Energy-saving device for waste heat utilization

Abstract

This utility model discloses an energy-saving device for waste heat utilization, including a sludge dryer, a condensate tank, a flash evaporator, a desuperheating and pressure reducing device, a boiling valve, and an amine process system. The outlet of the sludge dryer is connected to the condensate tank via a first condensate pipe, and the outlet of the sludge dryer is connected to the flash evaporator via a first steam pipe. The outlet of the flash evaporator is connected to the amine process system via a second steam pipe, the desuperheating and pressure reducing device, and the boiling valve. The outlet of the amine process system is connected to a second condensate pipe. This utility model uses the waste steam from sludge drying for flash evaporation, replacing the steam used in the amine process system, and uses the hot water from flash evaporation to replace the steam used for ammonia stripping. This method minimizes the use of new steam, achieving cost savings, and also reduces water impact.

Description

Technical Field

[0001] This utility model relates to the field of steam heating technology, specifically to an energy-saving device for utilizing waste heat. Background Technology

[0002] Conventional steam heating technology utilizes high-grade heat energy to heat materials. To ensure operational stability and prevent water hammer, the steam generally requires a certain degree of superheat, resulting in very high operating costs. Therefore, it is necessary to provide an energy-saving device that reduces the use of new steam to achieve cost savings. Utility Model Content

[0003] The purpose of this invention is to provide an energy-saving device for waste heat utilization. By utilizing the waste steam from drying sludge, the use of new steam can be minimized, thereby achieving cost savings.

[0004] The technical solution of this utility model is as follows:

[0005] An energy-saving device for waste heat utilization includes a sludge dryer, a condensate tank, a flash tank, a desuperheating and pressure reducing device, a boiling valve, and an amine process system. The outlet of the sludge dryer is connected to the condensate tank via a first condensate pipe. The outlet of the sludge dryer is connected to the flash tank via a first steam pipe. The outlet of the flash tank is connected to the amine process system via a second steam pipe, a desuperheating and pressure reducing device, and a boiling valve. The outlet of the amine process system is connected to a second condensate pipe.

[0006] Furthermore, the sludge dryer is provided in two parts.

[0007] Furthermore, a third steam pipe is connected in parallel to the desuperheater and pressure reducer.

[0008] Furthermore, the energy-saving device for waste heat utilization also includes a steam regulating valve and an ammonia stripping tower. The outlet of the flash tank is connected to a condensate tank through a third condensate pipe. The outlet of the flash tank is connected to the ammonia stripping tower through a fourth condensate pipe and a steam regulating valve. The ammonia water inlet of the ammonia stripping tower is connected to an ammonia water pipe. The outlet of the ammonia stripping tower is connected to a sixth condensate pipe.

[0009] Furthermore, the energy-saving device for waste heat utilization also includes a first heat exchanger and a second heat exchanger. The first heat exchanger and the second heat exchanger are connected in parallel to the sixth condensate drain pipe. The ammonia water pipe is connected to the ammonia water inlet of the ammonia stripping tower via the second heat exchanger and the first heat exchanger. The outlet of the flash tank is connected to the first heat exchanger and the second heat exchanger via the fifth condensate drain pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses the waste steam after sludge drying for flash evaporation to replace the use of steam in the amine process system, and uses the hot water after flash evaporation to replace the use of steam for ammonia stripping. In this way, the use of new steam is reduced to the greatest extent, thereby achieving the purpose of saving costs, while also reducing water impact. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of an energy-saving device for waste heat utilization provided by this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0014] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0015] Example

[0016] Please see Figure 1This embodiment provides an energy-saving device for waste heat utilization, including two sludge dryers 1, a condensate tank 2, a flash tank 3, a desuperheating and pressure reducing device 4, a boiling valve regulating valve 5, an amine process system 6, a steam regulating valve 7, an ammonia stripping tower 8, a first heat exchanger 9, and a second heat exchanger 10. The outlets of the two sludge dryers 1 are respectively connected to the condensate tank 2 via a first condensate pipe 11. The outlets of the two sludge dryers 1 are respectively connected to the flash tank 3 via a first steam pipe 12. The outlet of the flash tank 3 is connected to the amine process system 6 via a second steam pipe 13, the desuperheating and pressure reducing device 4, and the boiling valve regulating valve 5. The outlet of the amine process system 6 is connected to a second condensate pipe 14. The temperature and pressure regulator 4 is also connected in parallel to a third steam pipe 15. The outlet of the flash tank 3 is connected to the condensate tank 2 through the third condensate pipe 16. The outlet of the flash tank 3 is connected to the ammonia stripping tower 8 through the fourth condensate pipe 17 and the steam regulating valve 7. The ammonia water inlet of the ammonia stripping tower 8 is connected to the ammonia water pipe 18. The outlet of the ammonia stripping tower 8 is connected to the sixth condensate pipe 19. The first heat exchanger 9 and the second heat exchanger 10 are connected in parallel to the sixth condensate pipe 19. The ammonia water pipe 18 is connected to the ammonia water inlet of the ammonia stripping tower 8 through the second heat exchanger 10 and the first heat exchanger 9. The outlet of the flash tank 3 is connected to the first heat exchanger 9 and the second heat exchanger 10 through the fifth condensate pipe 20.

[0017] Its working principle is as follows:

[0018] The waste steam from sludge drying, with a pressure of 0.6 MPa, a temperature of 145 degrees Celsius, and a flow rate of approximately 5 t / h, is delivered via the first steam pipe 12 to the flash tank 3. Steam with a pressure of 0.2 MPa, a temperature of 133 degrees Celsius, and a flow rate of approximately 1.5 t / h is then flashed. One path of this steam is supplied to the amine process system 6 via the desuperheater and pressure reducer 4, and the other path is supplied to the amine process system 6 via the boiling regulator valve 5. The condensate from the flashing process is supplied to the ammonia stripping tower 8 via the steam regulating valve 7, and the other path is used to heat ammonia water via the first heat exchanger 9 and the second heat exchanger 10. Any unused portion is discharged.

[0019] This waste heat utilization energy-saving device has the function of graded utilization of steam and hot water, which minimizes the use of new steam and achieves the purpose of saving costs. At the same time, it can reduce water impact.

[0020] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving device for waste heat utilization, characterized in that: The system includes a sludge dryer, a condensate tank, a flash tank, a desuperheater and pressure reducer, a boiling valve, and an amine process system. The outlet of the sludge dryer is connected to the condensate tank via a first condensate pipe. The outlet of the sludge dryer is connected to the flash tank via a first steam pipe. The outlet of the flash tank is connected to the amine process system via a second steam pipe, a desuperheater and pressure reducer, and a boiling valve. The outlet of the amine process system is connected to a second condensate pipe.

2. The energy saving device of claim 1, wherein: The sludge dryer is provided in two units.

3. The energy saving device of claim 1, wherein: A third steam pipe is also connected in parallel to the desuperheater and pressure reducer.

4. The energy saving device of claim 1, wherein: The energy-saving device for waste heat utilization also includes a steam regulating valve and an ammonia stripping tower. The outlet of the flash tank is connected to a condensate tank through a third condensate pipe. The outlet of the flash tank is connected to the ammonia stripping tower through a fourth condensate pipe and a steam regulating valve. The ammonia water inlet of the ammonia stripping tower is connected to an ammonia water pipe. The outlet of the ammonia stripping tower is connected to a sixth condensate pipe.

5. The energy saving device of claim 4, wherein: The energy-saving device for waste heat utilization also includes a first heat exchanger and a second heat exchanger. The first heat exchanger and the second heat exchanger are connected in parallel to the sixth condensate pipe. The ammonia water pipe is connected to the ammonia water inlet of the ammonia stripping tower via the second heat exchanger and the first heat exchanger. The outlet of the flash tank is connected to the first heat exchanger and the second heat exchanger via the fifth condensate pipe.

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