Low-grade waste heat recycling system for viscose fiber production

Abstract

The utility model discloses a low-grade waste heat recycling system for viscose fiber production. The low-grade waste heat recycling system comprises a heat exchanger I, an air conditioning chamber, a spraying pool and a spraying pipe, a heat release part of the heat exchanger I is connected with a low-grade heat source waste water pipe, a water inlet of a heat absorption part of the heat exchanger I is connected with a production water pool, a water outlet of the heat absorption part of the heat exchanger I is connected with an air conditioner room spraying pool, and the spraying pool and a spraying pipe are arranged in an air conditioner room. The air conditioning chamber is provided with a cold air inlet on one side of the spraying pipe; a heat release part of the heat exchanger II is connected with a steam pipeline, an inlet of a heat absorption part of the heat exchanger II is provided with a negative pressure fan, and an outlet of the heat absorption part of the heat exchanger II is connected with a viscose production workshop. By designing a low-grade waste heat utilization system, low-grade heat is fully recycled, steam consumption is reduced, and meanwhile the hidden danger that hot water damages strains in the environment-friendly treatment pond is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of viscose fiber production, in particular to a low-grade waste heat recovery and utilization system for viscose fiber production. Background Art

[0002] Based on the production policy of energy conservation and consumption reduction, we seek energy consumption reduction measures to reduce production costs. Through research, we found that in the field of viscose fiber production, on the one hand, there are currently about 600-800m 3 / h of low-grade (35-45℃) heat source (acidic) wastewater is directly discharged, causing this part of heat to be wasted and lost for no reason; at the same time, in order to reach the process temperature (27±1℃) in the winter, the spinning air-conditioning room of the filament production system needs to consume about 500 tons of steam per day for heating the air-conditioning room, which is a huge steam consumption.

[0003] Low-grade waste water is currently discharged directly into the Ministry of Environmental Protection's treatment pool. Due to the high temperature of low-grade waste water, there is a risk of damage to the bacteria in the treatment pool, increasing environmental pressure.

[0004] Currently, there are two main ways to heat air-conditioned rooms. The first is to first pass steam into the heat exchanger to transfer heat to the heat exchanger (the steam condenses into a pool), and then the cold air and the heat emitted from the heat exchanger undergo "air-to-air exchange". Since the heat exchange area is only the area of the heat exchanger plate, this method is limited and requires a large amount of steam heat to supplement it, which consumes a lot of energy. At the same time, the humidity in the air cannot be guaranteed.

[0005] The second method is to increase the humidity in the cold air by directly spraying steam from the steam pipe to contact the cold air, on the one hand to complete the temperature increase, on the other hand to increase the humidity in the cold air (because the steam is not saturated steam and still has a certain amount of water). 3 / h blower sends air into the spinning area. The air stays in the air-conditioned room for a short time, resulting in huge heat loss and poor heat exchange effect. Utility Model Content

[0006] The utility model aims to provide a low-grade waste heat recovery and utilization system for viscose fiber production. By designing the low-grade waste heat utilization system, low-grade heat can be fully recovered, thereby reducing the steam consumption for maintaining room temperature in the viscose fiber production workshop.

[0007] In order to achieve the above-mentioned purpose of the invention, the technical solution of the present utility model is as follows:

[0008] A low-grade waste heat recovery and utilization system for viscose fiber production includes a heat exchanger I, an air-conditioning room, a spray pool and a spray pipe; the heat release part of the heat exchanger I is connected to the low-grade heat source wastewater pipe, the heat absorption part of the heat exchanger I is connected to the production water pool at its water inlet, and the heat absorption part of the heat exchanger I is connected to the spray pool at its water outlet; the spray pool and the spray pipe are arranged in the air-conditioning room.

[0009] The spray pipe is arranged above the spray pool and connected to the spray pool through a pipe. The air-conditioning room is provided with a cold air inlet on one side of the spray pipe; a heat exchanger II is provided on one side of the spray pool, the heat release part of the heat exchanger II is connected to the steam pipe, the heat absorption part inlet of the heat exchanger II is provided with a negative pressure fan, and the heat absorption part outlet of the heat exchanger II is connected to the viscose fiber production workshop.

[0010] An overflow port is provided on the upper part of the spray pool, and the overflow port is connected to the production water pool.

[0011] Corner nozzles with a diameter of 1.5-2.5 mm are evenly distributed on the spray pipe; the spacing between the corner nozzles is 10-15 cm; this ensures that hot water can form mist when spraying, increases the contact area between air and hot water, and improves the heat exchange effect.

[0012] The edge of the spray pool is provided with a water baffle. After the spray pipe completes the hot water spraying, in order to ensure the recycling of the sprayed hot water, all the water after heat exchange is recovered into the spray pool and enters the system.

[0013] The water baffle is arranged between the spray pool and the heat exchanger II to prevent the water sprayed from the spray pipe from splashing onto the heat exchanger II, thereby reducing the heat exchange effect of the heat exchanger II using steam.

[0014] The outlet of the heat release part of the heat exchanger II is connected to the spray pool, and the steam condensed water generated by the heat exchanger II all enters the spray pool of the air-conditioning room to avoid heat waste.

[0015] The outlet of the heat absorbing part of the heat exchanger II is provided with a blower to send the heated air into the production workshop.

[0016] A centrifugal water pump is provided between the spray pool and the spray pipe, and a centrifugal water pump is provided between the heat exchanger I and the production water pool.

[0017] The water in the spray pool is pumped into the spray pipe by a centrifugal water pump, and the water in the production water pool is pumped into the spray pool through the heat exchanger I. The excess water in the spray pool flows back to the production water pool through the overflow port, realizing the water circulation of the system.

[0018] Beneficial effects of the utility model:

[0019] 1. In this utility model, by designing a low-grade waste heat utilization system, low-grade heat is fully recovered, steam consumption is reduced, and the temperature of low-grade heat source wastewater is lowered through waste heat recovery, preventing hot water from being directly discharged into the environmental protection treatment pool and causing damage to high-temperature-sensitive bacteria in the environmental protection pool.

[0020] 2. In the present utility model, in the low-grade waste heat recovery and utilization system, a spray pool and a spray pipe are set in the air-conditioning room. Cold air enters the air-conditioning room from the cold air inlet and passes through the spray pipe for liquid-gas heat exchange, thereby expanding the heat exchange area and improving heat utilization efficiency.

[0021] 3. The utility model solves the problem of huge waste of steam when steam is directly sprayed into the air for heating, thereby reducing carbon emissions.

[0022] 4. This utility model realizes the recycling of heat from the low-grade heat source wastewater in the park, and solves the impact of excessively high wastewater temperature on the destruction of bacteria in the entire sewage pool.

[0023] 5. In the present invention, the use of hot water spraying and cold air heat exchange can not only increase the air temperature, but also increase the humidity, further reducing steam consumption, eliminating the need to use steam for spray humidification, and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a low-grade waste heat recovery and utilization system for viscose fiber production according to the present utility model.

[0025] Among them, 1. Heat exchanger I; 2. Air-conditioning room; 3. Spray pool; 4. Spray pipe; 5. Heat exchanger II; 6. Corner nozzle; 7. Water baffle; 8. Centrifugal water pump; 9. Production water pool. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the embodiments, but the embodiments of the present invention are not limited thereto.

[0027] Example 1

[0028] This embodiment provides a Figure 1The low-grade waste heat recovery and utilization system for viscose fiber production shown in the figure includes a heat exchanger I1, an air-conditioning room 2, a spray pool 3 and a spray pipe 4; the heat release part of the heat exchanger I1 is connected to the low-grade heat source wastewater pipe, the water inlet of the heat absorption part of the heat exchanger I1 is connected to the production water pool 9, and the water outlet of the heat absorption part of the heat exchanger I1 is connected to the spray pool 3. The spray pool 3 and the spray pipe 4 are arranged in the air-conditioning room 2, the spray pipe 4 is arranged above the spray pool 3 and is connected to the spray pool 3 through a pipe, and the air-conditioning room 2 is provided with a cold air inlet on one side of the spray pipe 4; a heat exchanger II5 is provided on one side of the spray pool 3, the heat release part of the heat exchanger II5 is connected to the steam pipe, the heat absorption part inlet of the heat exchanger II5 is provided with a negative pressure fan, and the heat absorption part outlet of the heat exchanger II5 is connected to the viscose fiber production workshop.

[0029] In this embodiment, the heat exchanger I1 is a plate heat exchanger. The heat release portion of the heat exchanger I1 is connected to the low-grade heat source wastewater pipe, and the outlet of the heat absorption portion is connected to the spray pool 3. The low-grade heat source wastewater in the heat exchanger I1 is heat-exchanged with the production water in the production water pool 9. After the heat exchange is completed, the temperature of the low-grade heat source wastewater is reduced and discharged into the environmental protection treatment pool. The production water in the production water pool 9 is heated and then sent to the spray pool 3.

[0030] Heat exchanger Ⅱ5 adopts a steam heat exchanger. The heat release part of heat exchanger Ⅱ5 is connected to the steam pipe. The inlet of the heat absorption part of heat exchanger Ⅱ5 is provided with a negative pressure fan. The outlet of the heat absorption part of heat exchanger Ⅱ5 is connected to the viscose fiber production workshop. The air heated by the spray pool in heat exchanger Ⅱ exchanges heat with steam. The air is heated by steam and then discharged into the workshop to increase the temperature of the workshop.

[0031] In this embodiment, the low-grade waste heat recovery and utilization for viscose fiber production is achieved through the following steps:

[0032] 1) First, the low-grade heat source wastewater (temperature 35-45°C) is transported to the heat exchanger I1 for heat exchange with the produced water in the production water pool 9. After the heat exchange, the produced water temperature can be increased to 27-32°C;

[0033] 2) The heated production water enters the spray pool 3 through the pipeline and is then transported to the spray pipe 4 for hot water spraying. During the spraying process, the cold air and hot water fully contact and exchange heat. After the heat exchange, the temperature of the produced water is reduced by 8-10°C, and the cold air is heated;

[0034] 3) The hot air after heat exchange is sent into heat exchanger II5 through the negative pressure exhaust of the blower of heat exchanger II5 to exchange heat with steam, and the air temperature is heated to the process range (27-30℃). Finally, it is sent to the spinning area to adjust the temperature and humidity.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is that, in this embodiment, an overflow port is provided on the top of the spray pool 3, and the overflow port is connected to the production water pool 9. The rest of the structure is the same as that of embodiment 1.

[0037] In this embodiment, excess water in the spray pool 3 flows back to the production water pool 9 through the overflow port, thereby realizing the circulation of system water.

[0038] Example 3

[0039] Compared with Example 1, the present embodiment differs in that, in the present embodiment, a plurality of spray pipes 4 are provided, and a plurality of corner nozzles 6 with a diameter of 1.5-2.5 mm are evenly distributed on each spray pipe 4; the spacing between the corner nozzles is 10-15 cm; the rest of the structure is the same as that of Example 1.

[0040] In this embodiment, in order to ensure the spraying effect, on the one hand, multiple groups of spray pipes 4 are distributed above the water pool during air conditioning, and on the other hand, corner nozzles 6 with a diameter of 1.5-2.5 mm are evenly distributed on the spray pipes 4. The spacing between each nozzle is about 10-15 cm designed according to the water pressure to ensure that the hot water can form a mist when spraying, increase the contact area between the air and the hot water, and improve the heat exchange effect.

[0041] Example 4

[0042] Compared with Example 1, the present embodiment differs in that, in the present embodiment, a water retaining plate 7 is provided at the edge of the spray pool 3 , and the water retaining plate 7 is provided between the spray pool 3 and the heat exchanger II 5 ; the rest of the structure is the same as that of Example 1.

[0043] In this embodiment, after the spray pipe 4 completes the hot water spraying, in order to ensure the recycling of the hot water, all the water after heat exchange is recovered to the spray pool 3 and enters the system; at the same time, the water sprayed from the spray pipe 4 is prevented from splashing into the heat exchanger II 5, thereby reducing the heat exchange effect of the heat exchanger II 5 using steam.

[0044] Example 5

[0045] The difference between this embodiment and embodiment 1 is that, in this embodiment, the outlet of the heat release part of the heat exchanger II 5 is connected to the spray pool 3; the rest of the structure is the same as that of embodiment 1.

[0046] In this embodiment, all the steam condensed water generated by the heat exchanger II 5 enters the spray pool 3 in the air-conditioning room 2 to avoid heat waste.

[0047] Example 6

[0048] The difference between this embodiment and embodiment 1 is that, in this embodiment, a blower is provided at the outlet of the heat absorption part of the heat exchanger II 5 ; the rest of the structure is the same as that of embodiment 1.

[0049] In this embodiment, a blower is provided to send the heated air into the production workshop, thereby increasing the air supply efficiency.

[0050] Example 7

[0051] The difference between this embodiment and embodiment 2 is that, in this embodiment, a centrifugal water pump 8 is provided between the spray pool 3 and the spray pipe 4, and a centrifugal water pump 8 is provided between the heat exchanger I1 and the production water pool 9; the remaining structures are the same as those in embodiment 1.

[0052] In this embodiment, the water in the spray pool 3 is pumped into the spray pipe 4 by the centrifugal water pump 8, and the water in the production water pool 9 is pumped into the spray pool 3 through the heat exchanger I1. The excess water in the spray pool 3 flows back to the production water pool 9 through the overflow port, realizing the water circulation of the system.

[0053] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A low-grade waste heat recovery system for viscose fiber production, characterized by: The invention comprises a heat exchanger I (1), an air conditioning room (2), a spray pool (3) and a spray pipe (4); the heat release part of the heat exchanger I (1) is connected to a low-grade heat source wastewater pipe, the water inlet of the heat absorption part of the heat exchanger I (1) is connected to a production water pool (9), the water outlet of the heat absorption part of the heat exchanger I (1) is connected to the spray pool (3), the spray pool (3) and the spray pipe (4) are arranged in the air conditioning room (2), the spray pipe (4) is arranged above the spray pool (3) and is connected to the spray pool (3) through a pipe, and the air conditioning room (2) is provided with a cold air inlet on one side of the spray pipe (4); a heat exchanger II (5) is provided on one side of the spray pool (3), the heat release part of the heat exchanger II (5) is connected to a steam pipe, the heat absorption part inlet of the heat exchanger II (5) is provided with a negative pressure fan, and the heat absorption part outlet of the heat exchanger II (5) is connected to a viscose fiber production workshop.

2. The low-grade waste heat recovery and utilization system according to claim 1, characterized in that: An overflow port is provided on the upper portion of the spray pool (3), and the overflow port is connected to the production water pool (9).

3. The low-grade waste heat recovery and utilization system according to claim 1, characterized in that: One or more corner nozzles (6) with a diameter of 1.5-2.5 mm are evenly distributed on the spray pipe (4).

4. The low-grade waste heat recovery and utilization system according to claim 1, characterized in that: A water retaining plate (7) is provided at the edge of the spray pool (3).

5. The low-grade waste heat recovery and utilization system according to claim 4, characterized in that: A water baffle (7) is provided between the spray pool (3) and the heat exchanger II (5).

6. The low-grade waste heat recovery and utilization system according to claim 1, characterized in that: The outlet of the heat absorbing part of the heat exchanger II (5) is provided with a blower.

7. The low-grade waste heat recovery and utilization system according to claim 1, characterized in that: A centrifugal water pump (8) is provided between the spray pool (3) and the spray pipe (4), and a centrifugal water pump (8) is provided between the heat exchanger I (1) and the production water pool (9).

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