Pickling unit capable of efficiently utilizing steam condensate water

Abstract

The utility model is suitable for the technical field of pickling equipment, and provides a pickling unit capable of efficiently utilizing steam condensate water. Comprising a plurality of graphite heat exchangers, a steam condensate collecting pipe and a rinsing tank heating tank, condensate outlets are formed in the bottoms of the graphite heat exchangers, the condensate outlets are communicated with the steam condensate collecting pipe through first branch pipes, and the steam condensate collecting pipe inputs condensate into the rinsing tank heating tank through second branch pipes. The steam condensate water waste heat recovery device can effectively utilize and recover steam condensate water waste heat, reduces energy consumption of a pickling unit, achieves energy conservation and emission reduction, reduces waste of water resources, further reduces pickling production cost on the premise of guaranteeing normal production process and quality of the unit, and improves economic benefits of enterprises.

Description

TECHNICAL FIELD

[0001] The utility model relates to pickling equipment technical field, specifically a kind of pickling unit of efficient utilization of steam condensate. BACKGROUND

[0002] Pickling is through acid liquid to wash off the hot-rolled strip surface oxide scale, meet the production process of cold rolling mill rolling needs, such as common hot-rolled strip continuous hydrochloric acid pickling, hot-rolled stainless steel strip continuous mixed acid pickling, hot-rolled steel plate immersion pickling etc.

[0003] Because the steam condensate of heat exchange is complete still has about 90-100 ℃ temperature, directly external heat loss is larger, not in line with the needs of energy saving and emission reduction, leading to energy waste, in order to solve the technical problem, present a kind of pickling unit of efficient utilization of steam condensate. SUMMARY

[0004] The utility model discloses a kind of pickling unit of efficient utilization of steam condensate, to solve the steam condensate of heat exchange in prior art is complete still has about 90-100 ℃ temperature, directly external heat loss is larger, not in line with the needs of energy saving and emission reduction, leading to energy waste problem.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of pickling unit of efficient utilization of steam condensate, comprising: several graphite heat exchangers, steam condensate collection pipe and rinsing tank heating tank, the graphite heat exchanger bottom is provided with condensate outlet, the condensate outlet is communicated with steam condensate collection pipe by first branch pipe, the steam condensate collection pipe is input condensate to rinsing tank heating tank by second branch pipe.

[0007] This scheme can effectively utilize steam condensate waste heat and recovery, reduce the energy consumption of pickling unit, realize energy saving and emission reduction, and reduce the waste of water resources, further reduce pickling production cost under the premise of guaranteeing unit normal production process and quality, improve the economic benefit of enterprise.

[0008] As a further scheme of the utility model: first valve is provided on the first branch pipe.

[0009] As a further scheme of the utility model: second valve is provided on the second branch pipe.

[0010] As a further scheme of the present utility model: the third branch pipe is further communicated with a third valve.

[0011] As a further scheme of the present utility model: the third valve is arranged on the third branch pipe.

[0012] As a further scheme of the present utility model: the first valve, the second valve and the third valve are ball valves or gate valves.

[0013] As a further scheme of the present utility model: the steam condensate water collecting pipe, the first branch pipe, the second branch pipe and the third branch pipe are all made of stainless steel.

[0014] As a further scheme of the present utility model: the first valve, the second valve and the third valve are all made of stainless steel.

[0015] As a further scheme of the present utility model: the graphite heat exchanger is provided with two, and the two graphite heat exchangers are respectively communicated with the steam condensate water collecting pipe through a first branch pipe.

[0016] As a further scheme of the present utility model: a steam input interface is arranged at the top of the graphite heat exchanger, and the steam input interface is used for inputting steam into the graphite heat exchanger.

[0017] Compared with the prior art, the present utility model has the beneficial effects that: the steam condensate water waste heat can be effectively utilized and recovered, the energy consumption of the pickling unit is reduced, energy saving and emission reduction are realized, the waste of water resources is reduced, the pickling production cost is reduced under the premise of ensuring normal production process and quality of the unit, and the economic benefit of the enterprise is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the pickling unit for efficiently utilizing steam condensate water.

[0019] In the drawing: 1-graphite heat exchanger, 2-steam condensate water collecting pipe, 3-rinse tank heating tank, 11-steam input interface, 12-condensate water output port, 13-first valve, 21-second valve, 22-third valve. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present utility model.

[0021] As shown in the drawings:Figure 1 The schematic diagram of a pickling unit that efficiently utilizes steam condensate is shown in the embodiment of this utility model. Existing pickling units for hot-rolled metal strips use steam or other heating media to heat the acid solution to the process temperature via a graphite heat exchanger or other methods before pumping it into the acid tank for pickling the hot-rolled metal strip. The used acid solution flows back to the acid tank for reheating and is then circulated back to the acid tank. During the heat exchange process, the condensate formed by the steam is directly discharged. Because the steam condensate still has a temperature of approximately 90-100°C after heat exchange, direct discharge results in significant heat loss, which does not meet the requirements of energy conservation and emission reduction, leading to energy waste. To solve this technical problem, a pickling unit that efficiently utilizes steam condensate is proposed. This unit effectively utilizes and recovers the waste heat from the steam condensate, reducing the energy consumption of the pickling unit, achieving energy conservation and emission reduction, and reducing water waste. Furthermore, while ensuring normal production processes and quality, it reduces pickling production costs and improves the economic benefits for enterprises.

[0022] Example 1

[0023] Please see Figure 1 The present invention provides a structural diagram of a pickling unit that efficiently utilizes steam condensate, according to Embodiment 1. The pickling unit includes: several graphite heat exchangers 1, a steam condensate collection pipe 2, and a rinsing tank heating tank 3. The bottom of each graphite heat exchanger 1 is provided with a condensate outlet 12, which is connected to the steam condensate collection pipe 2 through a first branch pipe. The steam condensate collection pipe 2 inputs condensate into the rinsing tank heating tank 3 through a second branch pipe, so as to reuse the heat energy of the condensate.

[0024] This invention can effectively utilize and recover the waste heat of steam condensate, reduce the energy consumption of pickling units, achieve energy conservation and emission reduction, and reduce water waste. In turn, it can reduce pickling production costs and improve the economic benefits of enterprises while ensuring the normal production process and quality of the units.

[0025] like Figure 1 As shown, in some embodiments, a first valve 13 is provided on the first branch pipe, and the first valve 13 is used to control the opening and closing of the first branch pipe.

[0026] In some embodiments, a second valve 21 is provided on the second branch pipe, and the second valve 21 is used to control the opening and closing of the second branch pipe.

[0027] In some embodiments, a third branch pipe is also connected to the steam condensate collection pipe 2, and a third valve 22 is provided on the third branch pipe to facilitate the control of the opening and closing of the third branch pipe. The steam condensate collection pipe 2 facilitates the drainage of excess condensate from it.

[0028] In some embodiments, the first valve 13, the second valve 21 and the third valve 22 can be ball valves or gate valves, etc., which are specifically set according to needs.

[0029] In some embodiments, since there is acid in the graphite heat exchanger 1, the steam condensate collecting pipe 2, the first branch pipe, the second branch pipe and the third branch pipe can be made of stainless steel.

[0030] In some embodiments, the first valve 13, the second valve 21 and the third valve 22 are also made of stainless steel.

[0031] In some embodiments, the graphite heat exchanger 1 can be provided in two, and the two graphite heat exchangers 1 are respectively communicated with the steam condensate collecting pipe 2 through a first branch pipe, so as to collect and input the condensate into the steam condensate collecting pipe 2.

[0032] In some embodiments, a steam input interface 11 is arranged at the top of the graphite heat exchanger 1, which is used for inputting steam into the graphite heat exchanger 1 to meet the process needs inside the graphite heat exchanger 1.

[0033] It should be noted that the graphite heat exchanger is a high-efficiency heat exchange equipment used in chemical, pharmaceutical and other industries, which has excellent corrosion resistance, good thermal conductivity, low viscosity and low friction, etc. According to the search results, the types of graphite heat exchangers include tube type, round block hole type, rectangular block hole type, etc., which can be customized according to the needs of different processes.

[0034] The tube type graphite heat exchanger is usually composed of impermeable graphite tubes and tube sheets, and the fluid can flow inside or outside the tube, and the heat is conducted through the graphite tube wall. This heat exchanger is suitable for high-corrosion chemical fields and can be used for cooling, condensing, absorption, heating and evaporation processes. According to the pressure, temperature and heat transfer efficiency of the process conditions, various types of impermeable graphite tubes can be selected, such as ordinary tubes, medium-temperature treatment tubes, immersion tubes and special reinforced tubes (such as carbon fiber reinforced tubes and high-efficiency plum blossom tubes).

[0035] The design of the graphite heat exchanger is very flexible, which can be designed into tube-in or tube-out flow according to different requirements of corrosive media, and the shell and head can also be selected from various materials and various special structure forms. This heat exchanger is not only compact and durable, but also has high safety and stability, and can run safely and stably for a long time even under harsh working conditions. In addition, the graphite heat exchanger is easy to maintain, has very low downtime cost, and has a long service life

[0036] The utility model discloses a series connection of the condensate water discharge of pickling unit graphite heat exchanger 1 is carried out with 304 stainless steel pipe, and the water collecting pipeline is connected to the pickling rinsing water heating tank, and the generated condensate water is collected, and the water supplementing in the rinsing water heating tank is heated. Usually, in order to understand steam condensate water recovery water quality change in time, ensure that the unit water is normal, need real time detection of the electric conductivity in the rinsing water heating tank, and increase control valve on the condensate water collecting pipeline and graphite heat exchanger connecting pipeline, facilitate the cause search and processing when the water quality is abnormal. The utility model discloses can effectively utilize steam condensate water waste heat and recovery, reduces the energy consumption of pickling unit, realizes energy saving and emission reduction, and reduces the waste of water resources, and then reduces pickling production cost under the premise of guaranteeing unit normal production process and quality, improves the economic benefit of enterprise.

[0037] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0038] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one feature. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0039] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through intermediate medium, can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0042] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pickling unit that efficiently utilizes steam condensate, characterized in that, include: A number of graphite heat exchangers (1), a steam condensate collection pipe (2) and a rinsing tank heating tank (3) are provided. The bottom of the graphite heat exchanger (1) is provided with a condensate outlet (12). The condensate outlet (12) is connected to the steam condensate collection pipe (2) through a first branch pipe. The steam condensate collection pipe (2) inputs condensate into the rinsing tank heating tank (3) through a second branch pipe.

2. The pickling unit for high-efficiency utilization of steam condensate according to claim 1, characterized in that, The first branch pipe is equipped with a first valve (13).

3. The pickling unit for high-efficiency utilization of steam condensate according to claim 2, characterized in that, A second valve (21) is installed on the second branch pipe.

4. A pickling unit for high-efficiency utilization of steam condensate according to claim 3, characterized in that, A third branch pipe is also connected to the steam condensate collection pipe (2).

5. A pickling unit for efficient utilization of steam condensate according to claim 4, characterized in that, A third valve (22) is installed on the third branch pipe.

6. A pickling unit for high-efficiency utilization of steam condensate according to claim 5, characterized in that, The first valve (13), the second valve (21) and the third valve (22) are ball valves or gate valves.

7. A pickling unit for high-efficiency utilization of steam condensate according to claim 4, characterized in that, The steam condensate collection pipe (2), the first branch pipe, the second branch pipe and the third branch pipe are all made of stainless steel.

8. A pickling unit for high-efficiency utilization of steam condensate according to claim 6, characterized in that, The first valve (13), the second valve (21) and the third valve (22) are all made of stainless steel.

9. A pickling unit for high-efficiency utilization of steam condensate according to claim 1, characterized in that, The graphite heat exchanger (1) is configured as two, and the two graphite heat exchangers (1) are respectively connected to the steam condensate collection pipe (2) through a first branch pipe.

10. A pickling unit for efficient utilization of steam condensate according to any one of claims 1-9, characterized in that, The graphite heat exchanger (1) is provided with a steam input port (11) at the top, which is used to input steam into the graphite heat exchanger (1).

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