhaust steam is taken away by the cooling tower, reducing the circulation volume of sewage and cooling water, and achieving the effect of saving electricity, water and medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0014] Figure 1 This is a process flow chart of the utility model.

[0015] Numbers in the figure: 1. Circulating water heat exchanger; 2. Condensate heat exchanger; 3. Circulating water return pipe; 4. Circulating water supply pipe; 5. First spray pipe; 6. Air extraction pipe; 7. Induced draft fan; 8. Spray heat exchanger; 9. Second spray pipe; 10. Heat exchange spray pipe; 11. Spray pump; 12. First sewage pump; 13. Second sewage pump; 14. Condensate supply pipe; 15. Condensate return pipe; 16. Exhaust steam pipe.

[0016] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1 As shown, the utility model provides a waste heat recovery device for exhaust steam of a sludge dryer.

[0021] Specifically, by Figure 1 It is provided, comprising a circulating water heat exchanger 1 and an exhaust steam pipe 16 connected to the circulating water heat exchanger 1, the circulating water heat exchanger 1 is connected to the exhaust steam discharge port of the sludge dryer through the exhaust steam pipe 16, the circulating water heat exchanger 1 is connected to a condensate water supply pipe 14 and a condensate water return pipe 15 through a pipe, the circulating water heat exchanger 1 is also connected to a condensate water heat exchanger 2 through a pipe, the circulating water heat exchanger 1 and the condensate water heat exchanger 2 are connected to the exhaust steam discharge port of the sludge dryer through a pipe, and the condensate water heat exchanger 2 is connected to a circulating water return pipe 3, a circulating water supply pipe 4 and a first spray pipe 5.

[0022] In the utility model, the existing production process adopts a spray tower to spray the water evaporated from the sludge. The spray water used in the spray tower is heated by the water and then needs to be cooled by cooling water. The added cooling system requires additional consumption of electricity, water replenishment and water replenishment dosage.

[0023] The utility model recovers the heat of the exhaust steam, thereby preventing all the heat of the exhaust steam from being taken away by the cooling tower, reducing the circulation volume of sewage and cooling water, and achieving the effects of saving electricity, water and medicine.

[0024] The circulating water heat exchanger 1 is a device that transfers heat through circulating water. During operation, deposits (dirt) often accumulate on the metal surface of the circulating water heat exchanger. The deposits not only have low thermal conductivity, but also reduce the cross-sectional area of ​​the cooling water channel and the cooling water flux in the heat exchanger. The deposits cover the metal surface, creating the necessary conditions for under-scale corrosion. Therefore, after the circulating water system has been running for a long time, the circulating water system heat exchanger often becomes clogged or leaks, causing the heat exchange effect of the water cooler to decrease, resulting in an increase in the outlet temperature, affecting the safe production and operation of the device, increasing unnecessary cost consumption, and not conducive to energy saving and consumption reduction;

[0025] The condensate heat exchanger 2 can recover the waste heat of condensate, improve energy utilization, and reduce energy waste. In industrial production, the condensate heat exchanger is usually used to recover the heat in the condensate discharged by equipment such as boilers or power plants, and transfer it to the medium that needs to be heated, so as to achieve the purpose of energy saving and emission reduction;

[0026] During the operation of the circulating water heat exchanger 1 and the condensate water heat exchanger 2, sediments (dirt) are easily attached to their metal surfaces. These sediments have low thermal conductivity and will affect the heat exchange effect of the heat exchanger. In order to solve this problem, this scheme adopts the method of spraying the circulating water heat exchanger for cleaning. Spray cleaning can effectively remove the sediment on the surface of the heat exchanger, improve the heat exchange efficiency of the heat exchanger, and also play a role in anti-scaling and descaling.

[0027] Furthermore, as a specific implementation of the utility model, the utility model provides a sludge drying machine exhaust steam waste heat recovery device.

[0028] Specifically, Figure 1 It is shown that the condensate heat exchanger 2 is connected to a sewage tank, a first sewage pump 12 and a second sewage pump 13 through a pipeline, and the first sewage pump 12 and the second sewage pump 13 are both connected to the sewage tank through a pipeline.

[0029] Furthermore, as another specific implementation of the utility model, the utility model provides a sludge drying machine exhaust steam waste heat recovery device.

[0030] Specifically, Figure 1 It is shown that the condensate heat exchanger 2 is connected to a spray pump 11 through a pipeline, and the spray pump 11 is connected to the second spray pipeline 9 of the spray heat exchanger 8, the heat exchange spray pipeline 10 and the electric three-way valve group.

[0031] Furthermore, as a specific implementation of the present invention, the present invention provides a sludge drying machine exhaust steam waste heat recovery device.

[0032] Specifically, Figure 1 It is shown that the condensate heat exchanger 2 is connected to an induced draft fan 7 through a pipeline, and an input end of the induced draft fan 7 is connected to an air extraction pipeline 6.

[0033] Figure 1 The graphic symbols in are shown in Table 1:

[0034]

[0035] Table 1

[0036] The working principle is as follows:

[0037] S1. The exhaust steam generated by sludge drying and the condensed water in the steam turbine power generation system are heat-exchanged in the circulating water heat exchanger 1 through the exhaust steam pipeline 16, and the condensed water is heated while the exhaust steam is cooled into high-temperature sewage.

[0038] S2. The high-temperature sewage after passing through the circulating water heat exchanger 1 and the circulating water of the cooling tower exchange heat in the condensate water heat exchanger 2 to reduce the temperature to meet the temperature requirements of the exhaust steam condensate treatment.

[0039] S3. The non-condensable gas in the exhaust steam that passes through the condensate heat exchanger 2 is connected to the air extraction duct 6 through the induced draft fan 7.

[0040] S4. The exhaust steam condensed by the condensate heat exchanger 2 is stored in the sewage tank. When the sewage is stored to a certain amount, the first sewage pump 12 and the second sewage pump 13 cooperate to pump it out and discharge it.

[0041] S5, the spray pump 11 regularly draws out the exhaust steam condensate from the sewage tank to flush the pipeline and heat exchanger.

[0042] In step S2 , the step further includes adding a branch line on the pipeline between the condensate heat exchanger 2 and the circulating water heat exchanger 1 , and connecting the branch line to the exhaust steam pipeline 16 in front of the circulating water heat exchanger 1 .

[0043] In step S5, the spray pipeline after the spray pump 11 is connected to an electric three-way valve group, which is connected to the heat exchanger and the exhaust steam pipeline 16 respectively.

[0044] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A sludge dryer exhaust steam waste heat recovery device, comprising a circulating water heat exchanger (1) and an exhaust steam pipeline (16) connected to the circulating water heat exchanger (1), wherein the circulating water heat exchanger (1) is connected to the exhaust steam discharge port of the sludge dryer through the exhaust steam pipeline (16), characterized in that: The circulating water heat exchanger (1) is also connected to a condensate water heat exchanger (2) via a pipeline; the circulating water heat exchanger (1) and the condensate water heat exchanger (2) are connected to a waste steam discharge port of a sludge dryer via a pipeline; the condensate water heat exchanger (2) is connected to a circulating water return pipeline (3), a circulating water supply pipeline (4) and a first spray pipeline (5).

2. The exhaust steam waste heat recovery device of a sludge drying machine according to claim 1 is characterized in that: The condensate heat exchanger (2) is connected to a sewage tank, a first sewage pump (12) and a second sewage pump (13) via a pipeline, and the first sewage pump (12) and the second sewage pump (13) are both connected to the sewage tank via a pipeline.

3. The exhaust steam waste heat recovery device of a sludge drying machine according to claim 1 is characterized in that: The condensate heat exchanger (2) is connected to a spray pump (11) via a pipeline, and the spray pump (11) is connected to a second spray pipeline (9) of the spray heat exchanger (8), a heat exchange spray pipeline (10) and an electric three-way valve group.

4. The exhaust steam waste heat recovery device of a sludge drying machine according to claim 1 is characterized in that: The condensate heat exchanger (2) is connected to an induced draft fan (7) via a pipeline, and the input end of the induced draft fan (7) is connected to an air extraction pipeline (6).

5. The exhaust steam waste heat recovery device of a sludge drying machine according to claim 1, characterized in that: The circulating water heat exchanger (1) is connected to a condensate water supply pipeline (14) and a condensate water return pipeline (15) via pipelines.

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