Novel energy-saving heat recovery system

Abstract

The invention belongs to the technical field of heat recovery, and particularly relates to a novel energy-saving heat recovery system which comprises a tower, a recycling assembly comprises two sets of tower top plate heat exchangers arranged in a bilateral symmetry mode and two sets of separating towers connected into the tower, and a second gas phase pipeline communicates with the tower top plate heat exchangers and a circulating tower. The compressor compresses and heats water vapor generated by the tower top plate heat exchanger and the separating tower, a tower top gas phase is introduced into the tower top plate heat exchanger, water in the heat exchanger is heated to be boiled by utilizing a tower top gas phase of the circulating tower, forced circulation is carried out between the tower top plate heat exchanger and the separator through the circulating pump, and the water vapor is generated. The method comprises the following steps: absorbing latent heat of vaporization of a gas phase at the top of a circulating tower, after the gas phase at the top of the circulating tower releases the latent heat of vaporization, condensing into a liquid state at a high temperature of 138 DEG C, introducing water vapor generated by a plate heat exchanger at the top of the tower and a separator into a compressor, and after the water vapor is compressed, increasing the pressure to 1000KpaA and the temperature to 175.38 DEG C through the cooperation of the compressor and a condensate preheater at the top of the tower; and supplying to a reboiler for use.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving heat recovery, and in particular to a new energy-saving heat recovery system. Background Art

[0002] The formaldehyde circulation tower is mainly used to treat formaldehyde waste gas. It has the advantages of high efficiency purification, energy saving and environmental protection, recyclability and safety and reliability. It is widely used in the treatment of formaldehyde waste gas in chemical, pharmaceutical, paint, rubber and other industries. The main functions include waste gas treatment. The formaldehyde circulation tower uses a spray absorption method to increase the contact area between the waste gas and the absorption liquid using a filler layer, effectively removing formaldehyde in the waste gas and converting it into harmless substances to achieve air purification.

[0003] In the original process, the high-heat (temperature 145°C) gaseous material at the top of the formaldehyde circulation tower is directly cooled through a contact condenser, and its high heat is taken away by the circulating cooling water. The high heat loss leads to a large loss of economic benefits. Therefore, it is urgent to provide a new energy-saving heat recovery system. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid blurring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] Therefore, the purpose of the present invention is to provide a new energy-saving heat recovery system, which introduces the top gas phase into the top plate heat exchanger of the tower, utilizes the top gas phase of the circulating tower to heat the water in the heat exchanger to boiling, and uses a circulating pump to force circulation between the top plate heat exchanger and the separator to generate water vapor, which absorbs the latent heat of vaporization of the top gas phase of the circulating tower. After the top gas phase of the circulating tower releases the latent heat of vaporization, it condenses into a liquid at a high temperature of 138°C. The water vapor generated by the top plate heat exchanger and the separator is introduced into a compressor because its temperature is lower than that of the tower kettle. The compressor cooperates with the top condensate preheater to increase the pressure of the water vapor to 1000 kPaA and the temperature to 175.38°C after compression, and is supplied to the reboiler for use.

[0006] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A new energy-saving heat recovery system, comprising:

[0008] A tower frame is used as a connection frame, and a circulation tower is set on the tower frame. The outer sides of the circulation tower are connected to the gas phase pipeline 1 and the gas phase pipeline 2 respectively;

[0009] The recycling component is connected to the tower frame and includes two sets of tower top plate heat exchangers arranged symmetrically on the left and right, and two sets of separation towers connected to the tower frame. The gas phase pipeline 2 connects the tower top plate heat exchanger and the circulation tower, and a circulation pump is connected to the tower frame;

[0010] The compressor is connected to the tower frame and compresses and heats the water vapor generated by the tower top plate heat exchanger and the separation tower.

[0011] As a preferred solution of the new energy-saving heat recovery system described in the present invention, the tower top plate heat exchanger is arranged in a one-to-one correspondence with the separation tower, and the two groups of separation towers are connected to the circulation pump through a gas phase pipeline, and the gas phase outlet of the separation tower is connected with a connecting pipe.

[0012] As a preferred solution of the new energy-saving heat recovery system described in the present invention, the other end of the connecting pipe is connected to the top condensate preheater, the top condensate preheater is installed in the tower frame, and the output port of the top condensate preheater is set corresponding to the compressor.

[0013] As a preferred solution of the new energy-saving heat recovery system described in the present invention, the compressor includes a compressor connected to the bottom of the tower, the compressor input port is connected to the output port of the condensate preheater at the top of the tower, the compressor output port is connected to a second pipeline, and the other end of the second pipeline is connected to the reboiler.

[0014] As a preferred solution of the new energy-saving heat recovery system described in the present invention, the tower top plate heat exchanger adopts a fully welded plate heat exchanger, which is composed of multiple groups of metal wave effect mosquitoes, rubber gaskets, fixed pressure plates, movable pressure plates, upper and lower guide rods and compression screws. The heat exchanger plates are made of titanium and stainless steel composite plates, combined with double sealing of rubber gaskets and welding technology to ensure corrosion resistance and long-term sealing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The top gas phase is introduced into the top plate heat exchanger of the tower, and the top gas phase of the circulating tower is used to heat the water in the heat exchanger to boiling. The top plate heat exchanger and the separator are forced to circulate through a circulating pump to generate water vapor, which absorbs the latent heat of vaporization of the top gas phase of the circulating tower. After the top gas phase of the circulating tower releases the latent heat of vaporization, it condenses into liquid at a high temperature of 138°C. The water vapor generated by the top plate heat exchanger and the separator is lower than the temperature of the tower kettle, so the water vapor is introduced into the compressor. Through the cooperation of the compressor and the top condensate preheater, the water vapor is compressed and the pressure rises to 1000KPaA and the temperature is 175.38°C, and is supplied to the reboiler for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a partial structural diagram of the present invention;

[0020] In the figure: 100 tower frame, 110 circulating tower gas from the formaldehyde circulating tower, 111 circulating liquid pipeline 1, 112 circulating pipeline 2, 200 recycling component, 210 tower top plate heat exchanger, 220 separation tower, 221 compressor inlet bypass, 230 tower top condensate preheater, 240 circulating pump, 300 compressor, 310 compressor second stage inlet, 311 compressor first stage outlet, 320 compressor main motor. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] The present invention provides a new energy-saving heat recovery system. Figure 1-2 , including a tower 100, a recycling assembly 200, a tower top plate heat exchanger 210, a separation tower 220, a tower top condensate preheater 230 and a compressor 300;

[0026] Please continue reading Figure 1-2The tower 100 is connected to the base frame, and a tower top plate heat exchanger 210 is provided on the tower 100. The outer side of the tower top plate heat exchanger 210 is connected to a circulating liquid pipeline 111 and a gas phase pipeline 2 112 respectively.

[0027] Please continue reading Figure 1-2 The recycling assembly 200 is threadedly connected to the tower 100 and includes two sets of symmetrically arranged tower top plate heat exchangers 210 and two sets of separation towers 220 screwed into the tower 100. The gas phase pipeline 112 is connected to the tower top condensate preheater 230, and a circulation pump 240 is threadedly connected to the tower 100.

[0028] The other end of the compressor inlet bypass 221 is connected to the separation tower 220, the top condensate preheater 230 is screwed into the tower frame 100, and the output port of the top separation tower 220 is corresponding to the compressor 300;

[0029] Please continue reading Figure 1-2 , the compressor 300 is connected to the tower 100, and the water vapor generated by the tower top plate heat exchanger 210 and the separation tower 220 is compressed and heated;

[0030] The compressor 300 includes a compressor 310 connected to the bottom of the tower 100. The input port of the compressor 310 is connected to the output port of the separation tower 220. One end of the pipeline 311 is connected to the output port of the first stage of the compressor 310, and the other end is connected to the inlet of the second stage of the compressor 310. The outlet of the second stage of the compressor 310 is provided with a pipeline 321 connected to the reboiler (E8106) of the original system; and the reboiler (E8106) is provided corresponding to the circulation tower 110.

[0031] The tower top plate heat exchanger 210 is composed of multiple sets of metal corrugated plates, rubber gaskets, fixed and movable pressure plates, upper and lower guide rods, and compression screws. The heat exchanger plates are made of a titanium and stainless steel composite sheet. The rubber gaskets and welding process provide a double seal to ensure corrosion resistance and long-term sealing. The plates have four corner holes for the two heat transfer media to pass through. The metal plates are mounted within a frame with fixed and movable pressure plates and clamped with clamping bolts. Sealing gaskets are installed on the plates to seal the two fluid channels, directing the fluids to flow alternately into their respective channels to achieve heat exchange. Each medium has an inlet and outlet.

[0032] Working principle: When the invention is in use, the top gas phase is introduced into the top plate heat exchanger 210, and the top gas phase of the circulating tower 110 is used to heat the water in the heat exchanger to boiling. The top plate heat exchanger 210 and the separator 220 are forced to circulate through the circulating pump 240 to generate water vapor, which absorbs the latent heat of vaporization of the top gas phase of the circulating tower 110. After the top gas phase of the circulating tower 110 releases the latent heat of vaporization, it condenses into liquid at a high temperature of 138°C. The water vapor generated by the top plate heat exchanger 210 and the separator 220 is introduced into the compressor 310 because its temperature is lower than the tower kettle temperature. The compressor 310 cooperates with the top plate heat exchanger 210 and the separator 220 so that after compression, the pressure of the water vapor rises to 1000KpaA and the temperature is 175.38°C, and is supplied to the reboiler (E8106) for use.

[0033] Although the present invention has been described above with reference to embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of such combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A new energy-saving heat recovery system, characterized in that: include: A tower frame (100) is connected to the base frame. Circulating tower gas (110) from a V8107 formaldehyde circulating tower is provided on the tower frame (100) to enter a tower top plate heat exchanger (210). A circulating liquid pipeline 1 (111) and a gas phase pipeline 2 (112) are respectively connected to the outside of the tower top plate heat exchanger (210). The recycling assembly (200) is connected to the tower (100) and includes two sets of tower top plate heat exchangers (210) arranged in a bilaterally symmetrical manner, and two sets of separation towers (220) connected to the tower (100). The second gas phase pipeline (112) is connected to the tower top plate heat exchanger (210), and the tower (100) is connected to a circulation pump (240); The compressor (300) is connected to the tower (100) and compresses and heats the water vapor generated by the tower top plate heat exchanger (210) and the separation tower (220).

2. A new energy-saving heat recovery system according to claim 1, characterized in that: The two groups of the tower top plate heat exchangers (210) are arranged in a one-to-one correspondence with the separation tower (220), and the two groups of separation towers (220) are connected to the circulation pump (240) through a circulating liquid pipeline (111), and the gas phase outlet of the separation tower (220) is connected to the inlet (311) at one end of the compressor.

3. A new energy-saving heat recovery system according to claim 2, characterized in that: The separation tower (220) is connected to a compressor inlet bypass (221), the other end of which is connected to a tower top condensate preheater (230), which is installed in a tower frame (100), and an output port of the tower top condensate preheater (230) is correspondingly arranged to the compressor (300).

4. A new energy-saving heat recovery system according to claim 2, characterized in that: The compressor (300) includes a compressor (310) connected to the bottom of the tower (100), the second stage inlet (310) of the compressor is connected to the output port of the separation tower (220), and the first stage outlet (311) of the compressor is connected to the second stage inlet (310) of the compressor.

5. A new energy-saving heat recovery system according to claim 4, characterized in that: The tower top plate heat exchanger (210) is a fully welded plate heat exchanger, which is composed of multiple groups of metal wave effect mosquitoes, rubber gaskets, fixed pressing plates, movable pressing plates, upper and lower guide rods, and pressing screws.

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