Grey water temperature raising system

Abstract

The utility model discloses a grey water temperature raising system which comprises a waste heat source, the output end of the waste heat source is connected with a heat exchanger through a waste heat pipeline, a pump outlet pipeline is connected to an inlet in the bottom of one side of the heat exchanger, and the other side of the pump outlet pipeline is connected with a grey water circulating pump. A regulating valve and a pump outlet hand valve are arranged on the pump outlet pipeline, heated grey water enters a grey water tank from a top outlet in the other side of the heat exchanger through a grey water return pipeline, a grey water return temperature measuring point is installed on the grey water return pipeline, the bottom of the grey water tank is connected to a grey water circulating pump through a pump inlet pipeline, and the grey water circulating pump is connected to the pump inlet pipeline. The heat exchanger is used for conveying heat exchange cold source grey water; compared with the prior art, the ash water temperature is increased, the steam adding amount of the conversion furnace of the rear system is effectively reduced, the operation cost is reduced, and the operation benefit of the device is improved; the emptying waste of the waste heat steam is avoided or eliminated, and the reasonable recycling of resources is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of gray water temperature control, in particular to a gray water temperature raising system. Background Art

[0002] According to the requirements of coal chemical industry and power generation process, the aerospace furnace device adopts the technical process of wet dust removal by dry feeding quenching process. Three-stage flash evaporation is used in black water treatment. The flash evaporation process recovers heat and concentrates black water at the same time. After the black water is precipitated in the sedimentation tank, the clarified gray water enters the gray water tank for recycling. In order to avoid or slow down the scaling phenomenon in the gray water circulation process, dispersant is added from the sedimentation tank to the overflow port of the gray water tank. The temperature of the gray water entering the gray water tank is determined by factors such as the circulation volume of the system water and the heat load of the device. Under normal circumstances, when the device load is constant and the system water circulation volume is constant, the gray water temperature is relatively stable. The temperature of the gray water system affects the temperature of the synthesis gas outlet. The temperature of the synthesis gas determines its ability to carry saturated steam under a certain pressure, which in turn affects the amount of steam added to the conversion furnace and is related to the steam consumption of the device. According to actual operating conditions, increasing the synthesis gas temperature can effectively reduce the amount of steam added to the conversion system, which is beneficial to the energy-saving and consumption-reducing operation of the device. However, in the prior art, the ash water temperature is relatively low, which affects the synthesis gas outlet temperature and further causes the problem of increased steam consumption in the conversion furnace. For this reason, the utility model proposes an ash water temperature raising system. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides an ash water temperature raising system to solve the problem that the ash water temperature is low, affecting the synthesis gas outlet temperature and thus causing an increase in the steam consumption of the conversion furnace.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gray water heating system, comprising a waste heat source, the output end of the waste heat source is connected to a heat exchanger through a waste heat pipeline, the bottom inlet of one side of the heat exchanger is connected to a pump outlet pipeline, and the other side of the pump outlet pipeline is connected to a gray water circulation pump, a regulating valve and a pump outlet manual valve are provided on the pump outlet pipeline, the heated gray water enters the gray water tank through the gray water return pipeline from the top outlet on the other side of the heat exchanger, and a gray water return temperature measuring point is installed on the gray water return pipeline, the bottom of the gray water tank is connected to the gray water circulation pump through the pump inlet pipeline for transporting the heat exchange cold source gray water.

[0005] As a preferred technical solution of the utility model, the lower end of the heat exchanger is connected to a condensate collection tank through a condensate pipeline.

[0006] As a preferred technical solution of the utility model, a condensate temperature measuring point is arranged on the condensate pipeline.

[0007] As a preferred technical solution of the utility model, a regulating valve secondary line connected in parallel with the regulating valve is also installed on the pump outlet pipeline, and a regulating valve secondary line manual valve is provided on the regulating valve secondary line.

[0008] As a preferred technical solution of the utility model, a grey water return valve is installed on the grey water return pipeline.

[0009] As a preferred technical solution of the utility model, a pump inlet valve is provided on the pump inlet pipeline.

[0010] As a preferred technical solution of the utility model, the heat exchanger adopts a vertical fixed tube sheet structure.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model discloses an ash water temperature raising system, which increases the ash water temperature, effectively reduces the amount of steam added to the rear system conversion furnace, reduces the operating cost, and improves the operating efficiency of the device; avoids or eliminates the waste of exhausting waste heat steam, and realizes the reasonable recycling of resources.

[0013] Other features and advantages of the present invention will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] In the figure: 1. waste heat source, 2. waste heat pipeline, 3. heat exchanger, 4. condensate pipeline, 5. condensate collection tank, 6. ash water tank, 8. pump inlet valve, 7. pump inlet pipeline, 9. ash water circulation pump, 10. pump outlet pipeline, 11. pump outlet manual valve, 12. manual valve before regulating valve, 13. regulating valve, 14. manual valve after regulating valve, 15. regulating valve auxiliary line, 16. manual valve of regulating valve auxiliary line, 17. ash water return pipeline, 18. ash water return valve, 19. condensate temperature measuring point, 20. ash water return temperature measuring point. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1 In this embodiment, a gray water temperature raising system is provided, including a waste heat source 1, the output end of the waste heat source 1 is connected to a heat exchanger 3 through a waste heat pipeline 2, a pump outlet pipeline 10 is connected to the bottom inlet of one side of the heat exchanger 3, and a gray water circulation pump 9 is connected to the other side of the pump outlet pipeline 10, and a regulating valve 13 and a pump outlet manual valve 11 are provided on the pump outlet pipeline 10, and a regulating valve is provided at the outlet of the gray water circulation pump to facilitate the regulation and control of the gray water circulation amount and control the appropriate condensate temperature. The heated gray water enters the gray water tank 6 from the top outlet of the other side of the heat exchanger 3 through the gray water return pipeline 17, and a gray water return temperature measuring point 20 is installed on the gray water return pipeline 17. The bottom of the tank 6 is connected to the gray water circulation pump 9 through the pump inlet pipeline 7 for conveying the gray water of the heat exchange cold source. The lower end of the heat exchanger 3 is connected to the condensate collection tank 5 through the condensate pipeline 4. The condensate pipeline 4 is provided with a condensate temperature measuring point 19. The pump outlet pipeline 10 is also provided with a regulating valve sub-line 15 connected in parallel with the regulating valve 13, and the regulating valve sub-line 15 is provided with a regulating valve sub-line manual valve 16. The gray water return pipeline 17 is provided with a gray water return valve 18. The pump inlet pipeline 7 is provided with a pump inlet valve 8. The heat exchanger 3 adopts a vertical fixed tube sheet structure to reduce the precipitation and scaling of the gray water. The gray water circulation pump, temperature measuring point and regulating valve are displayed on the DCS and can be remotely controlled.

[0020] After the waste heat source 1 passes through the heat exchanger 3, the temperature becomes the condensate temperature measuring point 19 of the condensate pipeline 4 and enters the condensate collection pool 5 for recycling, avoiding the waste of steam venting. At the same time, the ash water of the aerospace furnace device is heated, which is beneficial to the increase of the synthesis gas temperature, reducing the amount of steam added to the conversion furnace, and achieving the purpose of energy saving and consumption reduction. Avoiding the waste of steam venting, at the same time, the ash water of the aerospace furnace device is heated, which is beneficial to the increase of the synthesis gas temperature, reducing the amount of steam added to the conversion furnace, and achieving the purpose of energy saving and consumption reduction.

[0021] Furthermore, the regulating valve 13 and the gray water return temperature measuring point 20 form a control loop, and the control is implemented in the DCS operation screen. The temperature is set to 50°C for automatic control, wherein the gray water return temperature measuring point 20 and the condensate temperature measuring point 19 both use corrosion-resistant temperature sensors.

[0022] Furthermore, in order to prevent the gray water from being heated too high and causing vaporization or boiling, the gray water return temperature is required to be controlled to be greater than 95°C. The gray water return temperature and the regulating valve 13 form a control loop, and the temperature is set at 90°C for automatic control.

[0023] Furthermore, the condensate temperature and the heated ash water temperature act together on the regulating valve 13 in the DCS, and the temperature controller takes a larger value to output and control the regulating valve 13 .

[0024] Furthermore, the grey water return pipe 17 is inserted into the grey water tank 5 500 mm below the liquid level to avoid splashing.

[0025] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0026] When in use, fully open the grey water return valve 18, close the manual valve 16 of the regulating valve secondary line, fully open the manual valve 12 in front of the regulating valve, the manual valve 14 behind the regulating valve, fully open the grey water circulation pump inlet valve 8, slightly open the pump outlet manual valve 11, and the regulating valve 13 is in the closed state. Start the grey water circulation pump 9 according to the regulations, and after the pump runs stably, fully open the pump outlet manual valve 11. At this time, the temperature measurement of the grey water return water temperature measurement point 20 is fed back to the DCS, and the DCS controls the opening of the regulating valve 13 according to the temperature, thereby realizing the control of the grey water flow. After the ash water circulation pump 9 system runs stably, waste heat steam is gradually added. The outlet flow of the ash water circulation pump 9 is adjusted according to the changes in the condensate temperature and the ash water return temperature, and the amount of waste heat steam added is adjusted to finally reach a balance. After the system runs stably, the condensate outlet temperature is automatically added and the ash water return temperature is automatically added to control the regulating valve 13 together. The output is controlled in a large control mode to ensure that the temperature is within the index, thereby increasing the ash water temperature and reducing the steam consumption of the conversion furnace. At the same time, the waste heat is recovered, and the energy-saving and consumption-reducing operation of the device is achieved.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A grey water temperature raising system, characterized in that: The invention comprises a waste heat source (1), the output end of the waste heat source (1) is connected to a heat exchanger (3) through a waste heat pipeline (2), the bottom inlet of one side of the heat exchanger (3) is connected to a pump outlet pipeline (10), and the other side of the pump outlet pipeline (10) is connected to a grey water circulation pump (9), the pump outlet pipeline (10) is provided with a regulating valve (13) and a pump outlet manual valve (11), the heated grey water enters a grey water tank (6) from the top outlet of the other side of the heat exchanger (3) through a grey water return pipeline (17), and a grey water return temperature measuring point (20) is installed on the grey water return pipeline (17), the bottom of the grey water tank (6) is connected to the grey water circulation pump (9) through a pump inlet pipeline (7) for conveying the heat exchange cold source grey water.

2. A grey water temperature raising system according to claim 1, characterized in that: The lower end of the heat exchanger (3) is connected to a condensate collection tank (5) via a condensate pipeline (4).

3. A grey water temperature raising system according to claim 2, characterized in that: The condensate pipeline (4) is provided with a condensate temperature measuring point (19).

4. The grey water temperature raising system according to claim 1, characterized in that: A regulating valve front hand valve (12) and a regulating valve rear hand valve (14) are respectively provided on both sides of the regulating valve (13).

5. A grey water temperature raising system according to claim 4, characterized in that: The pump outlet pipeline (10) is also provided with a regulating valve secondary line (15) connected in parallel with the regulating valve (13), and a regulating valve secondary line manual valve (16) is provided on the regulating valve secondary line (15).

6. The grey water temperature raising system according to claim 1, characterized in that: A grey water return valve (18) is installed on the grey water return pipeline (17).

7. The grey water temperature raising system according to claim 1, characterized in that: The pump inlet pipeline (7) is provided with a pump inlet valve (8).

8. The grey water temperature raising system according to claim 1, characterized in that: The heat exchanger (3) adopts a vertical fixed tube sheet structure.

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