Energy-saving device of steam generator

Abstract

The utility model provides a steam generator energy-saving device which comprises a rectifying tower and a steam pressure-stabilizing buffer tank, a stock solution reboiler is arranged on the side face of the rectifying tower, one end of the stock solution reboiler is communicated with the lower end of the rectifying tower, the top end of the stock solution reboiler is communicated with the side face of the rectifying tower, and the other end of the stock solution reboiler is communicated with the steam pressure-stabilizing buffer tank. The end face of one side of the stock solution reboiler is communicated with a steam input pipeline, and the other side of the stock solution reboiler is communicated with a steam condensate pipeline. According to the scheme, the tower top steam and the desalted water are subjected to heat exchange through the tubular steam generator, the desalted water absorbs latent heat of vaporization of phenol gas with the tower top temperature higher than 100 DEG C through the steam generator, and the desalted water is vaporized under a certain operation condition, so that heat transfer is realized; according to the scheme, the saturated steam with the temperature rise being lower than or equal to 100 DEG C is compressed through the compressor to serve as a heat source of the device or other devices to be recycled, and continuous recovery of heat can be achieved through the process.

Description

Technical Field

[0001] The utility model relates to the technical field of steamers, in particular to an energy-saving device for a steam generator. Background Technique

[0002] In modern industrial production, the efficient utilization and recovery of heat energy have become key factors in energy conservation, emission reduction, and improving resource utilization efficiency. Taking the crude phenol rectification unit in the production plant of a new material technology company in Shandong as an example, in its existing 20,000-ton / year crude phenol separation unit, the gas phase quality at the top of the supporting crude phenol rectification tower is as high as 8.81 t / h. Currently, water cooling is used for condensation and cooling, and a large amount of heat energy is lost with the cooling water in this process, resulting in significant heat energy waste and an increased environmental burden.

[0003] To effectively solve this problem, we introduced and optimized the mechanical vapor recompression technology, and achieved in-depth recovery and efficient utilization of heat energy through technological innovation. The core of the mechanical vapor recompression technology is to generate low-temperature and low-pressure steam by exchanging heat of the vapor latent heat of the top materials of rectification towers, deammoniation towers, reaction towers, etc. with desalted water, and then use a multi-stage high-temperature rise compressor for mechanical work compression to increase its temperature and pressure, thereby increasing its enthalpy value. The compressed high-temperature steam then returns to the original bottom reboiler or other subsequent processes for heating use, realizing the maximum utilization of the heat of materials in rectification towers, deammoniation towers, reaction towers, etc. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides an energy-saving device for a steam generator, which solves the problems raised in the above background technique.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions: An energy-saving device for a steam generator includes a rectification tower and a steam pressure stabilizing buffer tank. A raw liquid reboiler is provided on the side of the rectification tower. One end of the raw liquid reboiler is connected to the lower end of the rectification tower, the top end of the raw liquid reboiler is connected to the side of the rectification tower, a steam input pipeline is connected to one end face of the raw liquid reboiler, a steam condensate pipeline is connected to the other side of the raw liquid reboiler, a raw liquid input pipeline is connected to the top end of the side of the rectification tower, a shell-and-tube steam generator is provided on one side of the rectification tower, and four interfaces are respectively provided on the surface of the shell-and-tube steam generator. An interface on one side is connected to a desalted water pipeline, and an interface on the other side is connected to a low-pressure steam output pipe, and the low-pressure steam output pipe is connected to the top end of the steam pressure stabilizing buffer tank.

[0008] Preferably, a top output pipeline is communicatively connected between one side of the top interface of the tube-in-tube steam generator and the top of the rectification column.

[0009] Preferably, a raw liquid condenser is provided between the tube-in-tube steam generator and the rectification column, and the raw liquid condenser is communicatively connected to one side of the top output pipeline.

[0010] Preferably, control valves are respectively provided at the communicative connection positions of the top output pipeline with the tube-in-tube steam generator and the raw liquid condenser, and one side of the raw liquid condenser is communicatively connected to the bottom interface of the tube-in-tube steam generator.

[0011] Preferably, a circulating water condenser is provided on one side of the raw liquid condenser, and the inlet of the circulating water condenser is communicatively connected to the outlet of the raw liquid condenser.

[0012] Preferably, a separation tank is provided on one side of the circulating water condenser, and the circulating water condenser is communicatively connected to the inlet of the separation tank.

[0013] Preferably, a material pump group is fixedly provided on one side of the separation tank, the separation tank is communicatively connected to the material pump group, and one side of the separation tank is communicatively connected to the side reflux port of the rectification column.

[0014] Preferably, two steam pressure stabilizing and buffering tanks are juxtaposed. The inlet of the steam pressure stabilizing and buffering tank on one side is communicatively connected to the low-pressure steam output pipe. A steam compressor is communicatively connected to the top of the steam pressure stabilizing and buffering tank on the other side. A communicating pipeline is communicatively connected between the inlet of the steam compressor and the bottom outlet of the steam pressure stabilizing and buffering tank on one side.

[0015] Preferably, a steam output pipe is communicatively connected to the bottom outlet of the steam pressure stabilizing and buffering tank on the other side.

[0016] (III) Beneficial Effects

[0017] The present utility model provides a steam generator energy-saving device, which has the following beneficial effects:

[0018] 1. In this solution, heat exchange is carried out between the top steam and the demineralized water through the tube-in-tube evaporator. The demineralized water absorbs the latent heat of vaporization of the top phenol gas through the steam generator, and the demineralized water vaporizes under certain operating conditions, realizing heat transfer.

[0019] 2. In this solution, the compressor is used to compress, increase the temperature and pressure to low-pressure steam at a temperature of 152 °C and a pressure of 0.4 MPaG as the heat source for the rest of the device to be recycled, and this process can realize continuous heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the process flow diagram of the rectification column reaction of the present utility model;

[0021] Figure 2 This is the process flow diagram of the steam pressure stabilizing module of the present utility model.

[0022] In the figure: 101, rectifying column; 102, stock solution reboiler; 103, steam condensate pipeline; 104, steam input pipeline; 105, stock solution input pipeline; 106, demineralized water pipeline; 107, low-pressure steam output pipe; 108, shell-and-tube steam generator; 109, stock solution condenser; 110, circulating water condenser; 111, separation tank; 112, material pump group; 113, steam pressure stabilizing buffer tank; 114, connecting pipeline; 115, steam compressor; 116, steam output pipe; 117, top output pipeline; 118, control valve. Specific embodiments

[0023] An embodiment of the present utility model provides an energy-saving device for a steam generator, as Figure 1-2 shown, including a rectifying column 101 and a steam pressure stabilizing buffer tank 113. A stock solution reboiler 102 is provided on the side of the rectifying column 101. One end of the stock solution reboiler 102 is connected to the lower end of the rectifying column 101, and the top end of the stock solution reboiler 102 is connected to the side of the rectifying column 101. A steam input pipeline 104 is connected and provided on one side end face of the stock solution reboiler 102, and a steam condensate pipeline 103 is connected and provided on the other side of the stock solution reboiler 102. A stock solution input pipeline 105 is connected and provided at the top end of the side of the rectifying column 101. A shell-and-tube steam generator 108 is provided on one side of the rectifying column 101. The surface of the shell-and-tube steam generator 108 is respectively provided with four interfaces. An interface on one side is connected and provided with a demineralized water pipeline 106, and an interface on the other side is connected and provided with a low-pressure steam output pipe 107. The low-pressure steam output pipe 107 is connected to the top end of the steam pressure stabilizing buffer tank 113.

[0024] It should be further noted that the shell-and-tube steam generator is a shell-and-tube heat exchanger, generally arranged vertically or horizontally. It is preferably horizontal for small transformation space and simple layout. The material at the top of the rectifying column passes through the shell side for inlet and outlet, and the demineralized water passes through the tube side for inlet, and the output is a mixture of steam and demineralized water.

[0025] Furthermore, a top output pipeline 117 is connected and provided between the top end interface of the shell-and-tube steam generator 108 and the top end of the rectifying column 101.

[0026] Furthermore, a stock solution condenser 109 is provided between the shell-and-tube steam generator 108 and the rectifying column 101, and the stock solution condenser 109 is connected to one side of the top output pipeline 117.

[0027] Furthermore, control valves 118 are respectively provided at the connecting positions of the top output pipeline 117 with the shell-and-tube steam generator 108 and the stock solution condenser 109. One side of the stock solution condenser 109 is connected to the bottom interface of the shell-and-tube steam generator 108.

[0028] Furthermore, a circulating water condenser 110 is provided on one side of the stock solution condenser 109, and the inlet of the circulating water condenser 110 is communicated with the outlet of the stock solution condenser 109.

[0029] Furthermore, a separation tank 111 is provided on one side of the circulating water condenser 110, and the circulating water condenser 110 is communicated with the inlet of the separation tank 111.

[0030] Furthermore, a material pump group 112 is fixedly provided on one side of the separation tank 111. The separation tank 111 is communicated with the material pump group 112, and one side of the separation tank 111 is communicated with the side reflux port of the rectification column 101.

[0031] Furthermore, two steam pressure stabilizing buffer tanks 113 are juxtaposed. The inlet of the steam pressure stabilizing buffer tank 113 on one side is communicated with the low-pressure steam output pipe 107. The top of the steam pressure stabilizing buffer tank 113 on the other side is communicated with a steam compressor 115, and a connecting pipe 114 is communicated between the inlet of the steam compressor 115 and the bottom outlet of the steam pressure stabilizing buffer tank 113 on one side.

[0032] It should be noted that steam is input into the steam compressor 115 through the connecting pipe 114.

[0033] Furthermore, the bottom outlet of the steam pressure stabilizing buffer tank 113 on the other side is communicated with a steam output pipe 116.

[0034] It should be further noted that the steam output pipe 116 is communicated with the output pipe for steam use.

[0035] When using this solution, first drive each component to install and connect the pipeline. The following instructions use the production process of phenol for illustration. The phenol raw material is input into the distillation column 101 through the stock solution input pipeline 105, and is reboiled by the stock solution reboiler 102 through the connection between the bottom of the distillation column 101 and the stock solution reboiler 102. Then, it flows back into the distillation column 101. The steam mixed with phenol in the distillation column 101 is output to the shell-and-tube steam generator 108 through the top of the distillation column 101 connected to the top output pipeline 117, and the on-off control of the pipeline is carried out through the control valve 118. Subsequently, demineralized water is input through the demineralized water pipeline 106 and heat exchange is carried out through the shell-and-tube steam generator 108. Then, after the demineralized water absorbs the latent heat of vaporization of the phenol gas through the shell-and-tube steam generator 108, the demineralized water vaporizes to achieve heat transfer. Subsequently, the demineralized water that has absorbed the latent heat of the phenol gas in the gas phase will generate low-temperature steam (115°C) under certain operating conditions. Then, the low-temperature steam is input into the steam pressure stabilizing buffer tank 113 on one side through the low-pressure steam output pipe 107, stored and collected, and then output to the steam compressor 115 through the connecting pipeline 114. After being pressurized to a temperature of 152°C and a pressure of 0.4 MPaG, it is input into another steam pressure stabilizing buffer tank 113 for pressure stabilizing and buffering. Subsequently, the compressed high-pressure steam is used as the heat source for the remaining devices to circulate through the steam output pipe 116. This process can achieve continuous heat recovery.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam generator energy-saving device, comprising a distillation tower (101) and a steam pressure stabilizing buffer tank (113), characterized in that: A raw liquid reboiler (102) is provided on the side of the distillation tower (101), one end of the raw liquid reboiler (102) is connected to the lower end of the distillation tower (101), the top of the raw liquid reboiler (102) is connected to the side of the distillation tower (101), one end surface of the raw liquid reboiler (102) is connected to a steam input pipeline (104), the other side of the raw liquid reboiler (102) is connected to a steam condensate pipeline (103), the side of the distillation tower (101) is connected to a raw liquid input pipeline (105), and a shell-and-tube steam generator (108) is provided on one side of the distillation tower (101), and four interfaces are respectively provided on the surface of the shell-and-tube steam generator (108), one interface of which is connected to a desalted water pipeline (106), and the other interface of which is connected to a low-pressure steam output pipe (107), and the low-pressure steam output pipe (107) is connected to the top of the steam pressure stabilizing buffer tank (113).

2. A steam generator energy saving device according to claim 1, characterized in that: A tower top output pipeline (117) is provided between one side of the top interface of the tube-in-tube steam generator (108) and the top of the distillation tower (101).

3. A steam generator energy saving device according to claim 2, characterized in that: A raw liquid condenser (109) is provided between the shell-and-tube steam generator (108) and the distillation tower (101), and the raw liquid condenser (109) is connected to one side of the tower top output pipeline (117).

4. A steam generator energy saving device according to claim 3, characterized in that: Control valves (118) are respectively provided at the positions where the tower top output pipeline (117) communicates with the shell-and-tube steam generator (108) and the raw liquid condenser (109), and one side of the raw liquid condenser (109) is communicated with the bottom interface of the shell-and-tube steam generator (108).

5. A steam generator energy saving device according to claim 4, characterized in that: A circulating water condenser (110) is provided on one side of the raw liquid condenser (109), and the inlet of the circulating water condenser (110) is connected to the outlet of the raw liquid condenser (109).

6. A steam generator energy saving device according to claim 5, characterized in that: A separation tank (111) is provided on one side of the circulating water condenser (110), and the circulating water condenser (110) is connected to an inlet of the separation tank (111).

7. A steam generator energy saving device according to claim 6, characterized in that: A material pump group (112) is fixedly provided on one side of the separation tank (111), the separation tank (111) is in communication with the material pump group (112), and one side of the separation tank (111) is in communication with a side reflux port of the distillation tower (101).

8. A steam generator energy saving device according to claim 1, characterized in that: The two steam pressure stabilizing buffer tanks (113) are arranged side by side, the inlet of the steam pressure stabilizing buffer tank (113) on one side is connected to the low-pressure steam output pipe (107), the top of the steam pressure stabilizing buffer tank (113) on the other side is connected to a steam compressor (115), and a connecting pipe (114) is provided between the inlet of the steam compressor (115) and the bottom outlet of the steam pressure stabilizing buffer tank (113) on one side.

9. A steam generator energy saving device according to claim 8, characterized in that: The bottom outlet of the steam pressure stabilizing buffer tank (113) on the other side is connected to a steam output pipe (116).

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