Drying system waste heat recycling system in indigo blue production
By designing a waste heat recovery and utilization system for the drying system, the problem of direct emission of high-temperature waste gas in indigo production was solved, achieving efficient recovery and utilization of waste heat and reducing energy consumption and environmental pollution.
Patent Information
- Application Number
- CN202520478980.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-18
AI Technical Summary
In the process of indigo production, the direct emission of high-temperature waste gas leads to energy waste and environmental pollution, and traditional processes fail to effectively utilize waste heat resources.
Design a waste heat recovery and utilization system for a drying system, including a drum dryer, a heat exchanger, a heat pump system and a central water tank. The system recovers heat from high-temperature waste gas through heat exchange and refrigerant circulation, and uses the heat to heat the air in winter and preheat it in summer.
It achieves efficient recovery and utilization of waste heat, reduces energy consumption and greenhouse gas emissions, lowers environmental pollution, and optimizes production costs.
Smart Images
Figure CN223856099U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the waste heat recycling technical field, and specifically points to a kind of drying system waste heat recycling system in indigo production. BACKGROUND
[0002] As an important natural dye, indigo is widely used in many fields. With the growing demand for indigo in the market, its production scale continues to expand. In the production process of indigo, the drum dryer is the key link for drying the potassium sodium salt mother liquor. This process produces a large amount of high-temperature waste gas. In the traditional process, these high-temperature waste gas is usually directly discharged into the atmosphere, not only causing a huge waste of energy, but also increasing the production cost of enterprises. At the same time, the heat pollution brought by waste gas emission has an adverse effect on the surrounding environment. SUMMARY
[0003] The utility model aims to provide a kind of drying system waste heat recycling system in indigo production, which can recycle the high-temperature waste gas generated in the drying process and reduce environmental pollution.
[0004] To achieve the above purpose, the drying system waste heat recycling system in indigo production of the utility model, including drum dryer, first heat exchanger, second heat exchanger, central pool, heat pump system, the drum dryer includes drum, heat carrier introduction pipeline, high-temperature potassium sodium salt mother liquor output channel, exhaust gas discharge pipeline, discharge device pipeline, wherein the heat carrier introduction pipeline, feeding device pipeline are located at the left side of drum dryer respectively, exhaust gas discharge pipeline, discharge device pipeline are respectively arranged at the right side of drum dryer;Drum inside is equipped with heating device;Second heat exchanger includes two output pipelines, one of which is connected with high-temperature potassium sodium salt mother liquor output channel, and the other output pipeline is connected with the outside through exhaust fan;Exhaust gas discharge pipeline is connected with first heat exchanger, and first heat exchanger includes waste water discharge pipeline and high-temperature cooling water output pipeline;High-temperature cooling water output pipeline is connected with central pool through pump, central pool includes low-temperature cooling water output pipeline and high-temperature cooling water discharge pipeline, low-temperature cooling water output pipeline, high-temperature cooling water discharge pipeline is connected with heat pump system, and low-temperature cooling water output pipeline is connected with first heat exchanger.
[0005] As a further scheme of the present application: the heat pump system comprises an evaporator, the evaporator comprises two output pipelines, the first output pipeline is connected with the central pool, the second output pipeline is connected with the compressor, the output pipeline of the compressor is divided into two parallel pipelines, one pipeline is connected with the gas-liquid condenser through a valve I, the other pipeline is connected with the gas-gas condenser through a valve III, the gas-liquid condenser comprises two output pipelines, one output pipeline is connected with the expansion valve through a valve II, the other output pipeline is a high-temperature return water output pipeline, and the gas-gas condenser comprises two output pipelines, one output pipeline is connected with the expansion valve through a valve IV, the other output pipeline is connected with the high-temperature air input pipeline through a fan, and the evaporator is connected with the expansion valve output pipeline.
[0006] As a further scheme of the present application: the second heat exchanger further comprises two input pipelines, one of which is a potassium sodium salt mother liquor input pipeline, and the other is a high-temperature air input pipeline.
[0007] As a further scheme of the present application: the expansion valve output pipeline transports low-temperature and low-pressure liquid refrigerant, the expansion valve input pipeline transports liquid refrigerant, and the second output pipeline transports low-temperature and low-pressure gaseous refrigerant; the compressor output pipeline transports high-temperature and high-pressure gaseous refrigerant.
[0008] Compared with the prior art, the present application has the following advantages: the potassium sodium salt mother liquor enters the drum dryer for material drying, the generated waste gas enters the first heat exchanger for heat exchange with cooling water, the high-temperature cooling water after heat exchange enters the evaporator to heat the liquid refrigerant, the low-temperature and low-pressure liquid refrigerant passes through the evaporator and the compressor in sequence to become high-temperature and high-pressure gaseous refrigerant; in winter, the high-temperature and high-pressure gaseous refrigerant exchanges heat with return water in the condenser to generate high-temperature water entering the heating system; in summer, the high-temperature and high-pressure gaseous refrigerant exchanges heat with low-temperature air in the condenser to generate high-temperature air preheating entering the drum dryer; the high-temperature and high-pressure gaseous refrigerant after cooling becomes low-temperature and low-pressure liquid refrigerant entering the evaporator through the expansion valve to complete a cycle process. The present application can recycle waste heat of the potassium sodium salt mother liquor drying system in the indigo production process, reduce energy consumption, reduce greenhouse gas emissions due to energy production and use, and reduce environmental pollution. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 Yes, it is a structural schematic view.
[0010] In the figure: 1, drum dryer; 101, high-temperature potassium sodium salt mother liquor output channel; 102, heat carrier introduction pipeline; 103, discharge device pipeline; 2, first heat exchanger; 201, exhaust gas discharge pipeline; 202, high-temperature cooling water output pipeline; 203, waste water output pipeline; 204, low-temperature cooling water output pipeline; 3, central water tank; 301, high-temperature cooling water discharge pipeline; 302, first output pipeline; 4, evaporator; 401, expansion valve output pipeline; 402, second output pipeline; 5, compressor; 6, gas-liquid condenser; 601, compressor output pipeline; 602, expansion valve input pipeline; 603, low-temperature return water input pipeline; 604, high-temperature return water output pipeline; 7, expansion valve; 8, gas-gas condenser; 801, low-temperature air input pipeline; 802, high-temperature air input pipeline; 9, heat pump system; 10, valve I; 11, valve II; 12, valve III; 13, valve IV; 14, second heat exchanger; 141, potassium sodium salt mother liquor input pipeline. DETAILED DESCRIPTION
[0011] The utility model will be further described below in combination with the drawings.
[0012] As Figure 1 shown, the dry system waste heat recycling system in indigo production, including drum dryer 1, first heat exchanger 2, second heat exchanger 14, central water tank 3, heat pump system 9, drum dryer 1 includes drum, heat carrier introduction pipeline 102, high-temperature potassium sodium salt mother liquor output channel 101, exhaust gas discharge pipeline 201, discharge device pipeline 103, heat carrier introduction pipeline 102, feed device pipeline 101 are located respectively at the left side of drum dryer 1, exhaust gas discharge pipeline 201, discharge device pipeline 103 are arranged at the right side of drum dryer 1;Drum inside is equipped with heating device;Second heat exchanger 14 includes two output pipelines, wherein one output pipeline is connected with high-temperature potassium sodium salt mother liquor output channel 101, and another output pipeline is connected with outside through exhaust fan;Exhaust gas discharge pipeline 201 is connected with first heat exchanger 2, and first heat exchanger 2 includes waste water discharge pipeline 203 and high-temperature cooling water output pipeline 202, and high-temperature cooling water output pipeline 202 is connected with central water tank 3 through a pump, and central water tank 3 includes low-temperature cooling water output pipeline 204 and high-temperature cooling water discharge pipeline 301, and low-temperature cooling water output pipeline 204 and high-temperature cooling water discharge pipeline 301 are connected with heat pump system 9, and low-temperature cooling water output pipeline 204 is connected with first heat exchanger 2.
[0013] The heat pump system 9 comprises an evaporator 4, the evaporator 4 comprises two output pipes, a first output pipe 302 is connected with the central water pool 3, a second output pipe 402 is connected with the compressor 5, the output pipe of the compressor 5 is divided into two parallel pipes, one pipe is connected with the gas-liquid condenser 6 through the valve I 10, the other pipe is connected with the gas-gas condenser 8 through the valve III 12, the gas-liquid condenser 6 comprises two output pipes, one output pipe is connected with the expansion valve 7 through the valve II 11, the other output pipe is a high-temperature return water output pipe 604, and the gas-liquid condenser 6 further comprises a low-temperature return water input pipe 603; the gas-gas condenser 8 comprises two output pipes, one output pipe is connected with the expansion valve 7 through the valve IV 13, the other output pipe is connected with the high-temperature air input pipe 802 through the fan, and the gas-gas condenser 8 further comprises a low-temperature air input pipe 801; the expansion valve 7 comprises an expansion valve input pipe 602 and an expansion valve output pipe 401, and the expansion valve output pipe 401 is connected with the evaporator 4.
[0014] The high-temperature cooling water discharge pipe 301 is connected with the evaporator 4.
[0015] The second heat exchanger 14 further comprises two input pipes, one of which is a potassium sodium salt mother liquor input pipe 141, and the other is a high-temperature air input pipe 802.
[0016] The evaporator 4 comprises low-temperature and low-pressure liquid refrigerant; the expansion valve output pipe 401 transports low-temperature and low-pressure liquid refrigerant, the expansion valve input pipe 602 transports liquid refrigerant, and the second output pipe 402 transports low-temperature and low-pressure gaseous refrigerant; the compressor output pipe 601 transports high-temperature and high-pressure gaseous refrigerant.
[0017] The working process of the utility model: the potassium sodium salt mother liquor enters the second heat exchanger 14 through the potassium sodium salt mother liquor input pipeline 141 and is preheated, becomes high-temperature potassium sodium salt mother liquor and enters the drum dryer 1 through the high-temperature potassium sodium salt mother liquor output pipeline 101, the steam enters the drum dryer 1 through the heat carrier introduction pipeline 102, the steam as heat source conducts heat to the material through the drum wall; the dry material enters the next process through the discharge device pipeline 103, the steam moisture vaporization forms waste gas which enters the first heat exchanger 2 through the waste gas exhaust pipeline 201; the waste gas and the low-temperature cooling water output pipeline 204 discharged low-temperature cooling water carry out heat exchange in the first heat exchanger 2, the waste gas releases heat and forms waste water which is discharged through the waste water output pipeline 203 of the first heat exchanger 2, the low-temperature cooling water absorbs heat and becomes high-temperature cooling water, the high-temperature cooling water is input into the high-temperature cooling water output pipeline 202 and enters the central water pool 3 through the pump; the cooling water in the central water pool 3 is continuously heated, the first heat exchanger 2 and the central water pool 3 form circulation; the central water pool 3 and the evaporator 4 carry out heat exchange, the high-temperature cooling water enters the evaporator 4 through the high-temperature cooling water exhaust pipeline 301 and releases heat, forms low-temperature cooling water, the low-temperature cooling water enters the central water pool 3 through the first output pipeline 302 and circulates and heats; the low-temperature low-pressure liquid refrigerant in the evaporator 4 absorbs heat and becomes low-temperature low-pressure gaseous refrigerant, the low-temperature low-pressure gaseous refrigerant enters the compressor 5 through the second output pipeline 402, the pressure and temperature are increased in the compressor 5 and become high-temperature high-pressure gaseous refrigerant; the high-temperature high-pressure gaseous refrigerant is transported to the gas-liquid condenser 6 or the gas-gas condenser 8 through the compressor output pipeline 601 and carries out heat exchange.
[0018] Take winter and summer as examples to introduce how the gas-liquid condenser 6 and the gas-gas condenser 8 work. In winter, open the valve I 10 and the valve II 11, close the valve III 12 and the valve IV 13, the high-temperature and high-pressure gaseous refrigerant enters the gas-liquid condenser 6 to exchange heat with the low-temperature return water, the low-temperature return water is input through the low-temperature return water input pipeline 603, the high-temperature and high-pressure gaseous refrigerant releases heat to condense into liquid refrigerant, the released heat is used to heat the low-temperature return water, the heated low-temperature return water becomes high-temperature return water, the high-temperature return water is output through the high-temperature return water output pipeline 604 and enters the heating system; in summer, open the valve III 12 and the valve IV 13, close the valve I 10 and the valve II 11, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the air input through the low-temperature air input pipeline 801 in the gas-gas condenser 8, the high-temperature and high-pressure gaseous refrigerant releases heat to condense into liquid refrigerant, enters the expansion valve 7 through the valve IV 13, the released heat is used to heat the air, the heated air becomes high-temperature air, the high-temperature air enters the heat exchanger 14 through the fan high-temperature air input pipeline 802. The high-temperature air preheats the potassium sodium salt mother liquor in the heat exchanger 14, the high-temperature air releases heat to become low-temperature air, the low-temperature air enters the atmosphere through the output pipeline with the fan, the preheated high-temperature potassium sodium salt mother liquor enters the drum dryer 1 through the potassium sodium salt mother liquor output pipeline 101 to be dried.
Claims
1. A system for recovering and utilizing waste heat from a drying system in indigo production, comprising a roller dryer (1), characterized in that, The first heat exchanger (2), the second heat exchanger (14), the central water tank (3), the heat pump system (9), the roller dryer (1) comprises a roller, a heat carrier introduction pipeline (102), a high-temperature potassium-sodium salt mother liquor output channel (101), a waste gas discharge pipeline (201), and a discharge device pipeline (103), wherein the heat carrier introduction pipeline (102) and the high-temperature potassium-sodium salt mother liquor output channel (101) are respectively located on the left side of the roller dryer (1), and the waste gas discharge pipeline (201) and the discharge device pipeline (103) are respectively arranged on the right side of the roller dryer (1); the roller is internally provided with a heating device; the second heat exchanger (14) comprises two output pipelines, one of which is connected with the high-temperature potassium-sodium salt mother liquor output channel (101), and the other is connected with the outside through an exhaust fan; the waste gas discharge pipeline (201) is connected with the first heat exchanger (2), the first heat exchanger (2) comprises a waste water discharge pipeline (203) and a high-temperature cooling water output pipeline (202), the high-temperature cooling water output pipeline (202) is connected with the central water tank (3) through a pump, the central water tank (3) comprises a low-temperature cooling water output pipeline (204) and a high-temperature cooling water discharge pipeline (301), the low-temperature cooling water output pipeline (204) and the high-temperature cooling water discharge pipeline (301) are connected with the heat pump system (9), and the low-temperature cooling water output pipeline (204) is connected with the first heat exchanger (2).
2. The system according to claim 1, wherein The heat pump system (9) comprises an evaporator (4), the evaporator (4) comprises two output pipelines, a first output pipeline (302) is connected with the central water tank (3), and a second output pipeline (402) is connected with a compressor (5); the output pipeline of the compressor (5) is divided into two parallel paths, one path is connected with a gas-liquid condenser (6) through a valve I (10), and the other path is connected with a gas-gas condenser (8) through a valve III (12); the gas-liquid condenser (6) comprises two output pipelines, one output pipeline is connected with an expansion valve (7) through a valve II (11), and the other output pipeline is a high-temperature return water output pipeline (604) and further comprises a low-temperature return water input pipeline (603); the gas-gas condenser (8) comprises two output pipelines, one output pipeline is connected with the expansion valve (7) through a valve IV (13), and the other output pipeline is connected with a high-temperature air input pipeline (802) through a fan and further comprises a low-temperature air input pipeline (801); the expansion valve (7) comprises an expansion valve input pipeline (602) and an expansion valve output pipeline (401), and the expansion valve output pipeline (401) is connected with the evaporator (4).
3. The system according to claim 2, wherein The high-temperature cooling water discharge pipeline (301) is connected with the evaporator (4).
4. The system according to claim 1, wherein The second heat exchanger (14) further comprises two input pipelines, one of which is a potassium-sodium salt mother liquor input pipeline (141), and the other is a high-temperature air input pipeline (802).
5. The system according to claim 2, wherein The low-temperature and low-pressure liquid refrigerant is transported in the expansion valve output pipeline (401), the liquid refrigerant is transported in the expansion valve input pipeline (602), and the low-temperature and low-pressure gaseous refrigerant is transported in the second output pipeline (402); and the high-temperature and high-pressure gaseous refrigerant is transported in the compressor output pipeline (601).