CN218709344U - Desulfurization waste water decrement system of two-effect flash distillation - Google Patents

Abstract

The utility model discloses a desulfurization waste water decrement system of double-effect flash evaporation, which comprises a feed pump, a first-effect flash evaporator, a first-effect evaporation circulating pump, a first-effect heat exchanger, a second-effect flash evaporator, a second-effect heat exchanger, a second-effect evaporation circulating pump, a condenser, a condensate tank and a reuse water pump; the first-effect heat exchanger, the condenser and the second-effect heat exchanger are communicated with a condensation water tank, and an inlet of the recycling water pump is communicated with the condensation water tank. Has the advantages that: through the evaporation treatment of the desulfurization wastewater, the maximum wastewater recovery rate can reach 95%, the concentration is continuously and automatically adjusted to 50% -95%, and after flash evaporation, the water evaporated and condensed from the desulfurization wastewater belongs to distilled product water and can be used for boiler water supplement. High recovery rate of wastewater, excellent quality of recovered water and capability of realizing the reduction treatment of wastewater. The waste heat can be recovered, the recovered water is condensed by flash steam, and the heat for cooling in the condensation process can be used for supplying heat or bathing water, so that the full utilization of the waste heat is realized. The decrement zero emission treatment of the system is better realized.

Description

Desulfurization waste water decrement system of two-effect flash distillation

The technical field is as follows:

the utility model relates to a desulfurization effluent disposal system especially relates to a desulfurization waste water decrement system of two effect flash distillations.

Background art:

after the problem of atmospheric pollution is solved, most of main characteristic pollutants such as heavy metal, chloride ions and the like are transferred into the desulfurization wastewater, so that the environment is greatly damaged. At present, the desulfurization wastewater can be treated only by a traditional treatment method, so that most of pollutants in the wastewater are reduced, and the turbidity, the heavy metal concentration and a small amount of hardness of the wastewater are mainly reduced by a traditional triple-box chemical precipitation method process. Because the salt content and the chloride ion concentration of the wastewater are not reduced, the desulfurization wastewater is difficult to be completely recycled in a power plant system. Therefore, in order to realize zero emission of the desulfurization wastewater, the zero emission of the desulfurization wastewater can be really realized only by a concentration reduction or solidification mode.

The utility model has the following contents:

an object of the utility model is to provide a desulfurization waste water decrement system of two-effect flash distillation has solved among the prior art traditional three-header method desulfurization waste water effluent and has contained the salt content height, the running cost is high, the unable retrieval and utilization scheduling problem of mud, has realized the zero release of desulfurization waste water in the true sense.

The utility model discloses by following technical scheme implement: a desulfurization wastewater decrement system with double-effect flash evaporation comprises a feeding pump, a first-effect flash evaporator, a first-effect evaporation circulating pump, a first-effect heat exchanger, a second-effect flash evaporator, a second-effect heat exchanger, a second-effect evaporation circulating pump, a condenser, a condensate water tank and a reuse water pump; the discharge hole of the feeding pump is communicated with the feed hole of the primary-effect flash evaporator, and the air outlet of the primary-effect flash evaporator is communicated with the shell side inlet of the secondary-effect heat exchanger; the discharge hole of the primary-effect flash evaporator is respectively communicated with the feed inlet of the primary-effect evaporation circulating pump and the feed inlet of the secondary-effect flash evaporator, and the discharge hole of the primary-effect evaporation circulating pump is communicated with the tube pass inlet of the primary-effect heat exchanger; a tube pass outlet of the primary-effect heat exchanger is communicated with an air inlet of the primary-effect flash evaporator; the shell pass inlet of the primary heat exchanger is communicated with a steam gas source; the air outlet of the double-effect flash evaporator is communicated with the air inlet of the condenser, and the water inlet of the condenser is communicated with a cooling water source; the discharge hole of the double-effect flash evaporator is respectively communicated with the feed inlet of the double-effect evaporation circulating pump and the sedimentation tank, the inlet of the discharge pump is communicated with the sedimentation tank, and the discharge hole of the double-effect evaporation circulating pump is communicated with the tube pass inlet of the double-effect heat exchanger; a tube pass outlet of the double-effect heat exchanger is communicated with an air inlet of the double-effect flash evaporator; and the shell pass outlet of the first-effect heat exchanger, the water outlet of the condenser and the shell pass outlet of the second-effect heat exchanger are communicated with the condensate tank, and the inlet of the reuse water pump is communicated with the condensate tank.

Preferably, the first-effect heat exchanger and the second-effect heat exchanger are both shell-and-tube heat exchangers.

The utility model has the advantages that: as for the traditional process, a three-header pretreatment system is not needed, so that the high medicament cost and the operation cost are reduced, no sludge is generated, and the cost is not needed. The main equipment of the system is a container and a pump, and only a slurry pump is needed for routine maintenance. The method has low energy consumption and low operation cost, and realizes the reduction and even zero discharge of the desulfurization wastewater. The system is simple, the maintenance amount is small, and the automation degree is high. Through the evaporation treatment of the desulfurization wastewater, the maximum wastewater recovery rate can reach 95%, the concentration is continuously and automatically adjusted to 50% -95%, and after flash evaporation, the water evaporated and condensed from the desulfurization wastewater belongs to distilled product water and can be used for boiler water supplement. High recovery rate of wastewater, excellent quality of recovered water and capability of realizing the reduction treatment of wastewater. The waste heat can be recovered, the recovered water is condensed by flash steam, and the heat for cooling in the condensation process can be used for supplying heat or bathing water, so that the full utilization of the waste heat is realized. The decrement zero emission treatment of the system is better realized.

Description of the drawings:

fig. 1 is a system diagram of the present invention.

The specific implementation mode is as follows:

example 1: as shown in fig. 1, a desulfurization wastewater reduction system with two-effect flash evaporation comprises a feed pump 1, a one-effect flash evaporator 2, a one-effect evaporation circulating pump 3, a one-effect heat exchanger 4, a two-effect flash evaporator 5, a two-effect heat exchanger 6, a two-effect evaporation circulating pump 7, a condenser 8, a sedimentation tank 9, a discharge pump 10, a condensate tank 11 and a reuse water pump 12; a material outlet of a feed pump 1 is communicated with a material inlet of a primary-effect flash evaporator 2, and a gas outlet of the primary-effect flash evaporator 2 is communicated with a shell pass inlet of a secondary-effect heat exchanger 6; the discharge hole of the first-effect flash evaporator 2 is respectively communicated with the feed hole of the first-effect evaporation circulating pump 3 and the feed hole of the second-effect flash evaporator 5, and the discharge hole of the first-effect evaporation circulating pump 3 is communicated with the tube pass inlet of the first-effect heat exchanger 4; the tube pass outlet of the first-effect heat exchanger 4 is communicated with the air inlet of the first-effect flash evaporator 2; the shell pass inlet of the primary heat exchanger 4 is communicated with a steam gas source; an air outlet of the double-effect flash evaporator 5 is communicated with an air inlet of a condenser 8, and a water inlet of the condenser 8 is communicated with a cooling water source; a discharge hole of the two-effect flash evaporator 5 is respectively communicated with a feed hole of a two-effect evaporation circulating pump 7 and a sedimentation tank 9, an inlet of a discharge pump 10 is communicated with the sedimentation tank 9, and a discharge hole of the two-effect evaporation circulating pump 7 is communicated with a tube pass inlet of the two-effect heat exchanger 6; a tube pass outlet of the double-effect heat exchanger 6 is communicated with an air inlet of the double-effect flash evaporator 5; the shell pass outlet of the first-effect heat exchanger 4, the water outlet of the condenser 8 and the shell pass outlet of the second-effect heat exchanger 6 are communicated with the condensate water tank 11, the inlet of the reuse water pump 12 is communicated with the condensate water tank 11, and the first-effect heat exchanger 4 and the second-effect heat exchanger 6 are both shell-and-tube heat exchangers.

The working principle is as follows: after the water quality of the inlet water of the desulfurization wastewater system is uniform, the inlet water passes through a feed pump 1 to a first-effect flash evaporator 2 and is treated by the first-effect flash evaporator 2, part of the inlet water passes through a first-effect evaporation circulating pump 3 to supply water to a first-effect heat exchanger 4, auxiliary steam header steam is required to be adopted as a main heat source for the first-effect heat exchanger 4, stable and continuous low-temperature saturated steam generated by a heat source conversion system enters the first-effect heat exchanger 4 to heat the wastewater, and a steam condensate part returns to the heat source conversion system for recycling; meanwhile, the primary heat exchanger 4 stably and continuously enters the primary flash evaporator 2 through low-temperature saturated steam, and condensed water of the primary heat exchanger 4 finally flows into the condensed water tank 11.

One effect flash vessel 2 is gone to two effect flash vessel 5 all the way, handles through two effect flash vessel 5, and the part is through two effect evaporation circulating pump 7 with water source to two effect heat exchanger 6, and two effect heat exchanger 6 needs to adopt one effect flash vessel 2 steam as main heat source, and the heat source conversion system produces stable continuous low temperature saturated steam and gets into two effect flash vessel 5 and heat waste water, and steam condensate part gets into condenser 8, and 6 comdenstion water of two effect heat exchanger finally flow into condensate tank 11.

The outlet of the two-effect flash evaporator 5 is provided with a sedimentation tank 9 and a discharge pump 10, wastewater is continued to a subsequent process needing to be set, wherein a condensate tank 11 and a condensate recovery water pump 12 are arranged for the one-effect heat exchanger 4 and the two-effect heat exchanger 6, condensate generated by the system is recovered in the condensate tank 11, and the condensate is recovered to other process water tanks for recycling through the condensate recovery water pump 12.

Claims (2)

1. A desulfurization wastewater decrement system with double-effect flash evaporation is characterized by comprising a feeding pump, a first-effect flash evaporator, a first-effect evaporation circulating pump, a first-effect heat exchanger, a second-effect flash evaporator, a second-effect heat exchanger, a second-effect evaporation circulating pump, a condenser, a condensate tank and a reuse water pump; the discharge port of the feeding pump is communicated with the feed port of the primary-effect flash evaporator, and the air outlet of the primary-effect flash evaporator is communicated with the shell pass inlet of the secondary-effect heat exchanger; the discharge hole of the primary-effect flash evaporator is respectively communicated with the feed inlet of the primary-effect evaporation circulating pump and the feed inlet of the secondary-effect flash evaporator, and the discharge hole of the primary-effect evaporation circulating pump is communicated with the tube pass inlet of the primary-effect heat exchanger; a tube pass outlet of the primary-effect heat exchanger is communicated with an air inlet of the primary-effect flash evaporator; the shell pass inlet of the primary heat exchanger is communicated with a steam gas source; the air outlet of the double-effect flash evaporator is communicated with the air inlet of the condenser, and the water inlet of the condenser is communicated with a cooling water source; the discharge hole of the double-effect flash evaporator is respectively communicated with the feed inlet of the double-effect evaporation circulating pump and the sedimentation tank, the inlet of a discharge pump is communicated with the sedimentation tank, and the discharge hole of the double-effect evaporation circulating pump is communicated with the tube pass inlet of the double-effect heat exchanger; a tube pass outlet of the double-effect heat exchanger is communicated with an air inlet of the double-effect flash evaporator; and the shell pass outlet of the first-effect heat exchanger, the water outlet of the condenser and the shell pass outlet of the second-effect heat exchanger are communicated with the condensate tank, and the inlet of the reuse water pump is communicated with the condensate tank.

2. The desulfurization wastewater abatement system of a two-effect flash distillation of claim 1, wherein both the first-effect heat exchanger and the second-effect heat exchanger are shell-and-tube heat exchangers.

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