CN210229168U - Combined downstream central circulating tube evaporator - Google Patents

Abstract

The utility model relates to a combined downstream central circulating tube evaporator, which comprises a multi-effect central circulating tube evaporator and a multi-stage heat exchanger; the multi-effect heat exchangers are communicated in series; the bottom of the central circulating pipe evaporator is provided with a finished liquid discharge pipe and a sewage outlet, and the finished liquid discharge pipe is inserted into the central circulating pipe; the multi-effect central circulating pipe evaporators are communicated in series, and material inlets of the second-effect to last-effect central circulating pipe evaporators are positioned on the side wall below the heating chamber; a finishing liquid discharge pipe of the central circulating pipe evaporator of the previous effect is communicated with a material inlet of the central circulating pipe evaporator of the next effect; the evaporator of the first effect central circulating pipe of the heat exchanger is communicated; the main steam pipeline is communicated with a steam inlet of the central circulating pipe evaporator of the first effect; the evaporator of each effect central circulating pipe is connected with a vacuum pump, and the vacuum degree from the first effect to the last effect is increased progressively. The utility model discloses in do not have solution delivery pump between every effect evaporimeter, investment cost is little, and the running cost is low, and power consumption is few.

Description

Combined downstream central circulating tube evaporator

Technical Field

The utility model belongs to the evaporimeter field especially relates to a modular following current central circulating pipe evaporimeter.

Background

The central circulating tube evaporator belongs to a natural circulation type evaporator, which is a large evaporator widely used in industrial production and has long history, and comprises an upper evaporation chamber and a lower heating chamber, wherein the lower heating chamber comprises a heating tube bundle and a central circulating tube, the sectional area of the central circulating tube is far larger than that of the heating tube bundle, the solution in the heating tube boils upwards, and the central circulating tube cannot reach the temperature in the heating tube due to the large sectional area, so that the solution descends, and the circulation of the solution in the central circulating tube is formed; in order to effectively utilize steam in the prior art, a plurality of evaporators are connected in series for operation, a pump is used for pumping solution from a front-stage evaporator to a rear-stage evaporator in the series operation process, and the pressure difference of the evaporators is also used for enabling the solution to enter the rear-stage evaporator from the front-stage evaporator in the prior art; in addition, in the prior art, the time required for the solution to reach the boiling point of the solution after entering the evaporator is long, and the energy consumption of the evaporator is high.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: an object of the utility model is to provide a modular following current central circulating pipe evaporimeter to prior art not enough.

The utility model discloses an innovation point lies in the utility model discloses in do not have solution delivery pump between every effect evaporimeter, investment cost is little, and the running cost is low, and power consumption is few.

The technical scheme is as follows: in order to achieve the above object, the present invention specifically provides a method for manufacturing a semiconductor device, comprising: a combined concurrent flow central circulating pipe evaporator comprises a multi-effect central circulating pipe evaporator, a multi-stage heat exchanger and a condensed water storage tank; the heat exchanger is provided with a tube side inlet, a tube side outlet, a shell side inlet and a shell side outlet; the multi-effect heat exchanger is communicated in series, and the outlet of the previous stage of tube pass is communicated with the inlet of the next stage of tube pass; the bottom of the central circulating pipe evaporator is provided with a finished liquid discharge pipe and a sewage discharge outlet, the top of the central circulating pipe evaporator is provided with a steam outlet, the interior of the central circulating pipe evaporator is provided with a heating chamber and an evaporation chamber, the side wall of the heating chamber is provided with a steam inlet and a condensate outlet, the heating chamber consists of a heating pipe bundle and a central circulating pipe, and the finished liquid discharge pipe is inserted into the central circulating pipe; the multiple-effect central circulating pipe evaporators are communicated in series, the material inlet of the first-effect central circulating pipe evaporator is positioned on the side wall of the heating chamber, and the material inlets of the second-effect to last-effect central circulating pipe evaporators are positioned on the side wall below the heating chamber; a finishing liquid discharge pipe of the central circulating pipe evaporator of the previous effect is communicated with a material inlet of the central circulating pipe evaporator of the next effect; the steam outlet of the central circulating pipe evaporator of the previous effect is communicated with the steam inlet of the central circulating pipe evaporator of the next effect; the last tube pass outlet of the heat exchanger is communicated with the material inlet of the first effect central circulating tube evaporator; the condensed water outlet is communicated with the heating chamber of the next stage central circulating pipe evaporator through a pipeline or directly introduced into a condensed water storage tank; the main steam pipeline is communicated with a steam inlet of the central circulating pipe evaporator of the first effect; the vacuum degree of the central circulating pipe evaporator is increased from the first effect to the last effect in sequence.

The solution enters the multi-effect central circulating pipe evaporator for preheating in the heat exchanger before entering the multi-effect central circulating pipe evaporator, enters the multi-effect central circulating pipe evaporator when being preheated to be close to the boiling point, has better evaporation effect after entering the multi-effect central circulating pipe evaporator after preheating, is more energy-saving, because the material inlet of the central circulating pipe evaporator from the second effect to the last effect is positioned on the side wall below the heating chamber, the finished liquid discharge pipe is inserted into the central circulating pipe, each central circulating pipe evaporator is connected with a vacuum pump, and the vacuum degree from the first effect to the last effect is gradually increased, so that the solution automatically overflows from the finished liquid discharge pipe of the central circulating pipe evaporator of the previous effect to the material inlet of the central circulating pipe evaporator of the next effect under the action of pressure difference, the investment cost is low, the.

Further, the multistage heat exchanger is two-stage.

Furthermore, the heat exchanger is a steam heat exchanger, and a steam outlet of the final-effect central circulating tube evaporator is communicated with a shell pass inlet of the first-stage heat exchanger through a steam pipeline; a steam branch pipe is also arranged on the steam pipeline and communicated with the condenser; the main steam pipeline is respectively communicated with a shell pass inlet of the last-stage heat exchanger and a steam inlet of the central circulating tube evaporator of the first effect; the shell pass outlet is communicated with a condensed water storage tank. The solution is preheated by utilizing the steam discharged by the final-effect central circulating pipe evaporator, so that the heat energy is utilized to the maximum extent; the communication between the last stage heat exchanger and the main steam pipeline is that the solution enters the multi-effect central circulating tube evaporator after being preheated by the first stage heat exchanger when the temperature of the solution does not meet the requirement after being preheated by the first stage heat exchanger.

Further, the side wall of the evaporation chamber is provided with a manhole. The interior of the central circulating pipe evaporator is convenient to overhaul and clean.

Has the advantages that: compared with the prior art, the utility model, have following advantage:

1. the utility model discloses in do not have solution delivery pump between every effect evaporimeter, investment cost is little, and the running cost is low, and power consumption is few.

2. The utility model discloses in to steam repetitious utilization, heat energy reaches the maximize and utilizes.

3. The utility model discloses in preheat solution earlier before getting into multiple-effect central circulating tube evaporimeter, later stage evaporation effect is better.

4. The utility model discloses in conveniently overhaul and wash inside the central circulation pipe evaporimeter.

Drawings

Fig. 1 is a schematic structural view of embodiment 1.

FIG. 2 is a schematic diagram of the second to last effect central tube evaporators.

Detailed Description

Example 1, as shown in fig. 1, a combined concurrent central circulation tube evaporator comprises a multi-effect central circulation tube evaporator 1, a multi-stage heat exchanger 2, a condensed water storage tank 3; the heat exchanger 2 is provided with a tube side inlet 2.1, a tube side outlet 2.2, a shell side inlet 2.3 and a shell side outlet 2.4; the multi-effect heat exchanger 2 is communicated in series, and the outlet 2.2 of the previous stage of tube pass is communicated with the inlet 2.1 of the next stage of tube pass; the bottom of the central circulating pipe evaporator 1 is provided with a finished liquid discharge pipe 1.1 and a sewage discharge outlet 1.2, the top is provided with a steam outlet 1.3, the inside is provided with a heating chamber 4 and an evaporation chamber 5, and the side wall of the evaporation chamber 5 is provided with a manhole 9. The side wall of the heating chamber 4 is provided with a steam inlet 4.1 and a condensed water outlet 4.2, the heating chamber 4 consists of a heating tube bundle 4.3 and a central circulating tube 4.4, and a finished liquid discharge tube 1.1 is inserted into the central circulating tube 4.4; the multiple-effect central circulating pipe evaporators 1 are communicated in a series connection mode, a material inlet 1.4 of the first-effect central circulating pipe evaporator 1 is positioned on the side wall of the heating chamber 4, and a material inlet 1.4 of the second-effect to last-effect central circulating pipe evaporator 1 is positioned on the side wall below the heating chamber 4; a finished liquid discharge pipe 1.1 of the central circulating pipe evaporator 1 of the previous effect is communicated with a material inlet 1.4 of the central circulating pipe evaporator 1 of the next effect; a steam outlet 1.3 of the central circulating pipe evaporator 1 of the previous effect is communicated with a steam inlet 4.1 of the central circulating pipe evaporator of the next effect; a tube pass outlet 2.2 of the last effect of the heat exchanger 2 is communicated with a material inlet 1.4 of the first effect central circulating tube evaporator 1; a condensed water outlet 4.2 is communicated with a heating chamber 4 of the next-stage central circulating pipe evaporator 1 through a pipeline or directly introduced into a condensed water storage tank 3; the main steam pipeline 6 is communicated with a steam inlet of the central circulating tube evaporator 1 of the first effect; the vacuum degree of the central circulating tube evaporator 1 is increased from the first effect to the last effect in sequence. Preferably, the multistage heat exchanger 2 is a second-stage heat exchanger, the heat exchanger 2 is a steam heat exchanger, and a steam outlet 1.3 of the final-effect central circulating tube evaporator 1 is communicated with a shell pass inlet 2.1 of the first-stage heat exchanger 2 through a steam pipeline 7; a steam branch pipe is also arranged on the steam pipeline 7 and is communicated with a condenser 8; the main steam pipeline 6 is respectively communicated with a shell pass inlet 2.3 of the final-stage heat exchanger 2 and a steam inlet 1.3 of the central circulating tube evaporator 1 of the first effect; the shell side outlet 2.4 is communicated with a condensed water storage tank 3.

The solution enters the heat exchanger 2 from the tube side inlet 2.1 for preheating, then enters the next-stage heat exchanger 2 from the tube side outlet 2.2, is preheated to be close to the boiling point of the solution in the last-stage heat exchanger 2, is discharged from the tube side outlet 2.2, enters the central circulating tube evaporator 1 from the material inlet 1.4, flows into the heating chamber 4 from the material inlet 1.4 for heating and evaporation, is boiled and raised by the heating tube bundle 4.3 after entering from the material inlet 1.4 of the central circulating tube evaporator 1 under the action of pressure difference, and then descends into the next-stage central circulating tube evaporator 1 through the central circulating tube 4.4 until being discharged finally; steam enters a heating chamber of the first-effect central circulating tube evaporator 1 from a main steam pipeline 6 and then enters a steam inlet 4.1 of the second-effect central circulating tube evaporator 1 from a steam outlet 1.3 of the first-effect central circulating tube evaporator 1; finally, the steam is discharged from a steam outlet 1.3 of the central circulating tube evaporator 1 of the last effect into a shell side inlet 2.3 of the first-stage heat exchanger 2 through a steam pipeline 7, and then is discharged from a shell side outlet 2.4 into a condensed water storage tank 3, and the redundant steam is discharged from a steam outlet 1.3 into a condenser 8. Steam enters the final heat exchanger 2 from the main steam line 6 to preheat the solution.

Claims (4)

1. A combined concurrent flow central circulating pipe evaporator is characterized by comprising a multi-effect central circulating pipe evaporator, a multi-stage heat exchanger and a condensed water storage tank; the heat exchanger is provided with a tube side inlet, a tube side outlet, a shell side inlet and a shell side outlet; the multi-effect heat exchanger is communicated in series, and the outlet of the previous stage of tube pass is communicated with the inlet of the next stage of tube pass; the bottom of the central circulating pipe evaporator is provided with a finished liquid discharge pipe and a sewage discharge outlet, the top of the central circulating pipe evaporator is provided with a steam outlet, the interior of the central circulating pipe evaporator is provided with a heating chamber and an evaporation chamber, the side wall of the heating chamber is provided with a steam inlet and a condensate outlet, the heating chamber consists of a heating pipe bundle and a central circulating pipe, and the finished liquid discharge pipe is inserted into the central circulating pipe; the multiple-effect central circulating pipe evaporators are communicated in series, the material inlet of the first-effect central circulating pipe evaporator is positioned on the side wall of the heating chamber, and the material inlets of the second-effect to last-effect central circulating pipe evaporators are positioned on the side wall below the heating chamber; a finishing liquid discharge pipe of the central circulating pipe evaporator of the previous effect is communicated with a material inlet of the central circulating pipe evaporator of the next effect; the steam outlet of the central circulating pipe evaporator of the previous effect is communicated with the steam inlet of the central circulating pipe evaporator of the next effect; the last tube pass outlet of the heat exchanger is communicated with the material inlet of the first effect central circulating tube evaporator; the condensed water outlet is communicated with the heating chamber of the next stage central circulating pipe evaporator through a pipeline or directly introduced into a condensed water storage tank; the main steam pipeline is communicated with a steam inlet of the central circulating pipe evaporator of the first effect; the vacuum degree of the central circulating pipe evaporator is increased from the first effect to the last effect in sequence.

2. The combined forward flow central circulation tube evaporator of claim 1 wherein the multi-stage heat exchanger is two-stage.

3. The combined concurrent central circulating tube evaporator of claim 2, wherein the heat exchanger is a steam heat exchanger, and a steam outlet of the last effect central circulating tube evaporator is communicated with a shell side inlet of the first stage heat exchanger through a steam pipeline; a steam branch pipe is also arranged on the steam pipeline and communicated with the condenser; the main steam pipeline is respectively communicated with a shell pass inlet of the last-stage heat exchanger and a steam inlet of the central circulating tube evaporator of the first effect; the shell pass outlet is communicated with a condensed water storage tank.

4. The combined forward flow central circulation tube evaporator of claim 1 wherein the evaporation chamber side wall is provided with a manhole.

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